[PATCH v2 0/5] Extended xstats API in ethdev library to allow grouping of stats

[PATCH v2 0/5] Extended xstats API in ethdev library to allow grouping of stats

[Michal Jastrzebski]

Extended xstats API in ethdev library to allow grouping of stats logically
so they can be retrieved per logical grouping – managed by the application.
Changed existing functions rte_eth_xstats_get_names and rte_eth_xstats_get
to use a new list of arguments: array of ids and array of values.
ABI versioning mechanism was used to support backward compatibility.
Introduced two new functions rte_eth_xstats_get_all and
rte_eth_xstats_get_names_all which keeps functionality of the previous
ones (respectively rte_eth_xstats_get and rte_eth_xstats_get_names)
but use new API inside. Both functions marked as deprecated. 
Introduced new function: rte_eth_xstats_get_id_by_name to retrieve
xstats ids by its names.
Extended functionality of proc_info application:
--xstats-name NAME: to display single xstat value by NAME
Updated test-pmd application to use new API.

v2 changes:
replaced grouping mechanism to use mechanism based on IDs

Jacek Piasecki (5):
  add new xstats API retrieving by id
  add new xstats API id support for e1000
  add new xstats API id support for ixgbe
  add support for new xstats API retrieving by id
  add support for new xstats API retrieving by id

 app/proc_info/main.c                   |  56 ++++-
 app/test-pmd/config.c                  |  18 +-
 drivers/net/e1000/igb_ethdev.c         |  92 ++++++-
 drivers/net/ixgbe/ixgbe_ethdev.c       | 178 ++++++++++++++
 lib/librte_ether/Makefile              |   2 +-
 lib/librte_ether/rte_ethdev.c          | 435 +++++++++++++++++++++++++--------
 lib/librte_ether/rte_ethdev.h          | 168 ++++++++++++-
 lib/librte_ether/rte_ether_version.map |  12 +
 8 files changed, 824 insertions(+), 137 deletions(-)

-- 
1.9.1

[PATCH v2 1/5] add new xstats API retrieving by id

[Michal Jastrzebski]

Extended xstats API in ethdev library to allow grouping of stats
logically so they can be retrieved per logical grouping – managed
by the application.
Changed existing functions rte_eth_xstats_get_names and
rte_eth_xstats_get to use a new list of arguments: array of ids
and array of values. ABI versioning mechanism was used to
support backward compatibility.
Introduced two new functions rte_eth_xstats_get_all and
rte_eth_xstats_get_names_all which keeps functionality of the
previous ones (respectively rte_eth_xstats_get and
rte_eth_xstats_get_names) but use new API inside.
Both functions marked as deprecated. 
Introduced new function: rte_eth_xstats_get_id_by_name
to retrieve xstats ids by its names.

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 lib/librte_ether/Makefile              |   2 +-
 lib/librte_ether/rte_ethdev.c          | 435 +++++++++++++++++++++++++--------
 lib/librte_ether/rte_ethdev.h          | 168 ++++++++++++-
 lib/librte_ether/rte_ether_version.map |  12 +
 4 files changed, 502 insertions(+), 115 deletions(-)

diff --git a/lib/librte_ether/Makefile b/lib/librte_ether/Makefile
index 066114b..5bbf721 100644
--- a/lib/librte_ether/Makefile
+++ b/lib/librte_ether/Makefile
@@ -41,7 +41,7 @@ CFLAGS += $(WERROR_FLAGS)
 
 EXPORT_MAP := rte_ether_version.map
 
-LIBABIVER := 6
+LIBABIVER := 7
 
 SRCS-y += rte_ethdev.c
 SRCS-y += rte_flow.c
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index b796e7d..d61c3ff 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1449,7 +1449,7 @@ struct rte_eth_dev *
 	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
 	dev = &rte_eth_devices[port_id];
 	if (dev->dev_ops->xstats_get_names != NULL) {
-		count = (*dev->dev_ops->xstats_get_names)(dev, NULL, 0);
+		count = (*dev->dev_ops->xstats_get_names_by_ids)(dev, NULL, NULL, 0);
 		if (count < 0)
 			return count;
 	} else
@@ -1463,150 +1463,375 @@ struct rte_eth_dev *
 }
 
 int
-rte_eth_xstats_get_names(uint8_t port_id,
-	struct rte_eth_xstat_name *xstats_names,
-	unsigned size)
+rte_eth_xstats_get_id_by_name(uint8_t port_id, const char *xstat_name,
+		uint64_t *id)
 {
-	struct rte_eth_dev *dev;
-	int cnt_used_entries;
-	int cnt_expected_entries;
-	int cnt_driver_entries;
-	uint32_t idx, id_queue;
-	uint16_t num_q;
+	uint64_t *values;
+	int cnt_xstats, idx_xstat;
+	struct rte_eth_xstat_name *xstats_names;
 
-	cnt_expected_entries = get_xstats_count(port_id);
-	if (xstats_names == NULL || cnt_expected_entries < 0 ||
-			(int)size < cnt_expected_entries)
-		return cnt_expected_entries;
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
 
-	/* port_id checked in get_xstats_count() */
-	dev = &rte_eth_devices[port_id];
-	cnt_used_entries = 0;
+	if (!id) {
+		RTE_PMD_DEBUG_TRACE("Error: id pointer is NULL\n");
+		return -1;
+	}
 
-	for (idx = 0; idx < RTE_NB_STATS; idx++) {
-		snprintf(xstats_names[cnt_used_entries].name,
-			sizeof(xstats_names[0].name),
-			"%s", rte_stats_strings[idx].name);
-		cnt_used_entries++;
+	if (!xstat_name) {
+		RTE_PMD_DEBUG_TRACE("Error: xstat_name pointer is NULL\n");
+		return -1;
+	}
+
+	/* Get count */
+	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, NULL, 0);
+	if (cnt_xstats  < 0) {
+		RTE_PMD_DEBUG_TRACE("Error: Cannot get count of xstats\n");
+		return -1;
+	}
+
+	/* Get id-name lookup table */
+	xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * cnt_xstats);
+	if (xstats_names == NULL) {
+		RTE_PMD_DEBUG_TRACE("Cannot allocate memory"
+				"for xstats lookup\n");
+		return -1;
+	}
+	if (cnt_xstats != rte_eth_xstats_get_names(
+			port_id, xstats_names, NULL, cnt_xstats)) {
+		RTE_PMD_DEBUG_TRACE("Error: Cannot get xstats lookup\n");
+		free(xstats_names);
+		return -1;
+	}
+
+	/* Get stats themselves */
+	values = malloc(sizeof(values) * cnt_xstats);
+	if (values == NULL) {
+		RTE_PMD_DEBUG_TRACE("Cannot allocate memory for xstats\n");
+		free(xstats_names);
+		return -1;
+	}
+
+	if (cnt_xstats != rte_eth_xstats_get(port_id, NULL,
+			values, cnt_xstats)) {
+		RTE_PMD_DEBUG_TRACE("Error: Unable to get xstats\n");
+		free(xstats_names);
+		free(values);
+		return -1;
 	}
-	num_q = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	for (id_queue = 0; id_queue < num_q; id_queue++) {
-		for (idx = 0; idx < RTE_NB_RXQ_STATS; idx++) {
-			snprintf(xstats_names[cnt_used_entries].name,
-				sizeof(xstats_names[0].name),
-				"rx_q%u%s",
-				id_queue, rte_rxq_stats_strings[idx].name);
-			cnt_used_entries++;
-		}
 
+	/* Display xstats */
+	for (idx_xstat = 0; idx_xstat < cnt_xstats; idx_xstat++) {
+		if (!strcmp(xstats_names[idx_xstat].name, xstat_name)) {
+			*id = idx_xstat;
+			free(xstats_names);
+			free(values);
+			return 0;
+		};
 	}
-	num_q = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	for (id_queue = 0; id_queue < num_q; id_queue++) {
-		for (idx = 0; idx < RTE_NB_TXQ_STATS; idx++) {
+
+	free(xstats_names);
+	free(values);
+	return -EINVAL;
+}
+
+int
+rte_eth_xstats_get_names_v1705(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+	unsigned int size)
+{
+	/* Get all xstats */
+	if (!ids) {
+		struct rte_eth_dev *dev;
+		int cnt_used_entries;
+		int cnt_expected_entries;
+		int cnt_driver_entries;
+		uint32_t idx, id_queue;
+		uint16_t num_q;
+
+		cnt_expected_entries = get_xstats_count(port_id);
+		if (xstats_names == NULL || cnt_expected_entries < 0 ||
+				(int)size < cnt_expected_entries)
+			return cnt_expected_entries;
+
+		/* port_id checked in get_xstats_count() */
+		dev = &rte_eth_devices[port_id];
+		cnt_used_entries = 0;
+
+		for (idx = 0; idx < RTE_NB_STATS; idx++) {
 			snprintf(xstats_names[cnt_used_entries].name,
 				sizeof(xstats_names[0].name),
-				"tx_q%u%s",
-				id_queue, rte_txq_stats_strings[idx].name);
+				"%s", rte_stats_strings[idx].name);
 			cnt_used_entries++;
 		}
+		num_q = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		for (id_queue = 0; id_queue < num_q; id_queue++) {
+			for (idx = 0; idx < RTE_NB_RXQ_STATS; idx++) {
+				snprintf(xstats_names[cnt_used_entries].name,
+					sizeof(xstats_names[0].name),
+					"rx_q%u%s",
+					id_queue, rte_rxq_stats_strings[idx].name);
+				cnt_used_entries++;
+			}
+
+		}
+		num_q = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		for (id_queue = 0; id_queue < num_q; id_queue++) {
+			for (idx = 0; idx < RTE_NB_TXQ_STATS; idx++) {
+				snprintf(xstats_names[cnt_used_entries].name,
+					sizeof(xstats_names[0].name),
+					"tx_q%u%s",
+					id_queue, rte_txq_stats_strings[idx].name);
+				cnt_used_entries++;
+			}
+		}
+
+		if (dev->dev_ops->xstats_get_names_by_ids != NULL) {
+			/* If there are any driver-specific xstats, append them
+			 * to end of list.
+			 */
+			cnt_driver_entries = (*dev->dev_ops->xstats_get_names_by_ids)(
+				dev,
+				xstats_names + cnt_used_entries,
+				NULL,
+				size - cnt_used_entries);
+			if (cnt_driver_entries < 0)
+				return cnt_driver_entries;
+			cnt_used_entries += cnt_driver_entries;
+
+		} else if (dev->dev_ops->xstats_get_names != NULL) {
+			/* If there are any driver-specific xstats, append them
+			 * to end of list.
+			 */
+			cnt_driver_entries = (*dev->dev_ops->xstats_get_names)(
+				dev,
+				xstats_names + cnt_used_entries,
+				size - cnt_used_entries);
+			if (cnt_driver_entries < 0)
+				return cnt_driver_entries;
+			cnt_used_entries += cnt_driver_entries;
+		}
+
+		return cnt_used_entries;
 	}
+	/* Get only xstats given by IDS */
+	else {
+		uint16_t len, i;
+		struct rte_eth_xstat_name *xstats_names_copy;
 
-	if (dev->dev_ops->xstats_get_names != NULL) {
-		/* If there are any driver-specific xstats, append them
-		 * to end of list.
-		 */
-		cnt_driver_entries = (*dev->dev_ops->xstats_get_names)(
-			dev,
-			xstats_names + cnt_used_entries,
-			size - cnt_used_entries);
-		if (cnt_driver_entries < 0)
-			return cnt_driver_entries;
-		cnt_used_entries += cnt_driver_entries;
+		len = rte_eth_xstats_get_names_v1705(port_id, NULL, NULL, 0);
+
+		xstats_names_copy = malloc(sizeof(struct rte_eth_xstat_name) * len);
+		if (!xstats_names_copy) {
+			RTE_PMD_DEBUG_TRACE("ERROR: can't allocate memory "
+					"for values_copy \n");
+			free(xstats_names_copy);
+			return -1;
+		}
+
+		rte_eth_xstats_get_names_v1705(port_id, xstats_names_copy,
+				NULL, len);
+
+		for (i = 0; i < size; i++) {
+			if (ids[i] >= len) {
+				RTE_PMD_DEBUG_TRACE("ERROR: id value"
+						"isn't valid \n");
+				return -1;
+			}
+			strcpy(xstats_names[i].name, xstats_names_copy[ids[i]].name);
+		}
+		free(xstats_names_copy);
+		return size;
 	}
+}
+MAP_STATIC_SYMBOL(int
+		rte_eth_xstats_get_names(uint8_t port_id,
+			struct rte_eth_xstat_name *xstats_names,
+			uint64_t *ids,
+			unsigned size), rte_eth_xstats_get_names_v1705);
 
-	return cnt_used_entries;
+int
+rte_eth_xstats_get_names_v1702(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names,
+	unsigned int size)
+{
+	return rte_eth_xstats_get_names(port_id, xstats_names, NULL, size);
 }
+VERSION_SYMBOL(rte_eth_xstats_get_names, _v1702, 17.02);
 
 /* retrieve ethdev extended statistics */
 int
-rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
-	unsigned n)
+rte_eth_xstats_get_v1702(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n)
 {
-	struct rte_eth_stats eth_stats;
-	struct rte_eth_dev *dev;
-	unsigned count = 0, i, q;
-	signed xcount = 0;
-	uint64_t val, *stats_ptr;
-	uint16_t nb_rxqs, nb_txqs;
+	uint64_t *values_copy;
+	uint16_t size,i;
 
-	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
+	values_copy = malloc(sizeof(values_copy) * n);
+	if (!values_copy) {
+		RTE_PMD_DEBUG_TRACE("ERROR: Cannot allocate memory"
+				"for xstats \n");
+		return -1;
+	}
+	size = rte_eth_xstats_get(port_id, 0, values_copy, n);
 
-	dev = &rte_eth_devices[port_id];
+	for (i = 0; i < n; i++) {
+		xstats[i].id = i;
+		xstats[i].value = values_copy[i];
+	}
+	free(values_copy);
+	return size;
+}
+VERSION_SYMBOL(rte_eth_xstats_get, _v1702, 17.02);
 
-	nb_rxqs = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	nb_txqs = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
+/* retrieve ethdev extended statistics */
+int
+rte_eth_xstats_get_v1705(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n)
+{
+	/* If need all xstats */
+	if (!ids) {
+		struct rte_eth_stats eth_stats;
+		struct rte_eth_dev *dev;
+		unsigned count = 0, i, q;
+		signed xcount = 0;
+		uint64_t val, *stats_ptr;
+		uint16_t nb_rxqs, nb_txqs;
 
-	/* Return generic statistics */
-	count = RTE_NB_STATS + (nb_rxqs * RTE_NB_RXQ_STATS) +
-		(nb_txqs * RTE_NB_TXQ_STATS);
+		RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+		dev = &rte_eth_devices[port_id];
 
-	/* implemented by the driver */
-	if (dev->dev_ops->xstats_get != NULL) {
-		/* Retrieve the xstats from the driver at the end of the
-		 * xstats struct.
-		 */
-		xcount = (*dev->dev_ops->xstats_get)(dev,
-				     xstats ? xstats + count : NULL,
-				     (n > count) ? n - count : 0);
+		nb_rxqs = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		nb_txqs = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
 
-		if (xcount < 0)
-			return xcount;
-	}
+		/* Return generic statistics */
+		count = RTE_NB_STATS + (nb_rxqs * RTE_NB_RXQ_STATS) +
+			(nb_txqs * RTE_NB_TXQ_STATS);
 
-	if (n < count + xcount || xstats == NULL)
-		return count + xcount;
 
-	/* now fill the xstats structure */
-	count = 0;
-	rte_eth_stats_get(port_id, &eth_stats);
+		/* implemented by the driver */
+		if (dev->dev_ops->xstats_get_by_ids != NULL) {
+			/* Retrieve the xstats from the driver at the end of the
+			 * xstats struct. Retrieve all xstats.
+			 */
+			xcount = (*dev->dev_ops->xstats_get_by_ids)(dev,
+					NULL,
+					values ? values + count : NULL,
+					(n > count) ? n - count : 0);
+
+			if (xcount < 0)
+				return xcount;
+		/* implemented by the driver */
+		} else if (dev->dev_ops->xstats_get != NULL) {
+			/* Retrieve the xstats from the driver at the end of the
+			 * xstats struct. Retrieve all xstats.
+			 * Backward compatibility for PMD without xstats_get_by_ids
+			 */
+			xcount = (*dev->dev_ops->xstats_get)(dev, NULL, 0);
+
+			if (xcount < 0)
+				return xcount;
+		}
 
-	/* global stats */
-	for (i = 0; i < RTE_NB_STATS; i++) {
-		stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_stats_strings[i].offset);
-		val = *stats_ptr;
-		xstats[count++].value = val;
-	}
+		if (n < count + xcount || values == NULL) {
+			return count + xcount;
+		}
+
+		/* now fill the xstats structure */
+		count = 0;
+		rte_eth_stats_get(port_id, &eth_stats);
 
-	/* per-rxq stats */
-	for (q = 0; q < nb_rxqs; q++) {
-		for (i = 0; i < RTE_NB_RXQ_STATS; i++) {
+		/* global stats */
+		for (i = 0; i < RTE_NB_STATS; i++) {
 			stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_rxq_stats_strings[i].offset +
-					q * sizeof(uint64_t));
+						rte_stats_strings[i].offset);
 			val = *stats_ptr;
-			xstats[count++].value = val;
+			values[count++] = val;
+		}
+
+		/* per-rxq stats */
+		for (q = 0; q < nb_rxqs; q++) {
+			for (i = 0; i < RTE_NB_RXQ_STATS; i++) {
+				stats_ptr = RTE_PTR_ADD(&eth_stats,
+						rte_rxq_stats_strings[i].offset +
+						q * sizeof(uint64_t));
+				val = *stats_ptr;
+				values[count++] = val;
+			}
+		}
+
+		/* per-txq stats */
+		for (q = 0; q < nb_txqs; q++) {
+			for (i = 0; i < RTE_NB_TXQ_STATS; i++) {
+				stats_ptr = RTE_PTR_ADD(&eth_stats,
+						rte_txq_stats_strings[i].offset +
+						q * sizeof(uint64_t));
+				val = *stats_ptr;
+				values[count++] = val;
+			}
 		}
+
+		return count + xcount;
 	}
+	/* Need only xstats given by IDS array */
+	else {
+		uint16_t i, size;
+		uint64_t *values_copy;
 
-	/* per-txq stats */
-	for (q = 0; q < nb_txqs; q++) {
-		for (i = 0; i < RTE_NB_TXQ_STATS; i++) {
-			stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_txq_stats_strings[i].offset +
-					q * sizeof(uint64_t));
-			val = *stats_ptr;
-			xstats[count++].value = val;
+		size = rte_eth_xstats_get_v1705(port_id, NULL, NULL, 0);
+
+		values_copy = malloc(sizeof(values_copy) * size);
+		if (!values_copy) {
+			RTE_PMD_DEBUG_TRACE("ERROR: can't allocate memory "
+						"for values_copy \n");
+			return -1;
 		}
+
+		rte_eth_xstats_get_v1705(port_id, NULL, values_copy, size);
+
+		for (i = 0; i < n; i++) {
+			if (ids[i] >= size) {
+				RTE_PMD_DEBUG_TRACE("ERROR: id value"
+							"isn't valid \n");
+				return -1;
+			}
+			values[i] = values_copy[ids[i]];
+		}
+		free(values_copy);
+		return n;
+	}
+}
+MAP_STATIC_SYMBOL(int
+		rte_eth_xstats_get(uint8_t port_id, uint64_t *ids,
+		uint64_t *values, unsigned int n), rte_eth_xstats_get_v1705);
+
+__rte_deprecated int
+rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n)
+{
+	uint64_t *values_copy;
+	uint16_t size, i;
+
+	values_copy = malloc(sizeof(values_copy) * n);
+	if (!values_copy) {
+		RTE_PMD_DEBUG_TRACE("ERROR: Cannot allocate memory"
+				"for xstats \n");
+		return -1;
 	}
+	size = rte_eth_xstats_get(port_id, 0, values_copy, n);
 
-	for (i = 0; i < count; i++)
+	for (i = 0; i < n; i++) {
 		xstats[i].id = i;
-	/* add an offset to driver-specific stats */
-	for ( ; i < count + xcount; i++)
-		xstats[i].id += count;
+		xstats[i].value = values_copy[i];
+	}
+	free(values_copy);
+	return size;
+}
 
-	return count + xcount;
+__rte_deprecated int
+rte_eth_xstats_get_names_all(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n)
+{
+	return rte_eth_xstats_get_names(port_id, xstats_names, NULL, n);
 }
 
 /* reset ethdev extended statistics */
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index b3ee872..083cd10 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -186,6 +186,7 @@
 #include "rte_ether.h"
 #include "rte_eth_ctrl.h"
 #include "rte_dev_info.h"
+#include "rte_compat.h"
 
 struct rte_mbuf;
 
@@ -1118,6 +1119,10 @@ typedef int (*eth_xstats_get_t)(struct rte_eth_dev *dev,
 	struct rte_eth_xstat *stats, unsigned n);
 /**< @internal Get extended stats of an Ethernet device. */
 
+typedef int (*eth_xstats_get_by_ids_t)(struct rte_eth_dev *dev,
+		uint64_t *ids, uint64_t *values, unsigned n);
+/**< @internal Get extended stats of an Ethernet device. */
+
 typedef void (*eth_xstats_reset_t)(struct rte_eth_dev *dev);
 /**< @internal Reset extended stats of an Ethernet device. */
 
@@ -1125,6 +1130,16 @@ typedef int (*eth_xstats_get_names_t)(struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, unsigned size);
 /**< @internal Get names of extended stats of an Ethernet device. */
 
+typedef int (*eth_xstats_get_names_by_ids_t)(struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names, uint64_t *ids, unsigned size);
+/**< @internal Get names of extended stats of an Ethernet device. */
+
+typedef int (*eth_xstats_get_by_name_t)(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names,
+		struct rte_eth_xstat *xstat,
+		const char *name);
+/**< @internal Get xstat specified by name of an Ethernet device. */
+
 typedef int (*eth_queue_stats_mapping_set_t)(struct rte_eth_dev *dev,
 					     uint16_t queue_id,
 					     uint8_t stat_idx,
@@ -1459,9 +1474,11 @@ struct eth_dev_ops {
 	eth_stats_get_t            stats_get;     /**< Get generic device statistics. */
 	eth_stats_reset_t          stats_reset;   /**< Reset generic device statistics. */
 	eth_xstats_get_t           xstats_get;    /**< Get extended device statistics. */
+	eth_xstats_get_by_ids_t    xstats_get_by_ids;    /**< Get extended device statistics by ID. */
 	eth_xstats_reset_t         xstats_reset;  /**< Reset extended device statistics. */
-	eth_xstats_get_names_t     xstats_get_names;
-	/**< Get names of extended statistics. */
+	eth_xstats_get_names_t	   xstats_get_names;	/**< Get names of extended device statistics. */
+	eth_xstats_get_names_by_ids_t xstats_get_names_by_ids;	/**< Get name of extended device statistics by ID. */
+	eth_xstats_get_by_name_t   xstats_get_by_name;	/**< Get extended device statistics by name. */
 	eth_queue_stats_mapping_set_t queue_stats_mapping_set;
 	/**< Configure per queue stat counter mapping. */
 
@@ -2287,8 +2304,56 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  */
 void rte_eth_stats_reset(uint8_t port_id);
 
+
 /**
- * Retrieve names of extended statistics of an Ethernet device.
+* Gets the ID of a statistic from its name.
+*
+* Note this function searches for the statistics using string compares, and
+* as such should not be used on the fast-path. For fast-path retrieval of
+* specific statistics, store the ID as provided in *id* from this function,
+* and pass the ID to rte_eth_xstats_get()
+*
+* @param port_id The port to look up statistics from
+* @param xstat_name The name of the statistic to return
+* @param[out] id A pointer to an app-supplied uint64_t which should be
+*                set to the ID of the stat if the stat exists.
+* @return
+*    0 on success
+*    -ENODEV for invalid port_id,
+*    -EINVAL if the xstat_name doesn't exist in port_id
+*/
+int rte_eth_xstats_get_id_by_name(uint8_t port_id, const char *xstat_name,
+		uint64_t *id);
+
+/**
+ * Retrieve all extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats
+ *   A pointer to a table of structure of type *rte_eth_xstat*
+ *   to be filled with device statistics ids and values: id is the
+ *   index of the name string in xstats_names (see rte_eth_xstats_get_names()),
+ *   and value is the statistic counter.
+ *   This parameter can be set to NULL if n is 0.
+ * @param n
+ *   The size of the xstats array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+__rte_deprecated int rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned n);
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get_all, _v1705, 17.05);
+
+
+/**
+ * Retrieve names of all extended statistics of an Ethernet device.
  *
  * @param port_id
  *   The port identifier of the Ethernet device.
@@ -2296,7 +2361,7 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  *   An rte_eth_xstat_name array of at least *size* elements to
  *   be filled. If set to NULL, the function returns the required number
  *   of elements.
- * @param size
+ * @param n
  *   The size of the xstats_names array (number of elements).
  * @return
  *   - A positive value lower or equal to size: success. The return value
@@ -2307,9 +2372,10 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  *     shall not be used by the caller.
  *   - A negative value on error (invalid port id).
  */
-int rte_eth_xstats_get_names(uint8_t port_id,
-		struct rte_eth_xstat_name *xstats_names,
-		unsigned size);
+__rte_deprecated int rte_eth_xstats_get_names_all(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n);
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get_names_all, _v1705, 17.05);
+
 
 /**
  * Retrieve extended statistics of an Ethernet device.
@@ -2333,8 +2399,92 @@ int rte_eth_xstats_get_names(uint8_t port_id,
  *     shall not be used by the caller.
  *   - A negative value on error (invalid port id).
  */
-int rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
-		unsigned n);
+int rte_eth_xstats_get_v1702(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n);
+
+/**
+ * Retrieve extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param ids
+ *   A pointer to an ids array passed by application. This tells wich
+ *   statistics values function should retrieve. This parameter
+ *   can be set to NULL if n is 0. In this case function will retrieve
+ *   all avalible statistics.
+ * @param values
+ *   A pointer to a table to be filled with device statistics values.
+ * @param n
+ *   The size of the ids array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_v1705(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n);
+
+int rte_eth_xstats_get(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n);
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get, _v1705, 17.05);
+
+/**
+ * Retrieve extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats
+ *   A pointer to a table of structure of type *rte_eth_xstat*
+ *   to be filled with device statistics ids and values: id is the
+ *   index of the name string in xstats_names (see rte_eth_xstats_get_names()),
+ *   and value is the statistic counter.
+ *   This parameter can be set to NULL if n is 0.
+ * @param n
+ *   The size of the xstats array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_names_v1702(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n);
+
+/**
+ * Retrieve names of extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats_names
+ *   An rte_eth_xstat_name array of at least *size* elements to
+ *   be filled. If set to NULL, the function returns the required number
+ *   of elements.
+ * @param size
+ *   The size of the xstats_names array (number of elements).
+ * @return
+ *   - A positive value lower or equal to size: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than size: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_names_v1705(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+	unsigned int size);
+
+int rte_eth_xstats_get_names(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+	unsigned int size);
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get_names, _v1705, 17.05);
 
 /**
  * Reset extended statistics of an Ethernet device.
diff --git a/lib/librte_ether/rte_ether_version.map b/lib/librte_ether/rte_ether_version.map
index c6c9d0d..8a1a330 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -154,3 +154,15 @@ DPDK_17.02 {
 	rte_flow_validate;
 
 } DPDK_16.11;
+
+DPDK_17.05 {
+	global:
+
+	rte_eth_xstats_get_names;
+	rte_eth_xstats_get;
+	rte_eth_xstats_get_all;
+	rte_eth_xstats_get_names_all;
+	rte_eth_xstats_get_id_by_name;
+
+} DPDK_17.02;
+
-- 
1.9.1

[PATCH v3 0/3] Extended xstats API in ethdev library to allow grouping of stats

[Jacek Piasecki]

Extended xstats API in ethdev library to allow grouping of stats logically
so they can be retrieved per logical grouping  managed by the application.
Changed existing functions rte_eth_xstats_get_names and rte_eth_xstats_get
to use a new list of arguments: array of ids and array of values.
ABI versioning mechanism was used to support backward compatibility.
Introduced two new functions rte_eth_xstats_get_all and
rte_eth_xstats_get_names_all which keeps functionality of the previous
ones (respectively rte_eth_xstats_get and rte_eth_xstats_get_names)
but use new API inside. Both functions marked as deprecated. 
Introduced new function: rte_eth_xstats_get_id_by_name to retrieve
xstats ids by its names.
Extended functionality of proc_info application:
--xstats-name NAME: to display single xstat value by NAME
Updated test-pmd application to use new API.

v3 changes:
checkpatch fixes
removed malloc bug in ethdev
add new command to proc_info and IDs parsing
merged testpmd and proc_info patch with library patch

Jacek Piasecki (3):
  add new xstats API retrieving by id
  add new xstats API id support for e1000
  add new xstats API id support for ixgbe

 app/proc_info/main.c                   | 148 +++++++++++-
 app/test-pmd/config.c                  |  19 +-
 drivers/net/e1000/igb_ethdev.c         |  92 ++++++-
 drivers/net/ixgbe/ixgbe_ethdev.c       | 179 ++++++++++++++
 lib/librte_ether/Makefile              |   2 +-
 lib/librte_ether/rte_ethdev.c          | 422 +++++++++++++++++++++++++--------
 lib/librte_ether/rte_ethdev.h          | 176 +++++++++++++-
 lib/librte_ether/rte_ether_version.map |  12 +
 8 files changed, 915 insertions(+), 135 deletions(-)

-- 
1.9.1

[PATCH v3 1/3] add new xstats API retrieving by id

[Jacek Piasecki]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset=Y, Size: 34874 bytes --]

From: Michal Jastrzebski <michalx.k.jastrzebski@intel.com>

Extended xstats API in ethdev library to allow grouping of stats
logically so they can be retrieved per logical grouping – managed
by the application.
Changed existing functions rte_eth_xstats_get_names and
rte_eth_xstats_get to use a new list of arguments: array of ids
and array of values. ABI versioning mechanism was used to
support backward compatibility.
Introduced two new functions rte_eth_xstats_get_all and
rte_eth_xstats_get_names_all which keeps functionality of the
previous ones (respectively rte_eth_xstats_get and
rte_eth_xstats_get_names) but use new API inside.
Both functions marked as deprecated.
Introduced new function: rte_eth_xstats_get_id_by_name
to retrieve xstats ids by its names.

test-pmd: add support for new xstats API retrieving by id in
testpmd application: xstats_get() and
xstats_get_names() call with modified parameters.

proc_info: add support for new xstats API retrieving by id to
proc_info application. There is a new argument --xstats-ids
in proc_info command line to retrieve statistics given by ids.
E.g. --xstats-ids="1,3,5,7,8"

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>
---
 app/proc_info/main.c                   | 148 +++++++++++-
 app/test-pmd/config.c                  |  19 +-
 lib/librte_ether/Makefile              |   2 +-
 lib/librte_ether/rte_ethdev.c          | 422 +++++++++++++++++++++++++--------
 lib/librte_ether/rte_ethdev.h          | 176 +++++++++++++-
 lib/librte_ether/rte_ether_version.map |  12 +
 6 files changed, 646 insertions(+), 133 deletions(-)

diff --git a/app/proc_info/main.c b/app/proc_info/main.c
index ef2098d..3c9fe4a 100644
--- a/app/proc_info/main.c
+++ b/app/proc_info/main.c
@@ -83,6 +83,14 @@
 static uint32_t reset_xstats;
 /**< Enable memory info. */
 static uint32_t mem_info;
+/**< Enable displaying xstat name. */
+static uint32_t enable_xstats_name;
+static char *xstats_name;
+
+/**< Enable xstats by ids. */
+#define MAX_NB_XSTATS_IDS 1024
+static uint32_t nb_xstats_ids;
+static uint64_t xstats_ids[MAX_NB_XSTATS_IDS];
 
 /**< display usage */
 static void
@@ -94,6 +102,9 @@
 		"  --stats: to display port statistics, enabled by default\n"
 		"  --xstats: to display extended port statistics, disabled by "
 			"default\n"
+		"  --xstats-name NAME: to display single xstat value by NAME\n"
+		"  --xstats-ids IDLIST: to display xstat values by id. "
+			"The argument is comma-separated list of xstat ids to print out.\n"
 		"  --stats-reset: to reset port statistics\n"
 		"  --xstats-reset: to reset port extended statistics\n"
 		"  --collectd-format: to print statistics to STDOUT in expected by collectd format\n"
@@ -127,6 +138,33 @@
 
 }
 
+/*
+ * Parse ids value list into array
+ */
+static int
+parse_xstats_ids(char *list, uint64_t *ids, int limit) {
+	int length;
+	char *token;
+	char *ctx = NULL;
+	char *endptr;
+
+	length = 0;
+	token = strtok_r(list, ",", &ctx);
+	while (token != NULL) {
+		ids[length] = strtoull(token, &endptr, 10);
+		if (*endptr != '\0')
+			return -EINVAL;
+
+		length++;
+		if (length >= limit)
+			return -E2BIG;
+
+		token = strtok_r(NULL, ",", &ctx);
+	}
+
+	return length;
+}
+
 static int
 proc_info_preparse_args(int argc, char **argv)
 {
@@ -172,7 +210,9 @@
 		{"stats-reset", 0, NULL, 0},
 		{"xstats", 0, NULL, 0},
 		{"xstats-reset", 0, NULL, 0},
+		{"xstats-name", required_argument, NULL, 1},
 		{"collectd-format", 0, NULL, 0},
+		{"xstats-ids", 1, NULL, 1},
 		{"host-id", 0, NULL, 0},
 		{NULL, 0, 0, 0}
 	};
@@ -214,7 +254,28 @@
 					MAX_LONG_OPT_SZ))
 				reset_xstats = 1;
 			break;
+		case 1:
+			/* Print xstat single value given by name*/
+			if (!strncmp(long_option[option_index].name,
+					"xstats-name", MAX_LONG_OPT_SZ)) {
+				enable_xstats_name = 1;
+				xstats_name = optarg;
+				printf("name:%s:%s\n",
+						long_option[option_index].name,
+						optarg);
+			} else if (!strncmp(long_option[option_index].name,
+					"xstats-ids",
+					MAX_LONG_OPT_SZ))	{
+				nb_xstats_ids = parse_xstats_ids(optarg,
+						xstats_ids, MAX_NB_XSTATS_IDS);
+
+				if (nb_xstats_ids <= 0) {
+					printf("xstats-id list parse error.\n");
+					return -1;
+				}
 
+			}
+			break;
 		default:
 			proc_info_usage(prgname);
 			return -1;
@@ -341,20 +402,82 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 }
 
 static void
+nic_xstats_by_name_display(uint8_t port_id, char *name)
+{
+	uint64_t id;
+
+	printf("###### NIC statistics for port %-2d, statistic name '%s':\n",
+			   port_id, name);
+
+	if (rte_eth_xstats_get_id_by_name(port_id, name, &id) == 0)
+		printf("%s: %"PRIu64"\n", name, id);
+	else
+		printf("Statistic not found...\n");
+
+}
+
+static void
+nic_xstats_by_ids_display(uint8_t port_id, uint64_t *ids, int len)
+{
+	struct rte_eth_xstat_name *xstats_names;
+	uint64_t *values;
+	int ret, i;
+	static const char *nic_stats_border = "########################";
+
+	values = malloc(sizeof(values) * len);
+	if (values == NULL) {
+		printf("Cannot allocate memory for xstats\n");
+		return;
+	}
+
+	xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
+	if (xstats_names == NULL) {
+		printf("Cannot allocate memory for xstat names\n");
+		free(values);
+		return;
+	}
+
+	if (len != rte_eth_xstats_get_names(
+			port_id, xstats_names, ids, len)) {
+		printf("Cannot get xstat names\n");
+		goto err;
+	}
+
+	printf("###### NIC extended statistics for port %-2d #########\n",
+			   port_id);
+	printf("%s############################\n", nic_stats_border);
+	ret = rte_eth_xstats_get(port_id, ids, values, len);
+	if (ret < 0 || ret > len) {
+		printf("Cannot get xstats\n");
+		goto err;
+	}
+
+	for (i = 0; i < len; i++)
+		printf("%s: %"PRIu64"\n",
+			xstats_names[i].name,
+			values[i]);
+
+	printf("%s############################\n", nic_stats_border);
+err:
+	free(values);
+	free(xstats_names);
+}
+
+static void
 nic_xstats_display(uint8_t port_id)
 {
 	struct rte_eth_xstat_name *xstats_names;
-	struct rte_eth_xstat *xstats;
+	uint64_t *values;
 	int len, ret, i;
 	static const char *nic_stats_border = "########################";
 
-	len = rte_eth_xstats_get_names(port_id, NULL, 0);
+	len = rte_eth_xstats_get_names(port_id, NULL, NULL, 0);
 	if (len < 0) {
 		printf("Cannot get xstats count\n");
 		return;
 	}
-	xstats = malloc(sizeof(xstats[0]) * len);
-	if (xstats == NULL) {
+	values = malloc(sizeof(values) * len);
+	if (values == NULL) {
 		printf("Cannot allocate memory for xstats\n");
 		return;
 	}
@@ -362,11 +485,11 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 	xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
 	if (xstats_names == NULL) {
 		printf("Cannot allocate memory for xstat names\n");
-		free(xstats);
+		free(values);
 		return;
 	}
 	if (len != rte_eth_xstats_get_names(
-			port_id, xstats_names, len)) {
+			port_id, xstats_names, NULL, len)) {
 		printf("Cannot get xstat names\n");
 		goto err;
 	}
@@ -375,7 +498,7 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 			   port_id);
 	printf("%s############################\n",
 			   nic_stats_border);
-	ret = rte_eth_xstats_get(port_id, xstats, len);
+	ret = rte_eth_xstats_get(port_id, NULL, values, len);
 	if (ret < 0 || ret > len) {
 		printf("Cannot get xstats\n");
 		goto err;
@@ -391,18 +514,18 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 						  xstats_names[i].name);
 			sprintf(buf, "PUTVAL %s/dpdkstat-port.%u/%s-%s N:%"
 				PRIu64"\n", host_id, port_id, counter_type,
-				xstats_names[i].name, xstats[i].value);
+				xstats_names[i].name, values[i]);
 			write(stdout_fd, buf, strlen(buf));
 		} else {
 			printf("%s: %"PRIu64"\n", xstats_names[i].name,
-			       xstats[i].value);
+					values[i]);
 		}
 	}
 
 	printf("%s############################\n",
 			   nic_stats_border);
 err:
-	free(xstats);
+	free(values);
 	free(xstats_names);
 }
 
@@ -480,6 +603,11 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 				nic_stats_clear(i);
 			else if (reset_xstats)
 				nic_xstats_clear(i);
+			else if (enable_xstats_name)
+				nic_xstats_by_name_display(i, xstats_name);
+			else if (nb_xstats_ids > 0)
+				nic_xstats_by_ids_display(i, xstats_ids,
+						nb_xstats_ids);
 		}
 	}
 
diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 80491fc..c93e04a 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -264,9 +264,9 @@ struct rss_type_info {
 void
 nic_xstats_display(portid_t port_id)
 {
-	struct rte_eth_xstat *xstats;
 	int cnt_xstats, idx_xstat;
 	struct rte_eth_xstat_name *xstats_names;
+	uint64_t *values;
 
 	printf("###### NIC extended statistics for port %-2d\n", port_id);
 	if (!rte_eth_dev_is_valid_port(port_id)) {
@@ -275,7 +275,7 @@ struct rss_type_info {
 	}
 
 	/* Get count */
-	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, 0);
+	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, NULL, 0);
 	if (cnt_xstats  < 0) {
 		printf("Error: Cannot get count of xstats\n");
 		return;
@@ -288,23 +288,24 @@ struct rss_type_info {
 		return;
 	}
 	if (cnt_xstats != rte_eth_xstats_get_names(
-			port_id, xstats_names, cnt_xstats)) {
+			port_id, xstats_names, NULL, cnt_xstats)) {
 		printf("Error: Cannot get xstats lookup\n");
 		free(xstats_names);
 		return;
 	}
 
 	/* Get stats themselves */
-	xstats = malloc(sizeof(struct rte_eth_xstat) * cnt_xstats);
-	if (xstats == NULL) {
+	values = malloc(sizeof(values) * cnt_xstats);
+	if (values == NULL) {
 		printf("Cannot allocate memory for xstats\n");
 		free(xstats_names);
 		return;
 	}
-	if (cnt_xstats != rte_eth_xstats_get(port_id, xstats, cnt_xstats)) {
+	if (cnt_xstats != rte_eth_xstats_get(port_id, NULL, values,
+			cnt_xstats)) {
 		printf("Error: Unable to get xstats\n");
 		free(xstats_names);
-		free(xstats);
+		free(values);
 		return;
 	}
 
@@ -312,9 +313,9 @@ struct rss_type_info {
 	for (idx_xstat = 0; idx_xstat < cnt_xstats; idx_xstat++)
 		printf("%s: %"PRIu64"\n",
 			xstats_names[idx_xstat].name,
-			xstats[idx_xstat].value);
+			values[idx_xstat]);
 	free(xstats_names);
-	free(xstats);
+	free(values);
 }
 
 void
diff --git a/lib/librte_ether/Makefile b/lib/librte_ether/Makefile
index 066114b..5bbf721 100644
--- a/lib/librte_ether/Makefile
+++ b/lib/librte_ether/Makefile
@@ -41,7 +41,7 @@ CFLAGS += $(WERROR_FLAGS)
 
 EXPORT_MAP := rte_ether_version.map
 
-LIBABIVER := 6
+LIBABIVER := 7
 
 SRCS-y += rte_ethdev.c
 SRCS-y += rte_flow.c
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index b796e7d..91524c4 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1449,7 +1449,8 @@ struct rte_eth_dev *
 	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
 	dev = &rte_eth_devices[port_id];
 	if (dev->dev_ops->xstats_get_names != NULL) {
-		count = (*dev->dev_ops->xstats_get_names)(dev, NULL, 0);
+		count = (*dev->dev_ops->xstats_get_names_by_ids)(dev, NULL,
+				NULL, 0);
 		if (count < 0)
 			return count;
 	} else
@@ -1463,150 +1464,363 @@ struct rte_eth_dev *
 }
 
 int
-rte_eth_xstats_get_names(uint8_t port_id,
-	struct rte_eth_xstat_name *xstats_names,
-	unsigned size)
+rte_eth_xstats_get_id_by_name(uint8_t port_id, const char *xstat_name,
+		uint64_t *id)
 {
-	struct rte_eth_dev *dev;
-	int cnt_used_entries;
-	int cnt_expected_entries;
-	int cnt_driver_entries;
-	uint32_t idx, id_queue;
-	uint16_t num_q;
+	int cnt_xstats, idx_xstat;
 
-	cnt_expected_entries = get_xstats_count(port_id);
-	if (xstats_names == NULL || cnt_expected_entries < 0 ||
-			(int)size < cnt_expected_entries)
-		return cnt_expected_entries;
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
 
-	/* port_id checked in get_xstats_count() */
-	dev = &rte_eth_devices[port_id];
-	cnt_used_entries = 0;
+	if (!id) {
+		RTE_PMD_DEBUG_TRACE("Error: id pointer is NULL\n");
+		return -1;
+	}
 
-	for (idx = 0; idx < RTE_NB_STATS; idx++) {
-		snprintf(xstats_names[cnt_used_entries].name,
-			sizeof(xstats_names[0].name),
-			"%s", rte_stats_strings[idx].name);
-		cnt_used_entries++;
+	if (!xstat_name) {
+		RTE_PMD_DEBUG_TRACE("Error: xstat_name pointer is NULL\n");
+		return -1;
+	}
+
+	/* Get count */
+	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, NULL, 0);
+	if (cnt_xstats  < 0) {
+		RTE_PMD_DEBUG_TRACE("Error: Cannot get count of xstats\n");
+		return -1;
 	}
-	num_q = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	for (id_queue = 0; id_queue < num_q; id_queue++) {
-		for (idx = 0; idx < RTE_NB_RXQ_STATS; idx++) {
+
+	/* Get id-name lookup table */
+	struct rte_eth_xstat_name xstats_names[cnt_xstats];
+
+	if (cnt_xstats != rte_eth_xstats_get_names(
+			port_id, xstats_names, NULL, cnt_xstats)) {
+		RTE_PMD_DEBUG_TRACE("Error: Cannot get xstats lookup\n");
+		return -1;
+	}
+
+	for (idx_xstat = 0; idx_xstat < cnt_xstats; idx_xstat++) {
+		if (!strcmp(xstats_names[idx_xstat].name, xstat_name)) {
+			*id = idx_xstat;
+			return 0;
+		};
+	}
+
+	return -EINVAL;
+}
+
+int
+rte_eth_xstats_get_names_v1705(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+	unsigned int size)
+{
+	/* Get all xstats */
+	if (!ids) {
+		struct rte_eth_dev *dev;
+		int cnt_used_entries;
+		int cnt_expected_entries;
+		int cnt_driver_entries;
+		uint32_t idx, id_queue;
+		uint16_t num_q;
+
+		cnt_expected_entries = get_xstats_count(port_id);
+		if (xstats_names == NULL || cnt_expected_entries < 0 ||
+				(int)size < cnt_expected_entries)
+			return cnt_expected_entries;
+
+		/* port_id checked in get_xstats_count() */
+		dev = &rte_eth_devices[port_id];
+		cnt_used_entries = 0;
+
+		for (idx = 0; idx < RTE_NB_STATS; idx++) {
 			snprintf(xstats_names[cnt_used_entries].name,
 				sizeof(xstats_names[0].name),
-				"rx_q%u%s",
-				id_queue, rte_rxq_stats_strings[idx].name);
+				"%s", rte_stats_strings[idx].name);
 			cnt_used_entries++;
 		}
+		num_q = RTE_MIN(dev->data->nb_rx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		for (id_queue = 0; id_queue < num_q; id_queue++) {
+			for (idx = 0; idx < RTE_NB_RXQ_STATS; idx++) {
+				snprintf(xstats_names[cnt_used_entries].name,
+					sizeof(xstats_names[0].name),
+					"rx_q%u%s",
+					id_queue,
+					rte_rxq_stats_strings[idx].name);
+				cnt_used_entries++;
+			}
+
+		}
+		num_q = RTE_MIN(dev->data->nb_tx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		for (id_queue = 0; id_queue < num_q; id_queue++) {
+			for (idx = 0; idx < RTE_NB_TXQ_STATS; idx++) {
+				snprintf(xstats_names[cnt_used_entries].name,
+					sizeof(xstats_names[0].name),
+					"tx_q%u%s",
+					id_queue,
+					rte_txq_stats_strings[idx].name);
+				cnt_used_entries++;
+			}
+		}
 
+		if (dev->dev_ops->xstats_get_names_by_ids != NULL) {
+			/* If there are any driver-specific xstats, append them
+			 * to end of list.
+			 */
+			cnt_driver_entries =
+				(*dev->dev_ops->xstats_get_names_by_ids)(
+				dev,
+				xstats_names + cnt_used_entries,
+				NULL,
+				size - cnt_used_entries);
+			if (cnt_driver_entries < 0)
+				return cnt_driver_entries;
+			cnt_used_entries += cnt_driver_entries;
+
+		} else if (dev->dev_ops->xstats_get_names != NULL) {
+			/* If there are any driver-specific xstats, append them
+			 * to end of list.
+			 */
+			cnt_driver_entries = (*dev->dev_ops->xstats_get_names)(
+				dev,
+				xstats_names + cnt_used_entries,
+				size - cnt_used_entries);
+			if (cnt_driver_entries < 0)
+				return cnt_driver_entries;
+			cnt_used_entries += cnt_driver_entries;
+		}
+
+		return cnt_used_entries;
 	}
-	num_q = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	for (id_queue = 0; id_queue < num_q; id_queue++) {
-		for (idx = 0; idx < RTE_NB_TXQ_STATS; idx++) {
-			snprintf(xstats_names[cnt_used_entries].name,
-				sizeof(xstats_names[0].name),
-				"tx_q%u%s",
-				id_queue, rte_txq_stats_strings[idx].name);
-			cnt_used_entries++;
+	/* Get only xstats given by IDS */
+	else {
+		uint16_t len, i;
+		struct rte_eth_xstat_name *xstats_names_copy;
+
+		len = rte_eth_xstats_get_names_v1705(port_id, NULL, NULL, 0);
+
+		xstats_names_copy =
+				malloc(sizeof(struct rte_eth_xstat_name) * len);
+		if (!xstats_names_copy) {
+			RTE_PMD_DEBUG_TRACE(
+			     "ERROR: can't allocate memory for values_copy\n");
+			free(xstats_names_copy);
+			return -1;
+		}
+
+		rte_eth_xstats_get_names_v1705(port_id, xstats_names_copy,
+				NULL, len);
+
+		for (i = 0; i < size; i++) {
+			if (ids[i] >= len) {
+				RTE_PMD_DEBUG_TRACE(
+					"ERROR: id value isn't valid\n");
+				return -1;
+			}
+			strcpy(xstats_names[i].name,
+					xstats_names_copy[ids[i]].name);
 		}
+		free(xstats_names_copy);
+		return size;
 	}
+}
+MAP_STATIC_SYMBOL(int
+		rte_eth_xstats_get_names(uint8_t port_id,
+			struct rte_eth_xstat_name *xstats_names,
+			uint64_t *ids,
+			unsigned int size), rte_eth_xstats_get_names_v1705);
 
-	if (dev->dev_ops->xstats_get_names != NULL) {
-		/* If there are any driver-specific xstats, append them
-		 * to end of list.
-		 */
-		cnt_driver_entries = (*dev->dev_ops->xstats_get_names)(
-			dev,
-			xstats_names + cnt_used_entries,
-			size - cnt_used_entries);
-		if (cnt_driver_entries < 0)
-			return cnt_driver_entries;
-		cnt_used_entries += cnt_driver_entries;
+int
+rte_eth_xstats_get_names_v1702(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names,
+	unsigned int size)
+{
+	return rte_eth_xstats_get_names(port_id, xstats_names, NULL, size);
+}
+VERSION_SYMBOL(rte_eth_xstats_get_names, _v1702, 17.02);
+
+/* retrieve ethdev extended statistics */
+int
+rte_eth_xstats_get_v1702(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n)
+{
+	uint64_t *values_copy;
+	uint16_t size, i;
+
+	values_copy = malloc(sizeof(values_copy) * n);
+	if (!values_copy) {
+		RTE_PMD_DEBUG_TRACE(
+				"ERROR: Cannot allocate memory for xstats\n");
+		return -1;
 	}
+	size = rte_eth_xstats_get(port_id, 0, values_copy, n);
 
-	return cnt_used_entries;
+	for (i = 0; i < n; i++) {
+		xstats[i].id = i;
+		xstats[i].value = values_copy[i];
+	}
+	free(values_copy);
+	return size;
 }
+VERSION_SYMBOL(rte_eth_xstats_get, _v1702, 17.02);
 
 /* retrieve ethdev extended statistics */
 int
-rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
-	unsigned n)
+rte_eth_xstats_get_v1705(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n)
 {
-	struct rte_eth_stats eth_stats;
-	struct rte_eth_dev *dev;
-	unsigned count = 0, i, q;
-	signed xcount = 0;
-	uint64_t val, *stats_ptr;
-	uint16_t nb_rxqs, nb_txqs;
+	/* If need all xstats */
+	if (!ids) {
+		struct rte_eth_stats eth_stats;
+		struct rte_eth_dev *dev;
+		unsigned int count = 0, i, q;
+		signed int xcount = 0;
+		uint64_t val, *stats_ptr;
+		uint16_t nb_rxqs, nb_txqs;
 
-	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
+		RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+		dev = &rte_eth_devices[port_id];
 
-	dev = &rte_eth_devices[port_id];
+		nb_rxqs = RTE_MIN(dev->data->nb_rx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		nb_txqs = RTE_MIN(dev->data->nb_tx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
 
-	nb_rxqs = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	nb_txqs = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		/* Return generic statistics */
+		count = RTE_NB_STATS + (nb_rxqs * RTE_NB_RXQ_STATS) +
+			(nb_txqs * RTE_NB_TXQ_STATS);
 
-	/* Return generic statistics */
-	count = RTE_NB_STATS + (nb_rxqs * RTE_NB_RXQ_STATS) +
-		(nb_txqs * RTE_NB_TXQ_STATS);
 
-	/* implemented by the driver */
-	if (dev->dev_ops->xstats_get != NULL) {
-		/* Retrieve the xstats from the driver at the end of the
-		 * xstats struct.
-		 */
-		xcount = (*dev->dev_ops->xstats_get)(dev,
-				     xstats ? xstats + count : NULL,
-				     (n > count) ? n - count : 0);
+		/* implemented by the driver */
+		if (dev->dev_ops->xstats_get_by_ids != NULL) {
+			/* Retrieve the xstats from the driver at the end of the
+			 * xstats struct. Retrieve all xstats.
+			 */
+			xcount = (*dev->dev_ops->xstats_get_by_ids)(dev,
+					NULL,
+					values ? values + count : NULL,
+					(n > count) ? n - count : 0);
+
+			if (xcount < 0)
+				return xcount;
+		/* implemented by the driver */
+		} else if (dev->dev_ops->xstats_get != NULL) {
+			/* Retrieve the xstats from the driver at the end of the
+			 * xstats struct. Retrieve all xstats.
+			 * Compatibility for PMD without xstats_get_by_ids
+			 */
+			unsigned int size = (n > count) ? n - count : 1;
+			struct rte_eth_xstat xstats[size];
 
-		if (xcount < 0)
-			return xcount;
-	}
+			xcount = (*dev->dev_ops->xstats_get)(dev,
+					values ? xstats : NULL,	size);
 
-	if (n < count + xcount || xstats == NULL)
-		return count + xcount;
+			if (xcount < 0)
+				return xcount;
 
-	/* now fill the xstats structure */
-	count = 0;
-	rte_eth_stats_get(port_id, &eth_stats);
+			if (values != NULL)
+				for (i = 0 ; i < (unsigned int)xcount; i++)
+					values[i + count] = xstats[i].value;
+		}
 
-	/* global stats */
-	for (i = 0; i < RTE_NB_STATS; i++) {
-		stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_stats_strings[i].offset);
-		val = *stats_ptr;
-		xstats[count++].value = val;
-	}
+		if (n < count + xcount || values == NULL)
+			return count + xcount;
 
-	/* per-rxq stats */
-	for (q = 0; q < nb_rxqs; q++) {
-		for (i = 0; i < RTE_NB_RXQ_STATS; i++) {
+		/* now fill the xstats structure */
+		count = 0;
+		rte_eth_stats_get(port_id, &eth_stats);
+
+		/* global stats */
+		for (i = 0; i < RTE_NB_STATS; i++) {
 			stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_rxq_stats_strings[i].offset +
-					q * sizeof(uint64_t));
+						rte_stats_strings[i].offset);
 			val = *stats_ptr;
-			xstats[count++].value = val;
+			values[count++] = val;
 		}
+
+		/* per-rxq stats */
+		for (q = 0; q < nb_rxqs; q++) {
+			for (i = 0; i < RTE_NB_RXQ_STATS; i++) {
+				stats_ptr = RTE_PTR_ADD(&eth_stats,
+					    rte_rxq_stats_strings[i].offset +
+					    q * sizeof(uint64_t));
+				val = *stats_ptr;
+				values[count++] = val;
+			}
+		}
+
+		/* per-txq stats */
+		for (q = 0; q < nb_txqs; q++) {
+			for (i = 0; i < RTE_NB_TXQ_STATS; i++) {
+				stats_ptr = RTE_PTR_ADD(&eth_stats,
+					    rte_txq_stats_strings[i].offset +
+					    q * sizeof(uint64_t));
+				val = *stats_ptr;
+				values[count++] = val;
+			}
+		}
+
+		return count + xcount;
 	}
+	/* Need only xstats given by IDS array */
+	else {
+		uint16_t i, size;
+		uint64_t *values_copy;
 
-	/* per-txq stats */
-	for (q = 0; q < nb_txqs; q++) {
-		for (i = 0; i < RTE_NB_TXQ_STATS; i++) {
-			stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_txq_stats_strings[i].offset +
-					q * sizeof(uint64_t));
-			val = *stats_ptr;
-			xstats[count++].value = val;
+		size = rte_eth_xstats_get_v1705(port_id, NULL, NULL, 0);
+
+		values_copy = malloc(sizeof(values_copy) * size);
+		if (!values_copy) {
+			RTE_PMD_DEBUG_TRACE(
+			    "ERROR: can't allocate memory for values_copy\n");
+			return -1;
+		}
+
+		rte_eth_xstats_get_v1705(port_id, NULL, values_copy, size);
+
+		for (i = 0; i < n; i++) {
+			if (ids[i] >= size) {
+				RTE_PMD_DEBUG_TRACE(
+					"ERROR: id value isn't valid\n");
+				return -1;
+			}
+			values[i] = values_copy[ids[i]];
 		}
+		free(values_copy);
+		return n;
 	}
+}
+MAP_STATIC_SYMBOL(int
+		rte_eth_xstats_get(uint8_t port_id, uint64_t *ids,
+		uint64_t *values, unsigned int n), rte_eth_xstats_get_v1705);
+
+__rte_deprecated int
+rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n)
+{
+	uint64_t *values_copy;
+	uint16_t size, i;
 
-	for (i = 0; i < count; i++)
+	values_copy = malloc(sizeof(values_copy) * n);
+	if (!values_copy) {
+		RTE_PMD_DEBUG_TRACE(
+				"ERROR: Cannot allocate memory for xstats\n");
+		return -1;
+	}
+	size = rte_eth_xstats_get(port_id, 0, values_copy, n);
+
+	for (i = 0; i < n; i++) {
 		xstats[i].id = i;
-	/* add an offset to driver-specific stats */
-	for ( ; i < count + xcount; i++)
-		xstats[i].id += count;
+		xstats[i].value = values_copy[i];
+	}
+	free(values_copy);
+	return size;
+}
 
-	return count + xcount;
+__rte_deprecated int
+rte_eth_xstats_get_names_all(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n)
+{
+	return rte_eth_xstats_get_names(port_id, xstats_names, NULL, n);
 }
 
 /* reset ethdev extended statistics */
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index b3ee872..91c9af6 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -186,6 +186,7 @@
 #include "rte_ether.h"
 #include "rte_eth_ctrl.h"
 #include "rte_dev_info.h"
+#include "rte_compat.h"
 
 struct rte_mbuf;
 
@@ -1118,6 +1119,10 @@ typedef int (*eth_xstats_get_t)(struct rte_eth_dev *dev,
 	struct rte_eth_xstat *stats, unsigned n);
 /**< @internal Get extended stats of an Ethernet device. */
 
+typedef int (*eth_xstats_get_by_ids_t)(struct rte_eth_dev *dev,
+		uint64_t *ids, uint64_t *values, unsigned int n);
+/**< @internal Get extended stats of an Ethernet device. */
+
 typedef void (*eth_xstats_reset_t)(struct rte_eth_dev *dev);
 /**< @internal Reset extended stats of an Ethernet device. */
 
@@ -1125,6 +1130,17 @@ typedef int (*eth_xstats_get_names_t)(struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, unsigned size);
 /**< @internal Get names of extended stats of an Ethernet device. */
 
+typedef int (*eth_xstats_get_names_by_ids_t)(struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+	unsigned int size);
+/**< @internal Get names of extended stats of an Ethernet device. */
+
+typedef int (*eth_xstats_get_by_name_t)(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names,
+		struct rte_eth_xstat *xstat,
+		const char *name);
+/**< @internal Get xstat specified by name of an Ethernet device. */
+
 typedef int (*eth_queue_stats_mapping_set_t)(struct rte_eth_dev *dev,
 					     uint16_t queue_id,
 					     uint8_t stat_idx,
@@ -1459,9 +1475,15 @@ struct eth_dev_ops {
 	eth_stats_get_t            stats_get;     /**< Get generic device statistics. */
 	eth_stats_reset_t          stats_reset;   /**< Reset generic device statistics. */
 	eth_xstats_get_t           xstats_get;    /**< Get extended device statistics. */
+	eth_xstats_get_by_ids_t    xstats_get_by_ids;
+	/**< Get extended device statistics by ID. */
 	eth_xstats_reset_t         xstats_reset;  /**< Reset extended device statistics. */
-	eth_xstats_get_names_t     xstats_get_names;
-	/**< Get names of extended statistics. */
+	eth_xstats_get_names_t	   xstats_get_names;
+	/**< Get names of extended device statistics. */
+	eth_xstats_get_names_by_ids_t xstats_get_names_by_ids;
+	/**< Get name of extended device statistics by ID. */
+	eth_xstats_get_by_name_t   xstats_get_by_name;
+	/**< Get extended device statistics by name. */
 	eth_queue_stats_mapping_set_t queue_stats_mapping_set;
 	/**< Configure per queue stat counter mapping. */
 
@@ -2287,8 +2309,57 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  */
 void rte_eth_stats_reset(uint8_t port_id);
 
+
 /**
- * Retrieve names of extended statistics of an Ethernet device.
+* Gets the ID of a statistic from its name.
+*
+* Note this function searches for the statistics using string compares, and
+* as such should not be used on the fast-path. For fast-path retrieval of
+* specific statistics, store the ID as provided in *id* from this function,
+* and pass the ID to rte_eth_xstats_get()
+*
+* @param port_id The port to look up statistics from
+* @param xstat_name The name of the statistic to return
+* @param[out] id A pointer to an app-supplied uint64_t which should be
+*                set to the ID of the stat if the stat exists.
+* @return
+*    0 on success
+*    -ENODEV for invalid port_id,
+*    -EINVAL if the xstat_name doesn't exist in port_id
+*/
+int rte_eth_xstats_get_id_by_name(uint8_t port_id, const char *xstat_name,
+		uint64_t *id);
+
+/**
+ * Retrieve all extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats
+ *   A pointer to a table of structure of type *rte_eth_xstat*
+ *   to be filled with device statistics ids and values: id is the
+ *   index of the name string in xstats_names (see rte_eth_xstats_get_names()),
+ *   and value is the statistic counter.
+ *   This parameter can be set to NULL if n is 0.
+ * @param n
+ *   The size of the xstats array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+__rte_deprecated
+int rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n);
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get_all, _v1705, 17.05);
+
+
+/**
+ * Retrieve names of all extended statistics of an Ethernet device.
  *
  * @param port_id
  *   The port identifier of the Ethernet device.
@@ -2296,7 +2367,7 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  *   An rte_eth_xstat_name array of at least *size* elements to
  *   be filled. If set to NULL, the function returns the required number
  *   of elements.
- * @param size
+ * @param n
  *   The size of the xstats_names array (number of elements).
  * @return
  *   - A positive value lower or equal to size: success. The return value
@@ -2307,9 +2378,10 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  *     shall not be used by the caller.
  *   - A negative value on error (invalid port id).
  */
-int rte_eth_xstats_get_names(uint8_t port_id,
-		struct rte_eth_xstat_name *xstats_names,
-		unsigned size);
+__rte_deprecated int rte_eth_xstats_get_names_all(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n);
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get_names_all, _v1705, 17.05);
+
 
 /**
  * Retrieve extended statistics of an Ethernet device.
@@ -2333,8 +2405,94 @@ int rte_eth_xstats_get_names(uint8_t port_id,
  *     shall not be used by the caller.
  *   - A negative value on error (invalid port id).
  */
-int rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
-		unsigned n);
+int rte_eth_xstats_get_v1702(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n);
+
+/**
+ * Retrieve extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param ids
+ *   A pointer to an ids array passed by application. This tells wich
+ *   statistics values function should retrieve. This parameter
+ *   can be set to NULL if n is 0. In this case function will retrieve
+ *   all avalible statistics.
+ * @param values
+ *   A pointer to a table to be filled with device statistics values.
+ * @param n
+ *   The size of the ids array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_v1705(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n);
+
+int rte_eth_xstats_get(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n);
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get, _v1705, 17.05);
+
+/**
+ * Retrieve extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats_names
+ *   A pointer to a table of structure of type *rte_eth_xstat*
+ *   to be filled with device statistics ids and values: id is the
+ *   index of the name string in xstats_names (see rte_eth_xstats_get_names()),
+ *   and value is the statistic counter.
+ *   This parameter can be set to NULL if n is 0.
+ * @param n
+ *   The size of the xstats array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_names_v1702(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n);
+
+/**
+ * Retrieve names of extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats_names
+ *   An rte_eth_xstat_name array of at least *size* elements to
+ *   be filled. If set to NULL, the function returns the required number
+ *   of elements.
+ * @param ids
+ *   IDs array given by app to retrieve specific statistics
+ * @param size
+ *   The size of the xstats_names array (number of elements).
+ * @return
+ *   - A positive value lower or equal to size: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than size: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_names_v1705(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+	unsigned int size);
+
+int rte_eth_xstats_get_names(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+	unsigned int size);
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get_names, _v1705, 17.05);
 
 /**
  * Reset extended statistics of an Ethernet device.
diff --git a/lib/librte_ether/rte_ether_version.map b/lib/librte_ether/rte_ether_version.map
index c6c9d0d..8a1a330 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -154,3 +154,15 @@ DPDK_17.02 {
 	rte_flow_validate;
 
 } DPDK_16.11;
+
+DPDK_17.05 {
+	global:
+
+	rte_eth_xstats_get_names;
+	rte_eth_xstats_get;
+	rte_eth_xstats_get_all;
+	rte_eth_xstats_get_names_all;
+	rte_eth_xstats_get_id_by_name;
+
+} DPDK_17.02;
+
-- 
1.9.1

Re: [PATCH v3 1/3] add new xstats API retrieving by id

[Van Haaren, Harry]

> From: Piasecki, JacekX
> Sent: Monday, April 3, 2017 1:10 PM
> To: dev@dpdk.org
> Cc: Van Haaren, Harry <harry.van.haaren@intel.com>; Jastrzebski, MichalX K
> <michalx.k.jastrzebski@intel.com>; Piasecki, JacekX <jacekx.piasecki@intel.com>; Kozak, KubaX
> <kubax.kozak@intel.com>; Kulasek, TomaszX <tomaszx.kulasek@intel.com>
> Subject: [PATCH v3 1/3] add new xstats API retrieving by id
> 
> From: Michal Jastrzebski <michalx.k.jastrzebski@intel.com>
> 
> Extended xstats API in ethdev library to allow grouping of stats
> logically so they can be retrieved per logical grouping – managed
> by the application.
> Changed existing functions rte_eth_xstats_get_names and
> rte_eth_xstats_get to use a new list of arguments: array of ids
> and array of values. ABI versioning mechanism was used to
> support backward compatibility.
> Introduced two new functions rte_eth_xstats_get_all and
> rte_eth_xstats_get_names_all which keeps functionality of the
> previous ones (respectively rte_eth_xstats_get and
> rte_eth_xstats_get_names) but use new API inside.
> Both functions marked as deprecated.
> Introduced new function: rte_eth_xstats_get_id_by_name
> to retrieve xstats ids by its names.
> 
> test-pmd: add support for new xstats API retrieving by id in
> testpmd application: xstats_get() and
> xstats_get_names() call with modified parameters.
> 
> proc_info: add support for new xstats API retrieving by id to
> proc_info application. There is a new argument --xstats-ids
> in proc_info command line to retrieve statistics given by ids.
> E.g. --xstats-ids="1,3,5,7,8"
> 
> Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
> Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
> Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>
> ---
>  app/proc_info/main.c                   | 148 +++++++++++-
>  app/test-pmd/config.c                  |  19 +-
>  lib/librte_ether/Makefile              |   2 +-
>  lib/librte_ether/rte_ethdev.c          | 422 +++++++++++++++++++++++++--------
>  lib/librte_ether/rte_ethdev.h          | 176 +++++++++++++-
>  lib/librte_ether/rte_ether_version.map |  12 +
>  6 files changed, 646 insertions(+), 133 deletions(-)

I gather this patchset contains various changes at once to avoid breaking compile due to function changes. All 3 of patchset compiled and working with ixgbe,

Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

Re: [PATCH v3 1/3] add new xstats API retrieving by id

[Thomas Monjalon]

2017-04-03 14:09, Jacek Piasecki:
> From: Michal Jastrzebski <michalx.k.jastrzebski@intel.com>
> 
> Extended xstats API in ethdev library to allow grouping of stats
> logically so they can be retrieved per logical grouping – managed
> by the application.
> Changed existing functions rte_eth_xstats_get_names and
> rte_eth_xstats_get to use a new list of arguments: array of ids
> and array of values. ABI versioning mechanism was used to
> support backward compatibility.
> Introduced two new functions rte_eth_xstats_get_all and
> rte_eth_xstats_get_names_all which keeps functionality of the
> previous ones (respectively rte_eth_xstats_get and
> rte_eth_xstats_get_names) but use new API inside.

Sorry, I still do not understand why we should complicate the API.
What is not possible with the existing API?

The v1 was submitted in the last days of the proposal deadline,
v2 in the last minutes of integration deadline,
and v3 is submitted after the deadline.

Given it is late and it is still difficult to understand the benefit,
I think it won't make the release 17.05.

Re: [PATCH v3 1/3] add new xstats API retrieving by id

[Van Haaren, Harry]

> From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> Sent: Tuesday, April 4, 2017 4:04 PM
> To: Piasecki, JacekX <jacekx.piasecki@intel.com>; Jastrzebski, MichalX K
> <michalx.k.jastrzebski@intel.com>
> Cc: dev@dpdk.org; Van Haaren, Harry <harry.van.haaren@intel.com>; Kozak, KubaX
> <kubax.kozak@intel.com>; Kulasek, TomaszX <tomaszx.kulasek@intel.com>
> Subject: Re: [dpdk-dev] [PATCH v3 1/3] add new xstats API retrieving by id
> 
> 2017-04-03 14:09, Jacek Piasecki:
> > From: Michal Jastrzebski <michalx.k.jastrzebski@intel.com>
> >
> > Extended xstats API in ethdev library to allow grouping of stats
> > logically so they can be retrieved per logical grouping – managed
> > by the application.
> > Changed existing functions rte_eth_xstats_get_names and
> > rte_eth_xstats_get to use a new list of arguments: array of ids
> > and array of values. ABI versioning mechanism was used to
> > support backward compatibility.
> > Introduced two new functions rte_eth_xstats_get_all and
> > rte_eth_xstats_get_names_all which keeps functionality of the
> > previous ones (respectively rte_eth_xstats_get and
> > rte_eth_xstats_get_names) but use new API inside.
> 
> Sorry, I still do not understand why we should complicate the API.
> What is not possible with the existing API?


The current API only allows retrieval of *all* of the NIC statistics at once. Given this requires a MMIO read PCI transaction per statistic it is an inefficient way of retrieving just a few key statistics. My understanding is that often a monitoring agent only has an interest in a few key statistics, and the current API forces wasting CPU time and PCIe bandwidth in retrieving *all* statistics; even those that the application didn't explicitly show an interest in.

The more flexible API as implemented in this patchset allow retrieval of statistics per ID. If a PMD wishes, it can be implemented to read just the required NIC registers. As a result, the monitoring application no longer wastes PCIe bandwidth and CPU time.


> The v1 was submitted in the last days of the proposal deadline,
> v2 in the last minutes of integration deadline,
> and v3 is submitted after the deadline.
> 
> Given it is late and it is still difficult to understand the benefit,
> I think it won't make the release 17.05.


All in all, the value add to DPDK of this patchset is to enable applications request statistics of interest to them, and to allow PMDs implement the statistic functions more efficiently if they wish. As a bonus, the ethdev and eventdev xstats APIs will have a consistent design, as eventdev already uses this optimized ID based method.

Unless there are serious concerns about the current API (which should have been flagged between a v1 and now), I don't see a reason to not update the API to use this improved method. If there are concerns about how to update applications to the new API, that can be addressed in a documentation patch if the community feels there is value in that?

Re: [PATCH v3 1/3] add new xstats API retrieving by id

[Thomas Monjalon]

2017-04-04 15:45, Van Haaren, Harry:
> From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > 2017-04-03 14:09, Jacek Piasecki:
> > > From: Michal Jastrzebski <michalx.k.jastrzebski@intel.com>
> > >
> > > Extended xstats API in ethdev library to allow grouping of stats
> > > logically so they can be retrieved per logical grouping – managed
> > > by the application.
> > > Changed existing functions rte_eth_xstats_get_names and
> > > rte_eth_xstats_get to use a new list of arguments: array of ids
> > > and array of values. ABI versioning mechanism was used to
> > > support backward compatibility.
> > > Introduced two new functions rte_eth_xstats_get_all and
> > > rte_eth_xstats_get_names_all which keeps functionality of the
> > > previous ones (respectively rte_eth_xstats_get and
> > > rte_eth_xstats_get_names) but use new API inside.
> > 
> > Sorry, I still do not understand why we should complicate the API.
> > What is not possible with the existing API?
> 
> 
> The current API only allows retrieval of *all* of the NIC statistics at once. Given this requires a MMIO read PCI transaction per statistic it is an inefficient way of retrieving just a few key statistics. My understanding is that often a monitoring agent only has an interest in a few key statistics, and the current API forces wasting CPU time and PCIe bandwidth in retrieving *all* statistics; even those that the application didn't explicitly show an interest in.
> 
> The more flexible API as implemented in this patchset allow retrieval of statistics per ID. If a PMD wishes, it can be implemented to read just the required NIC registers. As a result, the monitoring application no longer wastes PCIe bandwidth and CPU time.

Thanks for the explanation.
It has never been explained before.

> > The v1 was submitted in the last days of the proposal deadline,
> > v2 in the last minutes of integration deadline,
> > and v3 is submitted after the deadline.
> > 
> > Given it is late and it is still difficult to understand the benefit,
> > I think it won't make the release 17.05.
> 
> 
> All in all, the value add to DPDK of this patchset is to enable applications request statistics of interest to them, and to allow PMDs implement the statistic functions more efficiently if they wish. As a bonus, the ethdev and eventdev xstats APIs will have a consistent design, as eventdev already uses this optimized ID based method.
> 
> Unless there are serious concerns about the current API (which should have been flagged between a v1 and now), I don't see a reason to not update the API to use this improved method. If there are concerns about how to update applications to the new API, that can be addressed in a documentation patch if the community feels there is value in that?

I have commented on the need of explanation 3 days after the v1.
There was no answer.
So the review stopped at this point.
Then one month later (last Thursday), a v2 appears which
"replaced grouping mechanism to use mechanism based on IDs".
So you cannot say it "should have been flagged between a v1 and now".

Just because of the lack of communication, I do not want to spend these
days reviewing the API. It needs time and it will wait.

[PATCH v4 0/3] Extended xstats API in ethdev library to allow grouping of stats

[Jacek Piasecki]

Extended xstats API in ethdev library to allow grouping of stats logically
so they can be retrieved per logical grouping  managed by the application.
Changed existing functions rte_eth_xstats_get_names and rte_eth_xstats_get
to use a new list of arguments: array of ids and array of values.
ABI versioning mechanism was used to support backward compatibility.
Introduced two new functions rte_eth_xstats_get_all and
rte_eth_xstats_get_names_all which keeps functionality of the previous
ones (respectively rte_eth_xstats_get and rte_eth_xstats_get_names)
but use new API inside. Both functions marked as deprecated. 
Introduced new function: rte_eth_xstats_get_id_by_name to retrieve
xstats ids by its names.
Extended functionality of proc_info application:
--xstats-name NAME: to display single xstat value by NAME
Updated test-pmd application to use new API.

v4 changes:
documentation change after API modification
fix xstats display for PMD without _by_ids() functions
fix ABI validator errors

v3 changes:
checkpatch fixes
removed malloc bug in ethdev
add new command to proc_info and IDs parsing
merged testpmd and proc_info patch with library patch

Jacek Piasecki (3):
  ethdev: new xstats API add retrieving by ID
  net/e1000: new xstats API add ID support for e1000
  net/ixgbe: new xstats API add ID support for ixgbe

 app/proc_info/main.c                    | 150 ++++++++++-
 app/test-pmd/config.c                   |  19 +-
 doc/guides/prog_guide/poll_mode_drv.rst | 174 +++++++++++--
 drivers/net/e1000/igb_ethdev.c          |  92 ++++++-
 drivers/net/ixgbe/ixgbe_ethdev.c        | 179 ++++++++++++++
 lib/librte_ether/Makefile               |   2 +-
 lib/librte_ether/rte_ethdev.c           | 426 ++++++++++++++++++++++++--------
 lib/librte_ether/rte_ethdev.h           | 176 ++++++++++++-
 lib/librte_ether/rte_ether_version.map  |   5 +
 9 files changed, 1066 insertions(+), 157 deletions(-)

-- 
1.9.1

[PATCH v4 1/3] ethdev: new xstats API add retrieving by ID

[Jacek Piasecki]

Extended xstats API in ethdev library to allow grouping of stats
logically so they can be retrieved per logical grouping  managed
by the application.
Changed existing functions rte_eth_xstats_get_names and
rte_eth_xstats_get to use a new list of arguments: array of ids
and array of values. ABI versioning mechanism was used to
support backward compatibility.
Introduced two new functions rte_eth_xstats_get_all and
rte_eth_xstats_get_names_all which keeps functionality of the
previous ones (respectively rte_eth_xstats_get and
rte_eth_xstats_get_names) but use new API inside.
Both functions marked as deprecated.
Introduced new function: rte_eth_xstats_get_id_by_name
to retrieve xstats ids by its names.

test-pmd: add support for new xstats API retrieving by id in
testpmd application: xstats_get() and
xstats_get_names() call with modified parameters.

proc_info: add support for new xstats API retrieving by id to
proc_info application. There is a new argument --xstats-ids
in proc_info command line to retrieve statistics given by ids.
E.g. --xstats-ids="1,3,5,7,8"

doc: add description for modified xstats API
Documentation change for modified extended statistics API functions.
The old API only allows retrieval of *all* of the NIC statistics
at once. Given this requires a MMIO read PCI transaction per statistic
it is an inefficient way of retrieving just a few key statistics.
Often a monitoring agent only has an interest in a few key statistics,
and the old API forces wasting CPU time and PCIe bandwidth in retrieving
*all* statistics; even those that the application didn't explicitly
show an interest in.
The new, more flexible API allow retrieval of statistics per ID.
If a PMD wishes, it can be implemented to read just the required
NIC registers. As a result, the monitoring application no longer wastes
PCIe bandwidth and CPU time.

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>
---
 app/proc_info/main.c                    | 150 ++++++++++-
 app/test-pmd/config.c                   |  19 +-
 doc/guides/prog_guide/poll_mode_drv.rst | 174 +++++++++++--
 lib/librte_ether/Makefile               |   2 +-
 lib/librte_ether/rte_ethdev.c           | 426 ++++++++++++++++++++++++--------
 lib/librte_ether/rte_ethdev.h           | 176 ++++++++++++-
 lib/librte_ether/rte_ether_version.map  |   5 +
 7 files changed, 797 insertions(+), 155 deletions(-)

diff --git a/app/proc_info/main.c b/app/proc_info/main.c
index d576b42..d0eae4b 100644
--- a/app/proc_info/main.c
+++ b/app/proc_info/main.c
@@ -86,6 +86,14 @@
 static uint32_t reset_xstats;
 /**< Enable memory info. */
 static uint32_t mem_info;
+/**< Enable displaying xstat name. */
+static uint32_t enable_xstats_name;
+static char *xstats_name;
+
+/**< Enable xstats by ids. */
+#define MAX_NB_XSTATS_IDS 1024
+static uint32_t nb_xstats_ids;
+static uint64_t xstats_ids[MAX_NB_XSTATS_IDS];
 
 /**< display usage */
 static void
@@ -97,8 +105,9 @@
 		"  --stats: to display port statistics, enabled by default\n"
 		"  --xstats: to display extended port statistics, disabled by "
 			"default\n"
-		"  --metrics: to display derived metrics of the ports, disabled by "
-			"default\n"
+		"  --xstats-name NAME: to display single xstat value by NAME\n"
+		"  --xstats-ids IDLIST: to display xstat values by id. "
+			"The argument is comma-separated list of xstat ids to print out.\n"
 		"  --stats-reset: to reset port statistics\n"
 		"  --xstats-reset: to reset port extended statistics\n"
 		"  --collectd-format: to print statistics to STDOUT in expected by collectd format\n"
@@ -132,6 +141,33 @@
 
 }
 
+/*
+ * Parse ids value list into array
+ */
+static int
+parse_xstats_ids(char *list, uint64_t *ids, int limit) {
+	int length;
+	char *token;
+	char *ctx = NULL;
+	char *endptr;
+
+	length = 0;
+	token = strtok_r(list, ",", &ctx);
+	while (token != NULL) {
+		ids[length] = strtoull(token, &endptr, 10);
+		if (*endptr != '\0')
+			return -EINVAL;
+
+		length++;
+		if (length >= limit)
+			return -E2BIG;
+
+		token = strtok_r(NULL, ",", &ctx);
+	}
+
+	return length;
+}
+
 static int
 proc_info_preparse_args(int argc, char **argv)
 {
@@ -178,7 +214,9 @@
 		{"xstats", 0, NULL, 0},
 		{"metrics", 0, NULL, 0},
 		{"xstats-reset", 0, NULL, 0},
+		{"xstats-name", required_argument, NULL, 1},
 		{"collectd-format", 0, NULL, 0},
+		{"xstats-ids", 1, NULL, 1},
 		{"host-id", 0, NULL, 0},
 		{NULL, 0, 0, 0}
 	};
@@ -224,7 +262,28 @@
 					MAX_LONG_OPT_SZ))
 				reset_xstats = 1;
 			break;
+		case 1:
+			/* Print xstat single value given by name*/
+			if (!strncmp(long_option[option_index].name,
+					"xstats-name", MAX_LONG_OPT_SZ)) {
+				enable_xstats_name = 1;
+				xstats_name = optarg;
+				printf("name:%s:%s\n",
+						long_option[option_index].name,
+						optarg);
+			} else if (!strncmp(long_option[option_index].name,
+					"xstats-ids",
+					MAX_LONG_OPT_SZ))	{
+				nb_xstats_ids = parse_xstats_ids(optarg,
+						xstats_ids, MAX_NB_XSTATS_IDS);
+
+				if (nb_xstats_ids <= 0) {
+					printf("xstats-id list parse error.\n");
+					return -1;
+				}
 
+			}
+			break;
 		default:
 			proc_info_usage(prgname);
 			return -1;
@@ -351,20 +410,82 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 }
 
 static void
+nic_xstats_by_name_display(uint8_t port_id, char *name)
+{
+	uint64_t id;
+
+	printf("###### NIC statistics for port %-2d, statistic name '%s':\n",
+			   port_id, name);
+
+	if (rte_eth_xstats_get_id_by_name(port_id, name, &id) == 0)
+		printf("%s: %"PRIu64"\n", name, id);
+	else
+		printf("Statistic not found...\n");
+
+}
+
+static void
+nic_xstats_by_ids_display(uint8_t port_id, uint64_t *ids, int len)
+{
+	struct rte_eth_xstat_name *xstats_names;
+	uint64_t *values;
+	int ret, i;
+	static const char *nic_stats_border = "########################";
+
+	values = malloc(sizeof(values) * len);
+	if (values == NULL) {
+		printf("Cannot allocate memory for xstats\n");
+		return;
+	}
+
+	xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
+	if (xstats_names == NULL) {
+		printf("Cannot allocate memory for xstat names\n");
+		free(values);
+		return;
+	}
+
+	if (len != rte_eth_xstats_get_names(
+			port_id, xstats_names, len, ids)) {
+		printf("Cannot get xstat names\n");
+		goto err;
+	}
+
+	printf("###### NIC extended statistics for port %-2d #########\n",
+			   port_id);
+	printf("%s############################\n", nic_stats_border);
+	ret = rte_eth_xstats_get(port_id, ids, values, len);
+	if (ret < 0 || ret > len) {
+		printf("Cannot get xstats\n");
+		goto err;
+	}
+
+	for (i = 0; i < len; i++)
+		printf("%s: %"PRIu64"\n",
+			xstats_names[i].name,
+			values[i]);
+
+	printf("%s############################\n", nic_stats_border);
+err:
+	free(values);
+	free(xstats_names);
+}
+
+static void
 nic_xstats_display(uint8_t port_id)
 {
 	struct rte_eth_xstat_name *xstats_names;
-	struct rte_eth_xstat *xstats;
+	uint64_t *values;
 	int len, ret, i;
 	static const char *nic_stats_border = "########################";
 
-	len = rte_eth_xstats_get_names(port_id, NULL, 0);
+	len = rte_eth_xstats_get_names(port_id, NULL, 0, NULL);
 	if (len < 0) {
 		printf("Cannot get xstats count\n");
 		return;
 	}
-	xstats = malloc(sizeof(xstats[0]) * len);
-	if (xstats == NULL) {
+	values = malloc(sizeof(values) * len);
+	if (values == NULL) {
 		printf("Cannot allocate memory for xstats\n");
 		return;
 	}
@@ -372,11 +493,11 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 	xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
 	if (xstats_names == NULL) {
 		printf("Cannot allocate memory for xstat names\n");
-		free(xstats);
+		free(values);
 		return;
 	}
 	if (len != rte_eth_xstats_get_names(
-			port_id, xstats_names, len)) {
+			port_id, xstats_names, len, NULL)) {
 		printf("Cannot get xstat names\n");
 		goto err;
 	}
@@ -385,7 +506,7 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 			   port_id);
 	printf("%s############################\n",
 			   nic_stats_border);
-	ret = rte_eth_xstats_get(port_id, xstats, len);
+	ret = rte_eth_xstats_get(port_id, NULL, values, len);
 	if (ret < 0 || ret > len) {
 		printf("Cannot get xstats\n");
 		goto err;
@@ -401,18 +522,18 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 						  xstats_names[i].name);
 			sprintf(buf, "PUTVAL %s/dpdkstat-port.%u/%s-%s N:%"
 				PRIu64"\n", host_id, port_id, counter_type,
-				xstats_names[i].name, xstats[i].value);
+				xstats_names[i].name, values[i]);
 			write(stdout_fd, buf, strlen(buf));
 		} else {
 			printf("%s: %"PRIu64"\n", xstats_names[i].name,
-			       xstats[i].value);
+					values[i]);
 		}
 	}
 
 	printf("%s############################\n",
 			   nic_stats_border);
 err:
-	free(xstats);
+	free(values);
 	free(xstats_names);
 }
 
@@ -551,6 +672,11 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 				nic_stats_clear(i);
 			else if (reset_xstats)
 				nic_xstats_clear(i);
+			else if (enable_xstats_name)
+				nic_xstats_by_name_display(i, xstats_name);
+			else if (nb_xstats_ids > 0)
+				nic_xstats_by_ids_display(i, xstats_ids,
+						nb_xstats_ids);
 			else if (enable_metrics)
 				metrics_display(i);
 		}
diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 4d873cd..ef07925 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -264,9 +264,9 @@ struct rss_type_info {
 void
 nic_xstats_display(portid_t port_id)
 {
-	struct rte_eth_xstat *xstats;
 	int cnt_xstats, idx_xstat;
 	struct rte_eth_xstat_name *xstats_names;
+	uint64_t *values;
 
 	printf("###### NIC extended statistics for port %-2d\n", port_id);
 	if (!rte_eth_dev_is_valid_port(port_id)) {
@@ -275,7 +275,7 @@ struct rss_type_info {
 	}
 
 	/* Get count */
-	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, 0);
+	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, 0, NULL);
 	if (cnt_xstats  < 0) {
 		printf("Error: Cannot get count of xstats\n");
 		return;
@@ -288,23 +288,24 @@ struct rss_type_info {
 		return;
 	}
 	if (cnt_xstats != rte_eth_xstats_get_names(
-			port_id, xstats_names, cnt_xstats)) {
+			port_id, xstats_names, cnt_xstats, NULL)) {
 		printf("Error: Cannot get xstats lookup\n");
 		free(xstats_names);
 		return;
 	}
 
 	/* Get stats themselves */
-	xstats = malloc(sizeof(struct rte_eth_xstat) * cnt_xstats);
-	if (xstats == NULL) {
+	values = malloc(sizeof(values) * cnt_xstats);
+	if (values == NULL) {
 		printf("Cannot allocate memory for xstats\n");
 		free(xstats_names);
 		return;
 	}
-	if (cnt_xstats != rte_eth_xstats_get(port_id, xstats, cnt_xstats)) {
+	if (cnt_xstats != rte_eth_xstats_get(port_id, NULL, values,
+			cnt_xstats)) {
 		printf("Error: Unable to get xstats\n");
 		free(xstats_names);
-		free(xstats);
+		free(values);
 		return;
 	}
 
@@ -312,9 +313,9 @@ struct rss_type_info {
 	for (idx_xstat = 0; idx_xstat < cnt_xstats; idx_xstat++)
 		printf("%s: %"PRIu64"\n",
 			xstats_names[idx_xstat].name,
-			xstats[idx_xstat].value);
+			values[idx_xstat]);
 	free(xstats_names);
-	free(xstats);
+	free(values);
 }
 
 void
diff --git a/doc/guides/prog_guide/poll_mode_drv.rst b/doc/guides/prog_guide/poll_mode_drv.rst
index e48c121..3372f30 100644
--- a/doc/guides/prog_guide/poll_mode_drv.rst
+++ b/doc/guides/prog_guide/poll_mode_drv.rst
@@ -334,24 +334,20 @@ The Ethernet device API exported by the Ethernet PMDs is described in the *DPDK
 Extended Statistics API
 ~~~~~~~~~~~~~~~~~~~~~~~
 
-The extended statistics API allows each individual PMD to expose a unique set
-of statistics. Accessing these from application programs is done via two
-functions:
-
-* ``rte_eth_xstats_get``: Fills in an array of ``struct rte_eth_xstat``
-  with extended statistics.
-* ``rte_eth_xstats_get_names``: Fills in an array of
-  ``struct rte_eth_xstat_name`` with extended statistic name lookup
-  information.
-
-Each ``struct rte_eth_xstat`` contains an identifier and value pair, and
-each ``struct rte_eth_xstat_name`` contains a string. Each identifier
-within the ``struct rte_eth_xstat`` lookup array must have a corresponding
-entry in the ``struct rte_eth_xstat_name`` lookup array. Within the latter
-the index of the entry is the identifier the string is associated with.
-These identifiers, as well as the number of extended statistic exposed, must
-remain constant during runtime. Note that extended statistic identifiers are
-driver-specific, and hence might not be the same for different ports.
+The extended statistics API allows a PMD to expose all statistics that are
+available to it, including statistics that are unique to the device.
+Each statistic has three properties ``name``, ``id`` and ``value``:
+
+* ``name``: A human readable string formatted by the scheme detailed below.
+* ``id``: An integer that represents only that statistic.
+* ``value``: A unsigned 64-bit integer that is the value of the statistic.
+
+The API consists of various ``rte_eth_xstats_*()`` functions, and allows an
+application to be flexible in how it retrieves statistics.
+
+
+Scheme for Human Readable Names
+_______________________________
 
 A naming scheme exists for the strings exposed to clients of the API. This is
 to allow scraping of the API for statistics of interest. The naming scheme uses
@@ -363,8 +359,8 @@ strings split by a single underscore ``_``. The scheme is as follows:
 * detail n
 * unit
 
-Examples of common statistics xstats strings, formatted to comply to the scheme
-proposed above:
+Examples of common statistics xstats strings, formatted to comply to the
+above scheme:
 
 * ``rx_bytes``
 * ``rx_crc_errors``
@@ -378,7 +374,7 @@ associated with the receive side of the NIC.  The second component ``packets``
 indicates that the unit of measure is packets.
 
 A more complicated example: ``tx_size_128_to_255_packets``. In this example,
-``tx`` indicates transmission, ``size``  is the first detail, ``128`` etc are
+``tx`` indicates transmission, ``size``  is the first detail, ``128`` etc. are
 more details, and ``packets`` indicates that this is a packet counter.
 
 Some additions in the metadata scheme are as follows:
@@ -392,3 +388,139 @@ Some additions in the metadata scheme are as follows:
 An example where queue numbers are used is as follows: ``tx_q7_bytes`` which
 indicates this statistic applies to queue number 7, and represents the number
 of transmitted bytes on that queue.
+
+API Design
+__________
+
+The xstats API uses the ``name``, ``id``, and ``value`` to allow performant
+lookup of specific statistics. Performant lookup means two things;
+
+* No string comparisons with the ``name`` of the statistic in fast-path
+* Allow requesting of only the statistics of interest
+
+The API ensures these requirements are met by mapping the ``name`` of the
+statistic to a unique ``id``, which is used as a key for lookup in the fast-path.
+The API allows applications to request an array of ``id`` values, so that the
+PMD only performs the required calculations. Expected usage is that the
+application scans the ``name`` of each statistic, and caches the ``id``
+if it has an interest in that statistic. On the fast-path, the integer can be used
+to retrieve the actual ``value`` of the statistic that the ``id`` represents.
+
+API Functions
+_____________
+
+The API is built out of a small number of functions, which can be used to
+retrieve the number of statistics and the names, IDs and values of those
+statistics.
+
+* ``rte_eth_xstats_get_names()``: returns the names of the statistics. When given a
+  ``NULL`` parameter the function returns the number of statistics that are available.
+
+* ``rte_eth_xstats_get_id_by_name()``: Searches for the statistic ID that matches
+  ``xstat_name``. If found, the ``id`` integer is set.
+
+* ``rte_eth_xstats_get()``: Fills in an array of ``uint64_t`` values
+  with matching the provided ``ids`` array. If the ``ids`` array is NULL, it
+  returns all statistics that are available.
+
+
+Application Usage
+_________________
+
+Imagine an application that wants to view the dropped packet count. If no
+packets are dropped, the application does not read any other metrics for
+performance reasons. If packets are dropped, the application has a particular
+set of statistics that it requests. This "set" of statistics allows the app to
+decide what next steps to perform. The following code-snippets show how the
+xstats API can be used to achieve this goal.
+
+First step is to get all statistics names and list them:
+
+.. code-block:: c
+
+    struct rte_eth_xstat_name *xstats_names;
+    uint64_t *values;
+    int len, i;
+
+    /* Get number of stats */
+    len = rte_eth_xstats_get_names(port_id, NULL, NULL, 0);
+    if (len < 0) {
+        printf("Cannot get xstats count\n");
+        goto err;
+    }
+
+    xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
+    if (xstats_names == NULL) {
+        printf("Cannot allocate memory for xstat names\n");
+        goto err;
+    }
+
+    /* Retrieve xstats names, passing NULL for IDs to return all statistics */
+    if (len != rte_eth_xstats_get_names(port_id, xstats_names, NULL, len)) {
+        printf("Cannot get xstat names\n");
+        goto err;
+    }
+
+    values = malloc(sizeof(values) * len);
+    if (values == NULL) {
+        printf("Cannot allocate memory for xstats\n");
+        goto err;
+    }
+
+    /* Getting xstats values */
+    if (len != rte_eth_xstats_get(port_id, NULL, values, len)) {
+        printf("Cannot get xstat values\n");
+        goto err;
+    }
+
+    /* Print all xstats names and values */
+    for (i = 0; i < len; i++) {
+        printf("%s: %"PRIu64"\n", xstats_names[i].name, values[i]);
+    }
+
+The application has access to the names of all of the statistics that the PMD
+exposes. The application can decide which statistics are of interest, cache the
+ids of those statistics by looking up the name as follows:
+
+.. code-block:: c
+
+    uint64_t id;
+    uint64_t value;
+    const char *xstat_name = "rx_errors";
+
+    if(!rte_eth_xstats_get_id_by_name(port_id, xstat_name, &id)) {
+        rte_eth_xstats_get(port_id, &id, &value, 1);
+        printf("%s: %"PRIu64"\n", xstat_name, value);
+    }
+    else {
+        printf("Cannot find xstats with a given name\n");
+        goto err;
+    }
+
+The API provides flexibility to the application so that it can look up multiple
+statistics using an array containing multiple ``id`` numbers. This reduces the
+function call overhead of retrieving statistics, and makes lookup of multiple
+statistics simpler for the application.
+
+.. code-block:: c
+
+    #define APP_NUM_STATS 4
+    /* application cached these ids previously; see above */
+    uint64_t ids_array[APP_NUM_STATS] = {3,4,7,21};
+    uint64_t value_array[APP_NUM_STATS];
+
+    /* Getting multiple xstats values from array of IDs */
+    rte_eth_xstats_get(port_id, ids_array, value_array, APP_NUM_STATS);
+
+    uint32_t i;
+    for(i = 0; i < APP_NUM_STATS; i++) {
+        printf("%d: %"PRIu64"\n", ids_array[i], value_array[i]);
+    }
+
+
+This array lookup API for xstats allows the application create multiple
+"groups" of statistics, and look up the values of those IDs using a single API
+call. As an end result, the application is able to achieve its goal of
+monitoring a single statistic ("rx_errors" in this case), and if that shows
+packets being dropped, it can easily retrieve a "set" of statistics using the
+IDs array parameter to ``rte_eth_xstats_get`` function.
diff --git a/lib/librte_ether/Makefile b/lib/librte_ether/Makefile
index 066114b..5bbf721 100644
--- a/lib/librte_ether/Makefile
+++ b/lib/librte_ether/Makefile
@@ -41,7 +41,7 @@ CFLAGS += $(WERROR_FLAGS)
 
 EXPORT_MAP := rte_ether_version.map
 
-LIBABIVER := 6
+LIBABIVER := 7
 
 SRCS-y += rte_ethdev.c
 SRCS-y += rte_flow.c
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 4e1e6dc..e5bab9c 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1454,12 +1454,19 @@ struct rte_eth_dev *
 
 	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
 	dev = &rte_eth_devices[port_id];
+	if (dev->dev_ops->xstats_get_names_by_ids != NULL) {
+		count = (*dev->dev_ops->xstats_get_names_by_ids)(dev, NULL,
+				NULL, 0);
+		if (count < 0)
+			return count;
+	}
 	if (dev->dev_ops->xstats_get_names != NULL) {
 		count = (*dev->dev_ops->xstats_get_names)(dev, NULL, 0);
 		if (count < 0)
 			return count;
 	} else
 		count = 0;
+
 	count += RTE_NB_STATS;
 	count += RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS) *
 		 RTE_NB_RXQ_STATS;
@@ -1469,150 +1476,363 @@ struct rte_eth_dev *
 }
 
 int
-rte_eth_xstats_get_names(uint8_t port_id,
-	struct rte_eth_xstat_name *xstats_names,
-	unsigned size)
+rte_eth_xstats_get_id_by_name(uint8_t port_id, const char *xstat_name,
+		uint64_t *id)
 {
-	struct rte_eth_dev *dev;
-	int cnt_used_entries;
-	int cnt_expected_entries;
-	int cnt_driver_entries;
-	uint32_t idx, id_queue;
-	uint16_t num_q;
+	int cnt_xstats, idx_xstat;
 
-	cnt_expected_entries = get_xstats_count(port_id);
-	if (xstats_names == NULL || cnt_expected_entries < 0 ||
-			(int)size < cnt_expected_entries)
-		return cnt_expected_entries;
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
 
-	/* port_id checked in get_xstats_count() */
-	dev = &rte_eth_devices[port_id];
-	cnt_used_entries = 0;
+	if (!id) {
+		RTE_PMD_DEBUG_TRACE("Error: id pointer is NULL\n");
+		return -1;
+	}
+
+	if (!xstat_name) {
+		RTE_PMD_DEBUG_TRACE("Error: xstat_name pointer is NULL\n");
+		return -1;
+	}
+
+	/* Get count */
+	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, 0, NULL);
+	if (cnt_xstats  < 0) {
+		RTE_PMD_DEBUG_TRACE("Error: Cannot get count of xstats\n");
+		return -1;
+	}
+
+	/* Get id-name lookup table */
+	struct rte_eth_xstat_name xstats_names[cnt_xstats];
+
+	if (cnt_xstats != rte_eth_xstats_get_names(
+			port_id, xstats_names, cnt_xstats, NULL)) {
+		RTE_PMD_DEBUG_TRACE("Error: Cannot get xstats lookup\n");
+		return -1;
+	}
 
-	for (idx = 0; idx < RTE_NB_STATS; idx++) {
-		snprintf(xstats_names[cnt_used_entries].name,
-			sizeof(xstats_names[0].name),
-			"%s", rte_stats_strings[idx].name);
-		cnt_used_entries++;
+	for (idx_xstat = 0; idx_xstat < cnt_xstats; idx_xstat++) {
+		if (!strcmp(xstats_names[idx_xstat].name, xstat_name)) {
+			*id = idx_xstat;
+			return 0;
+		};
 	}
-	num_q = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	for (id_queue = 0; id_queue < num_q; id_queue++) {
-		for (idx = 0; idx < RTE_NB_RXQ_STATS; idx++) {
+
+	return -EINVAL;
+}
+
+int
+rte_eth_xstats_get_names_v1705(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, unsigned int size,
+	uint64_t *ids)
+{
+	/* Get all xstats */
+	if (!ids) {
+		struct rte_eth_dev *dev;
+		int cnt_used_entries;
+		int cnt_expected_entries;
+		int cnt_driver_entries;
+		uint32_t idx, id_queue;
+		uint16_t num_q;
+
+		cnt_expected_entries = get_xstats_count(port_id);
+		if (xstats_names == NULL || cnt_expected_entries < 0 ||
+				(int)size < cnt_expected_entries)
+			return cnt_expected_entries;
+
+		/* port_id checked in get_xstats_count() */
+		dev = &rte_eth_devices[port_id];
+		cnt_used_entries = 0;
+
+		for (idx = 0; idx < RTE_NB_STATS; idx++) {
 			snprintf(xstats_names[cnt_used_entries].name,
 				sizeof(xstats_names[0].name),
-				"rx_q%u%s",
-				id_queue, rte_rxq_stats_strings[idx].name);
+				"%s", rte_stats_strings[idx].name);
 			cnt_used_entries++;
 		}
+		num_q = RTE_MIN(dev->data->nb_rx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		for (id_queue = 0; id_queue < num_q; id_queue++) {
+			for (idx = 0; idx < RTE_NB_RXQ_STATS; idx++) {
+				snprintf(xstats_names[cnt_used_entries].name,
+					sizeof(xstats_names[0].name),
+					"rx_q%u%s",
+					id_queue,
+					rte_rxq_stats_strings[idx].name);
+				cnt_used_entries++;
+			}
+
+		}
+		num_q = RTE_MIN(dev->data->nb_tx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		for (id_queue = 0; id_queue < num_q; id_queue++) {
+			for (idx = 0; idx < RTE_NB_TXQ_STATS; idx++) {
+				snprintf(xstats_names[cnt_used_entries].name,
+					sizeof(xstats_names[0].name),
+					"tx_q%u%s",
+					id_queue,
+					rte_txq_stats_strings[idx].name);
+				cnt_used_entries++;
+			}
+		}
+
+		if (dev->dev_ops->xstats_get_names_by_ids != NULL) {
+			/* If there are any driver-specific xstats, append them
+			 * to end of list.
+			 */
+			cnt_driver_entries =
+				(*dev->dev_ops->xstats_get_names_by_ids)(
+				dev,
+				xstats_names + cnt_used_entries,
+				NULL,
+				size - cnt_used_entries);
+			if (cnt_driver_entries < 0)
+				return cnt_driver_entries;
+			cnt_used_entries += cnt_driver_entries;
+
+		} else if (dev->dev_ops->xstats_get_names != NULL) {
+			/* If there are any driver-specific xstats, append them
+			 * to end of list.
+			 */
+			cnt_driver_entries = (*dev->dev_ops->xstats_get_names)(
+				dev,
+				xstats_names + cnt_used_entries,
+				size - cnt_used_entries);
+			if (cnt_driver_entries < 0)
+				return cnt_driver_entries;
+			cnt_used_entries += cnt_driver_entries;
+		}
 
+		return cnt_used_entries;
 	}
-	num_q = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	for (id_queue = 0; id_queue < num_q; id_queue++) {
-		for (idx = 0; idx < RTE_NB_TXQ_STATS; idx++) {
-			snprintf(xstats_names[cnt_used_entries].name,
-				sizeof(xstats_names[0].name),
-				"tx_q%u%s",
-				id_queue, rte_txq_stats_strings[idx].name);
-			cnt_used_entries++;
+	/* Get only xstats given by IDS */
+	else {
+		uint16_t len, i;
+		struct rte_eth_xstat_name *xstats_names_copy;
+
+		len = rte_eth_xstats_get_names_v1705(port_id, NULL, 0, NULL);
+
+		xstats_names_copy =
+				malloc(sizeof(struct rte_eth_xstat_name) * len);
+		if (!xstats_names_copy) {
+			RTE_PMD_DEBUG_TRACE(
+			     "ERROR: can't allocate memory for values_copy\n");
+			free(xstats_names_copy);
+			return -1;
+		}
+
+		rte_eth_xstats_get_names_v1705(port_id, xstats_names_copy,
+				len, NULL);
+
+		for (i = 0; i < size; i++) {
+			if (ids[i] >= len) {
+				RTE_PMD_DEBUG_TRACE(
+					"ERROR: id value isn't valid\n");
+				return -1;
+			}
+			strcpy(xstats_names[i].name,
+					xstats_names_copy[ids[i]].name);
 		}
+		free(xstats_names_copy);
+		return size;
 	}
+}
+MAP_STATIC_SYMBOL(int
+		rte_eth_xstats_get_names(uint8_t port_id,
+			struct rte_eth_xstat_name *xstats_names,
+			unsigned int size,
+			uint64_t *ids), rte_eth_xstats_get_names_v1705);
 
-	if (dev->dev_ops->xstats_get_names != NULL) {
-		/* If there are any driver-specific xstats, append them
-		 * to end of list.
-		 */
-		cnt_driver_entries = (*dev->dev_ops->xstats_get_names)(
-			dev,
-			xstats_names + cnt_used_entries,
-			size - cnt_used_entries);
-		if (cnt_driver_entries < 0)
-			return cnt_driver_entries;
-		cnt_used_entries += cnt_driver_entries;
+int
+rte_eth_xstats_get_names_v1607(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names,
+	unsigned int size)
+{
+	return rte_eth_xstats_get_names(port_id, xstats_names, size, NULL);
+}
+VERSION_SYMBOL(rte_eth_xstats_get_names, _v1607, 16.07);
+
+/* retrieve ethdev extended statistics */
+int
+rte_eth_xstats_get_v22(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n)
+{
+	uint64_t *values_copy;
+	uint16_t size, i;
+
+	values_copy = malloc(sizeof(values_copy) * n);
+	if (!values_copy) {
+		RTE_PMD_DEBUG_TRACE(
+				"ERROR: Cannot allocate memory for xstats\n");
+		return -1;
 	}
+	size = rte_eth_xstats_get(port_id, 0, values_copy, n);
 
-	return cnt_used_entries;
+	for (i = 0; i < n; i++) {
+		xstats[i].id = i;
+		xstats[i].value = values_copy[i];
+	}
+	free(values_copy);
+	return size;
 }
+VERSION_SYMBOL(rte_eth_xstats_get, _v22, 2.2);
 
 /* retrieve ethdev extended statistics */
 int
-rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
-	unsigned n)
+rte_eth_xstats_get_v1705(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n)
 {
-	struct rte_eth_stats eth_stats;
-	struct rte_eth_dev *dev;
-	unsigned count = 0, i, q;
-	signed xcount = 0;
-	uint64_t val, *stats_ptr;
-	uint16_t nb_rxqs, nb_txqs;
+	/* If need all xstats */
+	if (!ids) {
+		struct rte_eth_stats eth_stats;
+		struct rte_eth_dev *dev;
+		unsigned int count = 0, i, q;
+		signed int xcount = 0;
+		uint64_t val, *stats_ptr;
+		uint16_t nb_rxqs, nb_txqs;
 
-	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
+		RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+		dev = &rte_eth_devices[port_id];
 
-	dev = &rte_eth_devices[port_id];
+		nb_rxqs = RTE_MIN(dev->data->nb_rx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		nb_txqs = RTE_MIN(dev->data->nb_tx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
 
-	nb_rxqs = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	nb_txqs = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		/* Return generic statistics */
+		count = RTE_NB_STATS + (nb_rxqs * RTE_NB_RXQ_STATS) +
+			(nb_txqs * RTE_NB_TXQ_STATS);
 
-	/* Return generic statistics */
-	count = RTE_NB_STATS + (nb_rxqs * RTE_NB_RXQ_STATS) +
-		(nb_txqs * RTE_NB_TXQ_STATS);
 
-	/* implemented by the driver */
-	if (dev->dev_ops->xstats_get != NULL) {
-		/* Retrieve the xstats from the driver at the end of the
-		 * xstats struct.
-		 */
-		xcount = (*dev->dev_ops->xstats_get)(dev,
-				     xstats ? xstats + count : NULL,
-				     (n > count) ? n - count : 0);
+		/* implemented by the driver */
+		if (dev->dev_ops->xstats_get_by_ids != NULL) {
+			/* Retrieve the xstats from the driver at the end of the
+			 * xstats struct. Retrieve all xstats.
+			 */
+			xcount = (*dev->dev_ops->xstats_get_by_ids)(dev,
+					NULL,
+					values ? values + count : NULL,
+					(n > count) ? n - count : 0);
+
+			if (xcount < 0)
+				return xcount;
+		/* implemented by the driver */
+		} else if (dev->dev_ops->xstats_get != NULL) {
+			/* Retrieve the xstats from the driver at the end of the
+			 * xstats struct. Retrieve all xstats.
+			 * Compatibility for PMD without xstats_get_by_ids
+			 */
+			unsigned int size = (n > count) ? n - count : 1;
+			struct rte_eth_xstat xstats[size];
 
-		if (xcount < 0)
-			return xcount;
-	}
+			xcount = (*dev->dev_ops->xstats_get)(dev,
+					values ? xstats : NULL,	size);
 
-	if (n < count + xcount || xstats == NULL)
-		return count + xcount;
+			if (xcount < 0)
+				return xcount;
+
+			if (values != NULL)
+				for (i = 0 ; i < (unsigned int)xcount; i++)
+					values[i + count] = xstats[i].value;
+		}
 
-	/* now fill the xstats structure */
-	count = 0;
-	rte_eth_stats_get(port_id, &eth_stats);
+		if (n < count + xcount || values == NULL)
+			return count + xcount;
 
-	/* global stats */
-	for (i = 0; i < RTE_NB_STATS; i++) {
-		stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_stats_strings[i].offset);
-		val = *stats_ptr;
-		xstats[count++].value = val;
-	}
+		/* now fill the xstats structure */
+		count = 0;
+		rte_eth_stats_get(port_id, &eth_stats);
 
-	/* per-rxq stats */
-	for (q = 0; q < nb_rxqs; q++) {
-		for (i = 0; i < RTE_NB_RXQ_STATS; i++) {
+		/* global stats */
+		for (i = 0; i < RTE_NB_STATS; i++) {
 			stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_rxq_stats_strings[i].offset +
-					q * sizeof(uint64_t));
+						rte_stats_strings[i].offset);
 			val = *stats_ptr;
-			xstats[count++].value = val;
+			values[count++] = val;
 		}
+
+		/* per-rxq stats */
+		for (q = 0; q < nb_rxqs; q++) {
+			for (i = 0; i < RTE_NB_RXQ_STATS; i++) {
+				stats_ptr = RTE_PTR_ADD(&eth_stats,
+					    rte_rxq_stats_strings[i].offset +
+					    q * sizeof(uint64_t));
+				val = *stats_ptr;
+				values[count++] = val;
+			}
+		}
+
+		/* per-txq stats */
+		for (q = 0; q < nb_txqs; q++) {
+			for (i = 0; i < RTE_NB_TXQ_STATS; i++) {
+				stats_ptr = RTE_PTR_ADD(&eth_stats,
+					    rte_txq_stats_strings[i].offset +
+					    q * sizeof(uint64_t));
+				val = *stats_ptr;
+				values[count++] = val;
+			}
+		}
+
+		return count + xcount;
 	}
+	/* Need only xstats given by IDS array */
+	else {
+		uint16_t i, size;
+		uint64_t *values_copy;
 
-	/* per-txq stats */
-	for (q = 0; q < nb_txqs; q++) {
-		for (i = 0; i < RTE_NB_TXQ_STATS; i++) {
-			stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_txq_stats_strings[i].offset +
-					q * sizeof(uint64_t));
-			val = *stats_ptr;
-			xstats[count++].value = val;
+		size = rte_eth_xstats_get_v1705(port_id, NULL, NULL, 0);
+
+		values_copy = malloc(sizeof(values_copy) * size);
+		if (!values_copy) {
+			RTE_PMD_DEBUG_TRACE(
+			    "ERROR: can't allocate memory for values_copy\n");
+			return -1;
 		}
+
+		rte_eth_xstats_get_v1705(port_id, NULL, values_copy, size);
+
+		for (i = 0; i < n; i++) {
+			if (ids[i] >= size) {
+				RTE_PMD_DEBUG_TRACE(
+					"ERROR: id value isn't valid\n");
+				return -1;
+			}
+			values[i] = values_copy[ids[i]];
+		}
+		free(values_copy);
+		return n;
 	}
+}
+MAP_STATIC_SYMBOL(int
+		rte_eth_xstats_get(uint8_t port_id, uint64_t *ids,
+		uint64_t *values, unsigned int n), rte_eth_xstats_get_v1705);
+
+__rte_deprecated int
+rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n)
+{
+	uint64_t *values_copy;
+	uint16_t size, i;
 
-	for (i = 0; i < count; i++)
+	values_copy = malloc(sizeof(values_copy) * n);
+	if (!values_copy) {
+		RTE_PMD_DEBUG_TRACE(
+				"ERROR: Cannot allocate memory for xstats\n");
+		return -1;
+	}
+	size = rte_eth_xstats_get(port_id, 0, values_copy, n);
+
+	for (i = 0; i < n; i++) {
 		xstats[i].id = i;
-	/* add an offset to driver-specific stats */
-	for ( ; i < count + xcount; i++)
-		xstats[i].id += count;
+		xstats[i].value = values_copy[i];
+	}
+	free(values_copy);
+	return size;
+}
 
-	return count + xcount;
+__rte_deprecated int
+rte_eth_xstats_get_names_all(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n)
+{
+	return rte_eth_xstats_get_names(port_id, xstats_names, n, NULL);
 }
 
 /* reset ethdev extended statistics */
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index d072538..e4f410a 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -186,6 +186,7 @@
 #include "rte_ether.h"
 #include "rte_eth_ctrl.h"
 #include "rte_dev_info.h"
+#include "rte_compat.h"
 
 struct rte_mbuf;
 
@@ -1118,6 +1119,10 @@ typedef int (*eth_xstats_get_t)(struct rte_eth_dev *dev,
 	struct rte_eth_xstat *stats, unsigned n);
 /**< @internal Get extended stats of an Ethernet device. */
 
+typedef int (*eth_xstats_get_by_ids_t)(struct rte_eth_dev *dev,
+		uint64_t *ids, uint64_t *values, unsigned int n);
+/**< @internal Get extended stats of an Ethernet device. */
+
 typedef void (*eth_xstats_reset_t)(struct rte_eth_dev *dev);
 /**< @internal Reset extended stats of an Ethernet device. */
 
@@ -1125,6 +1130,17 @@ typedef int (*eth_xstats_get_names_t)(struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, unsigned size);
 /**< @internal Get names of extended stats of an Ethernet device. */
 
+typedef int (*eth_xstats_get_names_by_ids_t)(struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+	unsigned int size);
+/**< @internal Get names of extended stats of an Ethernet device. */
+
+typedef int (*eth_xstats_get_by_name_t)(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names,
+		struct rte_eth_xstat *xstat,
+		const char *name);
+/**< @internal Get xstat specified by name of an Ethernet device. */
+
 typedef int (*eth_queue_stats_mapping_set_t)(struct rte_eth_dev *dev,
 					     uint16_t queue_id,
 					     uint8_t stat_idx,
@@ -1466,8 +1482,8 @@ struct eth_dev_ops {
 	eth_stats_reset_t          stats_reset;   /**< Reset generic device statistics. */
 	eth_xstats_get_t           xstats_get;    /**< Get extended device statistics. */
 	eth_xstats_reset_t         xstats_reset;  /**< Reset extended device statistics. */
-	eth_xstats_get_names_t     xstats_get_names;
-	/**< Get names of extended statistics. */
+	eth_xstats_get_names_t	   xstats_get_names;
+	/**< Get names of extended device statistics. */
 	eth_queue_stats_mapping_set_t queue_stats_mapping_set;
 	/**< Configure per queue stat counter mapping. */
 
@@ -1563,6 +1579,12 @@ struct eth_dev_ops {
 	eth_timesync_adjust_time   timesync_adjust_time; /** Adjust the device clock. */
 	eth_timesync_read_time     timesync_read_time; /** Get the device clock time. */
 	eth_timesync_write_time    timesync_write_time; /** Set the device clock time. */
+	eth_xstats_get_by_ids_t    xstats_get_by_ids;
+	/**< Get extended device statistics by ID. */
+	eth_xstats_get_names_by_ids_t xstats_get_names_by_ids;
+	/**< Get name of extended device statistics by ID. */
+	eth_xstats_get_by_name_t   xstats_get_by_name;
+	/**< Get extended device statistics by name. */
 };
 
 /**
@@ -2324,8 +2346,57 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  */
 void rte_eth_stats_reset(uint8_t port_id);
 
+
 /**
- * Retrieve names of extended statistics of an Ethernet device.
+* Gets the ID of a statistic from its name.
+*
+* Note this function searches for the statistics using string compares, and
+* as such should not be used on the fast-path. For fast-path retrieval of
+* specific statistics, store the ID as provided in *id* from this function,
+* and pass the ID to rte_eth_xstats_get()
+*
+* @param port_id The port to look up statistics from
+* @param xstat_name The name of the statistic to return
+* @param[out] id A pointer to an app-supplied uint64_t which should be
+*                set to the ID of the stat if the stat exists.
+* @return
+*    0 on success
+*    -ENODEV for invalid port_id,
+*    -EINVAL if the xstat_name doesn't exist in port_id
+*/
+int rte_eth_xstats_get_id_by_name(uint8_t port_id, const char *xstat_name,
+		uint64_t *id);
+
+/**
+ * Retrieve all extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats
+ *   A pointer to a table of structure of type *rte_eth_xstat*
+ *   to be filled with device statistics ids and values: id is the
+ *   index of the name string in xstats_names (see rte_eth_xstats_get_names()),
+ *   and value is the statistic counter.
+ *   This parameter can be set to NULL if n is 0.
+ * @param n
+ *   The size of the xstats array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+__rte_deprecated
+int rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n);
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get_all, _v1705, 17.05);
+
+
+/**
+ * Retrieve names of all extended statistics of an Ethernet device.
  *
  * @param port_id
  *   The port identifier of the Ethernet device.
@@ -2333,7 +2404,7 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  *   An rte_eth_xstat_name array of at least *size* elements to
  *   be filled. If set to NULL, the function returns the required number
  *   of elements.
- * @param size
+ * @param n
  *   The size of the xstats_names array (number of elements).
  * @return
  *   - A positive value lower or equal to size: success. The return value
@@ -2344,9 +2415,10 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  *     shall not be used by the caller.
  *   - A negative value on error (invalid port id).
  */
-int rte_eth_xstats_get_names(uint8_t port_id,
-		struct rte_eth_xstat_name *xstats_names,
-		unsigned size);
+__rte_deprecated int rte_eth_xstats_get_names_all(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n);
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get_names_all, _v1705, 17.05);
+
 
 /**
  * Retrieve extended statistics of an Ethernet device.
@@ -2370,8 +2442,94 @@ int rte_eth_xstats_get_names(uint8_t port_id,
  *     shall not be used by the caller.
  *   - A negative value on error (invalid port id).
  */
-int rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
-		unsigned n);
+int rte_eth_xstats_get_v22(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n);
+
+/**
+ * Retrieve extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param ids
+ *   A pointer to an ids array passed by application. This tells wich
+ *   statistics values function should retrieve. This parameter
+ *   can be set to NULL if n is 0. In this case function will retrieve
+ *   all avalible statistics.
+ * @param values
+ *   A pointer to a table to be filled with device statistics values.
+ * @param n
+ *   The size of the ids array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_v1705(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n);
+
+int rte_eth_xstats_get(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n);
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get, _v1705, 17.05);
+
+/**
+ * Retrieve extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats_names
+ *   A pointer to a table of structure of type *rte_eth_xstat*
+ *   to be filled with device statistics ids and values: id is the
+ *   index of the name string in xstats_names (see rte_eth_xstats_get_names()),
+ *   and value is the statistic counter.
+ *   This parameter can be set to NULL if n is 0.
+ * @param n
+ *   The size of the xstats array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_names_v1607(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n);
+
+/**
+ * Retrieve names of extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats_names
+ *   An rte_eth_xstat_name array of at least *size* elements to
+ *   be filled. If set to NULL, the function returns the required number
+ *   of elements.
+ * @param ids
+ *   IDs array given by app to retrieve specific statistics
+ * @param size
+ *   The size of the xstats_names array (number of elements).
+ * @return
+ *   - A positive value lower or equal to size: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than size: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_names_v1705(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, unsigned int size,
+	uint64_t *ids);
+
+int rte_eth_xstats_get_names(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, unsigned int size,
+	uint64_t *ids);
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get_names, _v1705, 17.05);
 
 /**
  * Reset extended statistics of an Ethernet device.
diff --git a/lib/librte_ether/rte_ether_version.map b/lib/librte_ether/rte_ether_version.map
index 0ea3856..f4d0136 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -159,5 +159,10 @@ DPDK_17.05 {
 	global:
 
 	rte_eth_find_next;
+	rte_eth_xstats_get_names;
+	rte_eth_xstats_get;
+	rte_eth_xstats_get_all;
+	rte_eth_xstats_get_names_all;
+	rte_eth_xstats_get_id_by_name;
 
 } DPDK_17.02;
-- 
1.9.1

[PATCH v5 0/3] Extended xstats API in ethdev library to allow grouping of stats

[Michal Jastrzebski]

From: Jacek Piasecki <jacekx.piasecki@intel.com>

Extended xstats API in ethdev library to allow grouping of stats logically
so they can be retrieved per logical grouping  managed by the application.
Changed existing functions rte_eth_xstats_get_names and rte_eth_xstats_get
to use a new list of arguments: array of ids and array of values.
ABI versioning mechanism was used to support backward compatibility.
Introduced two new functions rte_eth_xstats_get_all and
rte_eth_xstats_get_names_all which keeps functionality of the previous
ones (respectively rte_eth_xstats_get and rte_eth_xstats_get_names)
but use new API inside. Both functions marked as deprecated. 
Introduced new function: rte_eth_xstats_get_id_by_name to retrieve
xstats ids by its names.
Extended functionality of proc_info application:
--xstats-name NAME: to display single xstat value by NAME
Updated test-pmd application to use new API.

v5 changes:
* fix clang shared build compilation
* remove wrong versioning macros
* Makefile LIBABIVER 6 change 

v4 changes:
* documentation change after API modification
* fix xstats display for PMD without _by_ids() functions
* fix ABI validator errors

v3 changes:
* checkpatch fixes
* removed malloc bug in ethdev
* add new command to proc_info and IDs parsing
* merged testpmd and proc_info patch with library patch

Jacek Piasecki (3):
  ethdev: new xstats API add retrieving by ID
  net/e1000: new xstats API add ID support for e1000
  net/ixgbe: new xstats API add ID support for ixgbe

 app/proc_info/main.c                    | 150 ++++++++++-
 app/test-pmd/config.c                   |  19 +-
 doc/guides/prog_guide/poll_mode_drv.rst | 174 +++++++++++--
 drivers/net/e1000/igb_ethdev.c          |  92 ++++++-
 drivers/net/ixgbe/ixgbe_ethdev.c        | 179 +++++++++++++
 lib/librte_ether/rte_ethdev.c           | 430 ++++++++++++++++++++++++--------
 lib/librte_ether/rte_ethdev.h           | 170 ++++++++++++-
 lib/librte_ether/rte_ether_version.map  |   5 +
 8 files changed, 1063 insertions(+), 156 deletions(-)

-- 
1.9.1

[PATCH v5 1/3] ethdev: new xstats API add retrieving by ID

[Michal Jastrzebski]

From: Jacek Piasecki <jacekx.piasecki@intel.com>

Extended xstats API in ethdev library to allow grouping of stats
logically so they can be retrieved per logical grouping  managed
by the application.
Changed existing functions rte_eth_xstats_get_names and
rte_eth_xstats_get to use a new list of arguments: array of ids
and array of values. ABI versioning mechanism was used to
support backward compatibility.
Introduced two new functions rte_eth_xstats_get_all and
rte_eth_xstats_get_names_all which keeps functionality of the
previous ones (respectively rte_eth_xstats_get and
rte_eth_xstats_get_names) but use new API inside.
Both functions marked as deprecated.
Introduced new function: rte_eth_xstats_get_id_by_name
to retrieve xstats ids by its names.

test-pmd: add support for new xstats API retrieving by id in
testpmd application: xstats_get() and
xstats_get_names() call with modified parameters.

proc_info: add support for new xstats API retrieving by id to
proc_info application. There is a new argument --xstats-ids
in proc_info command line to retrieve statistics given by ids.
E.g. --xstats-ids="1,3,5,7,8"

doc: add description for modified xstats API
Documentation change for modified extended statistics API functions.
The old API only allows retrieval of *all* of the NIC statistics
at once. Given this requires a MMIO read PCI transaction per statistic
it is an inefficient way of retrieving just a few key statistics.
Often a monitoring agent only has an interest in a few key statistics,
and the old API forces wasting CPU time and PCIe bandwidth in retrieving
*all* statistics; even those that the application didn't explicitly
show an interest in.
The new, more flexible API allow retrieval of statistics per ID.
If a PMD wishes, it can be implemented to read just the required
NIC registers. As a result, the monitoring application no longer wastes
PCIe bandwidth and CPU time.

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>
---
 app/proc_info/main.c                    | 150 ++++++++++-
 app/test-pmd/config.c                   |  19 +-
 doc/guides/prog_guide/poll_mode_drv.rst | 174 +++++++++++--
 lib/librte_ether/rte_ethdev.c           | 430 ++++++++++++++++++++++++--------
 lib/librte_ether/rte_ethdev.h           | 170 ++++++++++++-
 lib/librte_ether/rte_ether_version.map  |   5 +
 6 files changed, 794 insertions(+), 154 deletions(-)

diff --git a/app/proc_info/main.c b/app/proc_info/main.c
index d576b42..d0eae4b 100644
--- a/app/proc_info/main.c
+++ b/app/proc_info/main.c
@@ -86,6 +86,14 @@
 static uint32_t reset_xstats;
 /**< Enable memory info. */
 static uint32_t mem_info;
+/**< Enable displaying xstat name. */
+static uint32_t enable_xstats_name;
+static char *xstats_name;
+
+/**< Enable xstats by ids. */
+#define MAX_NB_XSTATS_IDS 1024
+static uint32_t nb_xstats_ids;
+static uint64_t xstats_ids[MAX_NB_XSTATS_IDS];
 
 /**< display usage */
 static void
@@ -97,8 +105,9 @@
 		"  --stats: to display port statistics, enabled by default\n"
 		"  --xstats: to display extended port statistics, disabled by "
 			"default\n"
-		"  --metrics: to display derived metrics of the ports, disabled by "
-			"default\n"
+		"  --xstats-name NAME: to display single xstat value by NAME\n"
+		"  --xstats-ids IDLIST: to display xstat values by id. "
+			"The argument is comma-separated list of xstat ids to print out.\n"
 		"  --stats-reset: to reset port statistics\n"
 		"  --xstats-reset: to reset port extended statistics\n"
 		"  --collectd-format: to print statistics to STDOUT in expected by collectd format\n"
@@ -132,6 +141,33 @@
 
 }
 
+/*
+ * Parse ids value list into array
+ */
+static int
+parse_xstats_ids(char *list, uint64_t *ids, int limit) {
+	int length;
+	char *token;
+	char *ctx = NULL;
+	char *endptr;
+
+	length = 0;
+	token = strtok_r(list, ",", &ctx);
+	while (token != NULL) {
+		ids[length] = strtoull(token, &endptr, 10);
+		if (*endptr != '\0')
+			return -EINVAL;
+
+		length++;
+		if (length >= limit)
+			return -E2BIG;
+
+		token = strtok_r(NULL, ",", &ctx);
+	}
+
+	return length;
+}
+
 static int
 proc_info_preparse_args(int argc, char **argv)
 {
@@ -178,7 +214,9 @@
 		{"xstats", 0, NULL, 0},
 		{"metrics", 0, NULL, 0},
 		{"xstats-reset", 0, NULL, 0},
+		{"xstats-name", required_argument, NULL, 1},
 		{"collectd-format", 0, NULL, 0},
+		{"xstats-ids", 1, NULL, 1},
 		{"host-id", 0, NULL, 0},
 		{NULL, 0, 0, 0}
 	};
@@ -224,7 +262,28 @@
 					MAX_LONG_OPT_SZ))
 				reset_xstats = 1;
 			break;
+		case 1:
+			/* Print xstat single value given by name*/
+			if (!strncmp(long_option[option_index].name,
+					"xstats-name", MAX_LONG_OPT_SZ)) {
+				enable_xstats_name = 1;
+				xstats_name = optarg;
+				printf("name:%s:%s\n",
+						long_option[option_index].name,
+						optarg);
+			} else if (!strncmp(long_option[option_index].name,
+					"xstats-ids",
+					MAX_LONG_OPT_SZ))	{
+				nb_xstats_ids = parse_xstats_ids(optarg,
+						xstats_ids, MAX_NB_XSTATS_IDS);
+
+				if (nb_xstats_ids <= 0) {
+					printf("xstats-id list parse error.\n");
+					return -1;
+				}
 
+			}
+			break;
 		default:
 			proc_info_usage(prgname);
 			return -1;
@@ -351,20 +410,82 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 }
 
 static void
+nic_xstats_by_name_display(uint8_t port_id, char *name)
+{
+	uint64_t id;
+
+	printf("###### NIC statistics for port %-2d, statistic name '%s':\n",
+			   port_id, name);
+
+	if (rte_eth_xstats_get_id_by_name(port_id, name, &id) == 0)
+		printf("%s: %"PRIu64"\n", name, id);
+	else
+		printf("Statistic not found...\n");
+
+}
+
+static void
+nic_xstats_by_ids_display(uint8_t port_id, uint64_t *ids, int len)
+{
+	struct rte_eth_xstat_name *xstats_names;
+	uint64_t *values;
+	int ret, i;
+	static const char *nic_stats_border = "########################";
+
+	values = malloc(sizeof(values) * len);
+	if (values == NULL) {
+		printf("Cannot allocate memory for xstats\n");
+		return;
+	}
+
+	xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
+	if (xstats_names == NULL) {
+		printf("Cannot allocate memory for xstat names\n");
+		free(values);
+		return;
+	}
+
+	if (len != rte_eth_xstats_get_names(
+			port_id, xstats_names, len, ids)) {
+		printf("Cannot get xstat names\n");
+		goto err;
+	}
+
+	printf("###### NIC extended statistics for port %-2d #########\n",
+			   port_id);
+	printf("%s############################\n", nic_stats_border);
+	ret = rte_eth_xstats_get(port_id, ids, values, len);
+	if (ret < 0 || ret > len) {
+		printf("Cannot get xstats\n");
+		goto err;
+	}
+
+	for (i = 0; i < len; i++)
+		printf("%s: %"PRIu64"\n",
+			xstats_names[i].name,
+			values[i]);
+
+	printf("%s############################\n", nic_stats_border);
+err:
+	free(values);
+	free(xstats_names);
+}
+
+static void
 nic_xstats_display(uint8_t port_id)
 {
 	struct rte_eth_xstat_name *xstats_names;
-	struct rte_eth_xstat *xstats;
+	uint64_t *values;
 	int len, ret, i;
 	static const char *nic_stats_border = "########################";
 
-	len = rte_eth_xstats_get_names(port_id, NULL, 0);
+	len = rte_eth_xstats_get_names(port_id, NULL, 0, NULL);
 	if (len < 0) {
 		printf("Cannot get xstats count\n");
 		return;
 	}
-	xstats = malloc(sizeof(xstats[0]) * len);
-	if (xstats == NULL) {
+	values = malloc(sizeof(values) * len);
+	if (values == NULL) {
 		printf("Cannot allocate memory for xstats\n");
 		return;
 	}
@@ -372,11 +493,11 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 	xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
 	if (xstats_names == NULL) {
 		printf("Cannot allocate memory for xstat names\n");
-		free(xstats);
+		free(values);
 		return;
 	}
 	if (len != rte_eth_xstats_get_names(
-			port_id, xstats_names, len)) {
+			port_id, xstats_names, len, NULL)) {
 		printf("Cannot get xstat names\n");
 		goto err;
 	}
@@ -385,7 +506,7 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 			   port_id);
 	printf("%s############################\n",
 			   nic_stats_border);
-	ret = rte_eth_xstats_get(port_id, xstats, len);
+	ret = rte_eth_xstats_get(port_id, NULL, values, len);
 	if (ret < 0 || ret > len) {
 		printf("Cannot get xstats\n");
 		goto err;
@@ -401,18 +522,18 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 						  xstats_names[i].name);
 			sprintf(buf, "PUTVAL %s/dpdkstat-port.%u/%s-%s N:%"
 				PRIu64"\n", host_id, port_id, counter_type,
-				xstats_names[i].name, xstats[i].value);
+				xstats_names[i].name, values[i]);
 			write(stdout_fd, buf, strlen(buf));
 		} else {
 			printf("%s: %"PRIu64"\n", xstats_names[i].name,
-			       xstats[i].value);
+					values[i]);
 		}
 	}
 
 	printf("%s############################\n",
 			   nic_stats_border);
 err:
-	free(xstats);
+	free(values);
 	free(xstats_names);
 }
 
@@ -551,6 +672,11 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 				nic_stats_clear(i);
 			else if (reset_xstats)
 				nic_xstats_clear(i);
+			else if (enable_xstats_name)
+				nic_xstats_by_name_display(i, xstats_name);
+			else if (nb_xstats_ids > 0)
+				nic_xstats_by_ids_display(i, xstats_ids,
+						nb_xstats_ids);
 			else if (enable_metrics)
 				metrics_display(i);
 		}
diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 4d873cd..ef07925 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -264,9 +264,9 @@ struct rss_type_info {
 void
 nic_xstats_display(portid_t port_id)
 {
-	struct rte_eth_xstat *xstats;
 	int cnt_xstats, idx_xstat;
 	struct rte_eth_xstat_name *xstats_names;
+	uint64_t *values;
 
 	printf("###### NIC extended statistics for port %-2d\n", port_id);
 	if (!rte_eth_dev_is_valid_port(port_id)) {
@@ -275,7 +275,7 @@ struct rss_type_info {
 	}
 
 	/* Get count */
-	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, 0);
+	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, 0, NULL);
 	if (cnt_xstats  < 0) {
 		printf("Error: Cannot get count of xstats\n");
 		return;
@@ -288,23 +288,24 @@ struct rss_type_info {
 		return;
 	}
 	if (cnt_xstats != rte_eth_xstats_get_names(
-			port_id, xstats_names, cnt_xstats)) {
+			port_id, xstats_names, cnt_xstats, NULL)) {
 		printf("Error: Cannot get xstats lookup\n");
 		free(xstats_names);
 		return;
 	}
 
 	/* Get stats themselves */
-	xstats = malloc(sizeof(struct rte_eth_xstat) * cnt_xstats);
-	if (xstats == NULL) {
+	values = malloc(sizeof(values) * cnt_xstats);
+	if (values == NULL) {
 		printf("Cannot allocate memory for xstats\n");
 		free(xstats_names);
 		return;
 	}
-	if (cnt_xstats != rte_eth_xstats_get(port_id, xstats, cnt_xstats)) {
+	if (cnt_xstats != rte_eth_xstats_get(port_id, NULL, values,
+			cnt_xstats)) {
 		printf("Error: Unable to get xstats\n");
 		free(xstats_names);
-		free(xstats);
+		free(values);
 		return;
 	}
 
@@ -312,9 +313,9 @@ struct rss_type_info {
 	for (idx_xstat = 0; idx_xstat < cnt_xstats; idx_xstat++)
 		printf("%s: %"PRIu64"\n",
 			xstats_names[idx_xstat].name,
-			xstats[idx_xstat].value);
+			values[idx_xstat]);
 	free(xstats_names);
-	free(xstats);
+	free(values);
 }
 
 void
diff --git a/doc/guides/prog_guide/poll_mode_drv.rst b/doc/guides/prog_guide/poll_mode_drv.rst
index e48c121..3372f30 100644
--- a/doc/guides/prog_guide/poll_mode_drv.rst
+++ b/doc/guides/prog_guide/poll_mode_drv.rst
@@ -334,24 +334,20 @@ The Ethernet device API exported by the Ethernet PMDs is described in the *DPDK
 Extended Statistics API
 ~~~~~~~~~~~~~~~~~~~~~~~
 
-The extended statistics API allows each individual PMD to expose a unique set
-of statistics. Accessing these from application programs is done via two
-functions:
-
-* ``rte_eth_xstats_get``: Fills in an array of ``struct rte_eth_xstat``
-  with extended statistics.
-* ``rte_eth_xstats_get_names``: Fills in an array of
-  ``struct rte_eth_xstat_name`` with extended statistic name lookup
-  information.
-
-Each ``struct rte_eth_xstat`` contains an identifier and value pair, and
-each ``struct rte_eth_xstat_name`` contains a string. Each identifier
-within the ``struct rte_eth_xstat`` lookup array must have a corresponding
-entry in the ``struct rte_eth_xstat_name`` lookup array. Within the latter
-the index of the entry is the identifier the string is associated with.
-These identifiers, as well as the number of extended statistic exposed, must
-remain constant during runtime. Note that extended statistic identifiers are
-driver-specific, and hence might not be the same for different ports.
+The extended statistics API allows a PMD to expose all statistics that are
+available to it, including statistics that are unique to the device.
+Each statistic has three properties ``name``, ``id`` and ``value``:
+
+* ``name``: A human readable string formatted by the scheme detailed below.
+* ``id``: An integer that represents only that statistic.
+* ``value``: A unsigned 64-bit integer that is the value of the statistic.
+
+The API consists of various ``rte_eth_xstats_*()`` functions, and allows an
+application to be flexible in how it retrieves statistics.
+
+
+Scheme for Human Readable Names
+_______________________________
 
 A naming scheme exists for the strings exposed to clients of the API. This is
 to allow scraping of the API for statistics of interest. The naming scheme uses
@@ -363,8 +359,8 @@ strings split by a single underscore ``_``. The scheme is as follows:
 * detail n
 * unit
 
-Examples of common statistics xstats strings, formatted to comply to the scheme
-proposed above:
+Examples of common statistics xstats strings, formatted to comply to the
+above scheme:
 
 * ``rx_bytes``
 * ``rx_crc_errors``
@@ -378,7 +374,7 @@ associated with the receive side of the NIC.  The second component ``packets``
 indicates that the unit of measure is packets.
 
 A more complicated example: ``tx_size_128_to_255_packets``. In this example,
-``tx`` indicates transmission, ``size``  is the first detail, ``128`` etc are
+``tx`` indicates transmission, ``size``  is the first detail, ``128`` etc. are
 more details, and ``packets`` indicates that this is a packet counter.
 
 Some additions in the metadata scheme are as follows:
@@ -392,3 +388,139 @@ Some additions in the metadata scheme are as follows:
 An example where queue numbers are used is as follows: ``tx_q7_bytes`` which
 indicates this statistic applies to queue number 7, and represents the number
 of transmitted bytes on that queue.
+
+API Design
+__________
+
+The xstats API uses the ``name``, ``id``, and ``value`` to allow performant
+lookup of specific statistics. Performant lookup means two things;
+
+* No string comparisons with the ``name`` of the statistic in fast-path
+* Allow requesting of only the statistics of interest
+
+The API ensures these requirements are met by mapping the ``name`` of the
+statistic to a unique ``id``, which is used as a key for lookup in the fast-path.
+The API allows applications to request an array of ``id`` values, so that the
+PMD only performs the required calculations. Expected usage is that the
+application scans the ``name`` of each statistic, and caches the ``id``
+if it has an interest in that statistic. On the fast-path, the integer can be used
+to retrieve the actual ``value`` of the statistic that the ``id`` represents.
+
+API Functions
+_____________
+
+The API is built out of a small number of functions, which can be used to
+retrieve the number of statistics and the names, IDs and values of those
+statistics.
+
+* ``rte_eth_xstats_get_names()``: returns the names of the statistics. When given a
+  ``NULL`` parameter the function returns the number of statistics that are available.
+
+* ``rte_eth_xstats_get_id_by_name()``: Searches for the statistic ID that matches
+  ``xstat_name``. If found, the ``id`` integer is set.
+
+* ``rte_eth_xstats_get()``: Fills in an array of ``uint64_t`` values
+  with matching the provided ``ids`` array. If the ``ids`` array is NULL, it
+  returns all statistics that are available.
+
+
+Application Usage
+_________________
+
+Imagine an application that wants to view the dropped packet count. If no
+packets are dropped, the application does not read any other metrics for
+performance reasons. If packets are dropped, the application has a particular
+set of statistics that it requests. This "set" of statistics allows the app to
+decide what next steps to perform. The following code-snippets show how the
+xstats API can be used to achieve this goal.
+
+First step is to get all statistics names and list them:
+
+.. code-block:: c
+
+    struct rte_eth_xstat_name *xstats_names;
+    uint64_t *values;
+    int len, i;
+
+    /* Get number of stats */
+    len = rte_eth_xstats_get_names(port_id, NULL, NULL, 0);
+    if (len < 0) {
+        printf("Cannot get xstats count\n");
+        goto err;
+    }
+
+    xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
+    if (xstats_names == NULL) {
+        printf("Cannot allocate memory for xstat names\n");
+        goto err;
+    }
+
+    /* Retrieve xstats names, passing NULL for IDs to return all statistics */
+    if (len != rte_eth_xstats_get_names(port_id, xstats_names, NULL, len)) {
+        printf("Cannot get xstat names\n");
+        goto err;
+    }
+
+    values = malloc(sizeof(values) * len);
+    if (values == NULL) {
+        printf("Cannot allocate memory for xstats\n");
+        goto err;
+    }
+
+    /* Getting xstats values */
+    if (len != rte_eth_xstats_get(port_id, NULL, values, len)) {
+        printf("Cannot get xstat values\n");
+        goto err;
+    }
+
+    /* Print all xstats names and values */
+    for (i = 0; i < len; i++) {
+        printf("%s: %"PRIu64"\n", xstats_names[i].name, values[i]);
+    }
+
+The application has access to the names of all of the statistics that the PMD
+exposes. The application can decide which statistics are of interest, cache the
+ids of those statistics by looking up the name as follows:
+
+.. code-block:: c
+
+    uint64_t id;
+    uint64_t value;
+    const char *xstat_name = "rx_errors";
+
+    if(!rte_eth_xstats_get_id_by_name(port_id, xstat_name, &id)) {
+        rte_eth_xstats_get(port_id, &id, &value, 1);
+        printf("%s: %"PRIu64"\n", xstat_name, value);
+    }
+    else {
+        printf("Cannot find xstats with a given name\n");
+        goto err;
+    }
+
+The API provides flexibility to the application so that it can look up multiple
+statistics using an array containing multiple ``id`` numbers. This reduces the
+function call overhead of retrieving statistics, and makes lookup of multiple
+statistics simpler for the application.
+
+.. code-block:: c
+
+    #define APP_NUM_STATS 4
+    /* application cached these ids previously; see above */
+    uint64_t ids_array[APP_NUM_STATS] = {3,4,7,21};
+    uint64_t value_array[APP_NUM_STATS];
+
+    /* Getting multiple xstats values from array of IDs */
+    rte_eth_xstats_get(port_id, ids_array, value_array, APP_NUM_STATS);
+
+    uint32_t i;
+    for(i = 0; i < APP_NUM_STATS; i++) {
+        printf("%d: %"PRIu64"\n", ids_array[i], value_array[i]);
+    }
+
+
+This array lookup API for xstats allows the application create multiple
+"groups" of statistics, and look up the values of those IDs using a single API
+call. As an end result, the application is able to achieve its goal of
+monitoring a single statistic ("rx_errors" in this case), and if that shows
+packets being dropped, it can easily retrieve a "set" of statistics using the
+IDs array parameter to ``rte_eth_xstats_get`` function.
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 4e1e6dc..0653cf7 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1454,12 +1454,19 @@ struct rte_eth_dev *
 
 	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
 	dev = &rte_eth_devices[port_id];
+	if (dev->dev_ops->xstats_get_names_by_ids != NULL) {
+		count = (*dev->dev_ops->xstats_get_names_by_ids)(dev, NULL,
+				NULL, 0);
+		if (count < 0)
+			return count;
+	}
 	if (dev->dev_ops->xstats_get_names != NULL) {
 		count = (*dev->dev_ops->xstats_get_names)(dev, NULL, 0);
 		if (count < 0)
 			return count;
 	} else
 		count = 0;
+
 	count += RTE_NB_STATS;
 	count += RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS) *
 		 RTE_NB_RXQ_STATS;
@@ -1469,150 +1476,367 @@ struct rte_eth_dev *
 }
 
 int
-rte_eth_xstats_get_names(uint8_t port_id,
-	struct rte_eth_xstat_name *xstats_names,
-	unsigned size)
+rte_eth_xstats_get_id_by_name(uint8_t port_id, const char *xstat_name,
+		uint64_t *id)
 {
-	struct rte_eth_dev *dev;
-	int cnt_used_entries;
-	int cnt_expected_entries;
-	int cnt_driver_entries;
-	uint32_t idx, id_queue;
-	uint16_t num_q;
+	int cnt_xstats, idx_xstat;
 
-	cnt_expected_entries = get_xstats_count(port_id);
-	if (xstats_names == NULL || cnt_expected_entries < 0 ||
-			(int)size < cnt_expected_entries)
-		return cnt_expected_entries;
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
 
-	/* port_id checked in get_xstats_count() */
-	dev = &rte_eth_devices[port_id];
-	cnt_used_entries = 0;
+	if (!id) {
+		RTE_PMD_DEBUG_TRACE("Error: id pointer is NULL\n");
+		return -1;
+	}
 
-	for (idx = 0; idx < RTE_NB_STATS; idx++) {
-		snprintf(xstats_names[cnt_used_entries].name,
-			sizeof(xstats_names[0].name),
-			"%s", rte_stats_strings[idx].name);
-		cnt_used_entries++;
+	if (!xstat_name) {
+		RTE_PMD_DEBUG_TRACE("Error: xstat_name pointer is NULL\n");
+		return -1;
 	}
-	num_q = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	for (id_queue = 0; id_queue < num_q; id_queue++) {
-		for (idx = 0; idx < RTE_NB_RXQ_STATS; idx++) {
+
+	/* Get count */
+	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, 0, NULL);
+	if (cnt_xstats  < 0) {
+		RTE_PMD_DEBUG_TRACE("Error: Cannot get count of xstats\n");
+		return -1;
+	}
+
+	/* Get id-name lookup table */
+	struct rte_eth_xstat_name xstats_names[cnt_xstats];
+
+	if (cnt_xstats != rte_eth_xstats_get_names(
+			port_id, xstats_names, cnt_xstats, NULL)) {
+		RTE_PMD_DEBUG_TRACE("Error: Cannot get xstats lookup\n");
+		return -1;
+	}
+
+	for (idx_xstat = 0; idx_xstat < cnt_xstats; idx_xstat++) {
+		if (!strcmp(xstats_names[idx_xstat].name, xstat_name)) {
+			*id = idx_xstat;
+			return 0;
+		};
+	}
+
+	return -EINVAL;
+}
+
+int
+rte_eth_xstats_get_names_v1607(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names,
+	unsigned int size)
+{
+	return rte_eth_xstats_get_names(port_id, xstats_names, size, NULL);
+}
+VERSION_SYMBOL(rte_eth_xstats_get_names, _v1607, 16.07);
+
+int
+rte_eth_xstats_get_names_v1705(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, unsigned int size,
+	uint64_t *ids)
+{
+	/* Get all xstats */
+	if (!ids) {
+		struct rte_eth_dev *dev;
+		int cnt_used_entries;
+		int cnt_expected_entries;
+		int cnt_driver_entries;
+		uint32_t idx, id_queue;
+		uint16_t num_q;
+
+		cnt_expected_entries = get_xstats_count(port_id);
+		if (xstats_names == NULL || cnt_expected_entries < 0 ||
+				(int)size < cnt_expected_entries)
+			return cnt_expected_entries;
+
+		/* port_id checked in get_xstats_count() */
+		dev = &rte_eth_devices[port_id];
+		cnt_used_entries = 0;
+
+		for (idx = 0; idx < RTE_NB_STATS; idx++) {
 			snprintf(xstats_names[cnt_used_entries].name,
 				sizeof(xstats_names[0].name),
-				"rx_q%u%s",
-				id_queue, rte_rxq_stats_strings[idx].name);
+				"%s", rte_stats_strings[idx].name);
 			cnt_used_entries++;
 		}
+		num_q = RTE_MIN(dev->data->nb_rx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		for (id_queue = 0; id_queue < num_q; id_queue++) {
+			for (idx = 0; idx < RTE_NB_RXQ_STATS; idx++) {
+				snprintf(xstats_names[cnt_used_entries].name,
+					sizeof(xstats_names[0].name),
+					"rx_q%u%s",
+					id_queue,
+					rte_rxq_stats_strings[idx].name);
+				cnt_used_entries++;
+			}
+
+		}
+		num_q = RTE_MIN(dev->data->nb_tx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		for (id_queue = 0; id_queue < num_q; id_queue++) {
+			for (idx = 0; idx < RTE_NB_TXQ_STATS; idx++) {
+				snprintf(xstats_names[cnt_used_entries].name,
+					sizeof(xstats_names[0].name),
+					"tx_q%u%s",
+					id_queue,
+					rte_txq_stats_strings[idx].name);
+				cnt_used_entries++;
+			}
+		}
+
+		if (dev->dev_ops->xstats_get_names_by_ids != NULL) {
+			/* If there are any driver-specific xstats, append them
+			 * to end of list.
+			 */
+			cnt_driver_entries =
+				(*dev->dev_ops->xstats_get_names_by_ids)(
+				dev,
+				xstats_names + cnt_used_entries,
+				NULL,
+				size - cnt_used_entries);
+			if (cnt_driver_entries < 0)
+				return cnt_driver_entries;
+			cnt_used_entries += cnt_driver_entries;
+
+		} else if (dev->dev_ops->xstats_get_names != NULL) {
+			/* If there are any driver-specific xstats, append them
+			 * to end of list.
+			 */
+			cnt_driver_entries = (*dev->dev_ops->xstats_get_names)(
+				dev,
+				xstats_names + cnt_used_entries,
+				size - cnt_used_entries);
+			if (cnt_driver_entries < 0)
+				return cnt_driver_entries;
+			cnt_used_entries += cnt_driver_entries;
+		}
 
+		return cnt_used_entries;
 	}
-	num_q = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	for (id_queue = 0; id_queue < num_q; id_queue++) {
-		for (idx = 0; idx < RTE_NB_TXQ_STATS; idx++) {
-			snprintf(xstats_names[cnt_used_entries].name,
-				sizeof(xstats_names[0].name),
-				"tx_q%u%s",
-				id_queue, rte_txq_stats_strings[idx].name);
-			cnt_used_entries++;
+	/* Get only xstats given by IDS */
+	else {
+		uint16_t len, i;
+		struct rte_eth_xstat_name *xstats_names_copy;
+
+		len = rte_eth_xstats_get_names_v1705(port_id, NULL, 0, NULL);
+
+		xstats_names_copy =
+				malloc(sizeof(struct rte_eth_xstat_name) * len);
+		if (!xstats_names_copy) {
+			RTE_PMD_DEBUG_TRACE(
+			     "ERROR: can't allocate memory for values_copy\n");
+			free(xstats_names_copy);
+			return -1;
 		}
+
+		rte_eth_xstats_get_names_v1705(port_id, xstats_names_copy,
+				len, NULL);
+
+		for (i = 0; i < size; i++) {
+			if (ids[i] >= len) {
+				RTE_PMD_DEBUG_TRACE(
+					"ERROR: id value isn't valid\n");
+				return -1;
+			}
+			strcpy(xstats_names[i].name,
+					xstats_names_copy[ids[i]].name);
+		}
+		free(xstats_names_copy);
+		return size;
 	}
+}
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get_names, _v1705, 17.05);
 
-	if (dev->dev_ops->xstats_get_names != NULL) {
-		/* If there are any driver-specific xstats, append them
-		 * to end of list.
-		 */
-		cnt_driver_entries = (*dev->dev_ops->xstats_get_names)(
-			dev,
-			xstats_names + cnt_used_entries,
-			size - cnt_used_entries);
-		if (cnt_driver_entries < 0)
-			return cnt_driver_entries;
-		cnt_used_entries += cnt_driver_entries;
+MAP_STATIC_SYMBOL(int
+		rte_eth_xstats_get_names(uint8_t port_id,
+			struct rte_eth_xstat_name *xstats_names,
+			unsigned int size,
+			uint64_t *ids), rte_eth_xstats_get_names_v1705);
+
+/* retrieve ethdev extended statistics */
+int
+rte_eth_xstats_get_v22(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n)
+{
+	uint64_t *values_copy;
+	uint16_t size, i;
+
+	values_copy = malloc(sizeof(values_copy) * n);
+	if (!values_copy) {
+		RTE_PMD_DEBUG_TRACE(
+				"ERROR: Cannot allocate memory for xstats\n");
+		return -1;
 	}
+	size = rte_eth_xstats_get(port_id, 0, values_copy, n);
 
-	return cnt_used_entries;
+	for (i = 0; i < n; i++) {
+		xstats[i].id = i;
+		xstats[i].value = values_copy[i];
+	}
+	free(values_copy);
+	return size;
 }
+VERSION_SYMBOL(rte_eth_xstats_get, _v22, 2.2);
 
 /* retrieve ethdev extended statistics */
 int
-rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
-	unsigned n)
+rte_eth_xstats_get_v1705(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n)
 {
-	struct rte_eth_stats eth_stats;
-	struct rte_eth_dev *dev;
-	unsigned count = 0, i, q;
-	signed xcount = 0;
-	uint64_t val, *stats_ptr;
-	uint16_t nb_rxqs, nb_txqs;
+	/* If need all xstats */
+	if (!ids) {
+		struct rte_eth_stats eth_stats;
+		struct rte_eth_dev *dev;
+		unsigned int count = 0, i, q;
+		signed int xcount = 0;
+		uint64_t val, *stats_ptr;
+		uint16_t nb_rxqs, nb_txqs;
 
-	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
+		RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+		dev = &rte_eth_devices[port_id];
 
-	dev = &rte_eth_devices[port_id];
+		nb_rxqs = RTE_MIN(dev->data->nb_rx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		nb_txqs = RTE_MIN(dev->data->nb_tx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
 
-	nb_rxqs = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	nb_txqs = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		/* Return generic statistics */
+		count = RTE_NB_STATS + (nb_rxqs * RTE_NB_RXQ_STATS) +
+			(nb_txqs * RTE_NB_TXQ_STATS);
 
-	/* Return generic statistics */
-	count = RTE_NB_STATS + (nb_rxqs * RTE_NB_RXQ_STATS) +
-		(nb_txqs * RTE_NB_TXQ_STATS);
 
-	/* implemented by the driver */
-	if (dev->dev_ops->xstats_get != NULL) {
-		/* Retrieve the xstats from the driver at the end of the
-		 * xstats struct.
-		 */
-		xcount = (*dev->dev_ops->xstats_get)(dev,
-				     xstats ? xstats + count : NULL,
-				     (n > count) ? n - count : 0);
+		/* implemented by the driver */
+		if (dev->dev_ops->xstats_get_by_ids != NULL) {
+			/* Retrieve the xstats from the driver at the end of the
+			 * xstats struct. Retrieve all xstats.
+			 */
+			xcount = (*dev->dev_ops->xstats_get_by_ids)(dev,
+					NULL,
+					values ? values + count : NULL,
+					(n > count) ? n - count : 0);
+
+			if (xcount < 0)
+				return xcount;
+		/* implemented by the driver */
+		} else if (dev->dev_ops->xstats_get != NULL) {
+			/* Retrieve the xstats from the driver at the end of the
+			 * xstats struct. Retrieve all xstats.
+			 * Compatibility for PMD without xstats_get_by_ids
+			 */
+			unsigned int size = (n > count) ? n - count : 1;
+			struct rte_eth_xstat xstats[size];
 
-		if (xcount < 0)
-			return xcount;
-	}
+			xcount = (*dev->dev_ops->xstats_get)(dev,
+					values ? xstats : NULL,	size);
 
-	if (n < count + xcount || xstats == NULL)
-		return count + xcount;
+			if (xcount < 0)
+				return xcount;
+
+			if (values != NULL)
+				for (i = 0 ; i < (unsigned int)xcount; i++)
+					values[i + count] = xstats[i].value;
+		}
 
-	/* now fill the xstats structure */
-	count = 0;
-	rte_eth_stats_get(port_id, &eth_stats);
+		if (n < count + xcount || values == NULL)
+			return count + xcount;
 
-	/* global stats */
-	for (i = 0; i < RTE_NB_STATS; i++) {
-		stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_stats_strings[i].offset);
-		val = *stats_ptr;
-		xstats[count++].value = val;
-	}
+		/* now fill the xstats structure */
+		count = 0;
+		rte_eth_stats_get(port_id, &eth_stats);
 
-	/* per-rxq stats */
-	for (q = 0; q < nb_rxqs; q++) {
-		for (i = 0; i < RTE_NB_RXQ_STATS; i++) {
+		/* global stats */
+		for (i = 0; i < RTE_NB_STATS; i++) {
 			stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_rxq_stats_strings[i].offset +
-					q * sizeof(uint64_t));
+						rte_stats_strings[i].offset);
 			val = *stats_ptr;
-			xstats[count++].value = val;
+			values[count++] = val;
 		}
+
+		/* per-rxq stats */
+		for (q = 0; q < nb_rxqs; q++) {
+			for (i = 0; i < RTE_NB_RXQ_STATS; i++) {
+				stats_ptr = RTE_PTR_ADD(&eth_stats,
+					    rte_rxq_stats_strings[i].offset +
+					    q * sizeof(uint64_t));
+				val = *stats_ptr;
+				values[count++] = val;
+			}
+		}
+
+		/* per-txq stats */
+		for (q = 0; q < nb_txqs; q++) {
+			for (i = 0; i < RTE_NB_TXQ_STATS; i++) {
+				stats_ptr = RTE_PTR_ADD(&eth_stats,
+					    rte_txq_stats_strings[i].offset +
+					    q * sizeof(uint64_t));
+				val = *stats_ptr;
+				values[count++] = val;
+			}
+		}
+
+		return count + xcount;
 	}
+	/* Need only xstats given by IDS array */
+	else {
+		uint16_t i, size;
+		uint64_t *values_copy;
 
-	/* per-txq stats */
-	for (q = 0; q < nb_txqs; q++) {
-		for (i = 0; i < RTE_NB_TXQ_STATS; i++) {
-			stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_txq_stats_strings[i].offset +
-					q * sizeof(uint64_t));
-			val = *stats_ptr;
-			xstats[count++].value = val;
+		size = rte_eth_xstats_get_v1705(port_id, NULL, NULL, 0);
+
+		values_copy = malloc(sizeof(values_copy) * size);
+		if (!values_copy) {
+			RTE_PMD_DEBUG_TRACE(
+			    "ERROR: can't allocate memory for values_copy\n");
+			return -1;
+		}
+
+		rte_eth_xstats_get_v1705(port_id, NULL, values_copy, size);
+
+		for (i = 0; i < n; i++) {
+			if (ids[i] >= size) {
+				RTE_PMD_DEBUG_TRACE(
+					"ERROR: id value isn't valid\n");
+				return -1;
+			}
+			values[i] = values_copy[ids[i]];
 		}
+		free(values_copy);
+		return n;
+	}
+}
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get, _v1705, 17.05);
+
+MAP_STATIC_SYMBOL(int
+		rte_eth_xstats_get(uint8_t port_id, uint64_t *ids,
+		uint64_t *values, unsigned int n), rte_eth_xstats_get_v1705);
+
+__rte_deprecated int
+rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n)
+{
+	uint64_t *values_copy;
+	uint16_t size, i;
+
+	values_copy = malloc(sizeof(values_copy) * n);
+	if (!values_copy) {
+		RTE_PMD_DEBUG_TRACE(
+				"ERROR: Cannot allocate memory for xstats\n");
+		return -1;
 	}
+	size = rte_eth_xstats_get(port_id, 0, values_copy, n);
 
-	for (i = 0; i < count; i++)
+	for (i = 0; i < n; i++) {
 		xstats[i].id = i;
-	/* add an offset to driver-specific stats */
-	for ( ; i < count + xcount; i++)
-		xstats[i].id += count;
+		xstats[i].value = values_copy[i];
+	}
+	free(values_copy);
+	return size;
+}
 
-	return count + xcount;
+__rte_deprecated int
+rte_eth_xstats_get_names_all(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n)
+{
+	return rte_eth_xstats_get_names(port_id, xstats_names, n, NULL);
 }
 
 /* reset ethdev extended statistics */
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index d072538..0ef9d20 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -186,6 +186,7 @@
 #include "rte_ether.h"
 #include "rte_eth_ctrl.h"
 #include "rte_dev_info.h"
+#include "rte_compat.h"
 
 struct rte_mbuf;
 
@@ -1118,6 +1119,10 @@ typedef int (*eth_xstats_get_t)(struct rte_eth_dev *dev,
 	struct rte_eth_xstat *stats, unsigned n);
 /**< @internal Get extended stats of an Ethernet device. */
 
+typedef int (*eth_xstats_get_by_ids_t)(struct rte_eth_dev *dev,
+		uint64_t *ids, uint64_t *values, unsigned int n);
+/**< @internal Get extended stats of an Ethernet device. */
+
 typedef void (*eth_xstats_reset_t)(struct rte_eth_dev *dev);
 /**< @internal Reset extended stats of an Ethernet device. */
 
@@ -1125,6 +1130,17 @@ typedef int (*eth_xstats_get_names_t)(struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, unsigned size);
 /**< @internal Get names of extended stats of an Ethernet device. */
 
+typedef int (*eth_xstats_get_names_by_ids_t)(struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+	unsigned int size);
+/**< @internal Get names of extended stats of an Ethernet device. */
+
+typedef int (*eth_xstats_get_by_name_t)(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names,
+		struct rte_eth_xstat *xstat,
+		const char *name);
+/**< @internal Get xstat specified by name of an Ethernet device. */
+
 typedef int (*eth_queue_stats_mapping_set_t)(struct rte_eth_dev *dev,
 					     uint16_t queue_id,
 					     uint8_t stat_idx,
@@ -1466,8 +1482,8 @@ struct eth_dev_ops {
 	eth_stats_reset_t          stats_reset;   /**< Reset generic device statistics. */
 	eth_xstats_get_t           xstats_get;    /**< Get extended device statistics. */
 	eth_xstats_reset_t         xstats_reset;  /**< Reset extended device statistics. */
-	eth_xstats_get_names_t     xstats_get_names;
-	/**< Get names of extended statistics. */
+	eth_xstats_get_names_t	   xstats_get_names;
+	/**< Get names of extended device statistics. */
 	eth_queue_stats_mapping_set_t queue_stats_mapping_set;
 	/**< Configure per queue stat counter mapping. */
 
@@ -1563,6 +1579,12 @@ struct eth_dev_ops {
 	eth_timesync_adjust_time   timesync_adjust_time; /** Adjust the device clock. */
 	eth_timesync_read_time     timesync_read_time; /** Get the device clock time. */
 	eth_timesync_write_time    timesync_write_time; /** Set the device clock time. */
+	eth_xstats_get_by_ids_t    xstats_get_by_ids;
+	/**< Get extended device statistics by ID. */
+	eth_xstats_get_names_by_ids_t xstats_get_names_by_ids;
+	/**< Get name of extended device statistics by ID. */
+	eth_xstats_get_by_name_t   xstats_get_by_name;
+	/**< Get extended device statistics by name. */
 };
 
 /**
@@ -2324,8 +2346,55 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  */
 void rte_eth_stats_reset(uint8_t port_id);
 
+
 /**
- * Retrieve names of extended statistics of an Ethernet device.
+* Gets the ID of a statistic from its name.
+*
+* Note this function searches for the statistics using string compares, and
+* as such should not be used on the fast-path. For fast-path retrieval of
+* specific statistics, store the ID as provided in *id* from this function,
+* and pass the ID to rte_eth_xstats_get()
+*
+* @param port_id The port to look up statistics from
+* @param xstat_name The name of the statistic to return
+* @param[out] id A pointer to an app-supplied uint64_t which should be
+*                set to the ID of the stat if the stat exists.
+* @return
+*    0 on success
+*    -ENODEV for invalid port_id,
+*    -EINVAL if the xstat_name doesn't exist in port_id
+*/
+int rte_eth_xstats_get_id_by_name(uint8_t port_id, const char *xstat_name,
+		uint64_t *id);
+
+/**
+ * Retrieve all extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats
+ *   A pointer to a table of structure of type *rte_eth_xstat*
+ *   to be filled with device statistics ids and values: id is the
+ *   index of the name string in xstats_names (see rte_eth_xstats_get_names()),
+ *   and value is the statistic counter.
+ *   This parameter can be set to NULL if n is 0.
+ * @param n
+ *   The size of the xstats array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+__rte_deprecated
+int rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n);
+
+/**
+ * Retrieve names of all extended statistics of an Ethernet device.
  *
  * @param port_id
  *   The port identifier of the Ethernet device.
@@ -2333,7 +2402,7 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  *   An rte_eth_xstat_name array of at least *size* elements to
  *   be filled. If set to NULL, the function returns the required number
  *   of elements.
- * @param size
+ * @param n
  *   The size of the xstats_names array (number of elements).
  * @return
  *   - A positive value lower or equal to size: success. The return value
@@ -2344,9 +2413,8 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  *     shall not be used by the caller.
  *   - A negative value on error (invalid port id).
  */
-int rte_eth_xstats_get_names(uint8_t port_id,
-		struct rte_eth_xstat_name *xstats_names,
-		unsigned size);
+__rte_deprecated int rte_eth_xstats_get_names_all(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n);
 
 /**
  * Retrieve extended statistics of an Ethernet device.
@@ -2370,8 +2438,92 @@ int rte_eth_xstats_get_names(uint8_t port_id,
  *     shall not be used by the caller.
  *   - A negative value on error (invalid port id).
  */
-int rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
-		unsigned n);
+int rte_eth_xstats_get_v22(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n);
+
+/**
+ * Retrieve extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param ids
+ *   A pointer to an ids array passed by application. This tells wich
+ *   statistics values function should retrieve. This parameter
+ *   can be set to NULL if n is 0. In this case function will retrieve
+ *   all avalible statistics.
+ * @param values
+ *   A pointer to a table to be filled with device statistics values.
+ * @param n
+ *   The size of the ids array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_v1705(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n);
+
+int rte_eth_xstats_get(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n);
+
+/**
+ * Retrieve extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats_names
+ *   A pointer to a table of structure of type *rte_eth_xstat*
+ *   to be filled with device statistics ids and values: id is the
+ *   index of the name string in xstats_names (see rte_eth_xstats_get_names()),
+ *   and value is the statistic counter.
+ *   This parameter can be set to NULL if n is 0.
+ * @param n
+ *   The size of the xstats array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_names_v1607(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n);
+
+/**
+ * Retrieve names of extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats_names
+ *   An rte_eth_xstat_name array of at least *size* elements to
+ *   be filled. If set to NULL, the function returns the required number
+ *   of elements.
+ * @param ids
+ *   IDs array given by app to retrieve specific statistics
+ * @param size
+ *   The size of the xstats_names array (number of elements).
+ * @return
+ *   - A positive value lower or equal to size: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than size: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_names_v1705(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, unsigned int size,
+	uint64_t *ids);
+
+int rte_eth_xstats_get_names(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, unsigned int size,
+	uint64_t *ids);
 
 /**
  * Reset extended statistics of an Ethernet device.
diff --git a/lib/librte_ether/rte_ether_version.map b/lib/librte_ether/rte_ether_version.map
index 0ea3856..f4d0136 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -159,5 +159,10 @@ DPDK_17.05 {
 	global:
 
 	rte_eth_find_next;
+	rte_eth_xstats_get_names;
+	rte_eth_xstats_get;
+	rte_eth_xstats_get_all;
+	rte_eth_xstats_get_names_all;
+	rte_eth_xstats_get_id_by_name;
 
 } DPDK_17.02;
-- 
1.9.1

Re: [PATCH v5 1/3] ethdev: new xstats API add retrieving by ID

[Van Haaren, Harry]

> From: Jastrzebski, MichalX K
> Sent: Tuesday, April 11, 2017 5:37 PM
> To: dev@dpdk.org
> Cc: Jain, Deepak K <deepak.k.jain@intel.com>; Van Haaren, Harry <harry.van.haaren@intel.com>;
> Piasecki, JacekX <jacekx.piasecki@intel.com>; Kozak, KubaX <kubax.kozak@intel.com>; Kulasek,
> TomaszX <tomaszx.kulasek@intel.com>
> Subject: [PATCH v5 1/3] ethdev: new xstats API add retrieving by ID
> 
> From: Jacek Piasecki <jacekx.piasecki@intel.com>
> 
> Extended xstats API in ethdev library to allow grouping of stats
> logically so they can be retrieved per logical grouping  managed
> by the application.
> Changed existing functions rte_eth_xstats_get_names and
> rte_eth_xstats_get to use a new list of arguments: array of ids
> and array of values. ABI versioning mechanism was used to
> support backward compatibility.
> Introduced two new functions rte_eth_xstats_get_all and
> rte_eth_xstats_get_names_all which keeps functionality of the
> previous ones (respectively rte_eth_xstats_get and
> rte_eth_xstats_get_names) but use new API inside.
> Both functions marked as deprecated.
> Introduced new function: rte_eth_xstats_get_id_by_name
> to retrieve xstats ids by its names.
> 
> test-pmd: add support for new xstats API retrieving by id in
> testpmd application: xstats_get() and
> xstats_get_names() call with modified parameters.
> 
> proc_info: add support for new xstats API retrieving by id to
> proc_info application. There is a new argument --xstats-ids
> in proc_info command line to retrieve statistics given by ids.
> E.g. --xstats-ids="1,3,5,7,8"
> 
> doc: add description for modified xstats API
> Documentation change for modified extended statistics API functions.
> The old API only allows retrieval of *all* of the NIC statistics
> at once. Given this requires a MMIO read PCI transaction per statistic
> it is an inefficient way of retrieving just a few key statistics.
> Often a monitoring agent only has an interest in a few key statistics,
> and the old API forces wasting CPU time and PCIe bandwidth in retrieving
> *all* statistics; even those that the application didn't explicitly
> show an interest in.
> The new, more flexible API allow retrieval of statistics per ID.
> If a PMD wishes, it can be implemented to read just the required
> NIC registers. As a result, the monitoring application no longer wastes
> PCIe bandwidth and CPU time.
> 
> Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
> Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
> Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>


As part of this patchset 3 functions were added to struct eth_dev_ops, to provide more flexible xstats() APIs.

This patchset uses symbol versioning to keep ABI stable. I have checked ABI using ./devtools/validate-abi.sh script for both GCC 5.4.0 and Clang 3.8.0. GCC indicates Compatible, while Clang says there is a single Medium issue, which I believe to be a false positive (details below).

The clang Medium issue is described as follows by the ABI report;
- struct rte_eth_dev :
  Change: Size of field dev_ops has been changed from 624 bytes to 648 bytes [HvH: due to adding 3 xstats function pointers to end of struct] 
  Effect: Previous accesses of applications and library functions to this field and fields at higher positions of the structure definition may be broken. 

The reason I believe this is a false positive is that the "dev_ops" field is defined in the rte_eth_dev struct as follows:
  const struct eth_dev_ops *dev_ops;

Any accesses made to dev_ops will be by this pointer-dereference, so the *size* of dev_ops *in* rte_eth_dev struct is still a pointer - it hasn't changed. Hence "accesses to this field and fields at higher positions of the structure" will not be changed - the pointer in the rte_eth_dev struct remains a pointer.


Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

Re: [PATCH v5 1/3] ethdev: new xstats API add retrieving by ID

[Thomas Monjalon]

> --- a/app/proc_info/main.c
> +++ b/app/proc_info/main.c
>  		"  --stats: to display port statistics, enabled by default\n"
>  		"  --xstats: to display extended port statistics, disabled by "
>  			"default\n"
> -		"  --metrics: to display derived metrics of the ports, disabled by "
> -			"default\n"
> +		"  --xstats-name NAME: to display single xstat value by NAME\n"
> +		"  --xstats-ids IDLIST: to display xstat values by id. "
> +			"The argument is comma-separated list of xstat ids to print out.\n"
>  		"  --stats-reset: to reset port statistics\n"
>  		"  --xstats-reset: to reset port extended statistics\n"

Why removing --metrics? Is it a rebase mistake?

Please, could you introduce these new proc_info options in a separate patch?

> --- a/doc/guides/prog_guide/poll_mode_drv.rst
> +++ b/doc/guides/prog_guide/poll_mode_drv.rst
> +The extended statistics API allows a PMD to expose all statistics that are
> +available to it, including statistics that are unique to the device.
> +Each statistic has three properties ``name``, ``id`` and ``value``:
> +
> +* ``name``: A human readable string formatted by the scheme detailed below.
> +* ``id``: An integer that represents only that statistic.

Suggestion: we could say that the id/name pair may change from a device
to another one.

> --- a/lib/librte_ether/rte_ethdev.c
> +++ b/lib/librte_ether/rte_ethdev.c
>  int
> -rte_eth_xstats_get_names(uint8_t port_id,
> -	struct rte_eth_xstat_name *xstats_names,
> -	unsigned size)
> +rte_eth_xstats_get_id_by_name(uint8_t port_id, const char *xstat_name,
> +		uint64_t *id)
[...]
> +/* retrieve ethdev extended statistics */
> +int
> +rte_eth_xstats_get_v22(uint8_t port_id, struct rte_eth_xstat *xstats,
> +	unsigned int n)

I do not manage to review the function changes because of the mix
of versioning old functions and introduce new ones.
It would have been simpler to separate these two steps in separate patches.

> --- a/lib/librte_ether/rte_ethdev.h
> +++ b/lib/librte_ether/rte_ethdev.h
> -	eth_xstats_get_names_t     xstats_get_names;
> -	/**< Get names of extended statistics. */
> +	eth_xstats_get_names_t	   xstats_get_names;
> +	/**< Get names of extended device statistics. */

It seems a space alignment has been removed here.

> - * Retrieve names of extended statistics of an Ethernet device.
> +* Gets the ID of a statistic from its name.
> +*
> +* Note this function searches for the statistics using string compares, and
> +* as such should not be used on the fast-path. For fast-path retrieval of
> +* specific statistics, store the ID as provided in *id* from this function,
> +* and pass the ID to rte_eth_xstats_get()

Good to note :)

> -int rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
> -		unsigned n);
[...]
> +int rte_eth_xstats_get_v1705(uint8_t port_id, uint64_t *ids, uint64_t *values,
> +	unsigned int n);
> +
> +int rte_eth_xstats_get(uint8_t port_id, uint64_t *ids, uint64_t *values,
> +	unsigned int n);

It is an API change.
Please reference it in the release notes.

> --- a/lib/librte_ether/rte_ether_version.map
> +++ b/lib/librte_ether/rte_ether_version.map
> @@ -159,5 +159,10 @@ DPDK_17.05 {
>  	global:
>  
>  	rte_eth_find_next;
> +	rte_eth_xstats_get_names;
> +	rte_eth_xstats_get;
> +	rte_eth_xstats_get_all;
> +	rte_eth_xstats_get_names_all;
> +	rte_eth_xstats_get_id_by_name;

Please keep alphabetical order.


Conclusion: The API looks right.
I have not checked the implementation and hope there will be less bugs
than when introducing the old one ;)

Re: [PATCH v5 1/3] ethdev: new xstats API add retrieving by ID

[Mcnamara, John]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Michal Jastrzebski
> Sent: Tuesday, April 11, 2017 5:37 PM
> To: dev@dpdk.org
> Cc: Jain, Deepak K <deepak.k.jain@intel.com>; Van Haaren, Harry
> <harry.van.haaren@intel.com>; Piasecki, JacekX
> <jacekx.piasecki@intel.com>; Kozak, KubaX <kubax.kozak@intel.com>;
> Kulasek, TomaszX <tomaszx.kulasek@intel.com>
> Subject: [dpdk-dev] [PATCH v5 1/3] ethdev: new xstats API add retrieving
> by ID
> 
> From: Jacek Piasecki <jacekx.piasecki@intel.com>
> 
> ...
>
> +Scheme for Human Readable Names
> +_______________________________
> 
>  A naming scheme exists for the strings exposed to clients of the API.
> This is  to allow scraping of the API for statistics of interest. The
> naming scheme uses @@ -363,8 +359,8 @@ strings split by a single


Minor request, if you are updating this patchset could you use a different
title underline than ____.

The guidelines suggest:

    Level 1 Heading
    ===============


    Level 2 Heading
    ---------------


    Level 3 Heading
    ~~~~~~~~~~~~~~~


    Level 4 Heading
    ^^^^^^^^^^^^^^^

http://dpdk.org/doc/guides/contributing/documentation.html#section-headers


So in this case it should probably be ^^^^^^^^^^.

However, that is fairly minor and it is okay as is if you don't get to it.

John

[PATCH v6 0/5] Extended xstats API in ethdev library to allow grouping of stats

[Kuba Kozak]

Extended xstats API in ethdev library to allow grouping of stats logically
so they can be retrieved per logical grouping  managed by the application.
Changed existing functions rte_eth_xstats_get_names and rte_eth_xstats_get
to use a new list of arguments: array of ids and array of values.
ABI versioning mechanism was used to support backward compatibility.
Introduced two new functions rte_eth_xstats_get_all and
rte_eth_xstats_get_names_all which keeps functionality of the previous
ones (respectively rte_eth_xstats_get and rte_eth_xstats_get_names)
but use new API inside. Both functions marked as deprecated. 
Introduced new function: rte_eth_xstats_get_id_by_name to retrieve
xstats ids by its names.
Extended functionality of proc_info application:
--xstats-name NAME: to display single xstat value by NAME
Updated test-pmd application to use new API.

v6 changes:
* patches arrangement in patchset
* fixes spelling bugs
* release notes

v5 changes:
* fix clang shared build compilation
* remove wrong versioning macros
* Makefile LIBABIVER 6 change 

v4 changes:
* documentation change after API modification
* fix xstats display for PMD without _by_ids() functions
* fix ABI validator errors

v3 changes:
* checkpatch fixes
* removed malloc bug in ethdev
* add new command to proc_info and IDs parsing
* merged testpmd and proc_info patch with library patch

Jacek Piasecki (3):
  ethdev: new xstats API add retrieving by ID
  net/e1000: new xstats API add ID support for e1000
  net/ixgbe: new xstats API add ID support for ixgbe

Kuba Kozak (2):
  ethdev: added new function for xstats ID
  proc-info: add support for new xstats API

 app/proc_info/main.c                    | 148 ++++++++++-
 app/test-pmd/config.c                   |  19 +-
 doc/guides/prog_guide/poll_mode_drv.rst | 173 +++++++++++--
 doc/guides/rel_notes/release_17_05.rst  |   8 +
 drivers/net/e1000/igb_ethdev.c          |  92 ++++++-
 drivers/net/ixgbe/ixgbe_ethdev.c        | 179 +++++++++++++
 lib/librte_ether/rte_ethdev.c           | 430 ++++++++++++++++++++++++--------
 lib/librte_ether/rte_ethdev.h           | 167 ++++++++++++-
 lib/librte_ether/rte_ether_version.map  |   5 +
 9 files changed, 1070 insertions(+), 151 deletions(-)

-- 
1.9.1

[PATCH v6 1/5] ethdev: new xstats API add retrieving by ID

[Kuba Kozak]

From: Jacek Piasecki <jacekx.piasecki@intel.com>

Extended xstats API in ethdev library to allow grouping of stats
logically so they can be retrieved per logical grouping  managed
by the application.
Changed existing functions rte_eth_xstats_get_names and
rte_eth_xstats_get to use a new list of arguments: array of ids
and array of values. ABI versioning mechanism was used to
support backward compatibility.
Introduced two new functions rte_eth_xstats_get_all and
rte_eth_xstats_get_names_all which keeps functionality of the
previous ones (respectively rte_eth_xstats_get and
rte_eth_xstats_get_names) but use new API inside.

test-pmd: add support for new xstats API retrieving by id in
testpmd application: xstats_get() and
xstats_get_names() call with modified parameters.

doc: add description for modified xstats API
Documentation change for modified extended statistics API functions.
The old API only allows retrieval of *all* of the NIC statistics
at once. Given this requires a MMIO read PCI transaction per statistic
it is an inefficient way of retrieving just a few key statistics.
Often a monitoring agent only has an interest in a few key statistics,
and the old API forces wasting CPU time and PCIe bandwidth in retrieving
*all* statistics; even those that the application didn't explicitly
show an interest in.
The new, more flexible API allow retrieval of statistics per ID.
If a PMD wishes, it can be implemented to read just the required
NIC registers. As a result, the monitoring application no longer wastes
PCIe bandwidth and CPU time.

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>
---
 app/proc_info/main.c                    |   6 +-
 app/test-pmd/config.c                   |  19 +-
 doc/guides/prog_guide/poll_mode_drv.rst | 173 ++++++++++++--
 doc/guides/rel_notes/release_17_05.rst  |   6 +
 lib/librte_ether/rte_ethdev.c           | 386 +++++++++++++++++++++++---------
 lib/librte_ether/rte_ethdev.h           | 144 +++++++++++-
 lib/librte_ether/rte_ether_version.map  |   4 +
 7 files changed, 596 insertions(+), 142 deletions(-)

diff --git a/app/proc_info/main.c b/app/proc_info/main.c
index d576b42..9f5e219 100644
--- a/app/proc_info/main.c
+++ b/app/proc_info/main.c
@@ -358,7 +358,7 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 	int len, ret, i;
 	static const char *nic_stats_border = "########################";
 
-	len = rte_eth_xstats_get_names(port_id, NULL, 0);
+	len = rte_eth_xstats_get_names_all(port_id, NULL, 0);
 	if (len < 0) {
 		printf("Cannot get xstats count\n");
 		return;
@@ -375,7 +375,7 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 		free(xstats);
 		return;
 	}
-	if (len != rte_eth_xstats_get_names(
+	if (len != rte_eth_xstats_get_names_all(
 			port_id, xstats_names, len)) {
 		printf("Cannot get xstat names\n");
 		goto err;
@@ -385,7 +385,7 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 			   port_id);
 	printf("%s############################\n",
 			   nic_stats_border);
-	ret = rte_eth_xstats_get(port_id, xstats, len);
+	ret = rte_eth_xstats_get_all(port_id, xstats, len);
 	if (ret < 0 || ret > len) {
 		printf("Cannot get xstats\n");
 		goto err;
diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 4d873cd..ef07925 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -264,9 +264,9 @@ struct rss_type_info {
 void
 nic_xstats_display(portid_t port_id)
 {
-	struct rte_eth_xstat *xstats;
 	int cnt_xstats, idx_xstat;
 	struct rte_eth_xstat_name *xstats_names;
+	uint64_t *values;
 
 	printf("###### NIC extended statistics for port %-2d\n", port_id);
 	if (!rte_eth_dev_is_valid_port(port_id)) {
@@ -275,7 +275,7 @@ struct rss_type_info {
 	}
 
 	/* Get count */
-	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, 0);
+	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, 0, NULL);
 	if (cnt_xstats  < 0) {
 		printf("Error: Cannot get count of xstats\n");
 		return;
@@ -288,23 +288,24 @@ struct rss_type_info {
 		return;
 	}
 	if (cnt_xstats != rte_eth_xstats_get_names(
-			port_id, xstats_names, cnt_xstats)) {
+			port_id, xstats_names, cnt_xstats, NULL)) {
 		printf("Error: Cannot get xstats lookup\n");
 		free(xstats_names);
 		return;
 	}
 
 	/* Get stats themselves */
-	xstats = malloc(sizeof(struct rte_eth_xstat) * cnt_xstats);
-	if (xstats == NULL) {
+	values = malloc(sizeof(values) * cnt_xstats);
+	if (values == NULL) {
 		printf("Cannot allocate memory for xstats\n");
 		free(xstats_names);
 		return;
 	}
-	if (cnt_xstats != rte_eth_xstats_get(port_id, xstats, cnt_xstats)) {
+	if (cnt_xstats != rte_eth_xstats_get(port_id, NULL, values,
+			cnt_xstats)) {
 		printf("Error: Unable to get xstats\n");
 		free(xstats_names);
-		free(xstats);
+		free(values);
 		return;
 	}
 
@@ -312,9 +313,9 @@ struct rss_type_info {
 	for (idx_xstat = 0; idx_xstat < cnt_xstats; idx_xstat++)
 		printf("%s: %"PRIu64"\n",
 			xstats_names[idx_xstat].name,
-			xstats[idx_xstat].value);
+			values[idx_xstat]);
 	free(xstats_names);
-	free(xstats);
+	free(values);
 }
 
 void
diff --git a/doc/guides/prog_guide/poll_mode_drv.rst b/doc/guides/prog_guide/poll_mode_drv.rst
index e48c121..a1a758b 100644
--- a/doc/guides/prog_guide/poll_mode_drv.rst
+++ b/doc/guides/prog_guide/poll_mode_drv.rst
@@ -334,24 +334,21 @@ The Ethernet device API exported by the Ethernet PMDs is described in the *DPDK
 Extended Statistics API
 ~~~~~~~~~~~~~~~~~~~~~~~
 
-The extended statistics API allows each individual PMD to expose a unique set
-of statistics. Accessing these from application programs is done via two
-functions:
-
-* ``rte_eth_xstats_get``: Fills in an array of ``struct rte_eth_xstat``
-  with extended statistics.
-* ``rte_eth_xstats_get_names``: Fills in an array of
-  ``struct rte_eth_xstat_name`` with extended statistic name lookup
-  information.
-
-Each ``struct rte_eth_xstat`` contains an identifier and value pair, and
-each ``struct rte_eth_xstat_name`` contains a string. Each identifier
-within the ``struct rte_eth_xstat`` lookup array must have a corresponding
-entry in the ``struct rte_eth_xstat_name`` lookup array. Within the latter
-the index of the entry is the identifier the string is associated with.
-These identifiers, as well as the number of extended statistic exposed, must
-remain constant during runtime. Note that extended statistic identifiers are
+The extended statistics API allows a PMD to expose all statistics that are
+available to it, including statistics that are unique to the device.
+Each statistic has three properties ``name``, ``id`` and ``value``:
+
+* ``name``: A human readable string formatted by the scheme detailed below.
+* ``id``: An integer that represents only that statistic.
+* ``value``: A unsigned 64-bit integer that is the value of the statistic.
+
+Note that extended statistic identifiers are
 driver-specific, and hence might not be the same for different ports.
+The API consists of various ``rte_eth_xstats_*()`` functions, and allows an
+application to be flexible in how it retrieves statistics.
+
+Scheme for Human Readable Names
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 A naming scheme exists for the strings exposed to clients of the API. This is
 to allow scraping of the API for statistics of interest. The naming scheme uses
@@ -363,8 +360,8 @@ strings split by a single underscore ``_``. The scheme is as follows:
 * detail n
 * unit
 
-Examples of common statistics xstats strings, formatted to comply to the scheme
-proposed above:
+Examples of common statistics xstats strings, formatted to comply to the
+above scheme:
 
 * ``rx_bytes``
 * ``rx_crc_errors``
@@ -378,7 +375,7 @@ associated with the receive side of the NIC.  The second component ``packets``
 indicates that the unit of measure is packets.
 
 A more complicated example: ``tx_size_128_to_255_packets``. In this example,
-``tx`` indicates transmission, ``size``  is the first detail, ``128`` etc are
+``tx`` indicates transmission, ``size``  is the first detail, ``128`` etc. are
 more details, and ``packets`` indicates that this is a packet counter.
 
 Some additions in the metadata scheme are as follows:
@@ -392,3 +389,139 @@ Some additions in the metadata scheme are as follows:
 An example where queue numbers are used is as follows: ``tx_q7_bytes`` which
 indicates this statistic applies to queue number 7, and represents the number
 of transmitted bytes on that queue.
+
+API Design
+^^^^^^^^^^
+
+The xstats API uses the ``name``, ``id``, and ``value`` to allow performant
+lookup of specific statistics. Performant lookup means two things;
+
+* No string comparisons with the ``name`` of the statistic in fast-path
+* Allow requesting of only the statistics of interest
+
+The API ensures these requirements are met by mapping the ``name`` of the
+statistic to a unique ``id``, which is used as a key for lookup in the fast-path.
+The API allows applications to request an array of ``id`` values, so that the
+PMD only performs the required calculations. Expected usage is that the
+application scans the ``name`` of each statistic, and caches the ``id``
+if it has an interest in that statistic. On the fast-path, the integer can be used
+to retrieve the actual ``value`` of the statistic that the ``id`` represents.
+
+API Functions
+^^^^^^^^^^^^^
+
+The API is built out of a small number of functions, which can be used to
+retrieve the number of statistics and the names, IDs and values of those
+statistics.
+
+* ``rte_eth_xstats_get_names()``: returns the names of the statistics. When given a
+  ``NULL`` parameter the function returns the number of statistics that are available.
+
+* ``rte_eth_xstats_get_id_by_name()``: Searches for the statistic ID that matches
+  ``xstat_name``. If found, the ``id`` integer is set.
+
+* ``rte_eth_xstats_get()``: Fills in an array of ``uint64_t`` values
+  with matching the provided ``ids`` array. If the ``ids`` array is NULL, it
+  returns all statistics that are available.
+
+
+Application Usage
+^^^^^^^^^^^^^^^^^
+
+Imagine an application that wants to view the dropped packet count. If no
+packets are dropped, the application does not read any other metrics for
+performance reasons. If packets are dropped, the application has a particular
+set of statistics that it requests. This "set" of statistics allows the app to
+decide what next steps to perform. The following code-snippets show how the
+xstats API can be used to achieve this goal.
+
+First step is to get all statistics names and list them:
+
+.. code-block:: c
+
+    struct rte_eth_xstat_name *xstats_names;
+    uint64_t *values;
+    int len, i;
+
+    /* Get number of stats */
+    len = rte_eth_xstats_get_names(port_id, NULL, NULL, 0);
+    if (len < 0) {
+        printf("Cannot get xstats count\n");
+        goto err;
+    }
+
+    xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
+    if (xstats_names == NULL) {
+        printf("Cannot allocate memory for xstat names\n");
+        goto err;
+    }
+
+    /* Retrieve xstats names, passing NULL for IDs to return all statistics */
+    if (len != rte_eth_xstats_get_names(port_id, xstats_names, NULL, len)) {
+        printf("Cannot get xstat names\n");
+        goto err;
+    }
+
+    values = malloc(sizeof(values) * len);
+    if (values == NULL) {
+        printf("Cannot allocate memory for xstats\n");
+        goto err;
+    }
+
+    /* Getting xstats values */
+    if (len != rte_eth_xstats_get(port_id, NULL, values, len)) {
+        printf("Cannot get xstat values\n");
+        goto err;
+    }
+
+    /* Print all xstats names and values */
+    for (i = 0; i < len; i++) {
+        printf("%s: %"PRIu64"\n", xstats_names[i].name, values[i]);
+    }
+
+The application has access to the names of all of the statistics that the PMD
+exposes. The application can decide which statistics are of interest, cache the
+ids of those statistics by looking up the name as follows:
+
+.. code-block:: c
+
+    uint64_t id;
+    uint64_t value;
+    const char *xstat_name = "rx_errors";
+
+    if(!rte_eth_xstats_get_id_by_name(port_id, xstat_name, &id)) {
+        rte_eth_xstats_get(port_id, &id, &value, 1);
+        printf("%s: %"PRIu64"\n", xstat_name, value);
+    }
+    else {
+        printf("Cannot find xstats with a given name\n");
+        goto err;
+    }
+
+The API provides flexibility to the application so that it can look up multiple
+statistics using an array containing multiple ``id`` numbers. This reduces the
+function call overhead of retrieving statistics, and makes lookup of multiple
+statistics simpler for the application.
+
+.. code-block:: c
+
+    #define APP_NUM_STATS 4
+    /* application cached these ids previously; see above */
+    uint64_t ids_array[APP_NUM_STATS] = {3,4,7,21};
+    uint64_t value_array[APP_NUM_STATS];
+
+    /* Getting multiple xstats values from array of IDs */
+    rte_eth_xstats_get(port_id, ids_array, value_array, APP_NUM_STATS);
+
+    uint32_t i;
+    for(i = 0; i < APP_NUM_STATS; i++) {
+        printf("%d: %"PRIu64"\n", ids_array[i], value_array[i]);
+    }
+
+
+This array lookup API for xstats allows the application create multiple
+"groups" of statistics, and look up the values of those IDs using a single API
+call. As an end result, the application is able to achieve its goal of
+monitoring a single statistic ("rx_errors" in this case), and if that shows
+packets being dropped, it can easily retrieve a "set" of statistics using the
+IDs array parameter to ``rte_eth_xstats_get`` function.
diff --git a/doc/guides/rel_notes/release_17_05.rst b/doc/guides/rel_notes/release_17_05.rst
index 4968b8f..5b77226 100644
--- a/doc/guides/rel_notes/release_17_05.rst
+++ b/doc/guides/rel_notes/release_17_05.rst
@@ -416,6 +416,12 @@ API Changes
   * The vhost public header file ``rte_virtio_net.h`` is renamed to
     ``rte_vhost.h``
 
+* **Reworked rte_ethdev library**
+
+  * Changed set of input parameters for ``rte_eth_xstats_get`` and ``rte_eth_xstats_get_names`` functions.
+
+  * Added new functions ``rte_eth_xstats_get_all`` and ``rte_eth_xstats_get_names_all to provide backward compatibility for
+    ``rte_eth_xstats_get`` and ``rte_eth_xstats_get_names``
 
 ABI Changes
 -----------
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 4e1e6dc..0adc1d0 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1454,12 +1454,19 @@ struct rte_eth_dev *
 
 	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
 	dev = &rte_eth_devices[port_id];
+	if (dev->dev_ops->xstats_get_names_by_ids != NULL) {
+		count = (*dev->dev_ops->xstats_get_names_by_ids)(dev, NULL,
+				NULL, 0);
+		if (count < 0)
+			return count;
+	}
 	if (dev->dev_ops->xstats_get_names != NULL) {
 		count = (*dev->dev_ops->xstats_get_names)(dev, NULL, 0);
 		if (count < 0)
 			return count;
 	} else
 		count = 0;
+
 	count += RTE_NB_STATS;
 	count += RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS) *
 		 RTE_NB_RXQ_STATS;
@@ -1469,150 +1476,323 @@ struct rte_eth_dev *
 }
 
 int
-rte_eth_xstats_get_names(uint8_t port_id,
+rte_eth_xstats_get_names_v1607(uint8_t port_id,
 	struct rte_eth_xstat_name *xstats_names,
-	unsigned size)
+	unsigned int size)
 {
-	struct rte_eth_dev *dev;
-	int cnt_used_entries;
-	int cnt_expected_entries;
-	int cnt_driver_entries;
-	uint32_t idx, id_queue;
-	uint16_t num_q;
+	return rte_eth_xstats_get_names(port_id, xstats_names, size, NULL);
+}
+VERSION_SYMBOL(rte_eth_xstats_get_names, _v1607, 16.07);
 
-	cnt_expected_entries = get_xstats_count(port_id);
-	if (xstats_names == NULL || cnt_expected_entries < 0 ||
-			(int)size < cnt_expected_entries)
-		return cnt_expected_entries;
+int
+rte_eth_xstats_get_names_v1705(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, unsigned int size,
+	uint64_t *ids)
+{
+	/* Get all xstats */
+	if (!ids) {
+		struct rte_eth_dev *dev;
+		int cnt_used_entries;
+		int cnt_expected_entries;
+		int cnt_driver_entries;
+		uint32_t idx, id_queue;
+		uint16_t num_q;
 
-	/* port_id checked in get_xstats_count() */
-	dev = &rte_eth_devices[port_id];
-	cnt_used_entries = 0;
+		cnt_expected_entries = get_xstats_count(port_id);
+		if (xstats_names == NULL || cnt_expected_entries < 0 ||
+				(int)size < cnt_expected_entries)
+			return cnt_expected_entries;
 
-	for (idx = 0; idx < RTE_NB_STATS; idx++) {
-		snprintf(xstats_names[cnt_used_entries].name,
-			sizeof(xstats_names[0].name),
-			"%s", rte_stats_strings[idx].name);
-		cnt_used_entries++;
-	}
-	num_q = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	for (id_queue = 0; id_queue < num_q; id_queue++) {
-		for (idx = 0; idx < RTE_NB_RXQ_STATS; idx++) {
+		/* port_id checked in get_xstats_count() */
+		dev = &rte_eth_devices[port_id];
+		cnt_used_entries = 0;
+
+		for (idx = 0; idx < RTE_NB_STATS; idx++) {
 			snprintf(xstats_names[cnt_used_entries].name,
 				sizeof(xstats_names[0].name),
-				"rx_q%u%s",
-				id_queue, rte_rxq_stats_strings[idx].name);
+				"%s", rte_stats_strings[idx].name);
 			cnt_used_entries++;
 		}
+		num_q = RTE_MIN(dev->data->nb_rx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		for (id_queue = 0; id_queue < num_q; id_queue++) {
+			for (idx = 0; idx < RTE_NB_RXQ_STATS; idx++) {
+				snprintf(xstats_names[cnt_used_entries].name,
+					sizeof(xstats_names[0].name),
+					"rx_q%u%s",
+					id_queue,
+					rte_rxq_stats_strings[idx].name);
+				cnt_used_entries++;
+			}
 
+		}
+		num_q = RTE_MIN(dev->data->nb_tx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		for (id_queue = 0; id_queue < num_q; id_queue++) {
+			for (idx = 0; idx < RTE_NB_TXQ_STATS; idx++) {
+				snprintf(xstats_names[cnt_used_entries].name,
+					sizeof(xstats_names[0].name),
+					"tx_q%u%s",
+					id_queue,
+					rte_txq_stats_strings[idx].name);
+				cnt_used_entries++;
+			}
+		}
+
+		if (dev->dev_ops->xstats_get_names_by_ids != NULL) {
+			/* If there are any driver-specific xstats, append them
+			 * to end of list.
+			 */
+			cnt_driver_entries =
+				(*dev->dev_ops->xstats_get_names_by_ids)(
+				dev,
+				xstats_names + cnt_used_entries,
+				NULL,
+				size - cnt_used_entries);
+			if (cnt_driver_entries < 0)
+				return cnt_driver_entries;
+			cnt_used_entries += cnt_driver_entries;
+
+		} else if (dev->dev_ops->xstats_get_names != NULL) {
+			/* If there are any driver-specific xstats, append them
+			 * to end of list.
+			 */
+			cnt_driver_entries = (*dev->dev_ops->xstats_get_names)(
+				dev,
+				xstats_names + cnt_used_entries,
+				size - cnt_used_entries);
+			if (cnt_driver_entries < 0)
+				return cnt_driver_entries;
+			cnt_used_entries += cnt_driver_entries;
+		}
+
+		return cnt_used_entries;
 	}
-	num_q = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	for (id_queue = 0; id_queue < num_q; id_queue++) {
-		for (idx = 0; idx < RTE_NB_TXQ_STATS; idx++) {
-			snprintf(xstats_names[cnt_used_entries].name,
-				sizeof(xstats_names[0].name),
-				"tx_q%u%s",
-				id_queue, rte_txq_stats_strings[idx].name);
-			cnt_used_entries++;
+	/* Get only xstats given by IDS */
+	else {
+		uint16_t len, i;
+		struct rte_eth_xstat_name *xstats_names_copy;
+
+		len = rte_eth_xstats_get_names_v1705(port_id, NULL, 0, NULL);
+
+		xstats_names_copy =
+				malloc(sizeof(struct rte_eth_xstat_name) * len);
+		if (!xstats_names_copy) {
+			RTE_PMD_DEBUG_TRACE(
+			     "ERROR: can't allocate memory for values_copy\n");
+			free(xstats_names_copy);
+			return -1;
+		}
+
+		rte_eth_xstats_get_names_v1705(port_id, xstats_names_copy,
+				len, NULL);
+
+		for (i = 0; i < size; i++) {
+			if (ids[i] >= len) {
+				RTE_PMD_DEBUG_TRACE(
+					"ERROR: id value isn't valid\n");
+				return -1;
+			}
+			strcpy(xstats_names[i].name,
+					xstats_names_copy[ids[i]].name);
 		}
+		free(xstats_names_copy);
+		return size;
 	}
+}
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get_names, _v1705, 17.05);
 
-	if (dev->dev_ops->xstats_get_names != NULL) {
-		/* If there are any driver-specific xstats, append them
-		 * to end of list.
-		 */
-		cnt_driver_entries = (*dev->dev_ops->xstats_get_names)(
-			dev,
-			xstats_names + cnt_used_entries,
-			size - cnt_used_entries);
-		if (cnt_driver_entries < 0)
-			return cnt_driver_entries;
-		cnt_used_entries += cnt_driver_entries;
+MAP_STATIC_SYMBOL(int
+		rte_eth_xstats_get_names(uint8_t port_id,
+			struct rte_eth_xstat_name *xstats_names,
+			unsigned int size,
+			uint64_t *ids), rte_eth_xstats_get_names_v1705);
+
+/* retrieve ethdev extended statistics */
+int
+rte_eth_xstats_get_v22(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n)
+{
+	uint64_t *values_copy;
+	uint16_t size, i;
+
+	values_copy = malloc(sizeof(values_copy) * n);
+	if (!values_copy) {
+		RTE_PMD_DEBUG_TRACE(
+				"ERROR: Cannot allocate memory for xstats\n");
+		return -1;
 	}
+	size = rte_eth_xstats_get(port_id, 0, values_copy, n);
 
-	return cnt_used_entries;
+	for (i = 0; i < n; i++) {
+		xstats[i].id = i;
+		xstats[i].value = values_copy[i];
+	}
+	free(values_copy);
+	return size;
 }
+VERSION_SYMBOL(rte_eth_xstats_get, _v22, 2.2);
 
 /* retrieve ethdev extended statistics */
 int
-rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
-	unsigned n)
+rte_eth_xstats_get_v1705(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n)
 {
-	struct rte_eth_stats eth_stats;
-	struct rte_eth_dev *dev;
-	unsigned count = 0, i, q;
-	signed xcount = 0;
-	uint64_t val, *stats_ptr;
-	uint16_t nb_rxqs, nb_txqs;
+	/* If need all xstats */
+	if (!ids) {
+		struct rte_eth_stats eth_stats;
+		struct rte_eth_dev *dev;
+		unsigned int count = 0, i, q;
+		signed int xcount = 0;
+		uint64_t val, *stats_ptr;
+		uint16_t nb_rxqs, nb_txqs;
 
-	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
+		RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+		dev = &rte_eth_devices[port_id];
 
-	dev = &rte_eth_devices[port_id];
+		nb_rxqs = RTE_MIN(dev->data->nb_rx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		nb_txqs = RTE_MIN(dev->data->nb_tx_queues,
+				RTE_ETHDEV_QUEUE_STAT_CNTRS);
 
-	nb_rxqs = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-	nb_txqs = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
+		/* Return generic statistics */
+		count = RTE_NB_STATS + (nb_rxqs * RTE_NB_RXQ_STATS) +
+			(nb_txqs * RTE_NB_TXQ_STATS);
 
-	/* Return generic statistics */
-	count = RTE_NB_STATS + (nb_rxqs * RTE_NB_RXQ_STATS) +
-		(nb_txqs * RTE_NB_TXQ_STATS);
 
-	/* implemented by the driver */
-	if (dev->dev_ops->xstats_get != NULL) {
-		/* Retrieve the xstats from the driver at the end of the
-		 * xstats struct.
-		 */
-		xcount = (*dev->dev_ops->xstats_get)(dev,
-				     xstats ? xstats + count : NULL,
-				     (n > count) ? n - count : 0);
+		/* implemented by the driver */
+		if (dev->dev_ops->xstats_get_by_ids != NULL) {
+			/* Retrieve the xstats from the driver at the end of the
+			 * xstats struct. Retrieve all xstats.
+			 */
+			xcount = (*dev->dev_ops->xstats_get_by_ids)(dev,
+					NULL,
+					values ? values + count : NULL,
+					(n > count) ? n - count : 0);
+
+			if (xcount < 0)
+				return xcount;
+		/* implemented by the driver */
+		} else if (dev->dev_ops->xstats_get != NULL) {
+			/* Retrieve the xstats from the driver at the end of the
+			 * xstats struct. Retrieve all xstats.
+			 * Compatibility for PMD without xstats_get_by_ids
+			 */
+			unsigned int size = (n > count) ? n - count : 1;
+			struct rte_eth_xstat xstats[size];
 
-		if (xcount < 0)
-			return xcount;
-	}
+			xcount = (*dev->dev_ops->xstats_get)(dev,
+					values ? xstats : NULL,	size);
 
-	if (n < count + xcount || xstats == NULL)
-		return count + xcount;
+			if (xcount < 0)
+				return xcount;
 
-	/* now fill the xstats structure */
-	count = 0;
-	rte_eth_stats_get(port_id, &eth_stats);
+			if (values != NULL)
+				for (i = 0 ; i < (unsigned int)xcount; i++)
+					values[i + count] = xstats[i].value;
+		}
 
-	/* global stats */
-	for (i = 0; i < RTE_NB_STATS; i++) {
-		stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_stats_strings[i].offset);
-		val = *stats_ptr;
-		xstats[count++].value = val;
-	}
+		if (n < count + xcount || values == NULL)
+			return count + xcount;
 
-	/* per-rxq stats */
-	for (q = 0; q < nb_rxqs; q++) {
-		for (i = 0; i < RTE_NB_RXQ_STATS; i++) {
+		/* now fill the xstats structure */
+		count = 0;
+		rte_eth_stats_get(port_id, &eth_stats);
+
+		/* global stats */
+		for (i = 0; i < RTE_NB_STATS; i++) {
 			stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_rxq_stats_strings[i].offset +
-					q * sizeof(uint64_t));
+						rte_stats_strings[i].offset);
 			val = *stats_ptr;
-			xstats[count++].value = val;
+			values[count++] = val;
+		}
+
+		/* per-rxq stats */
+		for (q = 0; q < nb_rxqs; q++) {
+			for (i = 0; i < RTE_NB_RXQ_STATS; i++) {
+				stats_ptr = RTE_PTR_ADD(&eth_stats,
+					    rte_rxq_stats_strings[i].offset +
+					    q * sizeof(uint64_t));
+				val = *stats_ptr;
+				values[count++] = val;
+			}
+		}
+
+		/* per-txq stats */
+		for (q = 0; q < nb_txqs; q++) {
+			for (i = 0; i < RTE_NB_TXQ_STATS; i++) {
+				stats_ptr = RTE_PTR_ADD(&eth_stats,
+					    rte_txq_stats_strings[i].offset +
+					    q * sizeof(uint64_t));
+				val = *stats_ptr;
+				values[count++] = val;
+			}
 		}
+
+		return count + xcount;
 	}
+	/* Need only xstats given by IDS array */
+	else {
+		uint16_t i, size;
+		uint64_t *values_copy;
 
-	/* per-txq stats */
-	for (q = 0; q < nb_txqs; q++) {
-		for (i = 0; i < RTE_NB_TXQ_STATS; i++) {
-			stats_ptr = RTE_PTR_ADD(&eth_stats,
-					rte_txq_stats_strings[i].offset +
-					q * sizeof(uint64_t));
-			val = *stats_ptr;
-			xstats[count++].value = val;
+		size = rte_eth_xstats_get_v1705(port_id, NULL, NULL, 0);
+
+		values_copy = malloc(sizeof(values_copy) * size);
+		if (!values_copy) {
+			RTE_PMD_DEBUG_TRACE(
+			    "ERROR: can't allocate memory for values_copy\n");
+			return -1;
+		}
+
+		rte_eth_xstats_get_v1705(port_id, NULL, values_copy, size);
+
+		for (i = 0; i < n; i++) {
+			if (ids[i] >= size) {
+				RTE_PMD_DEBUG_TRACE(
+					"ERROR: id value isn't valid\n");
+				return -1;
+			}
+			values[i] = values_copy[ids[i]];
 		}
+		free(values_copy);
+		return n;
+	}
+}
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get, _v1705, 17.05);
+
+MAP_STATIC_SYMBOL(int
+		rte_eth_xstats_get(uint8_t port_id, uint64_t *ids,
+		uint64_t *values, unsigned int n), rte_eth_xstats_get_v1705);
+
+int
+rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n)
+{
+	uint64_t *values_copy;
+	uint16_t size, i;
+
+	values_copy = malloc(sizeof(values_copy) * n);
+	if (!values_copy) {
+		RTE_PMD_DEBUG_TRACE(
+				"ERROR: Cannot allocate memory for xstats\n");
+		return -1;
 	}
+	size = rte_eth_xstats_get(port_id, 0, values_copy, n);
 
-	for (i = 0; i < count; i++)
+	for (i = 0; i < n; i++) {
 		xstats[i].id = i;
-	/* add an offset to driver-specific stats */
-	for ( ; i < count + xcount; i++)
-		xstats[i].id += count;
+		xstats[i].value = values_copy[i];
+	}
+	free(values_copy);
+	return size;
+}
 
-	return count + xcount;
+int
+rte_eth_xstats_get_names_all(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n)
+{
+	return rte_eth_xstats_get_names(port_id, xstats_names, n, NULL);
 }
 
 /* reset ethdev extended statistics */
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index d072538..8c94b88 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -186,6 +186,7 @@
 #include "rte_ether.h"
 #include "rte_eth_ctrl.h"
 #include "rte_dev_info.h"
+#include "rte_compat.h"
 
 struct rte_mbuf;
 
@@ -1118,6 +1119,10 @@ typedef int (*eth_xstats_get_t)(struct rte_eth_dev *dev,
 	struct rte_eth_xstat *stats, unsigned n);
 /**< @internal Get extended stats of an Ethernet device. */
 
+typedef int (*eth_xstats_get_by_ids_t)(struct rte_eth_dev *dev,
+		uint64_t *ids, uint64_t *values, unsigned int n);
+/**< @internal Get extended stats of an Ethernet device. */
+
 typedef void (*eth_xstats_reset_t)(struct rte_eth_dev *dev);
 /**< @internal Reset extended stats of an Ethernet device. */
 
@@ -1125,6 +1130,17 @@ typedef int (*eth_xstats_get_names_t)(struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, unsigned size);
 /**< @internal Get names of extended stats of an Ethernet device. */
 
+typedef int (*eth_xstats_get_names_by_ids_t)(struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+	unsigned int size);
+/**< @internal Get names of extended stats of an Ethernet device. */
+
+typedef int (*eth_xstats_get_by_name_t)(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names,
+		struct rte_eth_xstat *xstat,
+		const char *name);
+/**< @internal Get xstat specified by name of an Ethernet device. */
+
 typedef int (*eth_queue_stats_mapping_set_t)(struct rte_eth_dev *dev,
 					     uint16_t queue_id,
 					     uint8_t stat_idx,
@@ -1563,6 +1579,12 @@ struct eth_dev_ops {
 	eth_timesync_adjust_time   timesync_adjust_time; /** Adjust the device clock. */
 	eth_timesync_read_time     timesync_read_time; /** Get the device clock time. */
 	eth_timesync_write_time    timesync_write_time; /** Set the device clock time. */
+	eth_xstats_get_by_ids_t    xstats_get_by_ids;
+	/**< Get extended device statistics by ID. */
+	eth_xstats_get_names_by_ids_t xstats_get_names_by_ids;
+	/**< Get name of extended device statistics by ID. */
+	eth_xstats_get_by_name_t   xstats_get_by_name;
+	/**< Get extended device statistics by name. */
 };
 
 /**
@@ -2325,7 +2347,32 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
 void rte_eth_stats_reset(uint8_t port_id);
 
 /**
- * Retrieve names of extended statistics of an Ethernet device.
+ * Retrieve all extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats
+ *   A pointer to a table of structure of type *rte_eth_xstat*
+ *   to be filled with device statistics ids and values: id is the
+ *   index of the name string in xstats_names (see rte_eth_xstats_get_names()),
+ *   and value is the statistic counter.
+ *   This parameter can be set to NULL if n is 0.
+ * @param n
+ *   The size of the xstats array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n);
+
+/**
+ * Retrieve names of all extended statistics of an Ethernet device.
  *
  * @param port_id
  *   The port identifier of the Ethernet device.
@@ -2333,7 +2380,7 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  *   An rte_eth_xstat_name array of at least *size* elements to
  *   be filled. If set to NULL, the function returns the required number
  *   of elements.
- * @param size
+ * @param n
  *   The size of the xstats_names array (number of elements).
  * @return
  *   - A positive value lower or equal to size: success. The return value
@@ -2344,9 +2391,8 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  *     shall not be used by the caller.
  *   - A negative value on error (invalid port id).
  */
-int rte_eth_xstats_get_names(uint8_t port_id,
-		struct rte_eth_xstat_name *xstats_names,
-		unsigned size);
+int rte_eth_xstats_get_names_all(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n);
 
 /**
  * Retrieve extended statistics of an Ethernet device.
@@ -2370,8 +2416,92 @@ int rte_eth_xstats_get_names(uint8_t port_id,
  *     shall not be used by the caller.
  *   - A negative value on error (invalid port id).
  */
-int rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
-		unsigned n);
+int rte_eth_xstats_get_v22(uint8_t port_id, struct rte_eth_xstat *xstats,
+	unsigned int n);
+
+/**
+ * Retrieve extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param ids
+ *   A pointer to an ids array passed by application. This tells wich
+ *   statistics values function should retrieve. This parameter
+ *   can be set to NULL if n is 0. In this case function will retrieve
+ *   all avalible statistics.
+ * @param values
+ *   A pointer to a table to be filled with device statistics values.
+ * @param n
+ *   The size of the ids array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_v1705(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n);
+
+int rte_eth_xstats_get(uint8_t port_id, uint64_t *ids, uint64_t *values,
+	unsigned int n);
+
+/**
+ * Retrieve extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats_names
+ *   A pointer to a table of structure of type *rte_eth_xstat*
+ *   to be filled with device statistics ids and values: id is the
+ *   index of the name string in xstats_names (see rte_eth_xstats_get_names()),
+ *   and value is the statistic counter.
+ *   This parameter can be set to NULL if n is 0.
+ * @param n
+ *   The size of the xstats array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_names_v1607(uint8_t port_id,
+		struct rte_eth_xstat_name *xstats_names, unsigned int n);
+
+/**
+ * Retrieve names of extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats_names
+ *   An rte_eth_xstat_name array of at least *size* elements to
+ *   be filled. If set to NULL, the function returns the required number
+ *   of elements.
+ * @param ids
+ *   IDs array given by app to retrieve specific statistics
+ * @param size
+ *   The size of the xstats_names array (number of elements).
+ * @return
+ *   - A positive value lower or equal to size: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than size: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_names_v1705(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, unsigned int size,
+	uint64_t *ids);
+
+int rte_eth_xstats_get_names(uint8_t port_id,
+	struct rte_eth_xstat_name *xstats_names, unsigned int size,
+	uint64_t *ids);
 
 /**
  * Reset extended statistics of an Ethernet device.
diff --git a/lib/librte_ether/rte_ether_version.map b/lib/librte_ether/rte_ether_version.map
index 0ea3856..a404434 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -159,5 +159,9 @@ DPDK_17.05 {
 	global:
 
 	rte_eth_find_next;
+	rte_eth_xstats_get;
+	rte_eth_xstats_get_all;
+	rte_eth_xstats_get_names;
+	rte_eth_xstats_get_names_all;
 
 } DPDK_17.02;
-- 
1.9.1

Re: [PATCH v6 1/5] ethdev: new xstats API add retrieving by ID

[Van Haaren, Harry]

> From: Kozak, KubaX
> Sent: Thursday, April 13, 2017 3:59 PM
> To: dev@dpdk.org
> Cc: Van Haaren, Harry <harry.van.haaren@intel.com>; Jain, Deepak K <deepak.k.jain@intel.com>;
> Piasecki, JacekX <jacekx.piasecki@intel.com>; Kozak, KubaX <kubax.kozak@intel.com>; Kulasek,
> TomaszX <tomaszx.kulasek@intel.com>
> Subject: [PATCH v6 1/5] ethdev: new xstats API add retrieving by ID
> 
> From: Jacek Piasecki <jacekx.piasecki@intel.com>
> 
> Extended xstats API in ethdev library to allow grouping of stats
> logically so they can be retrieved per logical grouping  managed
> by the application.
> Changed existing functions rte_eth_xstats_get_names and
> rte_eth_xstats_get to use a new list of arguments: array of ids
> and array of values. ABI versioning mechanism was used to
> support backward compatibility.
> Introduced two new functions rte_eth_xstats_get_all and
> rte_eth_xstats_get_names_all which keeps functionality of the
> previous ones (respectively rte_eth_xstats_get and
> rte_eth_xstats_get_names) but use new API inside.
> 
> test-pmd: add support for new xstats API retrieving by id in
> testpmd application: xstats_get() and
> xstats_get_names() call with modified parameters.
> 
> doc: add description for modified xstats API
> Documentation change for modified extended statistics API functions.
> The old API only allows retrieval of *all* of the NIC statistics
> at once. Given this requires a MMIO read PCI transaction per statistic
> it is an inefficient way of retrieving just a few key statistics.
> Often a monitoring agent only has an interest in a few key statistics,
> and the old API forces wasting CPU time and PCIe bandwidth in retrieving
> *all* statistics; even those that the application didn't explicitly
> show an interest in.
> The new, more flexible API allow retrieval of statistics per ID.
> If a PMD wishes, it can be implemented to read just the required
> NIC registers. As a result, the monitoring application no longer wastes
> PCIe bandwidth and CPU time.
> 
> Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
> Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
> Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>

Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

[PATCH v6 2/5] ethdev: added new function for xstats ID

[Kuba Kozak]

Introduced new function: rte_eth_xstats_get_id_by_name
to retrieve xstats ids by its names.

doc: added release note

Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 doc/guides/rel_notes/release_17_05.rst |  2 ++
 lib/librte_ether/rte_ethdev.c          | 44 ++++++++++++++++++++++++++++++++++
 lib/librte_ether/rte_ethdev.h          | 21 ++++++++++++++++
 lib/librte_ether/rte_ether_version.map |  1 +
 4 files changed, 68 insertions(+)

diff --git a/doc/guides/rel_notes/release_17_05.rst b/doc/guides/rel_notes/release_17_05.rst
index 5b77226..dae4261 100644
--- a/doc/guides/rel_notes/release_17_05.rst
+++ b/doc/guides/rel_notes/release_17_05.rst
@@ -423,6 +423,8 @@ API Changes
   * Added new functions ``rte_eth_xstats_get_all`` and ``rte_eth_xstats_get_names_all to provide backward compatibility for
     ``rte_eth_xstats_get`` and ``rte_eth_xstats_get_names``
 
+  * Added new function ``rte_eth_xstats_get_id_by_name``
+
 ABI Changes
 -----------
 
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 0adc1d0..ef30883 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1476,6 +1476,50 @@ struct rte_eth_dev *
 }
 
 int
+rte_eth_xstats_get_id_by_name(uint8_t port_id, const char *xstat_name,
+		uint64_t *id)
+{
+	int cnt_xstats, idx_xstat;
+
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+
+	if (!id) {
+		RTE_PMD_DEBUG_TRACE("Error: id pointer is NULL\n");
+		return -1;
+	}
+
+	if (!xstat_name) {
+		RTE_PMD_DEBUG_TRACE("Error: xstat_name pointer is NULL\n");
+		return -1;
+	}
+
+	/* Get count */
+	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, 0, NULL);
+	if (cnt_xstats  < 0) {
+		RTE_PMD_DEBUG_TRACE("Error: Cannot get count of xstats\n");
+		return -1;
+	}
+
+	/* Get id-name lookup table */
+	struct rte_eth_xstat_name xstats_names[cnt_xstats];
+
+	if (cnt_xstats != rte_eth_xstats_get_names(
+			port_id, xstats_names, cnt_xstats, NULL)) {
+		RTE_PMD_DEBUG_TRACE("Error: Cannot get xstats lookup\n");
+		return -1;
+	}
+
+	for (idx_xstat = 0; idx_xstat < cnt_xstats; idx_xstat++) {
+		if (!strcmp(xstats_names[idx_xstat].name, xstat_name)) {
+			*id = idx_xstat;
+			return 0;
+		};
+	}
+
+	return -EINVAL;
+}
+
+int
 rte_eth_xstats_get_names_v1607(uint8_t port_id,
 	struct rte_eth_xstat_name *xstats_names,
 	unsigned int size)
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 8c94b88..058c435 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -2346,6 +2346,27 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
  */
 void rte_eth_stats_reset(uint8_t port_id);
 
+
+/**
+ * Gets the ID of a statistic from its name.
+ *
+ * This function searches for the statistics using string compares, and
+ * as such should not be used on the fast-path. For fast-path retrieval of
+ * specific statistics, store the ID as provided in *id* from this function,
+ * and pass the ID to rte_eth_xstats_get()
+ *
+ * @param port_id The port to look up statistics from
+ * @param xstat_name The name of the statistic to return
+ * @param[out] id A pointer to an app-supplied uint64_t which should be
+ *                set to the ID of the stat if the stat exists.
+ * @return
+ *    0 on success
+ *    -ENODEV for invalid port_id,
+ *    -EINVAL if the xstat_name doesn't exist in port_id
+ */
+int rte_eth_xstats_get_id_by_name(uint8_t port_id, const char *xstat_name,
+		uint64_t *id);
+
 /**
  * Retrieve all extended statistics of an Ethernet device.
  *
diff --git a/lib/librte_ether/rte_ether_version.map b/lib/librte_ether/rte_ether_version.map
index a404434..7c41617 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -161,6 +161,7 @@ DPDK_17.05 {
 	rte_eth_find_next;
 	rte_eth_xstats_get;
 	rte_eth_xstats_get_all;
+	rte_eth_xstats_get_id_by_name;
 	rte_eth_xstats_get_names;
 	rte_eth_xstats_get_names_all;
 
-- 
1.9.1

Re: [PATCH v6 2/5] ethdev: added new function for xstats ID

[Van Haaren, Harry]

> From: Kozak, KubaX
> Sent: Thursday, April 13, 2017 3:59 PM
> To: dev@dpdk.org
> Cc: Van Haaren, Harry <harry.van.haaren@intel.com>; Jain, Deepak K <deepak.k.jain@intel.com>;
> Kozak, KubaX <kubax.kozak@intel.com>
> Subject: [PATCH v6 2/5] ethdev: added new function for xstats ID
> 
> Introduced new function: rte_eth_xstats_get_id_by_name
> to retrieve xstats ids by its names.
> 
> doc: added release note
> 
> Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>

Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

[PATCH v6 3/5] proc-info: add support for new xstats API

[Kuba Kozak]

There is a new argument --xstats-ids and --xstats-name
in proc_info command line to retrieve statistics given by ids
and by name.
E.g. --xstats-ids="1,3,5,7,8"
E.g. --xstats-name rx_errors

ethdev: mark functions as deprecated

Functions rte_eth_xstats_get_all and rte_eth_xstats_get_names_all
are marked as deprecated

Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 app/proc_info/main.c          | 150 ++++++++++++++++++++++++++++++++++++++----
 lib/librte_ether/rte_ethdev.c |   4 +-
 lib/librte_ether/rte_ethdev.h |   2 +
 3 files changed, 143 insertions(+), 13 deletions(-)

diff --git a/app/proc_info/main.c b/app/proc_info/main.c
index 9f5e219..9c9b2b5 100644
--- a/app/proc_info/main.c
+++ b/app/proc_info/main.c
@@ -86,6 +86,14 @@
 static uint32_t reset_xstats;
 /**< Enable memory info. */
 static uint32_t mem_info;
+/**< Enable displaying xstat name. */
+static uint32_t enable_xstats_name;
+static char *xstats_name;
+
+/**< Enable xstats by ids. */
+#define MAX_NB_XSTATS_IDS 1024
+static uint32_t nb_xstats_ids;
+static uint64_t xstats_ids[MAX_NB_XSTATS_IDS];
 
 /**< display usage */
 static void
@@ -99,6 +107,9 @@
 			"default\n"
 		"  --metrics: to display derived metrics of the ports, disabled by "
 			"default\n"
+		"  --xstats-name NAME: to display single xstat value by NAME\n"
+		"  --xstats-ids IDLIST: to display xstat values by id. "
+			"The argument is comma-separated list of xstat ids to print out.\n"
 		"  --stats-reset: to reset port statistics\n"
 		"  --xstats-reset: to reset port extended statistics\n"
 		"  --collectd-format: to print statistics to STDOUT in expected by collectd format\n"
@@ -132,6 +143,33 @@
 
 }
 
+/*
+ * Parse ids value list into array
+ */
+static int
+parse_xstats_ids(char *list, uint64_t *ids, int limit) {
+	int length;
+	char *token;
+	char *ctx = NULL;
+	char *endptr;
+
+	length = 0;
+	token = strtok_r(list, ",", &ctx);
+	while (token != NULL) {
+		ids[length] = strtoull(token, &endptr, 10);
+		if (*endptr != '\0')
+			return -EINVAL;
+
+		length++;
+		if (length >= limit)
+			return -E2BIG;
+
+		token = strtok_r(NULL, ",", &ctx);
+	}
+
+	return length;
+}
+
 static int
 proc_info_preparse_args(int argc, char **argv)
 {
@@ -178,7 +216,9 @@
 		{"xstats", 0, NULL, 0},
 		{"metrics", 0, NULL, 0},
 		{"xstats-reset", 0, NULL, 0},
+		{"xstats-name", required_argument, NULL, 1},
 		{"collectd-format", 0, NULL, 0},
+		{"xstats-ids", 1, NULL, 1},
 		{"host-id", 0, NULL, 0},
 		{NULL, 0, 0, 0}
 	};
@@ -224,7 +264,28 @@
 					MAX_LONG_OPT_SZ))
 				reset_xstats = 1;
 			break;
+		case 1:
+			/* Print xstat single value given by name*/
+			if (!strncmp(long_option[option_index].name,
+					"xstats-name", MAX_LONG_OPT_SZ)) {
+				enable_xstats_name = 1;
+				xstats_name = optarg;
+				printf("name:%s:%s\n",
+						long_option[option_index].name,
+						optarg);
+			} else if (!strncmp(long_option[option_index].name,
+					"xstats-ids",
+					MAX_LONG_OPT_SZ))	{
+				nb_xstats_ids = parse_xstats_ids(optarg,
+						xstats_ids, MAX_NB_XSTATS_IDS);
+
+				if (nb_xstats_ids <= 0) {
+					printf("xstats-id list parse error.\n");
+					return -1;
+				}
 
+			}
+			break;
 		default:
 			proc_info_usage(prgname);
 			return -1;
@@ -351,20 +412,82 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 }
 
 static void
+nic_xstats_by_name_display(uint8_t port_id, char *name)
+{
+	uint64_t id;
+
+	printf("###### NIC statistics for port %-2d, statistic name '%s':\n",
+			   port_id, name);
+
+	if (rte_eth_xstats_get_id_by_name(port_id, name, &id) == 0)
+		printf("%s: %"PRIu64"\n", name, id);
+	else
+		printf("Statistic not found...\n");
+
+}
+
+static void
+nic_xstats_by_ids_display(uint8_t port_id, uint64_t *ids, int len)
+{
+	struct rte_eth_xstat_name *xstats_names;
+	uint64_t *values;
+	int ret, i;
+	static const char *nic_stats_border = "########################";
+
+	values = malloc(sizeof(values) * len);
+	if (values == NULL) {
+		printf("Cannot allocate memory for xstats\n");
+		return;
+	}
+
+	xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
+	if (xstats_names == NULL) {
+		printf("Cannot allocate memory for xstat names\n");
+		free(values);
+		return;
+	}
+
+	if (len != rte_eth_xstats_get_names(
+			port_id, xstats_names, len, ids)) {
+		printf("Cannot get xstat names\n");
+		goto err;
+	}
+
+	printf("###### NIC extended statistics for port %-2d #########\n",
+			   port_id);
+	printf("%s############################\n", nic_stats_border);
+	ret = rte_eth_xstats_get(port_id, ids, values, len);
+	if (ret < 0 || ret > len) {
+		printf("Cannot get xstats\n");
+		goto err;
+	}
+
+	for (i = 0; i < len; i++)
+		printf("%s: %"PRIu64"\n",
+			xstats_names[i].name,
+			values[i]);
+
+	printf("%s############################\n", nic_stats_border);
+err:
+	free(values);
+	free(xstats_names);
+}
+
+static void
 nic_xstats_display(uint8_t port_id)
 {
 	struct rte_eth_xstat_name *xstats_names;
-	struct rte_eth_xstat *xstats;
+	uint64_t *values;
 	int len, ret, i;
 	static const char *nic_stats_border = "########################";
 
-	len = rte_eth_xstats_get_names_all(port_id, NULL, 0);
+	len = rte_eth_xstats_get_names(port_id, NULL, 0, NULL);
 	if (len < 0) {
 		printf("Cannot get xstats count\n");
 		return;
 	}
-	xstats = malloc(sizeof(xstats[0]) * len);
-	if (xstats == NULL) {
+	values = malloc(sizeof(values) * len);
+	if (values == NULL) {
 		printf("Cannot allocate memory for xstats\n");
 		return;
 	}
@@ -372,11 +495,11 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 	xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
 	if (xstats_names == NULL) {
 		printf("Cannot allocate memory for xstat names\n");
-		free(xstats);
+		free(values);
 		return;
 	}
-	if (len != rte_eth_xstats_get_names_all(
-			port_id, xstats_names, len)) {
+	if (len != rte_eth_xstats_get_names(
+			port_id, xstats_names, len, NULL)) {
 		printf("Cannot get xstat names\n");
 		goto err;
 	}
@@ -385,7 +508,7 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 			   port_id);
 	printf("%s############################\n",
 			   nic_stats_border);
-	ret = rte_eth_xstats_get_all(port_id, xstats, len);
+	ret = rte_eth_xstats_get(port_id, NULL, values, len);
 	if (ret < 0 || ret > len) {
 		printf("Cannot get xstats\n");
 		goto err;
@@ -401,18 +524,18 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 						  xstats_names[i].name);
 			sprintf(buf, "PUTVAL %s/dpdkstat-port.%u/%s-%s N:%"
 				PRIu64"\n", host_id, port_id, counter_type,
-				xstats_names[i].name, xstats[i].value);
+				xstats_names[i].name, values[i]);
 			write(stdout_fd, buf, strlen(buf));
 		} else {
 			printf("%s: %"PRIu64"\n", xstats_names[i].name,
-			       xstats[i].value);
+					values[i]);
 		}
 	}
 
 	printf("%s############################\n",
 			   nic_stats_border);
 err:
-	free(xstats);
+	free(values);
 	free(xstats_names);
 }
 
@@ -551,6 +674,11 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 				nic_stats_clear(i);
 			else if (reset_xstats)
 				nic_xstats_clear(i);
+			else if (enable_xstats_name)
+				nic_xstats_by_name_display(i, xstats_name);
+			else if (nb_xstats_ids > 0)
+				nic_xstats_by_ids_display(i, xstats_ids,
+						nb_xstats_ids);
 			else if (enable_metrics)
 				metrics_display(i);
 		}
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index ef30883..0653cf7 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1809,7 +1809,7 @@ struct rte_eth_dev *
 		rte_eth_xstats_get(uint8_t port_id, uint64_t *ids,
 		uint64_t *values, unsigned int n), rte_eth_xstats_get_v1705);
 
-int
+__rte_deprecated int
 rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
 	unsigned int n)
 {
@@ -1832,7 +1832,7 @@ struct rte_eth_dev *
 	return size;
 }
 
-int
+__rte_deprecated int
 rte_eth_xstats_get_names_all(uint8_t port_id,
 		struct rte_eth_xstat_name *xstats_names, unsigned int n)
 {
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 058c435..c6a40ed 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -2389,6 +2389,7 @@ int rte_eth_xstats_get_id_by_name(uint8_t port_id, const char *xstat_name,
  *     shall not be used by the caller.
  *   - A negative value on error (invalid port id).
  */
+__rte_deprecated
 int rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
 	unsigned int n);
 
@@ -2412,6 +2413,7 @@ int rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
  *     shall not be used by the caller.
  *   - A negative value on error (invalid port id).
  */
+__rte_deprecated
 int rte_eth_xstats_get_names_all(uint8_t port_id,
 		struct rte_eth_xstat_name *xstats_names, unsigned int n);
 
-- 
1.9.1

Re: [PATCH v6 3/5] proc-info: add support for new xstats API

[Van Haaren, Harry]

> From: Kozak, KubaX
> Sent: Thursday, April 13, 2017 3:59 PM
> To: dev@dpdk.org
> Cc: Van Haaren, Harry <harry.van.haaren@intel.com>; Jain, Deepak K <deepak.k.jain@intel.com>;
> Kozak, KubaX <kubax.kozak@intel.com>
> Subject: [PATCH v6 3/5] proc-info: add support for new xstats API
> 
> There is a new argument --xstats-ids and --xstats-name
> in proc_info command line to retrieve statistics given by ids
> and by name.
> E.g. --xstats-ids="1,3,5,7,8"
> E.g. --xstats-name rx_errors
> 
> ethdev: mark functions as deprecated
> 
> Functions rte_eth_xstats_get_all and rte_eth_xstats_get_names_all
> are marked as deprecated
> 
> Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>

Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

[PATCH v6 4/5] net/e1000: new xstats API add ID support for e1000

[Kuba Kozak]

From: Jacek Piasecki <jacekx.piasecki@intel.com>

To achieve functionality of retrieving only specific statistics
given by application there are two new functions added:
eth_igb_xstats_get_by_ids() which retrieve
values of statistics specified by ids array
and eth_igb_xstats_get_names_by_ids() which retrieve
names of statistics specified by ids array.

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 drivers/net/e1000/igb_ethdev.c | 92 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 90 insertions(+), 2 deletions(-)

diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index cc2c244..8fed210 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -115,9 +115,13 @@ static void eth_igb_stats_get(struct rte_eth_dev *dev,
 				struct rte_eth_stats *rte_stats);
 static int eth_igb_xstats_get(struct rte_eth_dev *dev,
 			      struct rte_eth_xstat *xstats, unsigned n);
+static int eth_igb_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n);
 static int eth_igb_xstats_get_names(struct rte_eth_dev *dev,
-				    struct rte_eth_xstat_name *xstats_names,
-				    unsigned limit);
+		struct rte_eth_xstat_name *xstats_names, unsigned int limit);
+static int eth_igb_xstats_get_names_by_ids(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+		unsigned int limit);
 static void eth_igb_stats_reset(struct rte_eth_dev *dev);
 static void eth_igb_xstats_reset(struct rte_eth_dev *dev);
 static int eth_igb_fw_version_get(struct rte_eth_dev *dev,
@@ -388,6 +392,8 @@ static void eth_igb_write_ivar(struct e1000_hw *hw, uint8_t msix_vector,
 	.link_update          = eth_igb_link_update,
 	.stats_get            = eth_igb_stats_get,
 	.xstats_get           = eth_igb_xstats_get,
+	.xstats_get_by_ids    = eth_igb_xstats_get_by_ids,
+	.xstats_get_names_by_ids = eth_igb_xstats_get_names_by_ids,
 	.xstats_get_names     = eth_igb_xstats_get_names,
 	.stats_reset          = eth_igb_stats_reset,
 	.xstats_reset         = eth_igb_xstats_reset,
@@ -1846,6 +1852,41 @@ static int eth_igb_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return IGB_NB_XSTATS;
 }
 
+static int eth_igb_xstats_get_names_by_ids(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+		unsigned int limit)
+{
+	unsigned int i;
+
+	if (!ids) {
+		if (xstats_names == NULL)
+			return IGB_NB_XSTATS;
+
+		for (i = 0; i < IGB_NB_XSTATS; i++)
+			snprintf(xstats_names[i].name,
+					sizeof(xstats_names[i].name),
+					"%s", rte_igb_stats_strings[i].name);
+
+		return IGB_NB_XSTATS;
+
+	} else {
+		struct rte_eth_xstat_name xstats_names_copy[IGB_NB_XSTATS];
+
+		eth_igb_xstats_get_names_by_ids(dev, xstats_names_copy, NULL,
+				IGB_NB_XSTATS);
+
+		for (i = 0; i < limit; i++) {
+			if (ids[i] >= IGB_NB_XSTATS) {
+				PMD_INIT_LOG(ERR, "id value isn't valid");
+				return -1;
+			}
+			strcpy(xstats_names[i].name,
+					xstats_names_copy[ids[i]].name);
+		}
+		return limit;
+	}
+}
+
 static int
 eth_igb_xstats_get(struct rte_eth_dev *dev, struct rte_eth_xstat *xstats,
 		   unsigned n)
@@ -1876,6 +1917,53 @@ static int eth_igb_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return IGB_NB_XSTATS;
 }
 
+static int
+eth_igb_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n)
+{
+	unsigned int i;
+
+	if (!ids) {
+		struct e1000_hw *hw =
+			E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+		struct e1000_hw_stats *hw_stats =
+			E1000_DEV_PRIVATE_TO_STATS(dev->data->dev_private);
+
+		if (n < IGB_NB_XSTATS)
+			return IGB_NB_XSTATS;
+
+		igb_read_stats_registers(hw, hw_stats);
+
+		/* If this is a reset xstats is NULL, and we have cleared the
+		 * registers by reading them.
+		 */
+		if (!values)
+			return 0;
+
+		/* Extended stats */
+		for (i = 0; i < IGB_NB_XSTATS; i++)
+			values[i] = *(uint64_t *)(((char *)hw_stats) +
+					rte_igb_stats_strings[i].offset);
+
+		return IGB_NB_XSTATS;
+
+	} else {
+		uint64_t values_copy[IGB_NB_XSTATS];
+
+		eth_igb_xstats_get_by_ids(dev, NULL, values_copy,
+				IGB_NB_XSTATS);
+
+		for (i = 0; i < n; i++) {
+			if (ids[i] >= IGB_NB_XSTATS) {
+				PMD_INIT_LOG(ERR, "id value isn't valid");
+				return -1;
+			}
+			values[i] = values_copy[ids[i]];
+		}
+		return n;
+	}
+}
+
 static void
 igbvf_read_stats_registers(struct e1000_hw *hw, struct e1000_vf_stats *hw_stats)
 {
-- 
1.9.1

Re: [PATCH v6 4/5] net/e1000: new xstats API add ID support for e1000

[Van Haaren, Harry]

> From: Kozak, KubaX
> Sent: Thursday, April 13, 2017 3:59 PM
> To: dev@dpdk.org
> Cc: Van Haaren, Harry <harry.van.haaren@intel.com>; Jain, Deepak K <deepak.k.jain@intel.com>;
> Piasecki, JacekX <jacekx.piasecki@intel.com>; Kozak, KubaX <kubax.kozak@intel.com>
> Subject: [PATCH v6 4/5] net/e1000: new xstats API add ID support for e1000
> 
> From: Jacek Piasecki <jacekx.piasecki@intel.com>
> 
> To achieve functionality of retrieving only specific statistics
> given by application there are two new functions added:
> eth_igb_xstats_get_by_ids() which retrieve
> values of statistics specified by ids array
> and eth_igb_xstats_get_names_by_ids() which retrieve
> names of statistics specified by ids array.
> 
> Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
> Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>

Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

[PATCH v6 5/5] net/ixgbe: new xstats API add ID support for ixgbe

[Kuba Kozak]

From: Jacek Piasecki <jacekx.piasecki@intel.com>

To achieve functionality of retrieving only specific statistics
given by application there are two new functions added:
ixgbe_dev_xstats_get_by_ids() which retrieve
values of statistics specified by ids array
and ixgbe_dev_xstats_get_names_by_ids() which retrieve
names of statistics specified by ids array.

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 179 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 179 insertions(+)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 1462324..76a5499 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -183,12 +183,20 @@ static int ixgbe_dev_xstats_get(struct rte_eth_dev *dev,
 				struct rte_eth_xstat *xstats, unsigned n);
 static int ixgbevf_dev_xstats_get(struct rte_eth_dev *dev,
 				  struct rte_eth_xstat *xstats, unsigned n);
+static int
+ixgbe_dev_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n);
 static void ixgbe_dev_stats_reset(struct rte_eth_dev *dev);
 static void ixgbe_dev_xstats_reset(struct rte_eth_dev *dev);
 static int ixgbe_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, __rte_unused unsigned limit);
 static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, __rte_unused unsigned limit);
+static int ixgbe_dev_xstats_get_names_by_ids(
+	__rte_unused struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names,
+	uint64_t *ids,
+	unsigned int limit);
 static int ixgbe_dev_queue_stats_mapping_set(struct rte_eth_dev *eth_dev,
 					     uint16_t queue_id,
 					     uint8_t stat_idx,
@@ -524,9 +532,11 @@ static int ixgbe_dev_udp_tunnel_port_del(struct rte_eth_dev *dev,
 	.link_update          = ixgbe_dev_link_update,
 	.stats_get            = ixgbe_dev_stats_get,
 	.xstats_get           = ixgbe_dev_xstats_get,
+	.xstats_get_by_ids    = ixgbe_dev_xstats_get_by_ids,
 	.stats_reset          = ixgbe_dev_stats_reset,
 	.xstats_reset         = ixgbe_dev_xstats_reset,
 	.xstats_get_names     = ixgbe_dev_xstats_get_names,
+	.xstats_get_names_by_ids = ixgbe_dev_xstats_get_names_by_ids,
 	.queue_stats_mapping_set = ixgbe_dev_queue_stats_mapping_set,
 	.fw_version_get       = ixgbe_fw_version_get,
 	.dev_infos_get        = ixgbe_dev_info_get,
@@ -3095,6 +3105,84 @@ static int ixgbe_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return cnt_stats;
 }
 
+static int ixgbe_dev_xstats_get_names_by_ids(
+	__rte_unused struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names,
+	uint64_t *ids,
+	unsigned int limit)
+{
+	if (!ids) {
+		const unsigned int cnt_stats = ixgbe_xstats_calc_num();
+		unsigned int stat, i, count;
+
+		if (xstats_names != NULL) {
+			count = 0;
+
+			/* Note: limit >= cnt_stats checked upstream
+			 * in rte_eth_xstats_names()
+			 */
+
+			/* Extended stats from ixgbe_hw_stats */
+			for (i = 0; i < IXGBE_NB_HW_STATS; i++) {
+				snprintf(xstats_names[count].name,
+					sizeof(xstats_names[count].name),
+					"%s",
+					rte_ixgbe_stats_strings[i].name);
+				count++;
+			}
+
+			/* MACsec Stats */
+			for (i = 0; i < IXGBE_NB_MACSEC_STATS; i++) {
+				snprintf(xstats_names[count].name,
+					sizeof(xstats_names[count].name),
+					"%s",
+					rte_ixgbe_macsec_strings[i].name);
+				count++;
+			}
+
+			/* RX Priority Stats */
+			for (stat = 0; stat < IXGBE_NB_RXQ_PRIO_STATS; stat++) {
+				for (i = 0; i < IXGBE_NB_RXQ_PRIO_VALUES; i++) {
+					snprintf(xstats_names[count].name,
+					    sizeof(xstats_names[count].name),
+					    "rx_priority%u_%s", i,
+					    rte_ixgbe_rxq_strings[stat].name);
+					count++;
+				}
+			}
+
+			/* TX Priority Stats */
+			for (stat = 0; stat < IXGBE_NB_TXQ_PRIO_STATS; stat++) {
+				for (i = 0; i < IXGBE_NB_TXQ_PRIO_VALUES; i++) {
+					snprintf(xstats_names[count].name,
+					    sizeof(xstats_names[count].name),
+					    "tx_priority%u_%s", i,
+					    rte_ixgbe_txq_strings[stat].name);
+					count++;
+				}
+			}
+		}
+		return cnt_stats;
+	}
+
+	uint16_t i;
+	uint16_t size = ixgbe_xstats_calc_num();
+	struct rte_eth_xstat_name xstats_names_copy[size];
+
+	ixgbe_dev_xstats_get_names_by_ids(dev, xstats_names_copy, NULL,
+			size);
+
+	for (i = 0; i < limit; i++) {
+		if (ids[i] >= size) {
+			PMD_INIT_LOG(ERR, "id value isn't valid");
+			return -1;
+		}
+		strcpy(xstats_names[i].name,
+				xstats_names_copy[ids[i]].name);
+	}
+	return limit;
+}
+
 static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, unsigned limit)
 {
@@ -3185,6 +3273,97 @@ static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return count;
 }
 
+static int
+ixgbe_dev_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n)
+{
+	if (!ids) {
+		struct ixgbe_hw *hw =
+				IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+		struct ixgbe_hw_stats *hw_stats =
+				IXGBE_DEV_PRIVATE_TO_STATS(
+						dev->data->dev_private);
+		struct ixgbe_macsec_stats *macsec_stats =
+				IXGBE_DEV_PRIVATE_TO_MACSEC_STATS(
+					dev->data->dev_private);
+		uint64_t total_missed_rx, total_qbrc, total_qprc, total_qprdc;
+		unsigned int i, stat, count = 0;
+
+		count = ixgbe_xstats_calc_num();
+
+		if (!ids && n < count)
+			return count;
+
+		total_missed_rx = 0;
+		total_qbrc = 0;
+		total_qprc = 0;
+		total_qprdc = 0;
+
+		ixgbe_read_stats_registers(hw, hw_stats, macsec_stats,
+				&total_missed_rx, &total_qbrc, &total_qprc,
+				&total_qprdc);
+
+		/* If this is a reset xstats is NULL, and we have cleared the
+		 * registers by reading them.
+		 */
+		if (!ids && !values)
+			return 0;
+
+		/* Extended stats from ixgbe_hw_stats */
+		count = 0;
+		for (i = 0; i < IXGBE_NB_HW_STATS; i++) {
+			values[count] = *(uint64_t *)(((char *)hw_stats) +
+					rte_ixgbe_stats_strings[i].offset);
+			count++;
+		}
+
+		/* MACsec Stats */
+		for (i = 0; i < IXGBE_NB_MACSEC_STATS; i++) {
+			values[count] = *(uint64_t *)(((char *)macsec_stats) +
+					rte_ixgbe_macsec_strings[i].offset);
+			count++;
+		}
+
+		/* RX Priority Stats */
+		for (stat = 0; stat < IXGBE_NB_RXQ_PRIO_STATS; stat++) {
+			for (i = 0; i < IXGBE_NB_RXQ_PRIO_VALUES; i++) {
+				values[count] =
+					*(uint64_t *)(((char *)hw_stats) +
+					rte_ixgbe_rxq_strings[stat].offset +
+					(sizeof(uint64_t) * i));
+				count++;
+			}
+		}
+
+		/* TX Priority Stats */
+		for (stat = 0; stat < IXGBE_NB_TXQ_PRIO_STATS; stat++) {
+			for (i = 0; i < IXGBE_NB_TXQ_PRIO_VALUES; i++) {
+				values[count] =
+					*(uint64_t *)(((char *)hw_stats) +
+					rte_ixgbe_txq_strings[stat].offset +
+					(sizeof(uint64_t) * i));
+				count++;
+			}
+		}
+		return count;
+	}
+
+	uint16_t i;
+	uint16_t size = ixgbe_xstats_calc_num();
+	uint64_t values_copy[size];
+
+	ixgbe_dev_xstats_get_by_ids(dev, NULL, values_copy, size);
+
+	for (i = 0; i < n; i++) {
+		if (ids[i] >= size) {
+			PMD_INIT_LOG(ERR, "id value isn't valid");
+			return -1;
+		}
+		values[i] = values_copy[ids[i]];
+	}
+	return n;
+}
+
 static void
 ixgbe_dev_xstats_reset(struct rte_eth_dev *dev)
 {
-- 
1.9.1

Re: [PATCH v6 5/5] net/ixgbe: new xstats API add ID support for ixgbe

[Van Haaren, Harry]

> From: Kozak, KubaX
> Sent: Thursday, April 13, 2017 3:59 PM
> To: dev@dpdk.org
> Cc: Van Haaren, Harry <harry.van.haaren@intel.com>; Jain, Deepak K <deepak.k.jain@intel.com>;
> Piasecki, JacekX <jacekx.piasecki@intel.com>; Kozak, KubaX <kubax.kozak@intel.com>
> Subject: [PATCH v6 5/5] net/ixgbe: new xstats API add ID support for ixgbe
> 
> From: Jacek Piasecki <jacekx.piasecki@intel.com>
> 
> To achieve functionality of retrieving only specific statistics
> given by application there are two new functions added:
> ixgbe_dev_xstats_get_by_ids() which retrieve
> values of statistics specified by ids array
> and ixgbe_dev_xstats_get_names_by_ids() which retrieve
> names of statistics specified by ids array.
> 
> Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
> Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>

Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

Re: [PATCH v6 0/5] Extended xstats API in ethdev library to allow grouping of stats

[Van Haaren, Harry]

> From: Kozak, KubaX
> Sent: Thursday, April 13, 2017 3:59 PM
> To: dev@dpdk.org
> Cc: Van Haaren, Harry <harry.van.haaren@intel.com>; Jain, Deepak K <deepak.k.jain@intel.com>;
> Kozak, KubaX <kubax.kozak@intel.com>
> Subject: [PATCH v6 0/5] Extended xstats API in ethdev library to allow grouping of stats
> 
> Extended xstats API in ethdev library to allow grouping of stats logically
> so they can be retrieved per logical grouping  managed by the application.
> Changed existing functions rte_eth_xstats_get_names and rte_eth_xstats_get
> to use a new list of arguments: array of ids and array of values.
> ABI versioning mechanism was used to support backward compatibility.
> Introduced two new functions rte_eth_xstats_get_all and
> rte_eth_xstats_get_names_all which keeps functionality of the previous
> ones (respectively rte_eth_xstats_get and rte_eth_xstats_get_names)
> but use new API inside. Both functions marked as deprecated.
> Introduced new function: rte_eth_xstats_get_id_by_name to retrieve
> xstats ids by its names.
> Extended functionality of proc_info application:
> --xstats-name NAME: to display single xstat value by NAME
> Updated test-pmd application to use new API.
> 
> v6 changes:
> * patches arrangement in patchset
> * fixes spelling bugs
> * release notes
> 
> v5 changes:
> * fix clang shared build compilation
> * remove wrong versioning macros
> * Makefile LIBABIVER 6 change
> 
> v4 changes:
> * documentation change after API modification
> * fix xstats display for PMD without _by_ids() functions
> * fix ABI validator errors
> 
> v3 changes:
> * checkpatch fixes
> * removed malloc bug in ethdev
> * add new command to proc_info and IDs parsing
> * merged testpmd and proc_info patch with library patch

Please keep Acks when only re-arranging patches and changes.

I'll re-Ack the patches on patchwork now :)

Thanks, -Harry

Re: [PATCH v6 0/5] Extended xstats API in ethdev library to allow grouping of stats

[Thomas Monjalon]

13/04/2017 16:59, Kuba Kozak:
> Extended xstats API in ethdev library to allow grouping of stats logically
> so they can be retrieved per logical grouping  managed by the application.
> Changed existing functions rte_eth_xstats_get_names and rte_eth_xstats_get
> to use a new list of arguments: array of ids and array of values.
> ABI versioning mechanism was used to support backward compatibility.
> Introduced two new functions rte_eth_xstats_get_all and
> rte_eth_xstats_get_names_all which keeps functionality of the previous
> ones (respectively rte_eth_xstats_get and rte_eth_xstats_get_names)
> but use new API inside. Both functions marked as deprecated.
> Introduced new function: rte_eth_xstats_get_id_by_name to retrieve
> xstats ids by its names.
> Extended functionality of proc_info application:
> --xstats-name NAME: to display single xstat value by NAME
> Updated test-pmd application to use new API.

Applied, thanks

Re: [PATCH v6 0/5] Extended xstats API in ethdev library to allow grouping of stats

[Olivier Matz]

Hi,

On Thu, 20 Apr 2017 22:31:35 +0200, Thomas Monjalon <thomas@monjalon.net> wrote:
> 13/04/2017 16:59, Kuba Kozak:
> > Extended xstats API in ethdev library to allow grouping of stats logically
> > so they can be retrieved per logical grouping  managed by the application.
> > Changed existing functions rte_eth_xstats_get_names and rte_eth_xstats_get
> > to use a new list of arguments: array of ids and array of values.
> > ABI versioning mechanism was used to support backward compatibility.
> > Introduced two new functions rte_eth_xstats_get_all and
> > rte_eth_xstats_get_names_all which keeps functionality of the previous
> > ones (respectively rte_eth_xstats_get and rte_eth_xstats_get_names)
> > but use new API inside. Both functions marked as deprecated.
> > Introduced new function: rte_eth_xstats_get_id_by_name to retrieve
> > xstats ids by its names.
> > Extended functionality of proc_info application:
> > --xstats-name NAME: to display single xstat value by NAME
> > Updated test-pmd application to use new API.  
> 
> Applied, thanks

I'm adapting my application to the upcoming dpdk 17.05. I see
several problems with this patchset:

- the API of rte_eth_xstats_get() and rte_eth_xstats_get_names()
  has been modified, and from what I see it was not announced.
  It looks that ABI is preserved however.

- the new functions rte_eth_xstats_get_all() and
  rte_eth_xstats_get_names_all() are marked as deprecated, which
  looks strange for new functions.

About the new api:

int rte_eth_xstats_get(uint8_t port_id, uint64_t *ids, uint64_t *values,
       unsigned int n);

int rte_eth_xstats_get_names(uint8_t port_id,
       struct rte_eth_xstat_name *xstats_names, unsigned int size,
       uint64_t *ids);

- the argument "id" is not at the same place

- why having "size" in one function and "n" in the second (it was
  renamed in the patch)?

- the argument "id" should be const

- a table of uint64_t is returned in place of the struct rte_eth_xstat
  table: if no ids are given, the driver cannot return partial or
  disordered stats anymore. See
  513c78ae3fd6 ("ethdev: fix extended statistics name index")


So, I wonder if it wouldn't be more simple to keep the old
API intact (it would avoid unannounced breakage). The new feature
can be implemented in an additional API:

 rte_eth_xstats_get_by_id(uint8_t port_id, const uint64_t *ids,
       uint64_t *values, unsigned int size)
 rte_eth_xstats_get_names_by_id(uint8_t port_id, const uint64_t *ids,
       struct rte_eth_xstat_name *xstats_names, unsigned int size)

Or:

 rte_eth_xstats_get_by_id(uint8_t port_id, const uint64_t *ids,
       struct rte_eth_xstat *values, unsigned int size)
 rte_eth_xstats_get_names_by_id(uint8_t port_id, const uint64_t *ids,
       struct rte_eth_xstat_name *xstats_names, unsigned int size)

 (which would allow to deprecate the old API, but I'm not sure
  we need to)


Can we fix that for 17.05?

Regards,
Olivier

Re: [PATCH v6 0/5] Extended xstats API in ethdev library to allow grouping of stats

[Thomas Monjalon]

24/04/2017 14:32, Olivier Matz:
> Hi,
> 
> On Thu, 20 Apr 2017 22:31:35 +0200, Thomas Monjalon <thomas@monjalon.net> 
wrote:
> > 13/04/2017 16:59, Kuba Kozak:
> > > Extended xstats API in ethdev library to allow grouping of stats
> > > logically
> > > so they can be retrieved per logical grouping  managed by the
> > > application.
> > > Changed existing functions rte_eth_xstats_get_names and
> > > rte_eth_xstats_get
> > > to use a new list of arguments: array of ids and array of values.
> > > ABI versioning mechanism was used to support backward compatibility.
> > > Introduced two new functions rte_eth_xstats_get_all and
> > > rte_eth_xstats_get_names_all which keeps functionality of the previous
> > > ones (respectively rte_eth_xstats_get and rte_eth_xstats_get_names)
> > > but use new API inside. Both functions marked as deprecated.
> > > Introduced new function: rte_eth_xstats_get_id_by_name to retrieve
> > > xstats ids by its names.
> > > Extended functionality of proc_info application:
> > > --xstats-name NAME: to display single xstat value by NAME
> > > Updated test-pmd application to use new API.
> > 
> > Applied, thanks
> 
> I'm adapting my application to the upcoming dpdk 17.05. I see
> several problems with this patchset:
> 
> - the API of rte_eth_xstats_get() and rte_eth_xstats_get_names()
>   has been modified, and from what I see it was not announced.
>   It looks that ABI is preserved however.
> 
> - the new functions rte_eth_xstats_get_all() and
>   rte_eth_xstats_get_names_all() are marked as deprecated, which
>   looks strange for new functions.
> 
> About the new api:
> 
> int rte_eth_xstats_get(uint8_t port_id, uint64_t *ids, uint64_t *values,
>        unsigned int n);
> 
> int rte_eth_xstats_get_names(uint8_t port_id,
>        struct rte_eth_xstat_name *xstats_names, unsigned int size,
>        uint64_t *ids);
> 
> - the argument "id" is not at the same place
> 
> - why having "size" in one function and "n" in the second (it was
>   renamed in the patch)?
> 
> - the argument "id" should be const
> 
> - a table of uint64_t is returned in place of the struct rte_eth_xstat
>   table: if no ids are given, the driver cannot return partial or
>   disordered stats anymore. See
>   513c78ae3fd6 ("ethdev: fix extended statistics name index")
> 
> 
> So, I wonder if it wouldn't be more simple to keep the old
> API intact (it would avoid unannounced breakage). The new feature
> can be implemented in an additional API:
> 
>  rte_eth_xstats_get_by_id(uint8_t port_id, const uint64_t *ids,
>        uint64_t *values, unsigned int size)
>  rte_eth_xstats_get_names_by_id(uint8_t port_id, const uint64_t *ids,
>        struct rte_eth_xstat_name *xstats_names, unsigned int size)
> 
> Or:
> 
>  rte_eth_xstats_get_by_id(uint8_t port_id, const uint64_t *ids,
>        struct rte_eth_xstat *values, unsigned int size)
>  rte_eth_xstats_get_names_by_id(uint8_t port_id, const uint64_t *ids,
>        struct rte_eth_xstat_name *xstats_names, unsigned int size)
> 
>  (which would allow to deprecate the old API, but I'm not sure
>   we need to)
> 
> 
> Can we fix that for 17.05?

Bottom line is that I have skipped the complete review of this patchset
because it was not properly split, preventing a good review.
Lesson learned: I won't accept anymore a patchset which is not split
enough to allow a proper overview.

Back to the issues, please try to fix it quickly or we should revert
it for 17.05-rc3.

Re: [PATCH v6 0/5] Extended xstats API in ethdev library to allow grouping of stats

[Mcnamara, John]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Thomas Monjalon
> Sent: Monday, April 24, 2017 1:41 PM
> To: Kozak, KubaX <kubax.kozak@intel.com>
> Cc: dev@dpdk.org; Olivier Matz <olivier.matz@6wind.com>; Van Haaren, Harry
> <harry.van.haaren@intel.com>; Jain, Deepak K <deepak.k.jain@intel.com>;
> Piasecki, JacekX <jacekx.piasecki@intel.com>
> Subject: Re: [dpdk-dev] [PATCH v6 0/5] Extended xstats API in ethdev
> library to allow grouping of stats
> 
> 24/04/2017 14:32, Olivier Matz:
> > Hi,
> >
> ...
> > So, I wonder if it wouldn't be more simple to keep the old API intact
> > (it would avoid unannounced breakage). The new feature can be
> > implemented in an additional API:
> >
> >  rte_eth_xstats_get_by_id(uint8_t port_id, const uint64_t *ids,
> >        uint64_t *values, unsigned int size)
> > rte_eth_xstats_get_names_by_id(uint8_t port_id, const uint64_t *ids,
> >        struct rte_eth_xstat_name *xstats_names, unsigned int size)
> >
> > Or:
> >
> >  rte_eth_xstats_get_by_id(uint8_t port_id, const uint64_t *ids,
> >        struct rte_eth_xstat *values, unsigned int size)
> > rte_eth_xstats_get_names_by_id(uint8_t port_id, const uint64_t *ids,
> >        struct rte_eth_xstat_name *xstats_names, unsigned int size)
> >
> >  (which would allow to deprecate the old API, but I'm not sure
> >   we need to)
> >
> >
> > Can we fix that for 17.05?
> 
> ...
> 
> Back to the issues, please try to fix it quickly or we should revert it
> for 17.05-rc3.

Hi,

We'll submit a patch to change the APIs for rte_eth_xstats_get() and 
rte_eth_xstats_get_names() back to their previous signature, without
symbol versions, and add the APIs suggested by Olivier.

We'll work on that as soon as possible.

John 

Re: [PATCH v6 0/5] Extended xstats API in ethdev library to allow grouping of stats

[Roger B Melton]

On 4/24/17 11:49 AM, Mcnamara, John wrote:
>> -----Original Message-----
>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Thomas Monjalon
>> Sent: Monday, April 24, 2017 1:41 PM
>> To: Kozak, KubaX <kubax.kozak@intel.com>
>> Cc: dev@dpdk.org; Olivier Matz <olivier.matz@6wind.com>; Van Haaren, Harry
>> <harry.van.haaren@intel.com>; Jain, Deepak K <deepak.k.jain@intel.com>;
>> Piasecki, JacekX <jacekx.piasecki@intel.com>
>> Subject: Re: [dpdk-dev] [PATCH v6 0/5] Extended xstats API in ethdev
>> library to allow grouping of stats
>>
>> 24/04/2017 14:32, Olivier Matz:
>>> Hi,
>>>
>> ...
>>> So, I wonder if it wouldn't be more simple to keep the old API intact
>>> (it would avoid unannounced breakage). The new feature can be
>>> implemented in an additional API:
>>>
>>>   rte_eth_xstats_get_by_id(uint8_t port_id, const uint64_t *ids,
>>>         uint64_t *values, unsigned int size)
>>> rte_eth_xstats_get_names_by_id(uint8_t port_id, const uint64_t *ids,
>>>         struct rte_eth_xstat_name *xstats_names, unsigned int size)
>>>
>>> Or:
>>>
>>>   rte_eth_xstats_get_by_id(uint8_t port_id, const uint64_t *ids,
>>>         struct rte_eth_xstat *values, unsigned int size)
>>> rte_eth_xstats_get_names_by_id(uint8_t port_id, const uint64_t *ids,
>>>         struct rte_eth_xstat_name *xstats_names, unsigned int size)
>>>
>>>   (which would allow to deprecate the old API, but I'm not sure
>>>    we need to)
>>>
>>>
>>> Can we fix that for 17.05?
>> ...
>>
>> Back to the issues, please try to fix it quickly or we should revert it
>> for 17.05-rc3.
> Hi,
>
> We'll submit a patch to change the APIs for rte_eth_xstats_get() and
> rte_eth_xstats_get_names() back to their previous signature, without
> symbol versions, and add the APIs suggested by Olivier.
>
> We'll work on that as soon as possible.
>
> John
> .
>
Hi folks,

I adapted our application to the API changes presented in 17.05-rc2 and 
encountered problem that I don't think was pointed out in Olivier's list 
of issues.

In our application we call rte_eth_stats_get() with NULL pointers to 
determine the number of xstats.  We use the returned count  to 
pre-allocate buffers for the name strings and xstats values and then 
invoke rte_eth_xstats_get_names() and rte_eth_xstats_get() with pointers 
to appropriately sized buffers and the number of entries available in 
those buffers.

Things appeared to work fine until I requested stats for a net_ixgbe_vf 
port. In that case the initial call to rte_eth_xstats_get() did not 
account for the xstats extensions from the ixgbevf PMD.  Long story 
short, my buffers were undersized and bad things happened.

John,

If you intend to restore the previous API signature but retain the -rc2 
internal implementation, may I suggest that both APIs use the same 
internal function to determine stats count.  Otherwise the potential for 
disagreement between the APIs will remain.

Also while on this topic, IMO the above demonstrates that we really need 
an API to query the xstats count rather than relying on 
rte_eth_xstats_get() or rte_eth_xstats_get_names() with 0'd out arguments.

Regards,
Roger

[PATCH v5 2/3] net/e1000: new xstats API add ID support for e1000

[Michal Jastrzebski]

From: Jacek Piasecki <jacekx.piasecki@intel.com>

To achieve functionality of retrieving only specific statistics
given by application there are two new functions added:
eth_igb_xstats_get_by_ids() which retrieve
values of statistics specified by ids array
and eth_igb_xstats_get_names_by_ids() which retrieve
names of statistics specified by ids array.

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 drivers/net/e1000/igb_ethdev.c | 92 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 90 insertions(+), 2 deletions(-)

diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index cc2c244..8fed210 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -115,9 +115,13 @@ static void eth_igb_stats_get(struct rte_eth_dev *dev,
 				struct rte_eth_stats *rte_stats);
 static int eth_igb_xstats_get(struct rte_eth_dev *dev,
 			      struct rte_eth_xstat *xstats, unsigned n);
+static int eth_igb_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n);
 static int eth_igb_xstats_get_names(struct rte_eth_dev *dev,
-				    struct rte_eth_xstat_name *xstats_names,
-				    unsigned limit);
+		struct rte_eth_xstat_name *xstats_names, unsigned int limit);
+static int eth_igb_xstats_get_names_by_ids(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+		unsigned int limit);
 static void eth_igb_stats_reset(struct rte_eth_dev *dev);
 static void eth_igb_xstats_reset(struct rte_eth_dev *dev);
 static int eth_igb_fw_version_get(struct rte_eth_dev *dev,
@@ -388,6 +392,8 @@ static void eth_igb_write_ivar(struct e1000_hw *hw, uint8_t msix_vector,
 	.link_update          = eth_igb_link_update,
 	.stats_get            = eth_igb_stats_get,
 	.xstats_get           = eth_igb_xstats_get,
+	.xstats_get_by_ids    = eth_igb_xstats_get_by_ids,
+	.xstats_get_names_by_ids = eth_igb_xstats_get_names_by_ids,
 	.xstats_get_names     = eth_igb_xstats_get_names,
 	.stats_reset          = eth_igb_stats_reset,
 	.xstats_reset         = eth_igb_xstats_reset,
@@ -1846,6 +1852,41 @@ static int eth_igb_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return IGB_NB_XSTATS;
 }
 
+static int eth_igb_xstats_get_names_by_ids(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+		unsigned int limit)
+{
+	unsigned int i;
+
+	if (!ids) {
+		if (xstats_names == NULL)
+			return IGB_NB_XSTATS;
+
+		for (i = 0; i < IGB_NB_XSTATS; i++)
+			snprintf(xstats_names[i].name,
+					sizeof(xstats_names[i].name),
+					"%s", rte_igb_stats_strings[i].name);
+
+		return IGB_NB_XSTATS;
+
+	} else {
+		struct rte_eth_xstat_name xstats_names_copy[IGB_NB_XSTATS];
+
+		eth_igb_xstats_get_names_by_ids(dev, xstats_names_copy, NULL,
+				IGB_NB_XSTATS);
+
+		for (i = 0; i < limit; i++) {
+			if (ids[i] >= IGB_NB_XSTATS) {
+				PMD_INIT_LOG(ERR, "id value isn't valid");
+				return -1;
+			}
+			strcpy(xstats_names[i].name,
+					xstats_names_copy[ids[i]].name);
+		}
+		return limit;
+	}
+}
+
 static int
 eth_igb_xstats_get(struct rte_eth_dev *dev, struct rte_eth_xstat *xstats,
 		   unsigned n)
@@ -1876,6 +1917,53 @@ static int eth_igb_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return IGB_NB_XSTATS;
 }
 
+static int
+eth_igb_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n)
+{
+	unsigned int i;
+
+	if (!ids) {
+		struct e1000_hw *hw =
+			E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+		struct e1000_hw_stats *hw_stats =
+			E1000_DEV_PRIVATE_TO_STATS(dev->data->dev_private);
+
+		if (n < IGB_NB_XSTATS)
+			return IGB_NB_XSTATS;
+
+		igb_read_stats_registers(hw, hw_stats);
+
+		/* If this is a reset xstats is NULL, and we have cleared the
+		 * registers by reading them.
+		 */
+		if (!values)
+			return 0;
+
+		/* Extended stats */
+		for (i = 0; i < IGB_NB_XSTATS; i++)
+			values[i] = *(uint64_t *)(((char *)hw_stats) +
+					rte_igb_stats_strings[i].offset);
+
+		return IGB_NB_XSTATS;
+
+	} else {
+		uint64_t values_copy[IGB_NB_XSTATS];
+
+		eth_igb_xstats_get_by_ids(dev, NULL, values_copy,
+				IGB_NB_XSTATS);
+
+		for (i = 0; i < n; i++) {
+			if (ids[i] >= IGB_NB_XSTATS) {
+				PMD_INIT_LOG(ERR, "id value isn't valid");
+				return -1;
+			}
+			values[i] = values_copy[ids[i]];
+		}
+		return n;
+	}
+}
+
 static void
 igbvf_read_stats_registers(struct e1000_hw *hw, struct e1000_vf_stats *hw_stats)
 {
-- 
1.9.1

Re: [PATCH v5 2/3] net/e1000: new xstats API add ID support for e1000

[Van Haaren, Harry]

> From: Jastrzebski, MichalX K
> Sent: Tuesday, April 11, 2017 5:37 PM
> To: dev@dpdk.org
> Cc: Jain, Deepak K <deepak.k.jain@intel.com>; Van Haaren, Harry <harry.van.haaren@intel.com>;
> Piasecki, JacekX <jacekx.piasecki@intel.com>; Kozak, KubaX <kubax.kozak@intel.com>
> Subject: [PATCH v5 2/3] net/e1000: new xstats API add ID support for e1000
> 
> From: Jacek Piasecki <jacekx.piasecki@intel.com>
> 
> To achieve functionality of retrieving only specific statistics
> given by application there are two new functions added:
> eth_igb_xstats_get_by_ids() which retrieve
> values of statistics specified by ids array
> and eth_igb_xstats_get_names_by_ids() which retrieve
> names of statistics specified by ids array.
> 
> Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
> Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>

Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

[PATCH v5 3/3] net/ixgbe: new xstats API add ID support for ixgbe

[Michal Jastrzebski]

From: Jacek Piasecki <jacekx.piasecki@intel.com>

To achieve functionality of retrieving only specific statistics
given by application there are two new functions added:
ixgbe_dev_xstats_get_by_ids() which retrieve
values of statistics specified by ids array
and ixgbe_dev_xstats_get_names_by_ids() which retrieve
names of statistics specified by ids array.

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 179 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 179 insertions(+)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 1462324..76a5499 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -183,12 +183,20 @@ static int ixgbe_dev_xstats_get(struct rte_eth_dev *dev,
 				struct rte_eth_xstat *xstats, unsigned n);
 static int ixgbevf_dev_xstats_get(struct rte_eth_dev *dev,
 				  struct rte_eth_xstat *xstats, unsigned n);
+static int
+ixgbe_dev_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n);
 static void ixgbe_dev_stats_reset(struct rte_eth_dev *dev);
 static void ixgbe_dev_xstats_reset(struct rte_eth_dev *dev);
 static int ixgbe_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, __rte_unused unsigned limit);
 static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, __rte_unused unsigned limit);
+static int ixgbe_dev_xstats_get_names_by_ids(
+	__rte_unused struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names,
+	uint64_t *ids,
+	unsigned int limit);
 static int ixgbe_dev_queue_stats_mapping_set(struct rte_eth_dev *eth_dev,
 					     uint16_t queue_id,
 					     uint8_t stat_idx,
@@ -524,9 +532,11 @@ static int ixgbe_dev_udp_tunnel_port_del(struct rte_eth_dev *dev,
 	.link_update          = ixgbe_dev_link_update,
 	.stats_get            = ixgbe_dev_stats_get,
 	.xstats_get           = ixgbe_dev_xstats_get,
+	.xstats_get_by_ids    = ixgbe_dev_xstats_get_by_ids,
 	.stats_reset          = ixgbe_dev_stats_reset,
 	.xstats_reset         = ixgbe_dev_xstats_reset,
 	.xstats_get_names     = ixgbe_dev_xstats_get_names,
+	.xstats_get_names_by_ids = ixgbe_dev_xstats_get_names_by_ids,
 	.queue_stats_mapping_set = ixgbe_dev_queue_stats_mapping_set,
 	.fw_version_get       = ixgbe_fw_version_get,
 	.dev_infos_get        = ixgbe_dev_info_get,
@@ -3095,6 +3105,84 @@ static int ixgbe_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return cnt_stats;
 }
 
+static int ixgbe_dev_xstats_get_names_by_ids(
+	__rte_unused struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names,
+	uint64_t *ids,
+	unsigned int limit)
+{
+	if (!ids) {
+		const unsigned int cnt_stats = ixgbe_xstats_calc_num();
+		unsigned int stat, i, count;
+
+		if (xstats_names != NULL) {
+			count = 0;
+
+			/* Note: limit >= cnt_stats checked upstream
+			 * in rte_eth_xstats_names()
+			 */
+
+			/* Extended stats from ixgbe_hw_stats */
+			for (i = 0; i < IXGBE_NB_HW_STATS; i++) {
+				snprintf(xstats_names[count].name,
+					sizeof(xstats_names[count].name),
+					"%s",
+					rte_ixgbe_stats_strings[i].name);
+				count++;
+			}
+
+			/* MACsec Stats */
+			for (i = 0; i < IXGBE_NB_MACSEC_STATS; i++) {
+				snprintf(xstats_names[count].name,
+					sizeof(xstats_names[count].name),
+					"%s",
+					rte_ixgbe_macsec_strings[i].name);
+				count++;
+			}
+
+			/* RX Priority Stats */
+			for (stat = 0; stat < IXGBE_NB_RXQ_PRIO_STATS; stat++) {
+				for (i = 0; i < IXGBE_NB_RXQ_PRIO_VALUES; i++) {
+					snprintf(xstats_names[count].name,
+					    sizeof(xstats_names[count].name),
+					    "rx_priority%u_%s", i,
+					    rte_ixgbe_rxq_strings[stat].name);
+					count++;
+				}
+			}
+
+			/* TX Priority Stats */
+			for (stat = 0; stat < IXGBE_NB_TXQ_PRIO_STATS; stat++) {
+				for (i = 0; i < IXGBE_NB_TXQ_PRIO_VALUES; i++) {
+					snprintf(xstats_names[count].name,
+					    sizeof(xstats_names[count].name),
+					    "tx_priority%u_%s", i,
+					    rte_ixgbe_txq_strings[stat].name);
+					count++;
+				}
+			}
+		}
+		return cnt_stats;
+	}
+
+	uint16_t i;
+	uint16_t size = ixgbe_xstats_calc_num();
+	struct rte_eth_xstat_name xstats_names_copy[size];
+
+	ixgbe_dev_xstats_get_names_by_ids(dev, xstats_names_copy, NULL,
+			size);
+
+	for (i = 0; i < limit; i++) {
+		if (ids[i] >= size) {
+			PMD_INIT_LOG(ERR, "id value isn't valid");
+			return -1;
+		}
+		strcpy(xstats_names[i].name,
+				xstats_names_copy[ids[i]].name);
+	}
+	return limit;
+}
+
 static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, unsigned limit)
 {
@@ -3185,6 +3273,97 @@ static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return count;
 }
 
+static int
+ixgbe_dev_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n)
+{
+	if (!ids) {
+		struct ixgbe_hw *hw =
+				IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+		struct ixgbe_hw_stats *hw_stats =
+				IXGBE_DEV_PRIVATE_TO_STATS(
+						dev->data->dev_private);
+		struct ixgbe_macsec_stats *macsec_stats =
+				IXGBE_DEV_PRIVATE_TO_MACSEC_STATS(
+					dev->data->dev_private);
+		uint64_t total_missed_rx, total_qbrc, total_qprc, total_qprdc;
+		unsigned int i, stat, count = 0;
+
+		count = ixgbe_xstats_calc_num();
+
+		if (!ids && n < count)
+			return count;
+
+		total_missed_rx = 0;
+		total_qbrc = 0;
+		total_qprc = 0;
+		total_qprdc = 0;
+
+		ixgbe_read_stats_registers(hw, hw_stats, macsec_stats,
+				&total_missed_rx, &total_qbrc, &total_qprc,
+				&total_qprdc);
+
+		/* If this is a reset xstats is NULL, and we have cleared the
+		 * registers by reading them.
+		 */
+		if (!ids && !values)
+			return 0;
+
+		/* Extended stats from ixgbe_hw_stats */
+		count = 0;
+		for (i = 0; i < IXGBE_NB_HW_STATS; i++) {
+			values[count] = *(uint64_t *)(((char *)hw_stats) +
+					rte_ixgbe_stats_strings[i].offset);
+			count++;
+		}
+
+		/* MACsec Stats */
+		for (i = 0; i < IXGBE_NB_MACSEC_STATS; i++) {
+			values[count] = *(uint64_t *)(((char *)macsec_stats) +
+					rte_ixgbe_macsec_strings[i].offset);
+			count++;
+		}
+
+		/* RX Priority Stats */
+		for (stat = 0; stat < IXGBE_NB_RXQ_PRIO_STATS; stat++) {
+			for (i = 0; i < IXGBE_NB_RXQ_PRIO_VALUES; i++) {
+				values[count] =
+					*(uint64_t *)(((char *)hw_stats) +
+					rte_ixgbe_rxq_strings[stat].offset +
+					(sizeof(uint64_t) * i));
+				count++;
+			}
+		}
+
+		/* TX Priority Stats */
+		for (stat = 0; stat < IXGBE_NB_TXQ_PRIO_STATS; stat++) {
+			for (i = 0; i < IXGBE_NB_TXQ_PRIO_VALUES; i++) {
+				values[count] =
+					*(uint64_t *)(((char *)hw_stats) +
+					rte_ixgbe_txq_strings[stat].offset +
+					(sizeof(uint64_t) * i));
+				count++;
+			}
+		}
+		return count;
+	}
+
+	uint16_t i;
+	uint16_t size = ixgbe_xstats_calc_num();
+	uint64_t values_copy[size];
+
+	ixgbe_dev_xstats_get_by_ids(dev, NULL, values_copy, size);
+
+	for (i = 0; i < n; i++) {
+		if (ids[i] >= size) {
+			PMD_INIT_LOG(ERR, "id value isn't valid");
+			return -1;
+		}
+		values[i] = values_copy[ids[i]];
+	}
+	return n;
+}
+
 static void
 ixgbe_dev_xstats_reset(struct rte_eth_dev *dev)
 {
-- 
1.9.1

Re: [PATCH v5 3/3] net/ixgbe: new xstats API add ID support for ixgbe

[Van Haaren, Harry]

> From: Jastrzebski, MichalX K
> Sent: Tuesday, April 11, 2017 5:37 PM
> To: dev@dpdk.org
> Cc: Jain, Deepak K <deepak.k.jain@intel.com>; Van Haaren, Harry <harry.van.haaren@intel.com>;
> Piasecki, JacekX <jacekx.piasecki@intel.com>; Kozak, KubaX <kubax.kozak@intel.com>
> Subject: [PATCH v5 3/3] net/ixgbe: new xstats API add ID support for ixgbe
> 
> From: Jacek Piasecki <jacekx.piasecki@intel.com>
> 
> To achieve functionality of retrieving only specific statistics
> given by application there are two new functions added:
> ixgbe_dev_xstats_get_by_ids() which retrieve
> values of statistics specified by ids array
> and ixgbe_dev_xstats_get_names_by_ids() which retrieve
> names of statistics specified by ids array.
> 
> Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
> Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>

Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

[PATCH v4 2/3] net/e1000: new xstats API add ID support for e1000

[Jacek Piasecki]

To achieve functionality of retrieving only specific statistics
given by application there are two new functions added:
eth_igb_xstats_get_by_ids() which retrieve
values of statistics specified by ids array
and eth_igb_xstats_get_names_by_ids() which retrieve
names of statistics specified by ids array.

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 drivers/net/e1000/igb_ethdev.c | 92 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 90 insertions(+), 2 deletions(-)

diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index cc2c244..8fed210 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -115,9 +115,13 @@ static void eth_igb_stats_get(struct rte_eth_dev *dev,
 				struct rte_eth_stats *rte_stats);
 static int eth_igb_xstats_get(struct rte_eth_dev *dev,
 			      struct rte_eth_xstat *xstats, unsigned n);
+static int eth_igb_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n);
 static int eth_igb_xstats_get_names(struct rte_eth_dev *dev,
-				    struct rte_eth_xstat_name *xstats_names,
-				    unsigned limit);
+		struct rte_eth_xstat_name *xstats_names, unsigned int limit);
+static int eth_igb_xstats_get_names_by_ids(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+		unsigned int limit);
 static void eth_igb_stats_reset(struct rte_eth_dev *dev);
 static void eth_igb_xstats_reset(struct rte_eth_dev *dev);
 static int eth_igb_fw_version_get(struct rte_eth_dev *dev,
@@ -388,6 +392,8 @@ static void eth_igb_write_ivar(struct e1000_hw *hw, uint8_t msix_vector,
 	.link_update          = eth_igb_link_update,
 	.stats_get            = eth_igb_stats_get,
 	.xstats_get           = eth_igb_xstats_get,
+	.xstats_get_by_ids    = eth_igb_xstats_get_by_ids,
+	.xstats_get_names_by_ids = eth_igb_xstats_get_names_by_ids,
 	.xstats_get_names     = eth_igb_xstats_get_names,
 	.stats_reset          = eth_igb_stats_reset,
 	.xstats_reset         = eth_igb_xstats_reset,
@@ -1846,6 +1852,41 @@ static int eth_igb_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return IGB_NB_XSTATS;
 }
 
+static int eth_igb_xstats_get_names_by_ids(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+		unsigned int limit)
+{
+	unsigned int i;
+
+	if (!ids) {
+		if (xstats_names == NULL)
+			return IGB_NB_XSTATS;
+
+		for (i = 0; i < IGB_NB_XSTATS; i++)
+			snprintf(xstats_names[i].name,
+					sizeof(xstats_names[i].name),
+					"%s", rte_igb_stats_strings[i].name);
+
+		return IGB_NB_XSTATS;
+
+	} else {
+		struct rte_eth_xstat_name xstats_names_copy[IGB_NB_XSTATS];
+
+		eth_igb_xstats_get_names_by_ids(dev, xstats_names_copy, NULL,
+				IGB_NB_XSTATS);
+
+		for (i = 0; i < limit; i++) {
+			if (ids[i] >= IGB_NB_XSTATS) {
+				PMD_INIT_LOG(ERR, "id value isn't valid");
+				return -1;
+			}
+			strcpy(xstats_names[i].name,
+					xstats_names_copy[ids[i]].name);
+		}
+		return limit;
+	}
+}
+
 static int
 eth_igb_xstats_get(struct rte_eth_dev *dev, struct rte_eth_xstat *xstats,
 		   unsigned n)
@@ -1876,6 +1917,53 @@ static int eth_igb_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return IGB_NB_XSTATS;
 }
 
+static int
+eth_igb_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n)
+{
+	unsigned int i;
+
+	if (!ids) {
+		struct e1000_hw *hw =
+			E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+		struct e1000_hw_stats *hw_stats =
+			E1000_DEV_PRIVATE_TO_STATS(dev->data->dev_private);
+
+		if (n < IGB_NB_XSTATS)
+			return IGB_NB_XSTATS;
+
+		igb_read_stats_registers(hw, hw_stats);
+
+		/* If this is a reset xstats is NULL, and we have cleared the
+		 * registers by reading them.
+		 */
+		if (!values)
+			return 0;
+
+		/* Extended stats */
+		for (i = 0; i < IGB_NB_XSTATS; i++)
+			values[i] = *(uint64_t *)(((char *)hw_stats) +
+					rte_igb_stats_strings[i].offset);
+
+		return IGB_NB_XSTATS;
+
+	} else {
+		uint64_t values_copy[IGB_NB_XSTATS];
+
+		eth_igb_xstats_get_by_ids(dev, NULL, values_copy,
+				IGB_NB_XSTATS);
+
+		for (i = 0; i < n; i++) {
+			if (ids[i] >= IGB_NB_XSTATS) {
+				PMD_INIT_LOG(ERR, "id value isn't valid");
+				return -1;
+			}
+			values[i] = values_copy[ids[i]];
+		}
+		return n;
+	}
+}
+
 static void
 igbvf_read_stats_registers(struct e1000_hw *hw, struct e1000_vf_stats *hw_stats)
 {
-- 
1.9.1

[PATCH v4 3/3] net/ixgbe: new xstats API add ID support for ixgbe

[Jacek Piasecki]

To achieve functionality of retrieving only specific statistics
given by application there are two new functions added:
ixgbe_dev_xstats_get_by_ids() which retrieve
values of statistics specified by ids array
and ixgbe_dev_xstats_get_names_by_ids() which retrieve
names of statistics specified by ids array.

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 179 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 179 insertions(+)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 1462324..76a5499 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -183,12 +183,20 @@ static int ixgbe_dev_xstats_get(struct rte_eth_dev *dev,
 				struct rte_eth_xstat *xstats, unsigned n);
 static int ixgbevf_dev_xstats_get(struct rte_eth_dev *dev,
 				  struct rte_eth_xstat *xstats, unsigned n);
+static int
+ixgbe_dev_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n);
 static void ixgbe_dev_stats_reset(struct rte_eth_dev *dev);
 static void ixgbe_dev_xstats_reset(struct rte_eth_dev *dev);
 static int ixgbe_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, __rte_unused unsigned limit);
 static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, __rte_unused unsigned limit);
+static int ixgbe_dev_xstats_get_names_by_ids(
+	__rte_unused struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names,
+	uint64_t *ids,
+	unsigned int limit);
 static int ixgbe_dev_queue_stats_mapping_set(struct rte_eth_dev *eth_dev,
 					     uint16_t queue_id,
 					     uint8_t stat_idx,
@@ -524,9 +532,11 @@ static int ixgbe_dev_udp_tunnel_port_del(struct rte_eth_dev *dev,
 	.link_update          = ixgbe_dev_link_update,
 	.stats_get            = ixgbe_dev_stats_get,
 	.xstats_get           = ixgbe_dev_xstats_get,
+	.xstats_get_by_ids    = ixgbe_dev_xstats_get_by_ids,
 	.stats_reset          = ixgbe_dev_stats_reset,
 	.xstats_reset         = ixgbe_dev_xstats_reset,
 	.xstats_get_names     = ixgbe_dev_xstats_get_names,
+	.xstats_get_names_by_ids = ixgbe_dev_xstats_get_names_by_ids,
 	.queue_stats_mapping_set = ixgbe_dev_queue_stats_mapping_set,
 	.fw_version_get       = ixgbe_fw_version_get,
 	.dev_infos_get        = ixgbe_dev_info_get,
@@ -3095,6 +3105,84 @@ static int ixgbe_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return cnt_stats;
 }
 
+static int ixgbe_dev_xstats_get_names_by_ids(
+	__rte_unused struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names,
+	uint64_t *ids,
+	unsigned int limit)
+{
+	if (!ids) {
+		const unsigned int cnt_stats = ixgbe_xstats_calc_num();
+		unsigned int stat, i, count;
+
+		if (xstats_names != NULL) {
+			count = 0;
+
+			/* Note: limit >= cnt_stats checked upstream
+			 * in rte_eth_xstats_names()
+			 */
+
+			/* Extended stats from ixgbe_hw_stats */
+			for (i = 0; i < IXGBE_NB_HW_STATS; i++) {
+				snprintf(xstats_names[count].name,
+					sizeof(xstats_names[count].name),
+					"%s",
+					rte_ixgbe_stats_strings[i].name);
+				count++;
+			}
+
+			/* MACsec Stats */
+			for (i = 0; i < IXGBE_NB_MACSEC_STATS; i++) {
+				snprintf(xstats_names[count].name,
+					sizeof(xstats_names[count].name),
+					"%s",
+					rte_ixgbe_macsec_strings[i].name);
+				count++;
+			}
+
+			/* RX Priority Stats */
+			for (stat = 0; stat < IXGBE_NB_RXQ_PRIO_STATS; stat++) {
+				for (i = 0; i < IXGBE_NB_RXQ_PRIO_VALUES; i++) {
+					snprintf(xstats_names[count].name,
+					    sizeof(xstats_names[count].name),
+					    "rx_priority%u_%s", i,
+					    rte_ixgbe_rxq_strings[stat].name);
+					count++;
+				}
+			}
+
+			/* TX Priority Stats */
+			for (stat = 0; stat < IXGBE_NB_TXQ_PRIO_STATS; stat++) {
+				for (i = 0; i < IXGBE_NB_TXQ_PRIO_VALUES; i++) {
+					snprintf(xstats_names[count].name,
+					    sizeof(xstats_names[count].name),
+					    "tx_priority%u_%s", i,
+					    rte_ixgbe_txq_strings[stat].name);
+					count++;
+				}
+			}
+		}
+		return cnt_stats;
+	}
+
+	uint16_t i;
+	uint16_t size = ixgbe_xstats_calc_num();
+	struct rte_eth_xstat_name xstats_names_copy[size];
+
+	ixgbe_dev_xstats_get_names_by_ids(dev, xstats_names_copy, NULL,
+			size);
+
+	for (i = 0; i < limit; i++) {
+		if (ids[i] >= size) {
+			PMD_INIT_LOG(ERR, "id value isn't valid");
+			return -1;
+		}
+		strcpy(xstats_names[i].name,
+				xstats_names_copy[ids[i]].name);
+	}
+	return limit;
+}
+
 static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, unsigned limit)
 {
@@ -3185,6 +3273,97 @@ static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return count;
 }
 
+static int
+ixgbe_dev_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n)
+{
+	if (!ids) {
+		struct ixgbe_hw *hw =
+				IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+		struct ixgbe_hw_stats *hw_stats =
+				IXGBE_DEV_PRIVATE_TO_STATS(
+						dev->data->dev_private);
+		struct ixgbe_macsec_stats *macsec_stats =
+				IXGBE_DEV_PRIVATE_TO_MACSEC_STATS(
+					dev->data->dev_private);
+		uint64_t total_missed_rx, total_qbrc, total_qprc, total_qprdc;
+		unsigned int i, stat, count = 0;
+
+		count = ixgbe_xstats_calc_num();
+
+		if (!ids && n < count)
+			return count;
+
+		total_missed_rx = 0;
+		total_qbrc = 0;
+		total_qprc = 0;
+		total_qprdc = 0;
+
+		ixgbe_read_stats_registers(hw, hw_stats, macsec_stats,
+				&total_missed_rx, &total_qbrc, &total_qprc,
+				&total_qprdc);
+
+		/* If this is a reset xstats is NULL, and we have cleared the
+		 * registers by reading them.
+		 */
+		if (!ids && !values)
+			return 0;
+
+		/* Extended stats from ixgbe_hw_stats */
+		count = 0;
+		for (i = 0; i < IXGBE_NB_HW_STATS; i++) {
+			values[count] = *(uint64_t *)(((char *)hw_stats) +
+					rte_ixgbe_stats_strings[i].offset);
+			count++;
+		}
+
+		/* MACsec Stats */
+		for (i = 0; i < IXGBE_NB_MACSEC_STATS; i++) {
+			values[count] = *(uint64_t *)(((char *)macsec_stats) +
+					rte_ixgbe_macsec_strings[i].offset);
+			count++;
+		}
+
+		/* RX Priority Stats */
+		for (stat = 0; stat < IXGBE_NB_RXQ_PRIO_STATS; stat++) {
+			for (i = 0; i < IXGBE_NB_RXQ_PRIO_VALUES; i++) {
+				values[count] =
+					*(uint64_t *)(((char *)hw_stats) +
+					rte_ixgbe_rxq_strings[stat].offset +
+					(sizeof(uint64_t) * i));
+				count++;
+			}
+		}
+
+		/* TX Priority Stats */
+		for (stat = 0; stat < IXGBE_NB_TXQ_PRIO_STATS; stat++) {
+			for (i = 0; i < IXGBE_NB_TXQ_PRIO_VALUES; i++) {
+				values[count] =
+					*(uint64_t *)(((char *)hw_stats) +
+					rte_ixgbe_txq_strings[stat].offset +
+					(sizeof(uint64_t) * i));
+				count++;
+			}
+		}
+		return count;
+	}
+
+	uint16_t i;
+	uint16_t size = ixgbe_xstats_calc_num();
+	uint64_t values_copy[size];
+
+	ixgbe_dev_xstats_get_by_ids(dev, NULL, values_copy, size);
+
+	for (i = 0; i < n; i++) {
+		if (ids[i] >= size) {
+			PMD_INIT_LOG(ERR, "id value isn't valid");
+			return -1;
+		}
+		values[i] = values_copy[ids[i]];
+	}
+	return n;
+}
+
 static void
 ixgbe_dev_xstats_reset(struct rte_eth_dev *dev)
 {
-- 
1.9.1

[PATCH v3 2/3] add new xstats API id support for e1000

[Jacek Piasecki]

From: Michal Jastrzebski <michalx.k.jastrzebski@intel.com>

To achieve functionality of retrieving only specific statistics
given by application there are two new functions added:
eth_igb_xstats_get_by_ids() which retrieve
values of statistics specified by ids array
and eth_igb_xstats_get_names_by_ids() which retrieve
names of statistics specified by ids array.

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 drivers/net/e1000/igb_ethdev.c | 92 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 90 insertions(+), 2 deletions(-)

diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index 71d05a9..f45cb9a 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -115,9 +115,13 @@ static void eth_igb_stats_get(struct rte_eth_dev *dev,
 				struct rte_eth_stats *rte_stats);
 static int eth_igb_xstats_get(struct rte_eth_dev *dev,
 			      struct rte_eth_xstat *xstats, unsigned n);
+static int eth_igb_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n);
 static int eth_igb_xstats_get_names(struct rte_eth_dev *dev,
-				    struct rte_eth_xstat_name *xstats_names,
-				    unsigned limit);
+		struct rte_eth_xstat_name *xstats_names, unsigned int limit);
+static int eth_igb_xstats_get_names_by_ids(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+		unsigned int limit);
 static void eth_igb_stats_reset(struct rte_eth_dev *dev);
 static void eth_igb_xstats_reset(struct rte_eth_dev *dev);
 static int eth_igb_fw_version_get(struct rte_eth_dev *dev,
@@ -390,6 +394,8 @@ static void eth_igbvf_interrupt_handler(struct rte_intr_handle *handle,
 	.link_update          = eth_igb_link_update,
 	.stats_get            = eth_igb_stats_get,
 	.xstats_get           = eth_igb_xstats_get,
+	.xstats_get_by_ids    = eth_igb_xstats_get_by_ids,
+	.xstats_get_names_by_ids = eth_igb_xstats_get_names_by_ids,
 	.xstats_get_names     = eth_igb_xstats_get_names,
 	.stats_reset          = eth_igb_stats_reset,
 	.xstats_reset         = eth_igb_xstats_reset,
@@ -1846,6 +1852,41 @@ static int eth_igb_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return IGB_NB_XSTATS;
 }
 
+static int eth_igb_xstats_get_names_by_ids(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+		unsigned int limit)
+{
+	unsigned int i;
+
+	if (!ids) {
+		if (xstats_names == NULL)
+			return IGB_NB_XSTATS;
+
+		for (i = 0; i < IGB_NB_XSTATS; i++)
+			snprintf(xstats_names[i].name,
+					sizeof(xstats_names[i].name),
+					"%s", rte_igb_stats_strings[i].name);
+
+		return IGB_NB_XSTATS;
+
+	} else {
+		struct rte_eth_xstat_name xstats_names_copy[IGB_NB_XSTATS];
+
+		eth_igb_xstats_get_names_by_ids(dev, xstats_names_copy, NULL,
+				IGB_NB_XSTATS);
+
+		for (i = 0; i < limit; i++) {
+			if (ids[i] >= IGB_NB_XSTATS) {
+				PMD_INIT_LOG(ERR, "id value isn't valid");
+				return -1;
+			}
+			strcpy(xstats_names[i].name,
+					xstats_names_copy[ids[i]].name);
+		}
+		return limit;
+	}
+}
+
 static int
 eth_igb_xstats_get(struct rte_eth_dev *dev, struct rte_eth_xstat *xstats,
 		   unsigned n)
@@ -1876,6 +1917,53 @@ static int eth_igb_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return IGB_NB_XSTATS;
 }
 
+static int
+eth_igb_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n)
+{
+	unsigned int i;
+
+	if (!ids) {
+		struct e1000_hw *hw =
+			E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+		struct e1000_hw_stats *hw_stats =
+			E1000_DEV_PRIVATE_TO_STATS(dev->data->dev_private);
+
+		if (n < IGB_NB_XSTATS)
+			return IGB_NB_XSTATS;
+
+		igb_read_stats_registers(hw, hw_stats);
+
+		/* If this is a reset xstats is NULL, and we have cleared the
+		 * registers by reading them.
+		 */
+		if (!values)
+			return 0;
+
+		/* Extended stats */
+		for (i = 0; i < IGB_NB_XSTATS; i++)
+			values[i] = *(uint64_t *)(((char *)hw_stats) +
+					rte_igb_stats_strings[i].offset);
+
+		return IGB_NB_XSTATS;
+
+	} else {
+		uint64_t values_copy[IGB_NB_XSTATS];
+
+		eth_igb_xstats_get_by_ids(dev, NULL, values_copy,
+				IGB_NB_XSTATS);
+
+		for (i = 0; i < n; i++) {
+			if (ids[i] >= IGB_NB_XSTATS) {
+				PMD_INIT_LOG(ERR, "id value isn't valid");
+				return -1;
+			}
+			values[i] = values_copy[ids[i]];
+		}
+		return n;
+	}
+}
+
 static void
 igbvf_read_stats_registers(struct e1000_hw *hw, struct e1000_vf_stats *hw_stats)
 {
-- 
1.9.1

Re: [PATCH v3 2/3] add new xstats API id support for e1000

[Van Haaren, Harry]

> From: Piasecki, JacekX
> Sent: Monday, April 3, 2017 1:10 PM
> To: dev@dpdk.org
> Cc: Van Haaren, Harry <harry.van.haaren@intel.com>; Jastrzebski, MichalX K
> <michalx.k.jastrzebski@intel.com>; Piasecki, JacekX <jacekx.piasecki@intel.com>; Kozak, KubaX
> <kubax.kozak@intel.com>
> Subject: [PATCH v3 2/3] add new xstats API id support for e1000
> 
> From: Michal Jastrzebski <michalx.k.jastrzebski@intel.com>
> 
> To achieve functionality of retrieving only specific statistics
> given by application there are two new functions added:
> eth_igb_xstats_get_by_ids() which retrieve
> values of statistics specified by ids array
> and eth_igb_xstats_get_names_by_ids() which retrieve
> names of statistics specified by ids array.
> 
> Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
> Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>

Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

[PATCH v3 3/3] add new xstats API id support for ixgbe

[Jacek Piasecki]

From: Michal Jastrzebski <michalx.k.jastrzebski@intel.com>

To achieve functionality of retrieving only specific statistics
given by application there are two new functions added:
ixgbe_dev_xstats_get_by_ids() which retrieve
values of statistics specified by ids array
and ixgbe_dev_xstats_get_names_by_ids() which retrieve
names of statistics specified by ids array.

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 179 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 179 insertions(+)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 7169007..9ee0260 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -189,12 +189,20 @@ static int ixgbe_dev_xstats_get(struct rte_eth_dev *dev,
 				struct rte_eth_xstat *xstats, unsigned n);
 static int ixgbevf_dev_xstats_get(struct rte_eth_dev *dev,
 				  struct rte_eth_xstat *xstats, unsigned n);
+static int
+ixgbe_dev_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n);
 static void ixgbe_dev_stats_reset(struct rte_eth_dev *dev);
 static void ixgbe_dev_xstats_reset(struct rte_eth_dev *dev);
 static int ixgbe_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, __rte_unused unsigned limit);
 static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, __rte_unused unsigned limit);
+static int ixgbe_dev_xstats_get_names_by_ids(
+	__rte_unused struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names,
+	uint64_t *ids,
+	unsigned int limit);
 static int ixgbe_dev_queue_stats_mapping_set(struct rte_eth_dev *eth_dev,
 					     uint16_t queue_id,
 					     uint8_t stat_idx,
@@ -532,9 +540,11 @@ static int ixgbe_dev_udp_tunnel_port_del(struct rte_eth_dev *dev,
 	.link_update          = ixgbe_dev_link_update,
 	.stats_get            = ixgbe_dev_stats_get,
 	.xstats_get           = ixgbe_dev_xstats_get,
+	.xstats_get_by_ids    = ixgbe_dev_xstats_get_by_ids,
 	.stats_reset          = ixgbe_dev_stats_reset,
 	.xstats_reset         = ixgbe_dev_xstats_reset,
 	.xstats_get_names     = ixgbe_dev_xstats_get_names,
+	.xstats_get_names_by_ids = ixgbe_dev_xstats_get_names_by_ids,
 	.queue_stats_mapping_set = ixgbe_dev_queue_stats_mapping_set,
 	.fw_version_get       = ixgbe_fw_version_get,
 	.dev_infos_get        = ixgbe_dev_info_get,
@@ -3094,6 +3104,84 @@ static int ixgbe_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return cnt_stats;
 }
 
+static int ixgbe_dev_xstats_get_names_by_ids(
+	__rte_unused struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names,
+	uint64_t *ids,
+	unsigned int limit)
+{
+	if (!ids) {
+		const unsigned int cnt_stats = ixgbe_xstats_calc_num();
+		unsigned int stat, i, count;
+
+		if (xstats_names != NULL) {
+			count = 0;
+
+			/* Note: limit >= cnt_stats checked upstream
+			 * in rte_eth_xstats_names()
+			 */
+
+			/* Extended stats from ixgbe_hw_stats */
+			for (i = 0; i < IXGBE_NB_HW_STATS; i++) {
+				snprintf(xstats_names[count].name,
+					sizeof(xstats_names[count].name),
+					"%s",
+					rte_ixgbe_stats_strings[i].name);
+				count++;
+			}
+
+			/* MACsec Stats */
+			for (i = 0; i < IXGBE_NB_MACSEC_STATS; i++) {
+				snprintf(xstats_names[count].name,
+					sizeof(xstats_names[count].name),
+					"%s",
+					rte_ixgbe_macsec_strings[i].name);
+				count++;
+			}
+
+			/* RX Priority Stats */
+			for (stat = 0; stat < IXGBE_NB_RXQ_PRIO_STATS; stat++) {
+				for (i = 0; i < IXGBE_NB_RXQ_PRIO_VALUES; i++) {
+					snprintf(xstats_names[count].name,
+					    sizeof(xstats_names[count].name),
+					    "rx_priority%u_%s", i,
+					    rte_ixgbe_rxq_strings[stat].name);
+					count++;
+				}
+			}
+
+			/* TX Priority Stats */
+			for (stat = 0; stat < IXGBE_NB_TXQ_PRIO_STATS; stat++) {
+				for (i = 0; i < IXGBE_NB_TXQ_PRIO_VALUES; i++) {
+					snprintf(xstats_names[count].name,
+					    sizeof(xstats_names[count].name),
+					    "tx_priority%u_%s", i,
+					    rte_ixgbe_txq_strings[stat].name);
+					count++;
+				}
+			}
+		}
+		return cnt_stats;
+	}
+
+	uint16_t i;
+	uint16_t size = ixgbe_xstats_calc_num();
+	struct rte_eth_xstat_name xstats_names_copy[size];
+
+	ixgbe_dev_xstats_get_names_by_ids(dev, xstats_names_copy, NULL,
+			size);
+
+	for (i = 0; i < limit; i++) {
+		if (ids[i] >= size) {
+			PMD_INIT_LOG(ERR, "id value isn't valid");
+			return -1;
+		}
+		strcpy(xstats_names[i].name,
+				xstats_names_copy[ids[i]].name);
+	}
+	return limit;
+}
+
 static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, unsigned limit)
 {
@@ -3184,6 +3272,97 @@ static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return count;
 }
 
+static int
+ixgbe_dev_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n)
+{
+	if (!ids) {
+		struct ixgbe_hw *hw =
+				IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+		struct ixgbe_hw_stats *hw_stats =
+				IXGBE_DEV_PRIVATE_TO_STATS(
+						dev->data->dev_private);
+		struct ixgbe_macsec_stats *macsec_stats =
+				IXGBE_DEV_PRIVATE_TO_MACSEC_STATS(
+					dev->data->dev_private);
+		uint64_t total_missed_rx, total_qbrc, total_qprc, total_qprdc;
+		unsigned int i, stat, count = 0;
+
+		count = ixgbe_xstats_calc_num();
+
+		if (!ids && n < count)
+			return count;
+
+		total_missed_rx = 0;
+		total_qbrc = 0;
+		total_qprc = 0;
+		total_qprdc = 0;
+
+		ixgbe_read_stats_registers(hw, hw_stats, macsec_stats,
+				&total_missed_rx, &total_qbrc, &total_qprc,
+				&total_qprdc);
+
+		/* If this is a reset xstats is NULL, and we have cleared the
+		 * registers by reading them.
+		 */
+		if (!ids && !values)
+			return 0;
+
+		/* Extended stats from ixgbe_hw_stats */
+		count = 0;
+		for (i = 0; i < IXGBE_NB_HW_STATS; i++) {
+			values[count] = *(uint64_t *)(((char *)hw_stats) +
+					rte_ixgbe_stats_strings[i].offset);
+			count++;
+		}
+
+		/* MACsec Stats */
+		for (i = 0; i < IXGBE_NB_MACSEC_STATS; i++) {
+			values[count] = *(uint64_t *)(((char *)macsec_stats) +
+					rte_ixgbe_macsec_strings[i].offset);
+			count++;
+		}
+
+		/* RX Priority Stats */
+		for (stat = 0; stat < IXGBE_NB_RXQ_PRIO_STATS; stat++) {
+			for (i = 0; i < IXGBE_NB_RXQ_PRIO_VALUES; i++) {
+				values[count] =
+					*(uint64_t *)(((char *)hw_stats) +
+					rte_ixgbe_rxq_strings[stat].offset +
+					(sizeof(uint64_t) * i));
+				count++;
+			}
+		}
+
+		/* TX Priority Stats */
+		for (stat = 0; stat < IXGBE_NB_TXQ_PRIO_STATS; stat++) {
+			for (i = 0; i < IXGBE_NB_TXQ_PRIO_VALUES; i++) {
+				values[count] =
+					*(uint64_t *)(((char *)hw_stats) +
+					rte_ixgbe_txq_strings[stat].offset +
+					(sizeof(uint64_t) * i));
+				count++;
+			}
+		}
+		return count;
+	}
+
+	uint16_t i;
+	uint16_t size = ixgbe_xstats_calc_num();
+	uint64_t values_copy[size];
+
+	ixgbe_dev_xstats_get_by_ids(dev, NULL, values_copy, size);
+
+	for (i = 0; i < n; i++) {
+		if (ids[i] >= size) {
+			PMD_INIT_LOG(ERR, "id value isn't valid");
+			return -1;
+		}
+		values[i] = values_copy[ids[i]];
+	}
+	return n;
+}
+
 static void
 ixgbe_dev_xstats_reset(struct rte_eth_dev *dev)
 {
-- 
1.9.1

Re: [PATCH v3 3/3] add new xstats API id support for ixgbe

[Van Haaren, Harry]

> From: Piasecki, JacekX
> Sent: Monday, April 3, 2017 1:10 PM
> To: dev@dpdk.org
> Cc: Van Haaren, Harry <harry.van.haaren@intel.com>; Jastrzebski, MichalX K
> <michalx.k.jastrzebski@intel.com>; Piasecki, JacekX <jacekx.piasecki@intel.com>; Kozak, KubaX
> <kubax.kozak@intel.com>
> Subject: [PATCH v3 3/3] add new xstats API id support for ixgbe
> 
> From: Michal Jastrzebski <michalx.k.jastrzebski@intel.com>
> 
> To achieve functionality of retrieving only specific statistics
> given by application there are two new functions added:
> ixgbe_dev_xstats_get_by_ids() which retrieve
> values of statistics specified by ids array
> and ixgbe_dev_xstats_get_names_by_ids() which retrieve
> names of statistics specified by ids array.
> 
> Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
> Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>

Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

[PATCH v2 2/5] add new xstats API id support for e1000

[Michal Jastrzebski]

Add new xstats API id support for e1000

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 drivers/net/e1000/igb_ethdev.c | 92 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 90 insertions(+), 2 deletions(-)

diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index 71d05a9..d62cde7 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -115,9 +115,13 @@ static void eth_igb_stats_get(struct rte_eth_dev *dev,
 				struct rte_eth_stats *rte_stats);
 static int eth_igb_xstats_get(struct rte_eth_dev *dev,
 			      struct rte_eth_xstat *xstats, unsigned n);
+static int eth_igb_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n);
 static int eth_igb_xstats_get_names(struct rte_eth_dev *dev,
-				    struct rte_eth_xstat_name *xstats_names,
-				    unsigned limit);
+		struct rte_eth_xstat_name *xstats_names, unsigned int limit);
+static int eth_igb_xstats_get_names_by_ids(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+		unsigned int limit);
 static void eth_igb_stats_reset(struct rte_eth_dev *dev);
 static void eth_igb_xstats_reset(struct rte_eth_dev *dev);
 static int eth_igb_fw_version_get(struct rte_eth_dev *dev,
@@ -390,6 +394,8 @@ static void eth_igbvf_interrupt_handler(struct rte_intr_handle *handle,
 	.link_update          = eth_igb_link_update,
 	.stats_get            = eth_igb_stats_get,
 	.xstats_get           = eth_igb_xstats_get,
+	.xstats_get_by_ids    = eth_igb_xstats_get_by_ids,
+	.xstats_get_names_by_ids = eth_igb_xstats_get_names_by_ids,
 	.xstats_get_names     = eth_igb_xstats_get_names,
 	.stats_reset          = eth_igb_stats_reset,
 	.xstats_reset         = eth_igb_xstats_reset,
@@ -1846,6 +1852,42 @@ static int eth_igb_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return IGB_NB_XSTATS;
 }
 
+static int eth_igb_xstats_get_names_by_ids(struct rte_eth_dev *dev,
+		struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+		unsigned int limit)
+{
+	unsigned int i;
+
+	if (!ids) {
+
+		if (xstats_names == NULL)
+			return IGB_NB_XSTATS;
+
+		for (i = 0; i < IGB_NB_XSTATS; i++)
+			snprintf(xstats_names[i].name,
+					sizeof(xstats_names[i].name),
+					"%s", rte_igb_stats_strings[i].name);
+
+		return IGB_NB_XSTATS;
+
+	} else {
+		struct rte_eth_xstat_name xstats_names_copy[IGB_NB_XSTATS];
+
+		eth_igb_xstats_get_names_by_ids(dev, xstats_names_copy, NULL,
+				IGB_NB_XSTATS);
+
+		for (i = 0; i < limit; i++) {
+			if (ids[i] >= IGB_NB_XSTATS) {
+				printf("ERROR: id value isn't valid \n");
+				return -1;
+			}
+			strcpy(xstats_names[i].name,
+					xstats_names_copy[ids[i]].name);
+		}
+		return limit;
+	}
+}
+
 static int
 eth_igb_xstats_get(struct rte_eth_dev *dev, struct rte_eth_xstat *xstats,
 		   unsigned n)
@@ -1876,6 +1918,52 @@ static int eth_igb_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return IGB_NB_XSTATS;
 }
 
+static int
+eth_igb_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned int n)
+{
+	unsigned int i;
+
+	if (!ids) {
+		struct e1000_hw *hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+		struct e1000_hw_stats *hw_stats =
+				E1000_DEV_PRIVATE_TO_STATS(dev->data->dev_private);
+
+		if (n < IGB_NB_XSTATS)
+			return IGB_NB_XSTATS;
+
+		igb_read_stats_registers(hw, hw_stats);
+
+		/* If this is a reset xstats is NULL, and we have cleared the
+		 * registers by reading them.
+		 */
+		if (!values)
+			return 0;
+
+		/* Extended stats */
+		for (i = 0; i < IGB_NB_XSTATS; i++)
+			values[i] = *(uint64_t *)(((char *)hw_stats) +
+					rte_igb_stats_strings[i].offset);
+
+		return IGB_NB_XSTATS;
+
+	} else {
+		uint64_t values_copy[IGB_NB_XSTATS];
+
+		eth_igb_xstats_get_by_ids(dev, NULL, values_copy,
+				IGB_NB_XSTATS);
+
+		for (i = 0; i < n; i++) {
+			if (ids[i] >= IGB_NB_XSTATS) {
+				printf("ERROR: id value isn't valid \n");
+				return -1;
+			}
+			values[i] = values_copy[ids[i]];
+		}
+		return n;
+	}
+}
+
 static void
 igbvf_read_stats_registers(struct e1000_hw *hw, struct e1000_vf_stats *hw_stats)
 {
-- 
1.9.1

[PATCH v2 3/5] add new xstats API id support for ixgbe

[Michal Jastrzebski]

add new xstats API id support for ixgbe

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 178 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 7169007..54e2fe1 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -189,12 +189,19 @@ static int ixgbe_dev_xstats_get(struct rte_eth_dev *dev,
 				struct rte_eth_xstat *xstats, unsigned n);
 static int ixgbevf_dev_xstats_get(struct rte_eth_dev *dev,
 				  struct rte_eth_xstat *xstats, unsigned n);
+static int
+ixgbe_dev_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned n);
 static void ixgbe_dev_stats_reset(struct rte_eth_dev *dev);
 static void ixgbe_dev_xstats_reset(struct rte_eth_dev *dev);
 static int ixgbe_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, __rte_unused unsigned limit);
 static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, __rte_unused unsigned limit);
+static int ixgbe_dev_xstats_get_names_by_ids(__rte_unused struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names,
+	uint64_t *ids,
+	unsigned limit);
 static int ixgbe_dev_queue_stats_mapping_set(struct rte_eth_dev *eth_dev,
 					     uint16_t queue_id,
 					     uint8_t stat_idx,
@@ -532,9 +539,11 @@ static int ixgbe_dev_udp_tunnel_port_del(struct rte_eth_dev *dev,
 	.link_update          = ixgbe_dev_link_update,
 	.stats_get            = ixgbe_dev_stats_get,
 	.xstats_get           = ixgbe_dev_xstats_get,
+	.xstats_get_by_ids    = ixgbe_dev_xstats_get_by_ids,
 	.stats_reset          = ixgbe_dev_stats_reset,
 	.xstats_reset         = ixgbe_dev_xstats_reset,
 	.xstats_get_names     = ixgbe_dev_xstats_get_names,
+	.xstats_get_names_by_ids = ixgbe_dev_xstats_get_names_by_ids,
 	.queue_stats_mapping_set = ixgbe_dev_queue_stats_mapping_set,
 	.fw_version_get       = ixgbe_fw_version_get,
 	.dev_infos_get        = ixgbe_dev_info_get,
@@ -3094,6 +3103,85 @@ static int ixgbe_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return cnt_stats;
 }
 
+static int ixgbe_dev_xstats_get_names_by_ids(
+	__rte_unused struct rte_eth_dev *dev,
+	struct rte_eth_xstat_name *xstats_names,
+	uint64_t *ids,
+	unsigned limit)
+{
+	if (!ids) {
+		const unsigned cnt_stats = ixgbe_xstats_calc_num();
+		unsigned stat, i, count;
+
+		if (xstats_names != NULL) {
+			count = 0;
+
+			/* Note: limit >= cnt_stats checked upstream
+			 * in rte_eth_xstats_names()
+			 */
+
+			/* Extended stats from ixgbe_hw_stats */
+			for (i = 0; i < IXGBE_NB_HW_STATS; i++) {
+				snprintf(xstats_names[count].name,
+					sizeof(xstats_names[count].name),
+					"%s",
+					rte_ixgbe_stats_strings[i].name);
+				count++;
+			}
+
+			/* MACsec Stats */
+			for (i = 0; i < IXGBE_NB_MACSEC_STATS; i++) {
+				snprintf(xstats_names[count].name,
+					sizeof(xstats_names[count].name),
+					"%s",
+					rte_ixgbe_macsec_strings[i].name);
+				count++;
+			}
+
+			/* RX Priority Stats */
+			for (stat = 0; stat < IXGBE_NB_RXQ_PRIO_STATS; stat++) {
+				for (i = 0; i < IXGBE_NB_RXQ_PRIO_VALUES; i++) {
+					snprintf(xstats_names[count].name,
+					    sizeof(xstats_names[count].name),
+					    "rx_priority%u_%s", i,
+					    rte_ixgbe_rxq_strings[stat].name);
+					count++;
+				}
+			}
+
+			/* TX Priority Stats */
+			for (stat = 0; stat < IXGBE_NB_TXQ_PRIO_STATS; stat++) {
+				for (i = 0; i < IXGBE_NB_TXQ_PRIO_VALUES; i++) {
+					snprintf(xstats_names[count].name,
+					    sizeof(xstats_names[count].name),
+					    "tx_priority%u_%s", i,
+					    rte_ixgbe_txq_strings[stat].name);
+					count++;
+				}
+			}
+		}
+		return cnt_stats;
+	}
+	else {
+		uint16_t i;
+		uint16_t size = ixgbe_xstats_calc_num();
+		struct rte_eth_xstat_name xstats_names_copy[size];
+
+		ixgbe_dev_xstats_get_names_by_ids(dev, xstats_names_copy, NULL,
+				size);
+
+		for (i = 0; i < limit; i++) {
+			if (ids[i] >= size) {
+				printf("ERROR: id value isn't valid \n");
+				return -1;
+			}
+			strcpy(xstats_names[i].name,
+					xstats_names_copy[ids[i]].name);
+		}
+		return limit;
+	}
+}
+
 static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct rte_eth_xstat_name *xstats_names, unsigned limit)
 {
@@ -3184,6 +3272,96 @@ static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	return count;
 }
 
+static int
+ixgbe_dev_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+		uint64_t *values, unsigned n)
+{
+	if (!ids) {
+		struct ixgbe_hw *hw =
+				IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+		struct ixgbe_hw_stats *hw_stats =
+				IXGBE_DEV_PRIVATE_TO_STATS(dev->data->dev_private);
+		struct ixgbe_macsec_stats *macsec_stats =
+				IXGBE_DEV_PRIVATE_TO_MACSEC_STATS(
+					dev->data->dev_private);
+		uint64_t total_missed_rx, total_qbrc, total_qprc, total_qprdc;
+		unsigned i, stat, count = 0;
+
+		count = ixgbe_xstats_calc_num();
+
+		if (!ids && n < count)
+			return count;
+
+		total_missed_rx = 0;
+		total_qbrc = 0;
+		total_qprc = 0;
+		total_qprdc = 0;
+
+		ixgbe_read_stats_registers(hw, hw_stats, macsec_stats, &total_missed_rx,
+				&total_qbrc, &total_qprc, &total_qprdc);
+
+		/* If this is a reset xstats is NULL, and we have cleared the
+		 * registers by reading them.
+		 */
+		if (!ids && !values) {
+			return 0;
+		}
+
+
+		/* Extended stats from ixgbe_hw_stats */
+		count = 0;
+		for (i = 0; i < IXGBE_NB_HW_STATS; i++) {
+			values[count] = *(uint64_t *)(((char *)hw_stats) +
+					rte_ixgbe_stats_strings[i].offset);
+			count++;
+		}
+
+		/* MACsec Stats */
+		for (i = 0; i < IXGBE_NB_MACSEC_STATS; i++) {
+			values[count] = *(uint64_t *)(((char *)macsec_stats) +
+					rte_ixgbe_macsec_strings[i].offset);
+			count++;
+		}
+
+		/* RX Priority Stats */
+		for (stat = 0; stat < IXGBE_NB_RXQ_PRIO_STATS; stat++) {
+			for (i = 0; i < IXGBE_NB_RXQ_PRIO_VALUES; i++) {
+				values[count] = *(uint64_t *)(((char *)hw_stats) +
+						rte_ixgbe_rxq_strings[stat].offset +
+						(sizeof(uint64_t) * i));
+				count++;
+			}
+		}
+
+		/* TX Priority Stats */
+		for (stat = 0; stat < IXGBE_NB_TXQ_PRIO_STATS; stat++) {
+			for (i = 0; i < IXGBE_NB_TXQ_PRIO_VALUES; i++) {
+				values[count] = *(uint64_t *)(((char *)hw_stats) +
+						rte_ixgbe_txq_strings[stat].offset +
+						(sizeof(uint64_t) * i));
+				count++;
+			}
+		}
+		return count;
+	}
+	else {
+		uint16_t i;
+		uint16_t size = ixgbe_xstats_calc_num();
+		uint64_t values_copy[size];
+
+		ixgbe_dev_xstats_get_by_ids(dev, NULL, values_copy, size);
+
+		for (i = 0; i < n; i++) {
+			if (ids[i] >= size) {
+				printf("ERROR: id value isn't valid \n");
+				return -1;
+			}
+			values[i] = values_copy[ids[i]];
+		}
+		return n;
+	}
+}
+
 static void
 ixgbe_dev_xstats_reset(struct rte_eth_dev *dev)
 {
-- 
1.9.1

[PATCH v2 4/5] add support for new xstats API retrieving by id

[Michal Jastrzebski]

Add support for new xstats API retrieving by id to proc_info
application

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 app/proc_info/main.c | 56 +++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 45 insertions(+), 11 deletions(-)

diff --git a/app/proc_info/main.c b/app/proc_info/main.c
index ef2098d..22fcca0 100644
--- a/app/proc_info/main.c
+++ b/app/proc_info/main.c
@@ -83,6 +83,9 @@
 static uint32_t reset_xstats;
 /**< Enable memory info. */
 static uint32_t mem_info;
+/**< Enable displaying xstat name. */
+static uint32_t enable_xstats_name;
+static char *xstats_name;
 
 /**< display usage */
 static void
@@ -94,6 +97,7 @@
 		"  --stats: to display port statistics, enabled by default\n"
 		"  --xstats: to display extended port statistics, disabled by "
 			"default\n"
+		"  --xstats-name NAME: to display single xstat value by NAME\n"
 		"  --stats-reset: to reset port statistics\n"
 		"  --xstats-reset: to reset port extended statistics\n"
 		"  --collectd-format: to print statistics to STDOUT in expected by collectd format\n"
@@ -172,6 +176,7 @@
 		{"stats-reset", 0, NULL, 0},
 		{"xstats", 0, NULL, 0},
 		{"xstats-reset", 0, NULL, 0},
+		{"xstats-name", required_argument, NULL, 1},
 		{"collectd-format", 0, NULL, 0},
 		{"host-id", 0, NULL, 0},
 		{NULL, 0, 0, 0}
@@ -214,7 +219,18 @@
 					MAX_LONG_OPT_SZ))
 				reset_xstats = 1;
 			break;
-
+		case 1:
+			/* Print xstat single value given by name*/
+			if (!strncmp(long_option[option_index].name,
+					"xstats-name",
+					MAX_LONG_OPT_SZ))	{
+				enable_xstats_name = 1;
+				xstats_name = optarg;
+				printf("name:%s:%s\n",
+						long_option[option_index].name,
+						optarg);
+			}
+			break;
 		default:
 			proc_info_usage(prgname);
 			return -1;
@@ -341,20 +357,36 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 }
 
 static void
+nic_xstats_by_name_display(__rte_unused uint8_t port_id,
+		__rte_unused char *name)
+{
+	uint64_t id;
+
+	printf("###### NIC statistics for port %-2d, statistic name '%s':\n",
+			   port_id, name);
+
+	if (rte_eth_xstats_get_id_by_name(port_id, name, &id) == 0)
+		printf("%s: %"PRIu64"\n", name, id);
+	else
+		printf("Statistic not found...\n");
+
+}
+
+static void
 nic_xstats_display(uint8_t port_id)
 {
 	struct rte_eth_xstat_name *xstats_names;
-	struct rte_eth_xstat *xstats;
+	uint64_t *values;
 	int len, ret, i;
 	static const char *nic_stats_border = "########################";
 
-	len = rte_eth_xstats_get_names(port_id, NULL, 0);
+	len = rte_eth_xstats_get_names(port_id, NULL, NULL, 0);
 	if (len < 0) {
 		printf("Cannot get xstats count\n");
 		return;
 	}
-	xstats = malloc(sizeof(xstats[0]) * len);
-	if (xstats == NULL) {
+	values = malloc(sizeof(values) * len);
+	if (values == NULL) {
 		printf("Cannot allocate memory for xstats\n");
 		return;
 	}
@@ -362,11 +394,11 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 	xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
 	if (xstats_names == NULL) {
 		printf("Cannot allocate memory for xstat names\n");
-		free(xstats);
+		free(values);
 		return;
 	}
 	if (len != rte_eth_xstats_get_names(
-			port_id, xstats_names, len)) {
+			port_id, xstats_names, NULL, len)) {
 		printf("Cannot get xstat names\n");
 		goto err;
 	}
@@ -375,7 +407,7 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 			   port_id);
 	printf("%s############################\n",
 			   nic_stats_border);
-	ret = rte_eth_xstats_get(port_id, xstats, len);
+	ret = rte_eth_xstats_get(port_id, NULL, values, len);
 	if (ret < 0 || ret > len) {
 		printf("Cannot get xstats\n");
 		goto err;
@@ -391,18 +423,18 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 						  xstats_names[i].name);
 			sprintf(buf, "PUTVAL %s/dpdkstat-port.%u/%s-%s N:%"
 				PRIu64"\n", host_id, port_id, counter_type,
-				xstats_names[i].name, xstats[i].value);
+				xstats_names[i].name, values[i]);
 			write(stdout_fd, buf, strlen(buf));
 		} else {
 			printf("%s: %"PRIu64"\n", xstats_names[i].name,
-			       xstats[i].value);
+					values[i]);
 		}
 	}
 
 	printf("%s############################\n",
 			   nic_stats_border);
 err:
-	free(xstats);
+	free(values);
 	free(xstats_names);
 }
 
@@ -480,6 +512,8 @@ static void collectd_resolve_cnt_type(char *cnt_type, size_t cnt_type_len,
 				nic_stats_clear(i);
 			else if (reset_xstats)
 				nic_xstats_clear(i);
+			else if (enable_xstats_name)
+				nic_xstats_by_name_display(i, xstats_name);
 		}
 	}
 
-- 
1.9.1

[PATCH v2 5/5] add support for new xstats API retrieving by id

[Michal Jastrzebski]

Add support for new xstats API retrieving by id in
testpmd application

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
---
 app/test-pmd/config.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 80491fc..d94a580 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -264,9 +264,9 @@ struct rss_type_info {
 void
 nic_xstats_display(portid_t port_id)
 {
-	struct rte_eth_xstat *xstats;
 	int cnt_xstats, idx_xstat;
 	struct rte_eth_xstat_name *xstats_names;
+	uint64_t *values;
 
 	printf("###### NIC extended statistics for port %-2d\n", port_id);
 	if (!rte_eth_dev_is_valid_port(port_id)) {
@@ -275,7 +275,7 @@ struct rss_type_info {
 	}
 
 	/* Get count */
-	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, 0);
+	cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, NULL, 0);
 	if (cnt_xstats  < 0) {
 		printf("Error: Cannot get count of xstats\n");
 		return;
@@ -288,23 +288,23 @@ struct rss_type_info {
 		return;
 	}
 	if (cnt_xstats != rte_eth_xstats_get_names(
-			port_id, xstats_names, cnt_xstats)) {
+			port_id, xstats_names, NULL, cnt_xstats)) {
 		printf("Error: Cannot get xstats lookup\n");
 		free(xstats_names);
 		return;
 	}
 
 	/* Get stats themselves */
-	xstats = malloc(sizeof(struct rte_eth_xstat) * cnt_xstats);
-	if (xstats == NULL) {
+	values = malloc(sizeof(values) * cnt_xstats);
+	if (values == NULL) {
 		printf("Cannot allocate memory for xstats\n");
 		free(xstats_names);
 		return;
 	}
-	if (cnt_xstats != rte_eth_xstats_get(port_id, xstats, cnt_xstats)) {
+	if (cnt_xstats != rte_eth_xstats_get(port_id, NULL, values, cnt_xstats)) {
 		printf("Error: Unable to get xstats\n");
 		free(xstats_names);
-		free(xstats);
+		free(values);
 		return;
 	}
 
@@ -312,9 +312,9 @@ struct rss_type_info {
 	for (idx_xstat = 0; idx_xstat < cnt_xstats; idx_xstat++)
 		printf("%s: %"PRIu64"\n",
 			xstats_names[idx_xstat].name,
-			xstats[idx_xstat].value);
+			values[idx_xstat]);
 	free(xstats_names);
-	free(xstats);
+	free(values);
 }
 
 void
-- 
1.9.1