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

[Michal Jastrzebski <michalx.k.jastrzebski@intel.com>]

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