[PATCH v3 2/6] ethdev: add a function to look up Tx offload names

[Andrew Rybchenko <arybchenko@solarflare.com>]

From: Ivan Malov <ivan.malov@oktetlabs.ru>

Commonly, drivers converted to the new offload API
may need to log unsupported offloads as a response
to wrong settings. From this perspective, it would
be convenient to have generic functions to look up
offload names. The patch adds such a helper for Tx.

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

Cc: Thomas Monjalon <thomas@monjalon.net>
Cc: Ferruh Yigit <ferruh.yigit@intel.com>
Cc: Shahaf Shuler <shahafs@mellanox.com>
---
 lib/librte_ether/rte_ethdev.c           | 45 +++++++++++++++++++++++++++++++++
 lib/librte_ether/rte_ethdev.h           | 18 +++++++++++++
 lib/librte_ether/rte_ethdev_version.map |  1 +
 3 files changed, 64 insertions(+)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 9e9ef83..cd4a3ed 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -116,6 +116,35 @@ static const struct {
 
 #undef RTE_RX_OFFLOAD_BIT2STR
 
+#define RTE_TX_OFFLOAD_BIT2STR(_name)	\
+	{ DEV_TX_OFFLOAD_##_name, #_name }
+
+static const struct {
+	uint64_t offload;
+	const char *name;
+} rte_tx_offload_names[] = {
+	RTE_TX_OFFLOAD_BIT2STR(VLAN_INSERT),
+	RTE_TX_OFFLOAD_BIT2STR(IPV4_CKSUM),
+	RTE_TX_OFFLOAD_BIT2STR(UDP_CKSUM),
+	RTE_TX_OFFLOAD_BIT2STR(TCP_CKSUM),
+	RTE_TX_OFFLOAD_BIT2STR(SCTP_CKSUM),
+	RTE_TX_OFFLOAD_BIT2STR(TCP_TSO),
+	RTE_TX_OFFLOAD_BIT2STR(UDP_TSO),
+	RTE_TX_OFFLOAD_BIT2STR(OUTER_IPV4_CKSUM),
+	RTE_TX_OFFLOAD_BIT2STR(QINQ_INSERT),
+	RTE_TX_OFFLOAD_BIT2STR(VXLAN_TNL_TSO),
+	RTE_TX_OFFLOAD_BIT2STR(GRE_TNL_TSO),
+	RTE_TX_OFFLOAD_BIT2STR(IPIP_TNL_TSO),
+	RTE_TX_OFFLOAD_BIT2STR(GENEVE_TNL_TSO),
+	RTE_TX_OFFLOAD_BIT2STR(MACSEC_INSERT),
+	RTE_TX_OFFLOAD_BIT2STR(MT_LOCKFREE),
+	RTE_TX_OFFLOAD_BIT2STR(MULTI_SEGS),
+	RTE_TX_OFFLOAD_BIT2STR(MBUF_FAST_FREE),
+	RTE_TX_OFFLOAD_BIT2STR(SECURITY),
+};
+
+#undef RTE_TX_OFFLOAD_BIT2STR
+
 /**
  * The user application callback description.
  *
@@ -788,6 +817,22 @@ rte_eth_dev_rx_offload_name(uint64_t offload)
 	return name;
 }
 
+const char *
+rte_eth_dev_tx_offload_name(uint64_t offload)
+{
+	const char *name = "UNKNOWN";
+	unsigned int i;
+
+	for (i = 0; i < RTE_DIM(rte_tx_offload_names); ++i) {
+		if (offload == rte_tx_offload_names[i].offload) {
+			name = rte_tx_offload_names[i].name;
+			break;
+		}
+	}
+
+	return name;
+}
+
 int
 rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
 		      const struct rte_eth_conf *dev_conf)
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 0396465..5fab553 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -981,6 +981,11 @@ struct rte_eth_conf {
  */
 #define DEV_TX_OFFLOAD_SECURITY         0x00020000
 
+/*
+ * If new Tx offload capabilities are defined, they also must be
+ * mentioned in rte_tx_offload_names in rte_ethdev.c file.
+ */
+
 struct rte_pci_device;
 
 /**
@@ -1941,6 +1946,19 @@ uint32_t rte_eth_speed_bitflag(uint32_t speed, int duplex);
 const char *rte_eth_dev_rx_offload_name(uint64_t offload);
 
 /**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Get DEV_TX_OFFLOAD_* flag name
+ *
+ * @param offload
+ *   Offload flag
+ * @return
+ *   Offload name or 'UNKNOWN' if the flag cannot be recognised
+ */
+const char *rte_eth_dev_tx_offload_name(uint64_t offload);
+
+/**
  * Configure an Ethernet device.
  * This function must be invoked first before any other function in the
  * Ethernet API. This function can also be re-invoked when a device is in the
diff --git a/lib/librte_ether/rte_ethdev_version.map b/lib/librte_ether/rte_ethdev_version.map
index 94d348f..4239e8a 100644
--- a/lib/librte_ether/rte_ethdev_version.map
+++ b/lib/librte_ether/rte_ethdev_version.map
@@ -214,5 +214,6 @@ EXPERIMENTAL {
 	rte_mtr_stats_read;
 	rte_mtr_stats_update;
 	rte_eth_dev_rx_offload_name;
+	rte_eth_dev_tx_offload_name;
 
 } DPDK_17.11;
-- 
2.7.4