[PATCH 7/9] lib/ethdev: add API to get RSS algorithm names

[Jie Hai <haijie1@huawei.com>]

This patch adds new API rte_eth_dev_rss_algo_name() to get
name of a RSS algorithm and document it.

Signed-off-by: Jie Hai <haijie1@huawei.com>
---
 doc/guides/rel_notes/release_23_11.rst |  3 +++
 lib/ethdev/rte_ethdev.c                | 25 +++++++++++++++++++++++++
 lib/ethdev/rte_ethdev.h                |  4 ++++
 3 files changed, 32 insertions(+)

diff --git a/doc/guides/rel_notes/release_23_11.rst b/doc/guides/rel_notes/release_23_11.rst
index a35d729d2cc7..fe561a6c59b9 100644
--- a/doc/guides/rel_notes/release_23_11.rst
+++ b/doc/guides/rel_notes/release_23_11.rst
@@ -243,6 +243,9 @@ New Features
   Added dispatcher library which purpose is to help decouple different
   parts (modules) of an eventdev-based application.
 
+* **Added new API for RSS hash algorithm**
+  Added new function ``rte_eth_dev_rss_algo_name`` to get name of RSS hash
+  algorithm.
 
 Removed Items
 -------------
diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
index 7af163b8a4b3..503e1a4cd13d 100644
--- a/lib/ethdev/rte_ethdev.c
+++ b/lib/ethdev/rte_ethdev.c
@@ -160,6 +160,17 @@ enum {
 	STAT_QMAP_RX
 };
 
+static const struct {
+	enum rte_eth_hash_function algo;
+	const char *name;
+} rte_eth_dev_rss_algo_names[] = {
+	{RTE_ETH_HASH_FUNCTION_DEFAULT, "default"},
+	{RTE_ETH_HASH_FUNCTION_SIMPLE_XOR, "simple_xor"},
+	{RTE_ETH_HASH_FUNCTION_TOEPLITZ, "toeplitz"},
+	{RTE_ETH_HASH_FUNCTION_SYMMETRIC_TOEPLITZ, "symmetric_toeplitz"},
+	{RTE_ETH_HASH_FUNCTION_SYMMETRIC_TOEPLITZ_SORT, "symmetric_toeplitz_sort"},
+};
+
 int
 rte_eth_iterator_init(struct rte_dev_iterator *iter, const char *devargs_str)
 {
@@ -4761,6 +4772,20 @@ rte_eth_dev_rss_hash_conf_get(uint16_t port_id,
 	return ret;
 }
 
+const char *
+rte_eth_dev_rss_algo_name(enum rte_eth_hash_function rss_algo)
+{
+	const char *name = "Unknown function";
+	unsigned int i;
+
+	for (i = 0; i < RTE_DIM(rte_eth_dev_rss_algo_names); i++) {
+		if (rss_algo == rte_eth_dev_rss_algo_names[i].algo)
+			return rte_eth_dev_rss_algo_names[i].name;
+	}
+
+	return name;
+}
+
 int
 rte_eth_dev_udp_tunnel_port_add(uint16_t port_id,
 				struct rte_eth_udp_tunnel *udp_tunnel)
diff --git a/lib/ethdev/rte_ethdev.h b/lib/ethdev/rte_ethdev.h
index 2f639edd8218..b9d4bfa851b4 100644
--- a/lib/ethdev/rte_ethdev.h
+++ b/lib/ethdev/rte_ethdev.h
@@ -4645,6 +4645,10 @@ int
 rte_eth_dev_rss_hash_conf_get(uint16_t port_id,
 			      struct rte_eth_rss_conf *rss_conf);
 
+
+const char *
+rte_eth_dev_rss_algo_name(enum rte_eth_hash_function rss_algo);
+
 /**
  * Add UDP tunneling port for a type of tunnel.
  *
-- 
2.30.0