[PATCH 1/2] ethdev: add new API to get RSS hash algorithm by name

[Jie Hai]

This patch supports conversion from names to hash algorithms(see
RTE_ETH_HASH_FUNCTION_XXX).

Signed-off-by: Jie Hai <haijie1 at huawei.com>
Reviewed-by: Huisong Li <lihuisong at huawei.com>
---
 doc/guides/rel_notes/release_23_11.rst |  3 +++
 lib/ethdev/rte_ethdev.c                | 15 +++++++++++++++
 lib/ethdev/rte_ethdev.h                | 20 ++++++++++++++++++++
 lib/ethdev/version.map                 |  1 +
 4 files changed, 39 insertions(+)

diff --git a/doc/guides/rel_notes/release_23_11.rst b/doc/guides/rel_notes/release_23_11.rst
index 520321c71e9c..b157fb9d307e 100644
--- a/doc/guides/rel_notes/release_23_11.rst
+++ b/doc/guides/rel_notes/release_23_11.rst
@@ -124,6 +124,9 @@ New Features
   * Added new function ``rte_eth_dev_rss_algo_name``
     to get name of RSS hash algorithm.
 
+  * Added new function ``rte_eth_find_rss_algo``
+    to get RSS hash algorithm by its name.
+
 * **Added packet type flow matching criteria.**
 
   Added ``RTE_FLOW_ITEM_TYPE_PTYPE`` to allow matching on L2/L3/L4
diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
index 3858983fcc80..c0398d945502 100644
--- a/lib/ethdev/rte_ethdev.c
+++ b/lib/ethdev/rte_ethdev.c
@@ -4826,6 +4826,21 @@ rte_eth_dev_rss_algo_name(enum rte_eth_hash_function rss_algo)
 	return name;
 }
 
+int
+rte_eth_find_rss_algo(const char *name, uint32_t *algo)
+{
+	unsigned int i;
+
+	for (i = 0; i < RTE_DIM(rte_eth_dev_rss_algo_names); i++) {
+		if (strcmp(name, rte_eth_dev_rss_algo_names[i].name) == 0) {
+			*algo = rte_eth_dev_rss_algo_names[i].algo;
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
 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 77331ce6525e..3bde5c4c17a6 100644
--- a/lib/ethdev/rte_ethdev.h
+++ b/lib/ethdev/rte_ethdev.h
@@ -4667,6 +4667,26 @@ __rte_experimental
 const char *
 rte_eth_dev_rss_algo_name(enum rte_eth_hash_function rss_algo);
 
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change, or be removed, without prior notice.
+ *
+ *  Get RSS hash algorithm by its name.
+ *
+ * @param name
+ *   RSS hash algorithm.
+ *
+ * @param algo
+ *   return the RSS hash algorithm found, @see rte_eth_hash_function.
+ *
+ * @return
+ *   - (0) if successful.
+ *   - (-EINVAL) if not found.
+ */
+__rte_experimental
+int
+rte_eth_find_rss_algo(const char *name, uint32_t *algo);
+
 /**
  * Add UDP tunneling port for a type of tunnel.
  *
diff --git a/lib/ethdev/version.map b/lib/ethdev/version.map
index 5c4917c020dc..d585c12c0110 100644
--- a/lib/ethdev/version.map
+++ b/lib/ethdev/version.map
@@ -313,6 +313,7 @@ EXPERIMENTAL {
 
 	# added in 23.11
 	rte_eth_dev_rss_algo_name;
+	rte_eth_find_rss_algo;
 	rte_eth_recycle_rx_queue_info_get;
 	rte_flow_group_set_miss_actions;
 	rte_flow_calc_table_hash;
-- 
2.30.0