[dpdk-dev] [PATCH] net/mlx5: fix un-supported RSS hash fields use

[Nelio Laranjeiro <nelio.laranjeiro@6wind.com>]

MLX5 NIC does not support all hash fields, this patch limit by refusing
impossible RSS combination to avoid errors.

Fixes: 2f97422e7759 ("mlx5: support RSS hash update and get")
Cc: stable@dpdk.org

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Acked-by: Yongseok Koh <yskoh@mellanox.com>
---
 drivers/net/mlx5/mlx5_defs.h |  5 +++++
 drivers/net/mlx5/mlx5_flow.c | 11 +++++++++--
 drivers/net/mlx5/mlx5_rss.c  |  5 +++++
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_defs.h b/drivers/net/mlx5/mlx5_defs.h
index 3a7706cfd..64bb0712e 100644
--- a/drivers/net/mlx5/mlx5_defs.h
+++ b/drivers/net/mlx5/mlx5_defs.h
@@ -34,6 +34,8 @@
 #ifndef RTE_PMD_MLX5_DEFS_H_
 #define RTE_PMD_MLX5_DEFS_H_
 
+#include <rte_ethdev.h>
+
 #include "mlx5_autoconf.h"
 
 /* Reported driver name. */
@@ -105,4 +107,7 @@
 /* Number of packets vectorized Rx can simultaneously process in a loop. */
 #define MLX5_VPMD_DESCS_PER_LOOP      4
 
+/* Supported RSS */
+#define MLX5_RSS_HF_MASK (~(ETH_RSS_IP | ETH_RSS_UDP | ETH_RSS_TCP))
+
 #endif /* RTE_PMD_MLX5_DEFS_H_ */
diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 6605cfd9f..e0775172c 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -50,6 +50,7 @@
 #include <rte_malloc.h>
 
 #include "mlx5.h"
+#include "mlx5_defs.h"
 #include "mlx5_prm.h"
 
 /* Define minimal priority for control plane flows. */
@@ -568,9 +569,15 @@ priv_flow_convert_rss_conf(struct priv *priv,
 			   struct mlx5_flow_parse *parser,
 			   const struct rte_eth_rss_conf *rss_conf)
 {
-	const struct rte_eth_rss_conf *rss =
-		rss_conf ? rss_conf : &priv->rss_conf;
+	const struct rte_eth_rss_conf *rss;
 
+	if (rss_conf) {
+		if (rss_conf->rss_hf & MLX5_RSS_HF_MASK)
+			return EINVAL;
+		rss = rss_conf;
+	} else {
+		rss = &priv->rss_conf;
+	}
 	if (rss->rss_key_len > 40)
 		return EINVAL;
 	parser->rss_conf.rss_key_len = rss->rss_key_len;
diff --git a/drivers/net/mlx5/mlx5_rss.c b/drivers/net/mlx5/mlx5_rss.c
index f4911359b..f47bda667 100644
--- a/drivers/net/mlx5/mlx5_rss.c
+++ b/drivers/net/mlx5/mlx5_rss.c
@@ -51,6 +51,7 @@
 #include <rte_ethdev.h>
 
 #include "mlx5.h"
+#include "mlx5_defs.h"
 #include "mlx5_rxtx.h"
 
 /**
@@ -72,6 +73,10 @@ mlx5_rss_hash_update(struct rte_eth_dev *dev,
 	int ret = 0;
 
 	priv_lock(priv);
+	if (rss_conf->rss_hf & MLX5_RSS_HF_MASK) {
+		ret = -EINVAL;
+		goto out;
+	}
 	if (rss_conf->rss_key && rss_conf->rss_key_len) {
 		priv->rss_conf.rss_key = rte_realloc(priv->rss_conf.rss_key,
 						     rss_conf->rss_key_len, 0);
-- 
2.11.0