[dpdk-dev] [PATCH v2] net/mlx5: fix flow creation on port start

[Shahaf Shuler <shahafs@mellanox.com>]

While the PMD avoids from creating hash RXQ with no hash fields and
array of queues after the port was allready started, it lacks such
protection when re-creating the flows after the port restarts.

This may lead to inconsist behaviour for flows depending if they were
created before or after the port start.

Fixes: 8086cf08b2f0 ("net/mlx5: handle RSS hash configuration in RSS flow")
Cc: nelio.laranjeiro@6wind.com

Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
---
On v2:
 - Fixing the issue from the hrxq_get and hrxq_new functions.
---
 drivers/net/mlx5/mlx5_flow.c | 4 ++--
 drivers/net/mlx5/mlx5_rxq.c  | 8 ++++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 5f49bf5ff..bcb06f84a 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -1781,7 +1781,7 @@ priv_flow_create_action_queue_rss(struct priv *priv,
 					   parser->rss_conf.rss_key_len,
 					   hash_fields,
 					   parser->queues,
-					   hash_fields ? parser->queues_n : 1);
+					   parser->queues_n);
 		if (flow->frxq[i].hrxq)
 			continue;
 		flow->frxq[i].hrxq =
@@ -1790,7 +1790,7 @@ priv_flow_create_action_queue_rss(struct priv *priv,
 					   parser->rss_conf.rss_key_len,
 					   hash_fields,
 					   parser->queues,
-					   hash_fields ? parser->queues_n : 1);
+					   parser->queues_n);
 		if (!flow->frxq[i].hrxq) {
 			rte_flow_error_set(error, ENOMEM,
 					   RTE_FLOW_ERROR_TYPE_HANDLE,
diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index a1f382b1f..18c13b3c7 100644
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -1265,7 +1265,8 @@ mlx5_priv_ind_table_ibv_verify(struct priv *priv)
  * @param hash_fields
  *   Verbs protocol hash field to make the RSS on.
  * @param queues
- *   Queues entering in hash queue.
+ *   Queues entering in hash queue. In case of empty hash_fields only the
+ *   first queue index will be taken for the indirection table.
  * @param queues_n
  *   Number of queues.
  *
@@ -1280,6 +1281,7 @@ mlx5_priv_hrxq_new(struct priv *priv, uint8_t *rss_key, uint8_t rss_key_len,
 	struct mlx5_ind_table_ibv *ind_tbl;
 	struct ibv_qp *qp;
 
+	queues_n = hash_fields ? queues_n : 1;
 	ind_tbl = mlx5_priv_ind_table_ibv_get(priv, queues, queues_n);
 	if (!ind_tbl)
 		ind_tbl = mlx5_priv_ind_table_ibv_new(priv, queues, queues_n);
@@ -1332,7 +1334,8 @@ mlx5_priv_hrxq_new(struct priv *priv, uint8_t *rss_key, uint8_t rss_key_len,
  * @param rss_conf
  *   RSS configuration for the Rx hash queue.
  * @param queues
- *   Queues entering in hash queue.
+ *   Queues entering in hash queue. In case of empty hash_fields only the
+ *   first queue index will be taken for the indirection table.
  * @param queues_n
  *   Number of queues.
  *
@@ -1345,6 +1348,7 @@ mlx5_priv_hrxq_get(struct priv *priv, uint8_t *rss_key, uint8_t rss_key_len,
 {
 	struct mlx5_hrxq *hrxq;
 
+	queues_n = hash_fields ? queues_n : 1;
 	LIST_FOREACH(hrxq, &priv->hrxqs, next) {
 		struct mlx5_ind_table_ibv *ind_tbl;
 
-- 
2.12.0