[dpdk-stable] [PATCH] net/mlx5: fix multiple flow table hash list

[Xiaoyu Min <jackmin@mellanox.com>]

The eth devices which share one ibv device only need one hash list of
flow table.

Currently, flow table hash list is created per each eth device
whatever whether they share one ibv device or not.

If the devices share one ibv device, the previously created hash list
will become dangle because the pointer point to (sh->flow_tbls) is
overwritten by the later created hast list.

To fix this, just don't create hash list if it is already created.

Fixes: 54534725d2f3 ("net/mlx5: fix flow table hash list conversion")
Cc: stable@dpdk.org

Reported-by: Zhike Wang <wangzhike@jd.com>
Signed-off-by: Xiaoyu Min <jackmin@mellanox.com>
---
 drivers/net/mlx5/mlx5.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index d84a6f91b4..50960c91ce 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -868,8 +868,13 @@ mlx5_alloc_shared_dr(struct mlx5_priv *priv)
 {
 	struct mlx5_ibv_shared *sh = priv->sh;
 	char s[MLX5_HLIST_NAMESIZE];
-	int err = mlx5_alloc_table_hash_list(priv);
+	int err = 0;
 
+	if (!sh->flow_tbls)
+		err = mlx5_alloc_table_hash_list(priv);
+	else
+		DRV_LOG(DEBUG, "sh->flow_tbls[%p] already created, reuse\n",
+			(void *)sh->flow_tbls);
 	if (err)
 		return err;
 	/* Create tags hash list table. */
-- 
2.24.0