[PATCH 19.11 v2 2/2] net/mlx5: fix GRE flow item matching

[Gregory Etelson <getelson@nvidia.com>]

From: Alexander Kozyrev <akozyrev@nvidia.com>

[ upstream commit 9e61533df27fc4d76080da20a7e8f9c9e7e1b90f ]

GRE protocol type is implicitly set in the matching translation in case
an application doesn't specify any type explicitly in a flow rule.
It is extracted from the inner header type, but this type may be absent.
In this case, GRE item matching is broken. Check if we have the inner
header type before setting it to allow matching on all GRE packets.

Fixes: be26e81bfc1c ("net/mlx5: fix GRE protocol type translation")
Cc: stable@dpdk.org

Signed-off-by: Alexander Kozyrev <akozyrev@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
 drivers/net/mlx5/mlx5_flow_dv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index a65a670045..2c7d5c7c02 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -5936,8 +5936,9 @@ flow_dv_translate_item_gre(void *matcher, void *key,
 	protocol_v = rte_be_to_cpu_16(gre_v->protocol);
 	if (!protocol_m) {
 		/* Force next protocol to prevent matchers duplication */
-		protocol_m = 0xFFFF;
 		protocol_v = mlx5_translate_tunnel_etypes(pattern_flags);
+		if (protocol_v)
+			protocol_m = 0xFFFF;
 	}
 	MLX5_SET(fte_match_set_misc, misc_m, gre_protocol, protocol_m);
 	MLX5_SET(fte_match_set_misc, misc_v, gre_protocol,
-- 
2.34.0