[PATCH] net/mlx5: fix failed to match on empty gre on root table

[Raslan Darawsheh]

From: Maayan Kashani <mkashani at nvidia.com>
Sent: Wednesday, March 12, 2025 1:23 PM
To: dev at dpdk.org
Cc: Maayan Kashani; Dariusz Sosnowski; Raslan Darawsheh; stable at dpdk.org; Bing Zhao; Slava Ovsiienko; Ori Kam; Suanming Mou; Matan Azrad; Gregory Etelson
Subject: [PATCH] net/mlx5: fix failed to match on empty gre on root table

The currnent implementation sets a gre mask with protocol masked in
case the user did not supply the protocol mask.
In template mode, for group 0, the gre translation was called
once with the mask and later with the value.
with gre open matcher(mask/value is null) default values were assigned
gre protocol mask=0xffff and gre protocol value=0.

Therefore gre packet with protocol value not equal zero,
will not match the rule.
Changed the default protocol mask to be zero instead of 0xffff.

In case of empty gre match,
this fix will ignore the protocol field matching,
gre will only be matched by the IP next header field in
previous header in packet.

Fixes: 25ab2cbba31d ("net/mlx5: fix GRE flow item translation for root table")
Cc: stable at dpdk.org

Signed-off-by: Maayan Kashani <mkashani at nvidia.com>
Acked-by: Bing Zhao <bingz at nvidia.com>

Patch applied to next-net-mlx,

Kindest regards,
Raslan Darawsheh