[dpdk-dev] [PATCH v2] net/mlx5: fix VLAN item match for DV mode

[Matan Azrad]

From: Dekel Peled
> Currently MLX5 PMD can't match on untagged packets specifically.
> Tagged traffic still hits the flows intended for untagged packets.
> If the flow has ETH, it will catch all matching packets, tagged and untagged.
> The solution is to use cvlan_tag bit.
> If mask=1 and value=0 it matches on untagged traffic.
> If mask=1 and value=1 it matches on tagged traffic.
> This is the kernel implementation.
> 
> This patch updated MLX5 PMD to set cvlan_tag mask and value according to
> flow rule contents.
> This update is relevant when using DV flow engine (dv_flow_en=1).
> 
> See example at
> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoc.d
> pdk.org%2Fguides%2Fnics%2Fmlx5.html%23limitations&data=02%7C01
> %7Cmatan%40mellanox.com%7C4fdccf29506c4fd32ce708d7aee24ebe%7Ca6
> 52971c7d2e4d9ba6a4d149256f461b%7C0%7C0%7C637170159317867655&amp
> ;sdata=PVklEAti0Im%2FAXWuzDlizjxkVAyjCZSwF3vcYQ1x7fw%3D&reser
> ved=0.
> 
> Fixes: fc2c498ccb94 ("net/mlx5: add Direct Verbs translate items")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Dekel Peled <dekelp at mellanox.com>
Acked-by: Matan Azrad <matan at mellanox.com>