RE: [PATCH v2] net/mlx5: avoid wildcard drop flow in priority discovery

> -----Original Message-----
> From: Gavin Hu <[email protected]>
> Sent: Tuesday, July 14, 2026 2:08 PM
> To: [email protected]
> Cc: Wei Yan <[email protected]>; [email protected]; Dariusz
> Sosnowski <[email protected]>; Slava Ovsiienko
> <[email protected]>; Bing Zhao <[email protected]>; Ori Kam
> <[email protected]>; Suanming Mou <[email protected]>; Matan
> Azrad <[email protected]>; Ophir Munk <[email protected]>; Dmitry
> Kozlyuk <[email protected]>
> Subject: [PATCH v2] net/mlx5: avoid wildcard drop flow in priority discovery
> 
> From: Wei Yan <[email protected]>
> 
> Priority discovery installs temporary drop flows to probe supported flow
> priorities. These flows match a wildcard Ethernet pattern, so they can also
> match real traffic while discovery is running. On shared devices this may
> temporarily drop kernel traffic and cause TCP connection timeouts.
> 
> Constrain the probe flows to match both source and destination MAC
> addresses as ff:ff:ff:ff:ff:ff. This keeps the rule valid for discovery while
> avoiding matches on normal Ethernet traffic.
> 
> Fixes: 3eca5f8a610e ("net/mlx5: move flow priority discovery to Verbs file")
> Fixes: c5042f93a425 ("net/mlx5: discover max flow priority using DevX")
> Cc: [email protected]
> 
> Signed-off-by: Wei Yan <[email protected]>
> Signed-off-by: Gavin Hu <[email protected]>
Acked-by: Suanming Mou <[email protected]>

Thanks