[PATCH v2] common/mlx5: fix mac deletion on Linux

[Dariusz Sosnowski]

On Fri, Mar 20, 2026 at 03:14:17PM +0100, David Marchand wrote:
> Re-enable debug logs unconditionally, this helps understanding why mac
> deletions were silently failing (while a bridge fdb del command was
> working fine).
> 
> testpmd> mac_addr add 0 FA:35:44:3F:58:31
> testpmd> mac_addr remove 0 FA:35:44:3F:58:31
> mlx5_common: Interface 35 cannot remove MAC address FA:35:44:3F:58:31
> 	Operation not supported
> 
> Then, fix mac deletion as the NLM_F_CREATE == 0x200 flag is relevant
> with a RTM_NEWNEIGH op.
> 
> Since kernel v5.19 though, for a RTM_DELNEIGH op, 0x200 == NLM_F_BULK
> and passing this flag makes the deletion fail miserably for a single mac.
> 
> Fixes: ccdcba53a3f4 ("net/mlx5: use Netlink to add/remove MAC addresses")
> Cc: stable at dpdk.org
> 
> Signed-off-by: David Marchand <david.marchand at redhat.com>

Acked-by: Dariusz Sosnowski <dsosnowski at nvidia.com>

Best regards,
Dariusz Sosnowski