[dpdk-stable] [PATCH] net/mlx5: fix switchdev mode recognition

[Matan Azrad]

From: Slava Ovsiienko
> The new kernels might add the switch_id attribute to the Netlink replies and
> this caused the wrong recognition of the E-Switch presence. The single uplink
> device was erroneously recognized as master and it caused the extending
> match for source vport index on all installed flows, including the default ones,
> and adding extra hops in the steering engine, that affected the maximal
> throughput packet rate.
> 
> The extra check for the new device name format (it supposes the new
> kernel) and the device is only one is added. If this check succeeds the E-
> Switch presence is considered as wrongly detected and overridden.
> 
> Fixes: 30a86157f6d5 ("net/mlx5: support PF representor")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Viacheslav Ovsiienko <viacheslavo at nvidia.com>
Acked-by: Matan Azrad <matan at nvidia.com>