[dpdk-stable] [PATCH v1] net/mlx5: fix IPIP multi tunnel validation

[Matan Azrad]

From: Lior Margalit
> A flow rule must not include multiple tunnel layers.
> An attempt to create such a rule, for example:
> testpmd> flow create .../ vxlan / eth / ipv4 proto is 4 / end <actions>
> results in an unclear error.
> 
> In the current implementation there is a check for multiple IPIP tunnels, but
> not for combination of IPIP and a different kind of tunnel, such as VXLAN.
> The fix is to enhance the above check to use MLX5_FLOW_LAYER_TUNNEL
> that consists of all the tunnel masks. The error message will be "multiple
> tunnel not supported".
> 
> Fixes: 5e33bebdd8d3 ("net/mlx5: support IP-in-IP tunnel")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Lior Margalit <lmargalit at nvidia.com>
> Acked-by: Ori Kam <orika at nvidia.com>
Acked-by: Matan Azrad <matan at nvidia.com>