[dpdk-stable] [PATCH] net/mlx5: fix match MPLS over GRE with key

[Matan Azrad]

From: Jack Min
> Currently PMD needs previous layer information in order to set
> corresponding match field for MPLSoGRE or MPLSoUDP.
> 
> GRE_KEY item is missing as supported previous layer when translate item
> MPLS, which causes flow[1] cannot match MPLS over GRE traffic.
> 
> According to RFC4023, MPLS over GRE tunnel with optional key field needs to
> be supported too.
> 
> By adding missing GRE_KEY as supported previous layer fix problem.
> 
> [1]:
> flow create 0 ingress pattern eth / ipv6 / gre k_bit is 1 / gre_key / mpls label is
> 966138 / end actions queue index 1 / mark id 0xa / end
> 
> Fixes: a7a0365565a4 ("net/mlx5: match GRE key and present bits")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Xiaoyu Min <jackmin at nvidia.com>
Acked-by: Matan Azrad <matan at nvidia.com>