[dpdk-stable] [PATCH] net/mlx5: fix register c0 usage for metadata entities

[Matan Azrad]

From: Viacheslav Ovsiienko
> The register c0 might be engaged to support META and MARK related items
> and actions. Also, this register might be used by kernel to specify the source
> vport index. The register c0 is split into two 16-bit fields. Depending on the
> mask returned by kernel the PMD can use upper or lower half of register c0.
> This patch adds the missing support for upper half.
> 
> Fixes: e554b672aa05 ("net/mlx5: support flow tag")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Viacheslav Ovsiienko <viacheslavo at mellanox.com>
Acked-by: Matan Azrad <matan at mellanox.com>