net/mlx5: TX WQE Add trailer insertion field

Add new TX WQE field for Connect-X6DX trailer insertion support,
when set, the HW adds a trailer to the packet, the WQE trailer
association flags are used to set to HW the header which the
trailer belongs.
Signed-off-by: Raed Salem <raeds@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

include/linux/mlx5/qp.h

@@ -229,6 +229,11 @@ enum {
 
 enum {
 	MLX5_ETH_WQE_SVLAN              = 1 << 0,
+	MLX5_ETH_WQE_TRAILER_HDR_OUTER_IP_ASSOC = 1 << 26,
+	MLX5_ETH_WQE_TRAILER_HDR_OUTER_L4_ASSOC = 1 << 27,
+	MLX5_ETH_WQE_TRAILER_HDR_INNER_IP_ASSOC = 3 << 26,
+	MLX5_ETH_WQE_TRAILER_HDR_INNER_L4_ASSOC = 1 << 28,
+	MLX5_ETH_WQE_INSERT_TRAILER     = 1 << 30,
 	MLX5_ETH_WQE_INSERT_VLAN        = 1 << 15,
 };
 
@@ -257,6 +262,7 @@ struct mlx5_wqe_eth_seg {
 			__be16 type;
 			__be16 vlan_tci;
 		} insert;
+		__be32 trailer;
 	};
 };