IB/mlx5: Expose MPLS related tunneling offloads

This patch reports the device's capbilities to offload
encapsulated MPLS tunnel protocols to user-space:
- Capability to offload MPLS over GRE.
- Capability to offload MPLS over UDP.
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Ariel Levkovich <lariel@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/mlx5/main.c

@@ -1084,6 +1084,14 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 		if (MLX5_CAP_ETH(mdev, tunnel_stateless_gre))
 			resp.tunnel_offloads_caps |=
 				MLX5_IB_TUNNELED_OFFLOADS_GRE;
+		if (MLX5_CAP_GEN(mdev, flex_parser_protocols) &
+		    MLX5_FLEX_PROTO_CW_MPLS_GRE)
+			resp.tunnel_offloads_caps |=
+				MLX5_IB_TUNNELED_OFFLOADS_MPLS_GRE;
+		if (MLX5_CAP_GEN(mdev, flex_parser_protocols) &
+		    MLX5_FLEX_PROTO_CW_MPLS_UDP)
+			resp.tunnel_offloads_caps |=
+				MLX5_IB_TUNNELED_OFFLOADS_MPLS_UDP;
 	}
 
 	if (uhw->outlen) {

include/linux/mlx5/device.h

@@ -1001,6 +1001,11 @@ enum mlx5_mpls_supported_fields {
 	MLX5_FIELD_SUPPORT_MPLS_TTL   = 1 << 3
 };
 
+enum mlx5_flex_parser_protos {
+	MLX5_FLEX_PROTO_CW_MPLS_GRE   = 1 << 4,
+	MLX5_FLEX_PROTO_CW_MPLS_UDP   = 1 << 5,
+};
+
 /* MLX5 DEV CAPs */
 
 /* TODO: EAT.ME */

include/linux/mlx5/mlx5_ifc.h

@@ -1138,7 +1138,9 @@ struct mlx5_ifc_cmd_hca_cap_bits {
 
 	u8         reserved_at_500[0x20];
 	u8	   num_of_uars_per_page[0x20];
-	u8         reserved_at_540[0x40];
+
+	u8         flex_parser_protocols[0x20];
+	u8         reserved_at_560[0x20];
 
 	u8         reserved_at_580[0x3d];
 	u8         cqe_128_always[0x1];

include/uapi/rdma/mlx5-abi.h

@@ -233,7 +233,9 @@ enum mlx5_ib_query_dev_resp_flags {
 enum mlx5_ib_tunnel_offloads {
 	MLX5_IB_TUNNELED_OFFLOADS_VXLAN  = 1 << 0,
 	MLX5_IB_TUNNELED_OFFLOADS_GRE    = 1 << 1,
-	MLX5_IB_TUNNELED_OFFLOADS_GENEVE = 1 << 2
+	MLX5_IB_TUNNELED_OFFLOADS_GENEVE = 1 << 2,
+	MLX5_IB_TUNNELED_OFFLOADS_MPLS_GRE = 1 << 3,
+	MLX5_IB_TUNNELED_OFFLOADS_MPLS_UDP = 1 << 4,
 };
 
 struct mlx5_ib_query_device_resp {