net/mlx5: Enable SW-defined RoCEv2 UDP source port

When this is enabled, UDP source port for RoCEv2 packets are defined
by software instead of firmware.

Signed-off-by: Mark Zhang <markz@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>

include/linux/mlx5/mlx5_ifc.h

@@ -74,6 +74,7 @@ enum {
 	MLX5_SET_HCA_CAP_OP_MOD_GENERAL_DEVICE        = 0x0,
 	MLX5_SET_HCA_CAP_OP_MOD_ODP                   = 0x2,
 	MLX5_SET_HCA_CAP_OP_MOD_ATOMIC                = 0x3,
+	MLX5_SET_HCA_CAP_OP_MOD_ROCE                  = 0x4,
 };
 
 enum {
@@ -903,7 +904,9 @@ struct mlx5_ifc_per_protocol_networking_offload_caps_bits {
 
 struct mlx5_ifc_roce_cap_bits {
 	u8         roce_apm[0x1];
-	u8         reserved_at_1[0x1f];
+	u8         reserved_at_1[0x3];
+	u8         sw_r_roce_src_udp_port[0x1];
+	u8         reserved_at_5[0x1b];
 
 	u8         reserved_at_20[0x60];