IB/mlx5: Enable MAD_IFC commands for IB ports only

MAD_IFC command is supported only for physical functions (PF)
and when physical port is IB. The proposed fix enforces it.

Fixes: d603c809 ("IB/mlx5: Fix decision on using MAD_IFC")
Reported-by: NDavid Chang <dchang@suse.com>
Signed-off-by: NNoa Osherovich <noaos@mellanox.com>
Signed-off-by: NLeon Romanovsky <leon@kernel.org>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mlx5/main.c

@@ -288,7 +288,9 @@ __be16 mlx5_get_roce_udp_sport(struct mlx5_ib_dev *dev, u8 port_num,
 
 static int mlx5_use_mad_ifc(struct mlx5_ib_dev *dev)
 {
+	if (MLX5_CAP_GEN(dev->mdev, port_type) == MLX5_CAP_PORT_TYPE_IB)
 		return !MLX5_CAP_GEN(dev->mdev, ib_virt);
+	return 0;
 }
 
 enum {