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: d603c809ef91 ("IB/mlx5: Fix decision on using MAD_IFC")
Reported-by: David Chang <dchang@suse.com>
Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index 8150ea3..0480b64 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -288,7 +288,9 @@
 
 static int mlx5_use_mad_ifc(struct mlx5_ib_dev *dev)
 {
-	return !MLX5_CAP_GEN(dev->mdev, ib_virt);
+	if (MLX5_CAP_GEN(dev->mdev, port_type) == MLX5_CAP_PORT_TYPE_IB)
+		return !MLX5_CAP_GEN(dev->mdev, ib_virt);
+	return 0;
 }
 
 enum {