IB/mlx4: Set VF to read from QP counters

As IB VFs are not capable to read the port counters through MADs,
move there to read their own QP counters to gather statistics.
Signed-off-by: NEran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: NHadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/infiniband/hw/mlx4/mad.c

@@ -869,10 +869,12 @@ int mlx4_ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
 			struct ib_wc *in_wc, struct ib_grh *in_grh,
 			struct ib_mad *in_mad, struct ib_mad *out_mad)
 {
+	struct mlx4_ib_dev *dev = to_mdev(ibdev);
 	switch (rdma_port_get_link_layer(ibdev, port_num)) {
 	case IB_LINK_LAYER_INFINIBAND:
-		return ib_process_mad(ibdev, mad_flags, port_num, in_wc,
-				      in_grh, in_mad, out_mad);
+		if (!mlx4_is_slave(dev->dev))
+			return ib_process_mad(ibdev, mad_flags, port_num, in_wc,
+					      in_grh, in_mad, out_mad);
 	case IB_LINK_LAYER_ETHERNET:
 		return iboe_process_mad(ibdev, mad_flags, port_num, in_wc,
 					  in_grh, in_mad, out_mad);