IB/mlx4: When no DMFS for IPoIB, don't allow NET_IF QPs

According to the firmware spec, FLOW_STEERING_IB_UC_QP_RANGE command is
supported only if dmfs_ipoib bit is set.

If it isn't set we want to ensure allocating NET_IF QPs fail. We do so
by filling out the allocation bitmap. By thus, the NET_IF QPs allocating
function won't find any free QP and will fail.

Fixes: c1c98501121e ('IB/mlx4: Add support for steerable IB UD QPs')
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Daniel Jurgens <danielj@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 13 insertions, 8 deletions

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index 4054a1bfabb5..4a67ffc1ddfb 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -2823,14 +2823,19 @@ static void *mlx4_ib_add(struct mlx4_dev *dev)
                         goto err_steer_qp_release;
                 }
 
-                bitmap_zero(ibdev->ib_uc_qpns_bitmap, ibdev->steer_qpn_count);
-
-                err = mlx4_FLOW_STEERING_IB_UC_QP_RANGE(
-                                dev, ibdev->steer_qpn_base,
-                                ibdev->steer_qpn_base +
-                                ibdev->steer_qpn_count - 1);
-                if (err)
-                        goto err_steer_free_bitmap;
+                if (dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_DMFS_IPOIB) {
+                        bitmap_zero(ibdev->ib_uc_qpns_bitmap,
+                                    ibdev->steer_qpn_count);
+                        err = mlx4_FLOW_STEERING_IB_UC_QP_RANGE(
+                                        dev, ibdev->steer_qpn_base,
+                                        ibdev->steer_qpn_base +
+                                        ibdev->steer_qpn_count - 1);
+                        if (err)
+                                goto err_steer_free_bitmap;
+                } else {
+                        bitmap_fill(ibdev->ib_uc_qpns_bitmap,
+                                    ibdev->steer_qpn_count);
+                }
         }
 
         for (j = 1; j <= ibdev->dev->caps.num_ports; j++)