vdpa/mlx5: set default queue indices

The rte_vhost_get_vring_base function is being called to get the values
of last_avail_idx and last_used_idx.
These fields will not have the correct values in case the function
returns an error.

Adding a check for the function return value, and in the case of an
error, set the fields to be zero and print a warning message.

Fixes: bff735011078 ("vdpa/mlx5: prepare virtio queues")
Cc: stable@dpdk.org
Signed-off-by: Asaf Penso <asafp@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

diff --git a/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c b/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c
index 2312331..cb2d61b 100644 (file)
--- a/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c
+++ b/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c
@@ -236,10 +236,17 @@ mlx5_vdpa_virtq_setup(struct mlx5_vdpa_priv *priv,
                }
                attr.available_addr = gpa;
        }
-       rte_vhost_get_vring_base(priv->vid, index, &last_avail_idx,
+       ret = rte_vhost_get_vring_base(priv->vid, index, &last_avail_idx,
                                 &last_used_idx);
-       DRV_LOG(INFO, "vid %d: Init last_avail_idx=%d, last_used_idx=%d for "
-               "virtq %d.", priv->vid, last_avail_idx, last_used_idx, index);
+       if (ret) {
+               last_avail_idx = 0;
+               last_used_idx = 0;
+               DRV_LOG(WARNING, "Couldn't get vring base, idx are set to 0");
+       } else {
+               DRV_LOG(INFO, "vid %d: Init last_avail_idx=%d, last_used_idx=%d for "
+                               "virtq %d.", priv->vid, last_avail_idx,
+                               last_used_idx, index);
+       }
        attr.hw_available_index = last_avail_idx;
        attr.hw_used_index = last_used_idx;
        attr.q_size = vq.size;