[PATCH] vdpa/mlx5: should keep avail_index despite device status

[Si-Wei Liu]

A VM with mlx5 vDPA has below warnings while being reset:

vhost VQ 0 ring restore failed: -1: Resource temporarily unavailable (11)
vhost VQ 1 ring restore failed: -1: Resource temporarily unavailable (11)

We should allow userspace emulating the virtio device be
able to get to vq's avail_index, regardless of vDPA device
status. Save the index that was last seen when virtq was
stopped, so that userspace doesn't complain.

Signed-off-by: Si-Wei Liu <si-wei....@oracle.com>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c 
b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 70676a6..74264e59 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1133,15 +1133,17 @@ static void suspend_vq(struct mlx5_vdpa_net *ndev, 
struct mlx5_vdpa_virtqueue *m
        if (!mvq->initialized)
                return;
 
-       if (query_virtqueue(ndev, mvq, &attr)) {
-               mlx5_vdpa_warn(&ndev->mvdev, "failed to query virtqueue\n");
-               return;
-       }
        if (mvq->fw_state != MLX5_VIRTIO_NET_Q_OBJECT_STATE_RDY)
                return;
 
        if (modify_virtqueue(ndev, mvq, MLX5_VIRTIO_NET_Q_OBJECT_STATE_SUSPEND))
                mlx5_vdpa_warn(&ndev->mvdev, "modify to suspend failed\n");
+
+       if (query_virtqueue(ndev, mvq, &attr)) {
+               mlx5_vdpa_warn(&ndev->mvdev, "failed to query virtqueue\n");
+               return;
+       }
+       mvq->avail_idx = attr.available_index;
 }
 
 static void suspend_vqs(struct mlx5_vdpa_net *ndev)
@@ -1411,8 +1413,14 @@ static int mlx5_vdpa_get_vq_state(struct vdpa_device 
*vdev, u16 idx, struct vdpa
        struct mlx5_virtq_attr attr;
        int err;
 
-       if (!mvq->initialized)
-               return -EAGAIN;
+       /* If the virtq object was destroyed, use the value saved at
+        * the last minute of suspend_vq. This caters for userspace
+        * that cares about emulating the index after vq is stopped.
+        */
+       if (!mvq->initialized) {
+               state->avail_index = mvq->avail_idx;
+               return 0;
+       }
 
        err = query_virtqueue(ndev, mvq, &attr);
        if (err) {
-- 
1.8.3.1