+ Eli.
On Thu, Oct 1, 2020 at 2:02 PM Si-Wei Liu <si-wei....@oracle.com> wrote: > > 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 >