On Wed, Feb 17, 2021 at 11:42:48AM -0800, Si-Wei Liu wrote:
>
>
> On 2/16/2021 8:20 AM, Eli Cohen wrote:
> > When we suspend the VM, the VDPA interface will be reset. When the VM is
> > resumed again, clear_virtqueues() will clear the available and used
> > indices resulting in hardware virqtqueue objects becoming out of sync.
> > We can avoid this function alltogether since qemu will clear them if
> > required, e.g. when the VM went through a reboot.
> >
> > Moreover, since the hw available and used indices should always be
> > identical on query and should be restored to the same value same value
> > for virtqueues that complete in order, we set the single value provided
> > by set_vq_state(). In get_vq_state() we return the value of hardware
> > used index.
> >
> > Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices")
> > Signed-off-by: Eli Cohen <elic@xxxxxxxxxx>
> Acked-by: Si-Wei Liu <si-wei.liu@xxxxxxxxxx>
Seems to also fix b35ccebe3ef76168aa2edaa35809c0232cb3578e, right?
> > ---
> > drivers/vdpa/mlx5/net/mlx5_vnet.c | 17 ++++-------------
> > 1 file changed, 4 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > index b8e9d525d66c..a51b0f86afe2 100644
> > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > @@ -1169,6 +1169,7 @@ static void suspend_vq(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *m
> > return;
> > }
> > mvq->avail_idx = attr.available_index;
> > + mvq->used_idx = attr.used_index;
> > }
> > static void suspend_vqs(struct mlx5_vdpa_net *ndev)
> > @@ -1426,6 +1427,7 @@ static int mlx5_vdpa_set_vq_state(struct vdpa_device *vdev, u16 idx,
> > return -EINVAL;
> > }
> > + mvq->used_idx = state->avail_index;
> > mvq->avail_idx = state->avail_index;
> > return 0;
> > }
> > @@ -1443,7 +1445,7 @@ static int mlx5_vdpa_get_vq_state(struct vdpa_device *vdev, u16 idx, struct vdpa
> > * that cares about emulating the index after vq is stopped.
> > */
> > if (!mvq->initialized) {
> > - state->avail_index = mvq->avail_idx;
> > + state->avail_index = mvq->used_idx;
> > return 0;
> > }
> > @@ -1452,7 +1454,7 @@ static int mlx5_vdpa_get_vq_state(struct vdpa_device *vdev, u16 idx, struct vdpa
> > mlx5_vdpa_warn(mvdev, "failed to query virtqueue\n");
> > return err;
> > }
> > - state->avail_index = attr.available_index;
> > + state->avail_index = attr.used_index;
> > return 0;
> > }
> > @@ -1532,16 +1534,6 @@ static void teardown_virtqueues(struct mlx5_vdpa_net *ndev)
> > }
> > }
> > -static void clear_virtqueues(struct mlx5_vdpa_net *ndev)
> > -{
> > - int i;
> > -
> > - for (i = ndev->mvdev.max_vqs - 1; i >= 0; i--) {
> > - ndev->vqs[i].avail_idx = 0;
> > - ndev->vqs[i].used_idx = 0;
> > - }
> > -}
> > -
> > /* TODO: cross-endian support */
> > static inline bool mlx5_vdpa_is_little_endian(struct mlx5_vdpa_dev *mvdev)
> > {
> > @@ -1777,7 +1769,6 @@ static void mlx5_vdpa_set_status(struct vdpa_device *vdev, u8 status)
> > if (!status) {
> > mlx5_vdpa_info(mvdev, "performing device reset\n");
> > teardown_driver(ndev);
> > - clear_virtqueues(ndev);
> > mlx5_vdpa_destroy_mr(&ndev->mvdev);
> > ndev->mvdev.status = 0;
> > ++mvdev->generation;
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