Re: [PATCH] vdpa/mlx5: Clear vq ready indication upon device reset

[Jason Wang]

在 2021/6/3 下午3:00, Jason Wang 写道:
> 在 2021/6/2 下午4:59, Eli Cohen 写道:
> > After device reset, the virtqueues are not ready so clear the ready
> > field.
> >
> > Failing to do so can result in virtio_vdpa failing to load if the device
> > was previously used by vhost_vdpa and the old values are ready.
> > virtio_vdpa expects to find VQs in "not ready" state.
> >
> > Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 
> > devices")
> > Signed-off-by: Eli Cohen <elic@xxxxxxxxxx>
>
>
> Acked-by: Jason Wang <jasowang@xxxxxxxxxx>


A second thought.

destroy_virtqueue() could be called many places.

One of them is the mlx5_vdpa_change_map(), if this is case, this looks 
wrong.

It looks to me it's simpler to do this in clear_virtqueues() which can 
only be called during reset.

Thanks


> > ---
> >   drivers/vdpa/mlx5/net/mlx5_vnet.c | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c 
> > b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > index 02a05492204c..e8bc0842b44c 100644
> > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > @@ -862,6 +862,7 @@ static void destroy_virtqueue(struct 
> > mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtq
> >           return;
> >       }
> >       umems_destroy(ndev, mvq);
> > +    mvq->ready = false;
> >   }
> >     static u32 get_rqpn(struct mlx5_vdpa_virtqueue *mvq, bool fw)