On Mon, Feb 20, 2023 at 3:04 PM Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> wrote:
>
> On Mon, 20 Feb 2023 13:38:30 +0800, Jason Wang <jasowang@xxxxxxxxxx> wrote:
> > On Tue, Feb 14, 2023 at 3:27 PM Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> wrote:
> > >
> > > Introduce virtqueue_reset() to release all buffer inside vq.
> > >
> > > Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
> > > ---
> > > drivers/virtio/virtio_ring.c | 50 ++++++++++++++++++++++++++++++++++++
> > > include/linux/virtio.h | 2 ++
> > > 2 files changed, 52 insertions(+)
> > >
> > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> > > index 2ba60a14f557..2750a365439a 100644
> > > --- a/drivers/virtio/virtio_ring.c
> > > +++ b/drivers/virtio/virtio_ring.c
> > > @@ -2930,6 +2930,56 @@ int virtqueue_resize(struct virtqueue *_vq, u32 num,
> > > }
> > > EXPORT_SYMBOL_GPL(virtqueue_resize);
> > >
> > > +/**
> > > + * virtqueue_reset - detach and recycle all unused buffers
> > > + * @_vq: the struct virtqueue we're talking about.
> > > + * @recycle: callback to recycle unused buffers
> > > + *
> > > + * Caller must ensure we don't call this with other virtqueue operations
> > > + * at the same time (except where noted).
> > > + *
> > > + * Returns zero or a negative error.
> > > + * 0: success.
> > > + * -EBUSY: Failed to sync with device, vq may not work properly
> > > + * -ENOENT: Transport or device not supported
> > > + * -EPERM: Operation not permitted
> > > + */
> > > +int virtqueue_reset(struct virtqueue *_vq,
> > > + void (*recycle)(struct virtqueue *vq, void *buf))
> > > +{
> > > + struct vring_virtqueue *vq = to_vvq(_vq);
> > > + struct virtio_device *vdev = vq->vq.vdev;
> > > + void *buf;
> > > + int err;
> > > +
> > > + if (!vq->we_own_ring)
> > > + return -EPERM;
> > > +
> > > + if (!vdev->config->disable_vq_and_reset)
> > > + return -ENOENT;
> > > +
> > > + if (!vdev->config->enable_vq_after_reset)
> > > + return -ENOENT;
> > > +
> > > + err = vdev->config->disable_vq_and_reset(_vq);
> > > + if (err)
> > > + return err;
> > > +
> > > + while ((buf = virtqueue_detach_unused_buf(_vq)) != NULL)
> > > + recycle(_vq, buf);
> > > +
> > > + if (vq->packed_ring)
> > > + virtqueue_reinit_packed(vq);
> > > + else
> > > + virtqueue_reinit_split(vq);
> > > +
> > > + if (vdev->config->enable_vq_after_reset(_vq))
> > > + return -EBUSY;
> > > +
> > > + return 0;
> > > +}
> >
> > I don't get why not factor the similar logic from virtqueue_resize()?
>
>
> I can do this, if you prefer this.
>
> THanks.
Please do that, reset is a step of resize if I understand correctly.
Thanks
>
>
>
> >
> > Thanks
> >
> >
> > > +EXPORT_SYMBOL_GPL(virtqueue_reset);
> > > +
> > > /* Only available for split ring */
> > > struct virtqueue *vring_new_virtqueue(unsigned int index,
> > > unsigned int num,
> > > diff --git a/include/linux/virtio.h b/include/linux/virtio.h
> > > index d0e707d744a0..cf4c157e4e75 100644
> > > --- a/include/linux/virtio.h
> > > +++ b/include/linux/virtio.h
> > > @@ -106,6 +106,8 @@ dma_addr_t virtqueue_get_used_addr(struct virtqueue *vq);
> > >
> > > int virtqueue_resize(struct virtqueue *vq, u32 num,
> > > void (*recycle)(struct virtqueue *vq, void *buf));
> > > +int virtqueue_reset(struct virtqueue *vq,
> > > + void (*recycle)(struct virtqueue *vq, void *buf));
> > >
> > > /**
> > > * struct virtio_device - representation of a device using virtio
> > > --
> > > 2.32.0.3.g01195cf9f
> > >
> >
>
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