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virtio_ring: introduce virtqueue_reset()

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Introduce virtqueue_reset() to release all buffer inside vq.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20230810123057.43407-10-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xuan Zhuo 2023-08-10 20:30:54 +08:00 committed by Michael S. Tsirkin
parent ad48d53b5b
commit ba3e0c47c0
2 changed files with 35 additions and 0 deletions
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33
drivers/virtio/virtio_ring.c
View File

@ -2812,6 +2812,39 @@ int virtqueue_set_dma_premapped(struct virtqueue *_vq)
}
EXPORT_SYMBOL_GPL(virtqueue_set_dma_premapped);
/**
* 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);
int err;
err = virtqueue_disable_and_recycle(_vq, recycle);
if (err)
return err;
if (vq->packed_ring)
virtqueue_reinit_packed(vq);
else
virtqueue_reinit_split(vq);
return virtqueue_enable_after_reset(_vq);
}
EXPORT_SYMBOL_GPL(virtqueue_reset);
/* Only available for split ring */
struct virtqueue *vring_new_virtqueue(unsigned int index,
unsigned int num,

2
include/linux/virtio.h
View File

@ -99,6 +99,8 @@ dma_addr_t virtqueue_get_used_addr(const 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