Commit ba3e0c47 authored by Xuan Zhuo's avatar Xuan Zhuo Committed by Michael S. Tsirkin
Browse files

virtio_ring: introduce virtqueue_reset() 



Introduce virtqueue_reset() to release all buffer inside vq.

Signed-off-by: default avatarXuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: default avatarJason Wang <jasowang@redhat.com>
Message-Id: <20230810123057.43407-10-xuanzhuo@linux.alibaba.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent ad48d53b

drivers/virtio/virtio_ring.c

+33 −0
Original line number Diff line number Diff line
@@ -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,

include/linux/virtio.h

+2 −0
Original line number Diff line number Diff line
@@ -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