Commit 3086e9fc authored by Xuan Zhuo's avatar Xuan Zhuo Committed by Michael S. Tsirkin
Browse files

virtio: struct virtio_config_ops add callbacks for queue_reset 



reset can be divided into the following four steps (example):
 1. transport: notify the device to reset the queue
 2. vring:     recycle the buffer submitted
 3. vring:     reset/resize the vring (may re-alloc)
 4. transport: mmap vring to device, and enable the queue

In order to support queue reset, add two callbacks in struct
virtio_config_ops to implement steps 1 and 4.

Signed-off-by: default avatarXuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: default avatarJason Wang <jasowang@redhat.com>
Message-Id: <20220801063902.129329-3-xuanzhuo@linux.alibaba.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent da802961

include/linux/virtio_config.h

+14 −0
Original line number Diff line number Diff line
@@ -78,6 +78,18 @@ struct virtio_shm_region { 
 * @set_vq_affinity: set the affinity for a virtqueue (optional).

 * @get_vq_affinity: get the affinity for a virtqueue (optional).

 * @get_shm_region: get a shared memory region based on the index.

 * @disable_vq_and_reset: reset a queue individually (optional).

 *	vq: the virtqueue

 *	Returns 0 on success or error status

 *	disable_vq_and_reset will guarantee that the callbacks are disabled and

 *	synchronized.

 *	Except for the callback, the caller should guarantee that the vring is

 *	not accessed by any functions of virtqueue.

 * @enable_vq_after_reset: enable a reset queue

 *	vq: the virtqueue

 *	Returns 0 on success or error status

 *	If disable_vq_and_reset is set, then enable_vq_after_reset must also be

 *	set.

 */

typedef void vq_callback_t(struct virtqueue *);

struct virtio_config_ops {
@@ -104,6 +116,8 @@ struct virtio_config_ops { 
			int index);

	bool (*get_shm_region)(struct virtio_device *vdev,

			       struct virtio_shm_region *region, u8 id);

	int (*disable_vq_and_reset)(struct virtqueue *vq);

	int (*enable_vq_after_reset)(struct virtqueue *vq);

};



/* If driver didn't advertise the feature, it will never appear. */