Re: [PATCH v12 02/40] virtio: struct virtio_config_ops add callbacks for queue_reset

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在 2022/7/20 11:03, Xuan Zhuo 写道:
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: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>


Acked-by: Jason Wang <jasowang@xxxxxxxxxx>


---
  include/linux/virtio_config.h | 14 ++++++++++++++
  1 file changed, 14 insertions(+)

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index b47c2e7ed0ee..36ec7be1f480 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -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. */




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