Performing reset on a queue is divided into two steps:
1. reset_vq: reset one vq
2. enable_reset_vq: re-enable the reset queue
In the first step, these tasks will be completed:
1. notify the hardware queue to reset
2. recycle the buffer from vq
3. delete the vq
So add two callbacks reset_vq, enable_reset_vq to struct
virtio_config_ops. The parameters of enable_reset_vq are similar to
those of find_vqs.
Signed-off-by: Xuan Zhuo <xuanz...@linux.alibaba.com>
---
include/linux/virtio_config.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 4d107ad31149..e50a377c27a0 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -74,8 +74,22 @@ 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.
+ * @reset_vq: reset a queue individually
+ * vdev: the device
+ * queue_index: the queue index
+ * callback: callback to free unused bufs
+ * data: pass to callback
+ * returns 0 on success or error status
+ * @enable_reset_vq: enable a reset queue
+ * vdev: the device
+ * queue_index: the queue index
+ * callback: callback for the virtqueue, NULL for vq that do not need a
callback
+ * name: virtqueue names (mainly for debugging), NULL for vq unused by
driver
+ * ctx: ctx
+ * returns vq on success or error status
*/
typedef void vq_callback_t(struct virtqueue *);
+typedef void vq_reset_callback_t(struct virtio_device *vdev, void *buf, void
*data);
struct virtio_config_ops {
void (*enable_cbs)(struct virtio_device *vdev);
void (*get)(struct virtio_device *vdev, unsigned offset,
@@ -100,6 +114,12 @@ struct virtio_config_ops {
int index);
bool (*get_shm_region)(struct virtio_device *vdev,
struct virtio_shm_region *region, u8 id);
+ int (*reset_vq)(struct virtio_device *vdev, u16 queue_index,
+ vq_reset_callback_t *callback, void *data);
+ struct virtqueue *(*enable_reset_vq)(struct virtio_device *vdev,
+ u16 queue_index,
+ vq_callback_t *callback,
+ const char *name, const bool *ctx);
};
/* If driver didn't advertise the feature, it will never appear. */
--
2.31.0
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