[PATCH v5 09/22] virtio: queue_reset: struct virtio_config_ops add callbacks for queue_reset
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: 2022-02-14 08:14:34
Also in:
bpf, virtualization
Subsystem:
the rest, virtio core · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang, Eugenio Pérez
Performing reset on a queue is divided into four steps: 1. reset_vq: reset one vq 2. recycle the buffer from vq by virtqueue_detach_unused_buf() 3. release the ring of the vq by vring_release_virtqueue() 4. enable_reset_vq: re-enable the reset queue So add two callbacks reset_vq, enable_reset_vq to struct virtio_config_ops. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- 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 4d107ad31149..8cde339d40b4 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h@@ -74,6 +74,18 @@ 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. + * @reset_vq: reset a queue individually (optional). + * vq: the virtqueue + * Returns 0 on success or error status + * After successfully calling this, be sure to call + * virtqueue_detach_unused_buf() to recycle the buffer in the ring, and + * then call vring_release_virtqueue() to release the vq ring. + * Caller should guarantee that the vring is not accessed by any functions + * of virtqueue. + * @enable_reset_vq: enable a reset queue + * vq: the virtqueue + * Returns 0 on success or error status + * If reset_vq is set, then enable_reset_vq must also be set. */ typedef void vq_callback_t(struct virtqueue *); struct virtio_config_ops {
@@ -100,6 +112,8 @@ 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 virtqueue *vq); + int (*enable_reset_vq)(struct virtqueue *vq); }; /* If driver didn't advertise the feature, it will never appear. */
--
2.31.0