[PATCH v2 03/12] virtio: queue_reset: struct virtio_config_ops add callbacks for queue_reset
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: 2022-01-20 06:43:12
Also in:
bpf, virtualization
Subsystem:
the rest, virtio core · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
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 <xuanzhuo@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