[PATCH v5 15/22] virtio: queue_reset: add helper
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: 2022-02-14 08:14:53
Also in:
bpf, virtualization
Subsystem:
the rest, virtio core · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang, Eugenio Pérez
Add helper for virtio queue reset. * virtio_reset_vq: reset a queue individually * virtio_enable_resetq: enable a reset queue Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- include/linux/virtio_config.h | 38 +++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+)
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 8cde339d40b4..cd7f7f44ce38 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h@@ -233,6 +233,44 @@ int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs, desc); } +/** + * virtio_reset_vq - reset a queue individually + * @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. + */ +static inline +int virtio_reset_vq(struct virtqueue *vq) +{ + if (!vq->vdev->config->reset_vq) + return -ENOENT; + + return vq->vdev->config->reset_vq(vq); +} + +/** + * virtio_enable_resetq - enable a reset queue + * @vq: the virtqueue + * + * returns 0 on success or error status + * + */ +static inline +int virtio_enable_resetq(struct virtqueue *vq) +{ + if (!vq->vdev->config->enable_reset_vq) + return -ENOENT; + + return vq->vdev->config->enable_reset_vq(vq); +} + /** * virtio_device_ready - enable vq use in probe function * @vdev: the device
--
2.31.0