[PATCH v2 08/12] virtio: queue_reset: add helper
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: 2022-01-20 06:43:25
Also in:
bpf, virtualization
Subsystem:
the rest, virtio core · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
Add helper for virtio queue reset. * virtio_reset_vq: reset a queue individually * virtio_enable_resetq: enable a reset queue In the virtio_reset_vq(), these tasks will be completed: 1. notify the hardware queue to reset 2. recycle the buffer from vq 3. delete the vq Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- include/linux/virtio_config.h | 43 +++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+)
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index e50a377c27a0..f84347f4e4ee 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h@@ -239,6 +239,49 @@ int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs, desc); } +/** + * virtio_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 + * + */ +static inline +int virtio_reset_vq(struct virtio_device *vdev, u16 queue_index, + vq_reset_callback_t *callback, void *data) +{ + if (!vdev->config->reset_vq) + return -ENOENT; + + return vdev->config->reset_vq(vdev, queue_index, callback, data); +} + +/** + * virtio_enable_resetq - 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 + * + */ +static inline +struct virtqueue *virtio_enable_resetq(struct virtio_device *vdev, + u16 queue_index, vq_callback_t *callback, + const char *name, const bool *ctx) +{ + if (!vdev->config->enable_reset_vq) + return ERR_PTR(-ENOENT); + + return vdev->config->enable_reset_vq(vdev, queue_index, callback, + name, ctx); +} + /** * virtio_device_ready - enable vq use in probe function * @vdev: the device
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2.31.0