[PATCH v3 09/17] virtio_ring: queue_reset: add vring_reset_virtqueue()
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: 2022-01-26 07:36:07
Also in:
bpf, virtualization
Subsystem:
the rest, virtio core · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
Added vring_reset_virtqueue() for reset vring_virtqueue. In this process, vq is removed from the vdev->vqs queue. And the memory of the ring is released Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- drivers/virtio/virtio_ring.c | 12 +++++++++++- include/linux/virtio_ring.h | 5 +++++ 2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 4beb7c7127c1..bba9f3c67b33 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c@@ -2391,11 +2391,21 @@ void vring_del_virtqueue(struct virtqueue *_vq) { struct vring_virtqueue *vq = to_vvq(_vq); - __vring_del_virtqueue(vq); + if (!_vq->reset) + __vring_del_virtqueue(vq); kfree(vq); } EXPORT_SYMBOL_GPL(vring_del_virtqueue); +void vring_reset_virtqueue(struct virtqueue *_vq) +{ + struct vring_virtqueue *vq = to_vvq(_vq); + + __vring_del_virtqueue(vq); + _vq->reset = true; +} +EXPORT_SYMBOL_GPL(vring_reset_virtqueue); + /* Manipulates transport-specific feature bits. */ void vring_transport_features(struct virtio_device *vdev) {
diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index e90323fce4bf..84b55fb8686d 100644
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h@@ -124,6 +124,11 @@ struct virtqueue *vring_new_virtqueue(unsigned int index, */ void vring_del_virtqueue(struct virtqueue *vq); +/* + * Resets a virtqueue. Just frees the ring, not free vq. + */ +void vring_reset_virtqueue(struct virtqueue *vq); + /* Filter out transport-specific feature bits. */ void vring_transport_features(struct virtio_device *vdev);
--
2.31.0