[PATCH v11 12/40] virtio_ring: split: introduce virtqueue_reinit_split()

Xuan Zhuo
2022-06-29T06:57:48Z

Introduce a function to initialize vq without allocating new ring,
desc_state, desc_extra.

Subsequent patches will call this function after reset vq to
reinitialize vq.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
---
drivers/virtio/virtio_ring.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 35540daaa1e7..4c8972da5423 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -958,6 +958,25 @@ static void virtqueue_vring_init_split(struct vring_virtqueue *vq)
}
}

+static void virtqueue_reinit_split(struct vring_virtqueue *vq)
+{
+ int size, i;
+
+ memset(vq->split.vring.desc, 0, vq->split.queue_size_in_bytes);
+
+ size = sizeof(struct vring_desc_state_split) * vq->split.vring.num;
+ memset(vq->split.desc_state, 0, size);
+
+ size = sizeof(struct vring_desc_extra) * vq->split.vring.num;
+ memset(vq->split.desc_extra, 0, size);
+
+ for (i = 0; i < vq->split.vring.num - 1; i++)
+ vq->split.desc_extra[i].next = i + 1;
+
+ virtqueue_init(vq, vq->split.vring.num);
+ virtqueue_vring_init_split(vq);
+}
+
static void virtqueue_vring_attach_split(struct vring_virtqueue *vq,
struct vring_virtqueue_split *vring)
{
--
2.31.0