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@xxxxxxxxxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/virtio/virtio_ring.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index d0df887c3ada..948f8da7b780 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -957,6 +957,29 @@ static void virtqueue_vring_init_split(struct vring_virtqueue_split *vring_split
}
}
+static void virtqueue_reinit_split(struct vring_virtqueue *vq)
+{
+ int num;
+
+ num = vq->split.vring.num;
+
+ vq->split.vring.avail->flags = 0;
+ vq->split.vring.avail->idx = 0;
+
+ /* reset avail event */
+ vq->split.vring.avail->ring[num] = 0;
+
+ vq->split.vring.used->flags = 0;
+ vq->split.vring.used->idx = 0;
+
+ /* reset used event */
+ *(__virtio16 *)&(vq->split.vring.used->ring[num]) = 0;
+
+ virtqueue_init(vq, num);
+
+ virtqueue_vring_init_split(&vq->split, vq);
+}
+
static void virtqueue_vring_attach_split(struct vring_virtqueue *vq,
struct vring_virtqueue_split *vring_split)
{
--
2.31.0
