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>
---
drivers/virtio/virtio_ring.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 00b18cf3b4d9..7d4c444b5a9d 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1957,6 +1957,27 @@ static void virtqueue_vring_attach_packed(struct vring_virtqueue *vq,
vq->packed = *vring_packed;
}
+static void virtqueue_reinit_packed(struct vring_virtqueue *vq)
+{
+ int size, i;
+
+ memset(vq->packed.vring.device, 0, vq->packed.event_size_in_bytes);
+ memset(vq->packed.vring.driver, 0, vq->packed.event_size_in_bytes);
+ memset(vq->packed.vring.desc, 0, vq->packed.ring_size_in_bytes);
+
+ size = sizeof(struct vring_desc_state_packed) * vq->packed.vring.num;
+ memset(vq->packed.desc_state, 0, size);
+
+ size = sizeof(struct vring_desc_extra) * vq->packed.vring.num;
+ memset(vq->packed.desc_extra, 0, size);
+
+ for (i = 0; i < vq->packed.vring.num - 1; i++)
+ vq->packed.desc_extra[i].next = i + 1;
+
+ virtqueue_init(vq, vq->packed.vring.num);
+ virtqueue_vring_init_packed(&vq->packed, !!vq->vq.callback);
+}
+
static struct virtqueue *vring_create_virtqueue_packed(
unsigned int index,
unsigned int num,
--
2.31.0
