[PATCH v13 15/42] virtio_ring: split: reserve vring_align, may_reduce_num

[Xuan Zhuo]

In vring_alloc_queue_split() save vring_align, may_reduce_num to
structure vring_virtqueue_split. Used to create a new vring when
implementing resize.

Signed-off-by: Xuan Zhuo <xuanzhuo at linux.alibaba.com>
Acked-by: Jason Wang <jasowang at redhat.com>
---
 drivers/virtio/virtio_ring.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index aa5dda96824e..b6fda91c8059 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -105,6 +105,13 @@ struct vring_virtqueue_split {
 	/* DMA address and size information */
 	dma_addr_t queue_dma_addr;
 	size_t queue_size_in_bytes;
+
+	/*
+	 * The parameters for creating vrings are reserved for creating new
+	 * vring.
+	 */
+	u32 vring_align;
+	bool may_reduce_num;
 };
 
 struct vring_virtqueue_packed {
@@ -1071,6 +1078,9 @@ static int vring_alloc_queue_split(struct vring_virtqueue_split *vring_split,
 	vring_split->queue_dma_addr = dma_addr;
 	vring_split->queue_size_in_bytes = vring_size(num, vring_align);
 
+	vring_split->vring_align = vring_align;
+	vring_split->may_reduce_num = may_reduce_num;
+
 	return 0;
 }
 
-- 
2.31.0