Re: [PATCH v11 10/40] virtio_ring: split: extract the logic of attach vring

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在 2022/6/29 14:56, Xuan Zhuo 写道:
Separate the logic of attach vring, subsequent patches will call it
separately.

Since the "struct vring_virtqueue_split split" is created on the
stack and has been initialized to 0. So using
split->queue_dma_addr/split->queue_size_in_bytes assignment for
queue_dma_addr/queue_size_in_bytes can keep the same as the original
code.

On the other hand, subsequent patches can use the "struct
vring_virtqueue_split split" obtained by vring_alloc_queue_split() to
directly complete the attach operation.

Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>


Acked-by: Jason Wang <jasowang@xxxxxxxxxx>


---
  drivers/virtio/virtio_ring.c | 20 +++++++++++++-------
  1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index cedd340d6db7..9025bd373d3b 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -940,6 +940,18 @@ static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq)
  	return NULL;
  }
+static void virtqueue_vring_attach_split(struct vring_virtqueue *vq,
+					 struct vring_virtqueue_split *vring)
+{
+	vq->split.queue_dma_addr = vring->queue_dma_addr;
+	vq->split.queue_size_in_bytes = vring->queue_size_in_bytes;
+
+	vq->split.vring = vring->vring;
+
+	vq->split.desc_state = vring->desc_state;
+	vq->split.desc_extra = vring->desc_extra;
+}
+
  static int vring_alloc_state_extra_split(struct vring_virtqueue_split *vring)
  {
  	struct vring_desc_state_split *state;
@@ -2287,10 +2299,6 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
  	vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
  		!context;
- vq->split.queue_dma_addr = 0;
-	vq->split.queue_size_in_bytes = 0;
-
-	vq->split.vring = _vring;
  	vq->split.avail_flags_shadow = 0;
  	vq->split.avail_idx_shadow = 0;
@@ -2310,10 +2318,8 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
  		return NULL;
  	}
- vq->split.desc_state = vring.desc_state;
-	vq->split.desc_extra = vring.desc_extra;
-
  	virtqueue_init(vq, vring.vring.num);
+	virtqueue_vring_attach_split(vq, &vring);
spin_lock(&vdev->vqs_list_lock);
  	list_add_tail(&vq->vq.list, &vdev->vqs);

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