This patch introduces a helper for storing descriptor in the
descriptor table for split virtqueue.
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/virtio/virtio_ring.c | 39 ++++++++++++++++++++++--------------
1 file changed, 24 insertions(+), 15 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 5509c2643fb1..11dfa0dc8ec1 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -412,6 +412,20 @@ static struct vring_desc *alloc_indirect_split(struct virtqueue *_vq,
return desc;
}
+static inline unsigned int virtqueue_add_desc_split(struct virtqueue *vq,
+ struct vring_desc *desc,
+ unsigned int i,
+ dma_addr_t addr,
+ unsigned int len,
+ u16 flags)
+{
+ desc[i].flags = cpu_to_virtio16(vq->vdev, flags);
+ desc[i].addr = cpu_to_virtio64(vq->vdev, addr);
+ desc[i].len = cpu_to_virtio32(vq->vdev, len);
+
+ return virtio16_to_cpu(vq->vdev, desc[i].next);
+}
+
static inline int virtqueue_add_split(struct virtqueue *_vq,
struct scatterlist *sgs[],
unsigned int total_sg,
@@ -484,11 +498,9 @@ static inline int virtqueue_add_split(struct virtqueue *_vq,
if (vring_mapping_error(vq, addr))
goto unmap_release;
- desc[i].flags = cpu_to_virtio16(_vq->vdev, VRING_DESC_F_NEXT);
- desc[i].addr = cpu_to_virtio64(_vq->vdev, addr);
- desc[i].len = cpu_to_virtio32(_vq->vdev, sg->length);
prev = i;
- i = virtio16_to_cpu(_vq->vdev, desc[i].next);
+ i = virtqueue_add_desc_split(_vq, desc, i, addr, sg->length,
+ VRING_DESC_F_NEXT);
}
}
for (; n < (out_sgs + in_sgs); n++) {
@@ -497,11 +509,11 @@ static inline int virtqueue_add_split(struct virtqueue *_vq,
if (vring_mapping_error(vq, addr))
goto unmap_release;
- desc[i].flags = cpu_to_virtio16(_vq->vdev, VRING_DESC_F_NEXT | VRING_DESC_F_WRITE);
- desc[i].addr = cpu_to_virtio64(_vq->vdev, addr);
- desc[i].len = cpu_to_virtio32(_vq->vdev, sg->length);
prev = i;
- i = virtio16_to_cpu(_vq->vdev, desc[i].next);
+ i = virtqueue_add_desc_split(_vq, desc, i, addr,
+ sg->length,
+ VRING_DESC_F_NEXT |
+ VRING_DESC_F_WRITE);
}
}
/* Last one doesn't continue. */
@@ -515,13 +527,10 @@ static inline int virtqueue_add_split(struct virtqueue *_vq,
if (vring_mapping_error(vq, addr))
goto unmap_release;
- vq->split.vring.desc[head].flags = cpu_to_virtio16(_vq->vdev,
- VRING_DESC_F_INDIRECT);
- vq->split.vring.desc[head].addr = cpu_to_virtio64(_vq->vdev,
- addr);
-
- vq->split.vring.desc[head].len = cpu_to_virtio32(_vq->vdev,
- total_sg * sizeof(struct vring_desc));
+ virtqueue_add_desc_split(_vq, vq->split.vring.desc,
+ head, addr,
+ total_sg * sizeof(struct vring_desc),
+ VRING_DESC_F_INDIRECT);
}
/* We're using some buffers from the free list. */
--
2.25.1
