DMA-related logic is separated from the virtqueue_add_indirect_packed().
DMA address will be saved as sg->dma_address, then
virtqueue_add_indirect_packed() will use it directly. Unmap operation
will be simpler.
The purpose of this is to facilitate subsequent support to receive
dma address mapped by drivers.
Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
---
drivers/virtio/virtio_ring.c | 17 ++++++-----------
1 file changed, 6 insertions(+), 11 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index b4beb51072f7..221ff54fe58b 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1303,7 +1303,7 @@ static int virtqueue_add_indirect_packed(struct vring_virtqueue *vq,
{
struct vring_packed_desc *desc;
struct scatterlist *sg;
- unsigned int i, n, err_idx;
+ unsigned int i, n;
u16 head, id;
dma_addr_t addr;
@@ -1323,16 +1323,14 @@ static int virtqueue_add_indirect_packed(struct vring_virtqueue *vq,
id = vq->free_head;
BUG_ON(id == vq->packed.vring.num);
+ if (virtqueue_map_sgs(vq, sgs, total_sg, out_sgs, in_sgs))
+ return -ENOMEM;
+
for (n = 0; n < out_sgs + in_sgs; n++) {
for (sg = sgs[n]; sg; sg = sg_next(sg)) {
- addr = vring_map_one_sg(vq, sg, n < out_sgs ?
- DMA_TO_DEVICE : DMA_FROM_DEVICE);
- if (vring_mapping_error(vq, addr))
- goto unmap_release;
-
desc[i].flags = cpu_to_le16(n < out_sgs ?
0 : VRING_DESC_F_WRITE);
- desc[i].addr = cpu_to_le64(addr);
+ desc[i].addr = cpu_to_le64(sg->dma_address);
desc[i].len = cpu_to_le32(sg->length);
i++;
}
@@ -1396,10 +1394,7 @@ static int virtqueue_add_indirect_packed(struct vring_virtqueue *vq,
return 0;
unmap_release:
- err_idx = i;
-
- for (i = 0; i < err_idx; i++)
- vring_unmap_desc_packed(vq, &desc[i]);
+ virtqueue_unmap_sgs(vq, sgs, total_sg, out_sgs, in_sgs);
kfree(desc);
--
2.32.0.3.g01195cf9f
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