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[Qemu-devel] [PATCH V2 1/3] virtio: introduce virtqueue_unmap_sg()
From: |
Jason Wang |
Subject: |
[Qemu-devel] [PATCH V2 1/3] virtio: introduce virtqueue_unmap_sg() |
Date: |
Fri, 25 Sep 2015 13:21:28 +0800 |
Factor out sg unmapping logic. This will be reused by the patch that
can discard descriptor.
Cc: Michael S. Tsirkin <address@hidden>
Cc: Andrew James <address@hidden>
Signed-off-by: Jason Wang <address@hidden>
---
Changes from V1:
- Fix use of uninitialized var warning.
---
hw/virtio/virtio.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 0832db9..bb2c4cf 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -243,14 +243,12 @@ int virtio_queue_empty(VirtQueue *vq)
return vring_avail_idx(vq) == vq->last_avail_idx;
}
-void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
- unsigned int len, unsigned int idx)
+static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem,
+ unsigned int len)
{
unsigned int offset;
int i;
- trace_virtqueue_fill(vq, elem, len, idx);
-
offset = 0;
for (i = 0; i < elem->in_num; i++) {
size_t size = MIN(len - offset, elem->in_sg[i].iov_len);
@@ -266,6 +264,14 @@ void virtqueue_fill(VirtQueue *vq, const VirtQueueElement
*elem,
cpu_physical_memory_unmap(elem->out_sg[i].iov_base,
elem->out_sg[i].iov_len,
0, elem->out_sg[i].iov_len);
+}
+
+void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
+ unsigned int len, unsigned int idx)
+{
+ trace_virtqueue_fill(vq, elem, len, idx);
+
+ virtqueue_unmap_sg(vq, elem, len);
idx = (idx + vring_used_idx(vq)) % vq->vring.num;
--
2.1.4
- [Qemu-devel] [PATCH V2 1/3] virtio: introduce virtqueue_unmap_sg(),
Jason Wang <=