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[Qemu-devel] [PATCH 2/3] virtio: introduce virtqueue_discard()
From: |
Jason Wang |
Subject: |
[Qemu-devel] [PATCH 2/3] virtio: introduce virtqueue_discard() |
Date: |
Fri, 18 Sep 2015 16:01:09 +0800 |
This patch introduces virtqueue_discard() to discard a descriptor and
unmap the sgs. This will be used by the patch that will discard
descriptor when packet is truncated.
Cc: Michael S. Tsirkin <address@hidden>
Signed-off-by: Jason Wang <address@hidden>
---
hw/virtio/virtio.c | 7 +++++++
include/hw/virtio/virtio.h | 2 ++
2 files changed, 9 insertions(+)
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index eb8d5ca..d24ee80 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -265,6 +265,13 @@ static void virtqueue_unmap_sg(VirtQueue *vq, const
VirtQueueElement *elem,
0, elem->out_sg[i].iov_len);
}
+void virtqueue_discard(VirtQueue *vq, const VirtQueueElement *elem,
+ unsigned int len)
+{
+ vq->last_avail_idx--;
+ virtqueue_unmap_sg(vq, elem, len);
+}
+
void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
unsigned int len, unsigned int idx)
{
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 6201ee8..9d09115 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -146,6 +146,8 @@ void virtio_del_queue(VirtIODevice *vdev, int n);
void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
unsigned int len);
void virtqueue_flush(VirtQueue *vq, unsigned int count);
+void virtqueue_discard(VirtQueue *vq, const VirtQueueElement *elem,
+ unsigned int len);
void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
unsigned int len, unsigned int idx);
--
2.1.4