diff options
| author | Jason Wang <jasowang@redhat.com> | 2015-09-25 13:21:29 +0800 |
|---|---|---|
| committer | Michael Roth <mdroth@linux.vnet.ibm.com> | 2015-10-21 13:40:24 -0500 |
| commit | c2a550d3dfa1f22eac77842aceed6047f6db2320 (patch) | |
| tree | 4f0e2fee81c5d107e35da34a3c408ac4a338bc74 | |
| parent | a64d4cafa9dedad93da475f2f1e41133f433be67 (diff) | |
| download | qemu-c2a550d3dfa1f22eac77842aceed6047f6db2320.tar.gz | |
virtio: introduce virtqueue_discard()
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 <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 29b9f5efd78ae0f9cc02dd169b6e80d2c404bade)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
| -rw-r--r-- | hw/virtio/virtio.c | 7 | ||||
| -rw-r--r-- | include/hw/virtio/virtio.h | 2 |
2 files changed, 9 insertions, 0 deletions
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index bb2c4cf04a..d24f77551a 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -266,6 +266,13 @@ 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 6201ee8ce0..9d09115fab 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); |