1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
https://bugs.gentoo.org/560760
From 29b9f5efd78ae0f9cc02dd169b6e80d2c404bade Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang@redhat.com>
Date: Fri, 25 Sep 2015 13:21:29 +0800
Subject: [PATCH 2/3] 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>
---
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 6f2b96c..d0bc72e 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -267,6 +267,13 @@ 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);
--
2.6.0.rc2.230.g3dd15c0
|
GitWeb
