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[Qemu-devel] [PATCH 4/8] virtio: add detach element for packed ring(1.1)
From: |
wexu |
Subject: |
[Qemu-devel] [PATCH 4/8] virtio: add detach element for packed ring(1.1) |
Date: |
Wed, 4 Apr 2018 20:54:00 +0800 |
From: Wei Xu <address@hidden>
helper for packed ring
Signed-off-by: Wei Xu <address@hidden>
---
hw/virtio/virtio.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 478df3d..fdee40f 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -561,6 +561,20 @@ static void virtqueue_unmap_sg(VirtQueue *vq, const
VirtQueueElement *elem,
elem->out_sg[i].iov_len);
}
+static void virtqueue_detach_element_split(VirtQueue *vq,
+ const VirtQueueElement *elem, unsigned int len)
+{
+ vq->inuse--;
+ virtqueue_unmap_sg(vq, elem, len);
+}
+
+static void virtqueue_detach_element_packed(VirtQueue *vq,
+ const VirtQueueElement *elem, unsigned int len)
+{
+ vq->inuse -= elem->count;
+ virtqueue_unmap_sg(vq, elem, len);
+}
+
/* virtqueue_detach_element:
* @vq: The #VirtQueue
* @elem: The #VirtQueueElement
@@ -573,8 +587,11 @@ static void virtqueue_unmap_sg(VirtQueue *vq, const
VirtQueueElement *elem,
void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem,
unsigned int len)
{
- vq->inuse--;
- virtqueue_unmap_sg(vq, elem, len);
+ if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) {
+ virtqueue_detach_element_packed(vq, elem, len);
+ } else {
+ virtqueue_detach_element_split(vq, elem, len);
+ }
}
/* virtqueue_unpop:
--
2.7.4
- [Qemu-devel] [RFC PATCH 0/8] virtio-net 1.1 userspace backend support, wexu, 2018/04/04
- [Qemu-devel] [PATCH 2/8] virtio: memory cache for packed ring, wexu, 2018/04/04
- [Qemu-devel] [PATCH 4/8] virtio: add detach element for packed ring(1.1),
wexu <=
- [Qemu-devel] [PATCH 1/8] virtio: feature bit, data structure for packed ring, wexu, 2018/04/04
- [Qemu-devel] [PATCH 3/8] virtio: add empty check for packed ring, wexu, 2018/04/04
- [Qemu-devel] [PATCH 5/8] virtio: notification tweak for packed ring, wexu, 2018/04/04
- [Qemu-devel] [PATCH 6/8] virtio: flush/push support for packed ring, wexu, 2018/04/04
- [Qemu-devel] [PATCH 7/8] virtio: get avail bytes check for packed ring, wexu, 2018/04/04