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authorMichael S. Tsirkin <mst@redhat.com>2013-07-09 14:19:18 +0400
committerDavid S. Miller <davem@davemloft.net>2013-07-09 23:45:37 +0400
commitcc229884d3f77ec3b1240e467e0236c3e0647c0c (patch)
treea2617adb191288d049629f911b7fef7038557a8e /include
parent01276ed2424eb78c95461545410923d5da154d31 (diff)
downloadlinux-cc229884d3f77ec3b1240e467e0236c3e0647c0c.tar.xz
virtio: support unlocked queue poll
This adds a way to check ring empty state after enable_cb outside any locks. Will be used by virtio_net. Note: there's room for more optimization: caller is likely to have a memory barrier already, which means we might be able to get rid of a barrier here. Deferring this optimization until we do some benchmarking. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/virtio.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 9ff8645b7e0b..72398eea6e86 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -70,6 +70,10 @@ void virtqueue_disable_cb(struct virtqueue *vq);
bool virtqueue_enable_cb(struct virtqueue *vq);
+unsigned virtqueue_enable_cb_prepare(struct virtqueue *vq);
+
+bool virtqueue_poll(struct virtqueue *vq, unsigned);
+
bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
void *virtqueue_detach_unused_buf(struct virtqueue *vq);