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| author |   Michael S. Tsirkin <mst@redhat.com> | 2013-07-09 13:19:18 +0300 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2013-07-09 12:45:37 -0700 |
| commit | cc229884d3f77ec3b1240e467e0236c3e0647c0c (patch) | |
| tree | a2617adb191288d049629f911b7fef7038557a8e /include/linux | |
| parent | net/cadence/macb: fix bug/typo in extracting gem_irq_read_clear bit (diff) | |
| download | linux-dev-cc229884d3f77ec3b1240e467e0236c3e0647c0c.tar.xz linux-dev-cc229884d3f77ec3b1240e467e0236c3e0647c0c.zip | |
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/linux')
| -rw-r--r-- | include/linux/virtio.h | 4 |
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); |