diff mbox

[V4,15/19] virtio: introduce virtio_queue_get_index()

Message ID 1426671309-13645-16-git-send-email-jasowang@redhat.com
State New
Headers show

Commit Message

Jason Wang March 18, 2015, 9:35 a.m. UTC 
This patch introduces a helper that can get the queue index of a
VirtQueue. This is useful when traversing the list of VirtQueues.

Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/virtio/virtio.c         | 5 +++++
 include/hw/virtio/virtio.h | 1 +
 2 files changed, 6 insertions(+)
diff mbox

Patch

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index ca157e8..d4c49ef 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -725,6 +725,11 @@  hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n)
     return vdev->vq[n].pa;
 }
 
+int virtio_queue_get_index(VirtIODevice *vdev, VirtQueue *vq)
+{
+    return vq - vdev->vq;
+}
+
 void virtio_queue_set_num(VirtIODevice *vdev, int n, int num)
 {
     /* Don't allow guest to flip queue between existent and
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index e3adb1d..f148590 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -171,6 +171,7 @@  void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr);
 hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n);
+int virtio_queue_get_index(VirtIODevice *vdev, VirtQueue *vq);
 void virtio_queue_set_num(VirtIODevice *vdev, int n, int num);
 int virtio_queue_get_num(VirtIODevice *vdev, int n);
 void virtio_queue_set_align(VirtIODevice *vdev, int n, int align);