MFC r268480:

  Add accessor to get the number of free descriptors in the virtqueue

2 files changed, 8 insertions, 0 deletions

diff --git a/sys/dev/virtio/virtqueue.c b/sys/dev/virtio/virtqueue.c
index 5eda6cd..79fe245 100644
--- a/sys/dev/virtio/virtqueue.c
+++ b/sys/dev/virtio/virtqueue.c
@@ -375,6 +375,13 @@ virtqueue_size(struct virtqueue *vq)
 }
 
 int
+virtqueue_nfree(struct virtqueue *vq)
+{
+
+	return (vq->vq_free_cnt);
+}
+
+int
 virtqueue_empty(struct virtqueue *vq)
 {
 
diff --git a/sys/dev/virtio/virtqueue.h b/sys/dev/virtio/virtqueue.h
index 3f507a8..cefb848 100644
--- a/sys/dev/virtio/virtqueue.h
+++ b/sys/dev/virtio/virtqueue.h
@@ -86,6 +86,7 @@ vm_paddr_t virtqueue_paddr(struct virtqueue *vq);
 int	 virtqueue_full(struct virtqueue *vq);
 int	 virtqueue_empty(struct virtqueue *vq);
 int	 virtqueue_size(struct virtqueue *vq);
+int	 virtqueue_nfree(struct virtqueue *vq);
 int	 virtqueue_nused(struct virtqueue *vq);
 void	 virtqueue_notify(struct virtqueue *vq);
 void	 virtqueue_dump(struct virtqueue *vq);