From 4b59668f0ecb8a151c1e34082ad133121a8482c3 Mon Sep 17 00:00:00 2001
From: Bryan Venteicher <bryanv@FreeBSD.org>
Date: Thu, 10 Jul 2014 05:26:01 +0000
Subject: [PATCH] Add accessor to get the number of free descriptors in the
 virtqueue

MFC after:	1 month
---
 sys/dev/virtio/virtqueue.c | 7 +++++++
 sys/dev/virtio/virtqueue.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/sys/dev/virtio/virtqueue.c b/sys/dev/virtio/virtqueue.c
index 5eda6cd0323..79fe245fb8d 100644
--- a/sys/dev/virtio/virtqueue.c
+++ b/sys/dev/virtio/virtqueue.c
@@ -374,6 +374,13 @@ virtqueue_size(struct virtqueue *vq)
 	return (vq->vq_nentries);
 }
 
+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 3f507a8f0c4..cefb8484559 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);