diff mbox

[V8,3/9] virtio: introduce virtio_get_num_queues()

Message ID 1432880132-28477-4-git-send-email-jasowang@redhat.com
State New
Headers show

Commit Message

Jason Wang May 29, 2015, 6:15 a.m. UTC 
This patch introduces virtio_get_num_queues() which iterates the vqs
array and return the number of virtqueues used by device.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/virtio/virtio.c         | 13 +++++++++++++
 include/hw/virtio/virtio.h |  1 +
 2 files changed, 14 insertions(+)
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Patch

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 0b50f9d..81d8905 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -746,6 +746,19 @@  int virtio_queue_get_num(VirtIODevice *vdev, int n)
     return vdev->vq[n].vring.num;
 }
 
+int virtio_get_num_queues(VirtIODevice *vdev)
+{
+    int i;
+
+    for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
+        if (!virtio_queue_get_num(vdev, i)) {
+            break;
+        }
+    }
+
+    return i;
+}
+
 int virtio_queue_get_id(VirtQueue *vq)
 {
     VirtIODevice *vdev = vq->vdev;
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 8210cb3..175195d 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -175,6 +175,7 @@  void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr);
 hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n);
 void virtio_queue_set_num(VirtIODevice *vdev, int n, int num);
 int virtio_queue_get_num(VirtIODevice *vdev, int n);
+int virtio_get_num_queues(VirtIODevice *vdev);
 void virtio_queue_set_align(VirtIODevice *vdev, int n, int align);
 void virtio_queue_notify(VirtIODevice *vdev, int n);
 uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);