From edd9d3291596fe232370d1a983545b4d685df286 Mon Sep 17 00:00:00 2001 From: Xiao Wang Date: Thu, 18 Jun 2015 06:11:49 +0200 Subject: [PATCH 13/20] virtio: introduce virtio_get_num_queues() Message-id: <1434607916-15166-14-git-send-email-jasowang@redhat.com> Patchwork-id: 66311 O-Subject: [RHEL7.2 qemu-kvm-rhev PATCH 13/20] virtio: introduce virtio_get_num_queues() Bugzilla: 1231610 RH-Acked-by: Stefan Hajnoczi RH-Acked-by: Vlad Yasevich RH-Acked-by: Michael S. Tsirkin 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 Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin (cherry picked from commit 8ad176aaed24535f535e0fdb03c538c23017535d) Signed-off-by: Miroslav Rezanina --- hw/virtio/virtio.c | 13 +++++++++++++ include/hw/virtio/virtio.h | 1 + 2 files changed, 14 insertions(+) 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 9706c29..6f49108 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); -- 1.8.3.1