From 6457f126c888b3481fdae6f702e616cd0c79646e Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Wed, 5 Sep 2012 21:47:45 +0300 Subject: virtio: support reserved vqs virtio network device multiqueue support reserves vq 3 for future use (useful both for future extensions and to make it pretty - this way receive vqs have even and transmit - odd numbers). Make it possible to skip initialization for specific vq numbers by specifying NULL for name. Document this usage as well as (existing) NULL callback. Drivers using this not coded up yet, so I simply tested with virtio-pci and verified that this patch does not break existing drivers. Signed-off-by: Michael S. Tsirkin Signed-off-by: Rusty Russell --- drivers/lguest/lguest_device.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/lguest') diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c index ccb7dfb028fa..fc92ccbd71dc 100644 --- a/drivers/lguest/lguest_device.c +++ b/drivers/lguest/lguest_device.c @@ -263,6 +263,9 @@ static struct virtqueue *lg_find_vq(struct virtio_device *vdev, struct virtqueue *vq; int err; + if (!name) + return NULL; + /* We must have this many virtqueues. */ if (index >= ldev->desc->num_vq) return ERR_PTR(-ENOENT); -- cgit v1.2.3