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virtio: right size for virtio_queue_get_avail_size 

Being working on dataplane I notice something strange:

virtio_queue_get_avail_size() used a 64bit size index
for the calculation of the available ring size.

It is quite strange but it did work with the old calculation
of the avail ring, at most with performance penalty,
and I wonder where I missed something.

This patch let use a 16bit size as defined in virtio_ring.h

Signed-off-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Pierre Morel 2015-09-10 13:37:10 +02:00 committed by Michael S. Tsirkin
parent fefa4b128d
commit 50764fc8a3
1 changed files with 1 additions and 1 deletions
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2
hw/virtio/virtio.c
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@ -1460,7 +1460,7 @@ hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n)
hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n)
{
return offsetof(VRingAvail, ring) +
sizeof(uint64_t) * vdev->vq[n].vring.num;
sizeof(uint16_t) * vdev->vq[n].vring.num;
}
hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n)