On Fri, Mar 10, 2023 at 10:23:16AM -0500, Feng Liu wrote:
>
>
> On 2023-03-10 a.m.8:36, Parav Pandit wrote:
> >
> >
> > > From: Feng Liu <fe...@nvidia.com>
> > > Sent: Friday, March 10, 2023 12:34 AM
> >
> > >
> > > - if (!is_power_of_2(num)) {
> > > - dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u",
> > > num);
> > > - return ERR_PTR(-EINVAL);
> > > - }
> > > -
> >
> > The check is still valid for split q.
> > Maybe the right place for such a check is not the pci transport driver.
> > But layer below where split vs packed q knowledge resides and hence, power
> > of 2 check can be omitted for packed vq.
>
> Hi, Parav
> I think you are right, I checked the virtio spec, only packed virtqueue
> can use queue size which is not power_of_2; so, I think the check can be
> reserved only for split queue here, something like
>
> struct virtio_device *vdev = &vp_dev->vdev;
> if (!virtio_has_feature(vdev, VIRTIO_F_RING_PACKED)
> && !is_power_of_2(num)){
> dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", num);
> return ERR_PTR(-EINVAL);
> }
>
> I will fix it in next version
>
> Hi, Michael and Jason
> Do you have any comments on this?
>
Hmm good point. Which raises the question: so how did you test it then?
--
MST
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