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Re: [libvirt] PF interface brought down if guest using a VF in hostdev mode under 802.1Qbh



> -----Original Message-----
> From: Nishank Trivedi (nistrive)
> Sent: Wednesday, August 08, 2012 10:22 AM
> To: Laine Stump; libvir-list redhat com
> Cc: Christian Benvenuti (benve)
> Subject: Re: [libvirt] PF interface brought down if guest using a VF in hostdev mode under 802.1Qbh
> 
> 
> On 8/7/12 8:15 PM, "Laine Stump" <laine laine org> wrote:
> 
> >
> >Yes, I believe you are correct that virNetDevSetOnline is being called
> >with the wrong device name (I could be wrong though - is there maybe
> >some odd rule that the PF must be UP before the VFs will be up?
> 
> PF should be UP prior to VF only if there is some proxy'ing or some
> control data being sent by PF on behalf of VF. Same could be true for
> bringing VF down.
> 
> >In case
> >case, we certainly shouldn't be setting the PF to IFF_DOWN). But in the
> >case of PCI passthrough, does it even need to be called at all?
> 
> Not for PF for sure. While VF is getting disassociated with port profile,
> VF interface still needs to be brought down. So virNetDevSetOnline should
> be passed VF interface, if vf >= 0.

Right, this looks like a bug.
Most likely we somehow did not catch it when this patchset

  https://www.redhat.com/archives/libvir-list/2012-March/msg00015.html

got reviewed.

Thanks 
/Chris

> >
> >Cc'ing Roopa in case she missed this in all the other traffic.
> 
> Invalid email id, cc'ing Christian instead.
> 
> Thanks,
> Nishank



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