Re: [dpdk-dev] SRIOV hot unplug

[Eli Britstein <eli.britstein@toganetworks.com>]

> -----Original Message-----
> From: Tetsuya Mukawa [mailto:mukawa@igel.co.jp]
> Sent: Tuesday, 19 July, 2016 5:49 AM
> To: Eli Britstein; dev@dpdk.org
> Cc: Iremonger, Bernard
> Subject: Re: [dpdk-dev] SRIOV hot unplug
>
> Hi Eli,
>
> On 2016/07/18 17:47, Eli Britstein wrote:
> > Hi Bernard,
> >
> > Thank you for your answer.
> > However, to do this, I have to have some communication protocol to the
> VM's application in order for it to do this sequence and acknowledge that it is
> now safe to proceed with detaching the device.
> > This implies some kind of integration from the host side, which I would like
> to avoid.
>
> I guess you should have some kind of communication channel to notice the
> hotpluging events from host to VM.
[Eli Britstein]
In order just to notice the hotplugging events inside the VM, I can use add some udev action in the VM, in /etc/udev/rules.d/XXX
However, those are asynchronous events. The host proceeds with unplugging without waiting for the VM to acknowledge it.

>
> > Do you think might there be any other way for the application to handle
> such event in a smooth way?
>
> So far, I guess having one more virtio-net device will be easiest way.
[Eli Britstein]
Could you please elaborate your meaning? How do you mean to use this extra virtio-net device?

To clarify: I would like to have my bond device automatically set the vNIC as its primary, and close/remove the VF before it is unplugged.

Thanks,
Eli

>
> Thanks,
> Tetsuya
>
> >
> > Thanks,
> > Eli
> >
> >> -----Original Message-----
> >> From: Iremonger, Bernard [mailto:bernard.iremonger@intel.com]
> >> Sent: Sunday, 17 July, 2016 11:53 PM
> >> To: Eli Britstein; dev@dpdk.org
> >> Cc: Iremonger, Bernard
> >> Subject: RE: SRIOV hot unplug
> >>
> >> Hi Eli,
> >>
> >> The DPDK application in the VM should remove the slave device from
> >> the bond device, stop, close and detach the device in the VM before
> >> doing "virsh detach-device" from the host.
> >>
> >> Regards,
> >>
> >> Bernard.
> >>
> >>
> >>> -----Original Message-----
> >>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Eli Britstein
> >>> Sent: Sunday, July 17, 2016 9:58 AM
> >>> To: dev@dpdk.org
> >>> Subject: [dpdk-dev] SRIOV hot unplug
> >>>
> >>> Hello,
> >>>
> >>> A DPDK application with a DPDK bond device, with 2 slaves: one vnic,
> >>> and another is a SRIOV VF connected as a pathrough.
> >>> The bond device is configured as ACTIVE/BACKUP, and the primary is
> >>> the VF slave.
> >>> Now, I do "virsh detach-device" from the host, and the DPDK process
> >>> in the VM gets segmentation fault, as it tries to poll an address
> >>> that is not mmaped anymore.
> >>> I wonder if this flow is supposed to be supported by DPDK, or not.
> >>> Please advise.
> >>>
> >>> Thanks,
> >>> Eli
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