Re: [dpdk-dev] SRIOV hot unplug

[Tetsuya Mukawa <mukawa@igel.co.jp>]

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.

> 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.

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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