[dpdk-dev] SRIOV hot unplug

Tetsuya Mukawa mukawa at igel.co.jp
Wed Jul 20 07:16:52 CEST 2016


Hi Eli,

On 2016/07/19 20:18, Eli Britstein wrote:
> 
> 
>> -----Original Message-----
>> From: Tetsuya Mukawa [mailto:mukawa at igel.co.jp]
>> Sent: Tuesday, 19 July, 2016 5:49 AM
>> To: Eli Britstein; dev at 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.

Yes, it will be asynchronous.

> 
>>
>>> 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?

If you have one more network device, you can send and receive some kind
of control messages between host and VM.
It may be okay to use general socket API for this additional network
device. So I guess it's not so difficult to additionally implement it.

Thanks,
Tetsuya

> 
> 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 at intel.com]
>>>> Sent: Sunday, 17 July, 2016 11:53 PM
>>>> To: Eli Britstein; dev at 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 at dpdk.org] On Behalf Of Eli Britstein
>>>>> Sent: Sunday, July 17, 2016 9:58 AM
>>>>> To: dev at 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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