netdev - Re: [PATCH V2] ifcvf: move IRQ request/free to status change handlers

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Message-ID: <572ed6af-7a04-730e-c803-a41868091e88@redhat.com>
Date:   Wed, 13 May 2020 15:18:21 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Zhu, Lingshan" <lingshan.zhu@...el.com>, mst@...hat.com,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:     lulu@...hat.com, dan.daly@...el.com, cunming.liang@...el.com
Subject: Re: [PATCH V2] ifcvf: move IRQ request/free to status change handlers


On 2020/5/13 下午12:42, Zhu, Lingshan wrote:
>
>
> On 5/13/2020 12:12 PM, Jason Wang wrote:
>>
>> On 2020/5/12 下午4:00, Zhu Lingshan wrote:
>>> This commit move IRQ request and free operations from probe()
>>> to VIRTIO status change handler to comply with VIRTIO spec.
>>>
>>> VIRTIO spec 1.1, section 2.1.2 Device Requirements: Device Status Field
>>> The device MUST NOT consume buffers or send any used buffer
>>> notifications to the driver before DRIVER_OK.
>>
>>
>> This comment needs to be checked as I said previously. It's only 
>> needed if we're sure ifcvf can generate interrupt before DRIVER_OK.
>>
>>
>>>
>>> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
>>> ---
>>> changes from V1:
>>> remove ifcvf_stop_datapath() in status == 0 handler, we don't need 
>>> to do this
>>> twice; handle status == 0 after DRIVER_OK -> !DRIVER_OK handler 
>>> (Jason Wang)
>>
>>
>> Patch looks good to me, but with this patch ping cannot work on my 
>> machine. (It works without this patch).
>>
>> Thanks
> This is strange, it works on my machines, let's have a check offline.
>
> Thanks,
> BR
> Zhu Lingshan


I give it a try with virito-vpda and a tiny userspace. Either works.

So it could be an issue of qemu codes.

Let's wait for Cindy to test if it really works.

Thanks