Virtualization - May 2020 - [PATCH V2] ifcvf: move IRQ request/free to status change handlers

On 2020/5/19 ??9:51, Cindy Lu wrote:
> Hi ,Jason
> It works ok in the latest version of qemu vdpa code , So I think the
> patch is ok.
> Thanks
> Cindy

Thanks for the testing, (btw, we'd better not do top posting when 
discuss in the community).

So,

Acked-by: Jason Wang <jasowang at redhat.com>


> On Wed, May 13, 2020 at 3:18 PM Jason Wang <jasowang at redhat.com>
wrote:
>>
>> On 2020/5/13 ??12:42, Zhu, Lingshan wrote:
>>>
>>> On 5/13/2020 12:12 PM, Jason Wang wrote:
>>>> On 2020/5/12 ??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 at
intel.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
>>
>>