netdev - Re: [PATCH V10 6/6] docs: sample driver to demonstrate how to implement virtio-mdev framework

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Message-ID: <b2265e3a-6f86-c21a-2ebd-d0e4eea2886f@redhat.com>
Date:   Thu, 7 Nov 2019 21:32:29 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
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Subject: Re: [PATCH V10 6/6] docs: sample driver to demonstrate how to
 implement virtio-mdev framework


On 2019/11/7 下午9:08, Michael S. Tsirkin wrote:
> On Thu, Nov 07, 2019 at 08:43:29PM +0800, Jason Wang wrote:
>> On 2019/11/7 下午7:21, Michael S. Tsirkin wrote:
>>> On Thu, Nov 07, 2019 at 06:18:45PM +0800, Jason Wang wrote:
>>>> On 2019/11/7 下午5:08, Michael S. Tsirkin wrote:
>>>>> On Wed, Nov 06, 2019 at 09:35:31PM +0800, Jason Wang wrote:
>>>>>> This sample driver creates mdev device that simulate virtio net device
>>>>>> over virtio mdev transport. The device is implemented through vringh
>>>>>> and workqueue. A device specific dma ops is to make sure HVA is used
>>>>>> directly as the IOVA. This should be sufficient for kernel virtio
>>>>>> driver to work.
>>>>>>
>>>>>> Only 'virtio' type is supported right now. I plan to add 'vhost' type
>>>>>> on top which requires some virtual IOMMU implemented in this sample
>>>>>> driver.
>>>>>>
>>>>>> Acked-by: Cornelia Huck<cohuck@...hat.com>
>>>>>> Signed-off-by: Jason Wang<jasowang@...hat.com>
>>>>> I'd prefer it that we call this something else, e.g.
>>>>> mvnet-loopback. Just so people don't expect a fully
>>>>> functional device somehow. Can be renamed when applying?
>>>> Actually, I plan to extend it as another standard network interface for
>>>> kernel. It could be either a standalone pseudo device or a stack device.
>>>> Does this sounds good to you?
>>>>
>>>> Thanks
>>> That's a big change in an interface so it's a good reason
>>> to rename the driver at that point right?
>>> Oherwise users of an old kernel would expect a stacked driver
>>> and get a loopback instead.
>>>
>>> Or did I miss something?
>>
>> My understanding is that it was a sample driver in /doc. It should not be
>> used in production environment. Otherwise we need to move it to
>> driver/virtio.
>>
>> But if you insist, I can post a V11.
>>
>> Thanks
> this can be a patch on top.


Then maybe it's better just extend it to work as a normal networking 
device on top?

Thanks