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

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Date:   Thu, 7 Nov 2019 20:47:06 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
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        stefanha@...hat.com
Subject: Re: [PATCH V10 6/6] docs: sample driver to demonstrate how to
 implement virtio-mdev framework


On 2019/11/7 下午8:43, 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 


Or maybe it's better to rename the type of current mdev from 'virtio' to 
'virtio-loopback'. Then we can add more types in the future.

Thanks