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

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Message-ID: <d09229bc-c3e4-8d4b-c28f-565fe150ced2@redhat.com>
Date:   Thu, 7 Nov 2019 20:43:29 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
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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