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SubjectRe: [PATCH V2 3/5] vDPA: introduce vDPA bus
On Tue, Feb 18, 2020 at 01:56:12PM +0000, Jason Gunthorpe wrote:
> On Mon, Feb 17, 2020 at 02:08:03PM +0800, Jason Wang wrote:
>
> > I thought you were copied in the patch [1], maybe we can move vhost related
> > discussion there to avoid confusion.
> >
> > [1] https://lwn.net/Articles/811210/
>
> Wow, that is .. confusing.
>
> So this is supposed to duplicate the uAPI of vhost-user? But it is
> open coded and duplicated because .. vdpa?

Do you mean the vhost-user in DPDK? There is no vhost-user
in Linux kernel.

Thanks,
Tiwei

>
> > So it's cheaper and simpler to introduce a new bus instead of refactoring a
> > well known bus and API where brunches of drivers and devices had been
> > implemented for years.
>
> If you reason for this approach is to ease the implementation then you
> should talk about it in the cover letters/etc
>
> Maybe it is reasonable to do this because the rework is too great, I
> don't know, but to me this whole thing looks rather messy.
>
> Remember this stuff is all uAPI as it shows up in sysfs, so you can
> easilly get stuck with it forever.
>
> Jason

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