linux-kernel - Re: [PATCH V2 3/5] vDPA: introduce vDPA bus

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Date:   Wed, 19 Feb 2020 10:59:48 +0800
From:   Tiwei Bie <tiwei.bie@...el.com>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     Jason Wang <jasowang@...hat.com>,
        "mst@...hat.com" <mst@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "maxime.coquelin@...hat.com" <maxime.coquelin@...hat.com>,
        "cunming.liang@...el.com" <cunming.liang@...el.com>,
        "zhihong.wang@...el.com" <zhihong.wang@...el.com>,
        "rob.miller@...adcom.com" <rob.miller@...adcom.com>,
        "xiao.w.wang@...el.com" <xiao.w.wang@...el.com>,
        "haotian.wang@...ive.com" <haotian.wang@...ive.com>,
        "lingshan.zhu@...el.com" <lingshan.zhu@...el.com>,
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        Parav Pandit <parav@...lanox.com>,
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        Jiri Pirko <jiri@...lanox.com>,
        Shahaf Shuler <shahafs@...lanox.com>,
        "hanand@...inx.com" <hanand@...inx.com>,
        "mhabets@...arflare.com" <mhabets@...arflare.com>
Subject: Re: [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