linux-kernel - Re: [PATCH v5 3/6] vduse: add vq group support

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Message-ID: <20250929052852-mutt-send-email-mst@kernel.org>
Date: Mon, 29 Sep 2025 05:29:02 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Eugenio Perez Martin <eperezma@...hat.com>
Cc: Yongji Xie <xieyongji@...edance.com>, linux-kernel@...r.kernel.org,
	Maxime Coquelin <mcoqueli@...hat.com>,
	Stefano Garzarella <sgarzare@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Cindy Lu <lulu@...hat.com>,
	virtualization@...ts.linux.dev, Laurent Vivier <lvivier@...hat.com>,
	jasowang@...hat.com
Subject: Re: [PATCH v5 3/6] vduse: add vq group support

On Mon, Sep 29, 2025 at 10:52:45AM +0200, Eugenio Perez Martin wrote:
> On Mon, Sep 29, 2025 at 9:55 AM Michael S. Tsirkin <mst@...hat.com> wrote:
> >
> > On Mon, Sep 29, 2025 at 07:55:59AM +0200, Eugenio Perez Martin wrote:
> > > On Fri, Sep 26, 2025 at 5:27 PM Michael S. Tsirkin <mst@...hat.com> wrote:
> > > >
> > > > On Fri, Sep 26, 2025 at 12:14:29PM +0200, Eugenio Pérez wrote:
> > > > > @@ -1859,6 +1894,7 @@ static int vduse_create_dev(struct vduse_dev_config *config,
> > > > >       dev->device_features = config->features;
> > > > >       dev->device_id = config->device_id;
> > > > >       dev->vendor_id = config->vendor_id;
> > > > > +     dev->ngroups = (dev->api_version < 1) ? 1 : config->ngroups;
> > > >
> > > > Is this < 1 same as VDUSE_API_VERSION_1? If so, maybe use that?
> > > >
> > >
> > > The macro for v0 is called VDUSE_API_VERSION, so I think it is less
> > > intuitive to put:
> > > dev->api_version == VDUSE_API_VERSION
> > >
> > > But I'm ok with the change if you want.
> >
> > Confused. You mean "more intuitive"?
> >
> 
> Ok think I misread your comment,
> 
> I find
> 
> (dev->api_version < 1) ? ...
> 
> more intuitive than
> 
> (dev->api_version == VDUSE_API_VERSION) ? ...
> 
> But now I think you meant
> 
> (dev->api_version < VDUSE_API_VERSION_1) ? ...
> 
> Is that right?

That's right.