netdev - Re: [PATCH 3/5] vDPA: introduce vDPA bus

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Message-ID: <20200120175050.GC3891@mellanox.com>
Date:   Mon, 20 Jan 2020 17:50:55 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
CC:     Jason Wang <jasowang@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
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        <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "tiwei.bie@...el.com" <tiwei.bie@...el.com>,
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        Parav Pandit <parav@...lanox.com>,
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Subject: Re: [PATCH 3/5] vDPA: introduce vDPA bus

On Mon, Jan 20, 2020 at 07:17:26AM -0500, Michael S. Tsirkin wrote:
> On Fri, Jan 17, 2020 at 01:54:42PM +0000, Jason Gunthorpe wrote:
> > > 1) "virtio" vs "vhost", I implemented matching method for this in mdev
> > > series, but it looks unnecessary for vDPA device driver to know about this.
> > > Anyway we can use sysfs driver bind/unbind to switch drivers
> > > 2) virtio device id and vendor id. I'm not sure we need this consider the
> > > two drivers so far (virtio/vhost) are all bus drivers.
> > 
> > As we seem to be contemplating some dynamic creation of vdpa devices I
> > think upon creation time it should be specified what mode they should
> > run it and then all driver binding and autoloading should happen
> > automatically. Telling the user to bind/unbind is a very poor
> > experience.
> 
> Maybe but OTOH it's an existing interface. I think we can reasonably
> start with bind/unbind and then add ability to specify
> the mode later. bind/unbind come from core so they will be
> maintained anyway.

Existing where? For vfio? vfio is the only thing I am aware doing
that, and this is not vfio..

Jason