netdev - Re: [net-next v4 01/12] Implementation of Virtual Bus

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Message-ID: <20200521201009.GD17583@ziepe.ca>
Date:   Thu, 21 May 2020 17:10:09 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Cc:     Parav Pandit <parav@...lanox.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Dave Ertman <david.m.ertman@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "sassmann@...hat.com" <sassmann@...hat.com>,
        "galpress@...zon.com" <galpress@...zon.com>,
        "selvin.xavier@...adcom.com" <selvin.xavier@...adcom.com>,
        "sriharsha.basavapatna@...adcom.com" 
        <sriharsha.basavapatna@...adcom.com>,
        "benve@...co.com" <benve@...co.com>,
        "bharat@...lsio.com" <bharat@...lsio.com>,
        "xavier.huwei@...wei.com" <xavier.huwei@...wei.com>,
        Yishai Hadas <yishaih@...lanox.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        "mkalderon@...vell.com" <mkalderon@...vell.com>,
        "aditr@...are.com" <aditr@...are.com>,
        "ranjani.sridharan@...ux.intel.com" 
        <ranjani.sridharan@...ux.intel.com>,
        "pierre-louis.bossart@...ux.intel.com" 
        <pierre-louis.bossart@...ux.intel.com>,
        Kiran Patil <kiran.patil@...el.com>,
        Andrew Bowers <andrewx.bowers@...el.com>
Subject: Re: [net-next v4 01/12] Implementation of Virtual Bus

On Thu, May 21, 2020 at 07:43:58PM +0200, gregkh@...uxfoundation.org wrote:
> On Thu, May 21, 2020 at 02:57:55PM +0000, Parav Pandit wrote:
> > Hi Greg, Jason,
> > 
> > On 5/20/2020 12:32 PM, Jeff Kirsher wrote:
> > > From: Dave Ertman <david.m.ertman@...el.com>
> > > 
> > 
> > > +static const
> > > +struct virtbus_dev_id *virtbus_match_id(const struct virtbus_dev_id *id,
> > > +					struct virtbus_device *vdev)
> > > +{
> > > +	while (id->name[0]) {
> > > +		if (!strcmp(vdev->match_name, id->name))
> > > +			return id;
> > 
> > Should we have VID, DID based approach instead of _any_ string chosen by
> > vendor drivers?
> 
> No, because:
> 
> > This will required central place to define the VID, DID of the vdev in
> > vdev_ids.h to have unique ids.
> 
> That's not a good way to run things :)
> 
> Have the virtbus core create the "name", as it really doesn't matter
> what it is, just that it is unique, right?

It is being used like the compatible string in OF. Look at where
"sof-ipc-test" appears in the SOF patches.

So it has to be a compile time static, and it has to be broadly global
in some fashion since it appears in a mod alias.

I don't think the name "sof-ipc-test" is particularly good by these
metrics.

Jason