netdev - Re: [PATCH] TODO FLAG_POINTTOPOINT => FLAG_WWAN? usbnet/cdc_ncm: mark ncm devices as "mobile broadband devices" with FLAG

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Message-Id: <201106031201.21933.oneukum@suse.de>
Date:	Fri, 3 Jun 2011 12:01:21 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	Alexey ORISHKO <alexey.orishko@...ricsson.com>
Cc:	"Valdis.Kletnieks@...edu" <Valdis.Kletnieks@...edu>,
	Dan Williams <dcbw@...hat.com>,
	Stefan Metzmacher <metze@...ba.org>,
	Oliver Neukum <oliver@...kum.name>,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] TODO FLAG_POINTTOPOINT => FLAG_WWAN? usbnet/cdc_ncm: mark ncm devices as "mobile broadband devices" with FLAG_WWAN

Am Freitag, 3. Juni 2011, 11:45:38 schrieb Alexey ORISHKO:
> > -----Original Message-----
> > From: Valdis.Kletnieks@...edu [mailto:Valdis.Kletnieks@...edu]
> > Sent: Friday, June 03, 2011 2:58 AM
> > 
> > > A follow-on to this is that if you really care about specific
> > devices,
> > > your application can use udev rules to "tag" specific interfaces
> > based
> > > on USB VID/PID/GUID or other device attributes, and check for those
> > > tags in your program.  Use udev (good) or netlink (good) or
> > > SIOCGIFCONF (bad) to enumerate the various network interfaces on the
> > > system and pick the
> > 
> > I think Alexey's point was that the patch will hose up programs that
> > currently do the netlink or  SIOCGIFCONF thing and look for
> > FLAG_POINTTOPOINT.
> 
> Just to clarify, I was objecting to renaming interface name mostly because
> devices which use CDC NCM function might be something different from wwan
> devices. I would prefer to keep a generic name of interface (usbX or ethX).
> 
> As an option anyone can use udev rules to set interface name they want 
> for their device based on VID/PID or MAC address or something else.
> I've already provided udev rule example earlier in this thread.

This is not ideal. Distributions cannot care about every VIP:PID value.
If a device with an NCM interface needs to be treated in a special
manner we'd better have a special name for such interfaces.

	Regards
		Oliver
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