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

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Date:	Fri, 3 Jun 2011 11:45:38 +0200
From:	Alexey ORISHKO <alexey.orishko@...ricsson.com>
To:	"Valdis.Kletnieks@...edu" <Valdis.Kletnieks@...edu>,
	Dan Williams <dcbw@...hat.com>
Cc:	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

> -----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.

Dan, is it in line with your statement?

/alexey

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