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

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Date:	Wed, 01 Jun 2011 12:47:19 +0200
From:	"Stefan (metze) Metzmacher" <metze@...ba.org>
To:	Alexey ORISHKO <alexey.orishko@...ricsson.com>
CC:	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 01.06.2011 12:20, schrieb Alexey ORISHKO:
>> -----Original Message-----
>> From: netdev-owner@...r.kernel.org [mailto:netdev-
>> owner@...r.kernel.org] On Behalf Of Stefan Metzmacher
>> Sent: Wednesday, June 01, 2011 12:09 PM
> 
> 
>> -	.flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
>> +	.flags = FLAG_WWAN | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
> 
> This patch will introduce incompatibility with already existing
> applications, which track usbX devices. As a result, end user
> application will stop working.

The same argument would apply to commits
e1e499eef2200c2a7120c9ebf297d48b195cf887 and
c261344d3ce3edac781f9d3c7eabe2e96d8e8fe8,
while they made it into the upstream kernel.

So I would think that such a change should be ok for a next release,
but without backport to stable branches.

> cdc_ncm driver can also be used for local link terminated in device,
> so wwan would be inappropriate name.

Would it be possible to add some autodetection for known devices,
in a similar way the cdc_ether driver does it.

It's really strange that Ericsson F3507g and Ericsson F5521gw appear as
different kind of devices, while using the same kernel version.

And Ericsson F3507g already changed from usbX to wwanX between 2.6.32
(ubuntu 10.04)
and 2.6.38 (ubuntu 11.04).

metze

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