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: <201106031250.28041.oneukum@suse.de>
Date:	Fri, 3 Jun 2011 12:50:27 +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, 12:23:21 schrieb Alexey ORISHKO:

> There is no difference between cdc_ncm and cdc_ether devices, besides
> the fact cdc_ncm is more efficient in data transfer and cpu load.
> The problem is that you cannot say much about device functionality based
> just on interface name. As example existing devices with cdc_ether 
> interface could be mobile phone which provides connectivity to 3G network,
> or could be a phone in the mode "over PC", where phone applications
> access internet via broadband connection on PC (to save money).
> 
> Network manager cannot simply make decision which devices can be used
> for mobile broadband access based on interface name. It needs an additional
> info, which does not exist in device descriptor. 

Well, but cdc-ether usually means that you can start up dhcp and use the
interface as a network card. Can the same be done with cdc-ncm or do you always
need to establish a connection through a secondary interface?

	Regards
		Oliver
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