netdev - Re: [PATCH] USB host CDC Phonet network interface driver

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Date:	Wed, 22 Jul 2009 10:37:06 +0200
From:	"Rémi Denis-Courmont" 
	<remi.denis-courmont@...ia.com>
To:	ext Dan Williams <dcbw@...hat.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	ext Marcel Holtmann <marcel@...tmann.org>
Subject: Re: [PATCH] USB host CDC Phonet network interface driver

On Tuesday 21 July 2009 16:52:53 ext Dan Williams wrote:
> > This was tested against Nokia E61, Nokia N95, and the existing Phonet
> > gadget function for the Linux composite USB gadget framework.
>
> Is there an example somewhere of how to use Phonet to get a mobile
> broadband connection in place of usb-serial and PPP?

Not yet, I'm afraid.

> I've read the
> Phonet protocol description and other random docs I can find, but can't
> figure out how that would work.  Or does "PC Suite" mode not support
> that?

PC suite does provide access to packet data. The existing pn_pep kernel module 
provides data path (IPv4 or IPv6 packets) and flow control. But GPRS context 
credentials, IP/DNS parameters, setup/teardown, etc, are missing. I am not 
sure where the user/kernel split should be here...

I guess in a perfect world, Linux would provide a common control interface for 
GPRS as it already does WiFi (and maybe soon will for WiMAX?). But I am not 
sure we can unify AT+PPP, Phonet, AT+Ethernet and who knows what else, behind 
a common Netlink interface, especially as AT commands have always been done in 
userland anyway.

Or what did you have in mind?

-- 
Rémi Denis-Courmont
Nokia Devices R&D, Maemo Software, Helsinki

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