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

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Message-Id: <200907241558.55235.remi.denis-courmont@nokia.com>
Date:	Fri, 24 Jul 2009 15:58:54 +0300
From:	"Rémi Denis-Courmont" 
	<remi.denis-courmont@...ia.com>
To:	ext Dan Williams <dcbw@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:	ext Marcel Holtmann <marcel@...tmann.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH] USB host CDC Phonet network interface driver

On Thursday 23 July 2009 17:34:52 ext Dan Williams wrote:
> There are any number of devices that expose only one AT port (which of
> course gets used by PPP for data) and then a proprietary port.  The
> proprietary port usually uses a custom USB protocol that can also handle
> SMS, status, RSSI, etc while the AT/PPP port is being used by ppp.
>
> So if that's the case for phonet, maybe you just want to provide either
> (a) documentation of the setup/status/sms/etc protocols, or (b) a shim
> library implementation for them that handles communication with the
> device itself.

Eventually, Ofono should get the missing bits for GPRS-via-Phonet.

> But IMHO, the call setup stuff is probably better done from userspace.

I was referring to cellular data connectivity. Indeed, I wouldn't propose 
Netlink for network selection and circuit-switched services like SMS or voice 
calls :)

> It's a really hard API to abstract.  I guess you could write a netlink
> API for it like we have for 802.11, but with GSM/CDMA the standards are
> so widely ignored that it's just going to be impossible to get a stable
> kernel API for anything like this.

Really, you only need a way to:
- create a device, e.g. like IPIP tunnel devices,
- set it up: access point name, and optionally username and password,
- bring it up, get IP and DNS configurations from the network,
- watch for context suspend events: IFF_NOCARRIER could do that,
- and eventually tear down.

In fact, it seems much simpler than 802.11. Well OK, I ignored "details" such 
as secondary contexts and quality of service.

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

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