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

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Message-ID: <20090725001957.1241e968@lxorguk.ukuu.org.uk>
Date:	Sat, 25 Jul 2009 00:19:57 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Marcel Holtmann <marcel@...tmann.org>
Cc:	Oliver Neukum <oliver@...kum.org>,
	Rémi Denis-Courmont 
	<remi.denis-courmont@...ia.com>,
	ext Dan Williams <dcbw@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH] USB host CDC Phonet network interface driver

> we don't want PPP at all. It is just plain stupid and a total braindead
> idea. Non of the GSM/UMTS networks talk PPP over the air interface or
> actually anywhere in their stack. The PPP is just between the host OS
> and the card. It is a pointless encapsulation of IP packets that comes
> from the POTS stuff where PPP over a telephone line made sense.

Well yes. A 3G USB modem is a lovely example of compatibility gone mad

It runs

	an emulated PPP session
	over an emulated serial port
	over a serial port multiplex emulating multiple serial ports
	over an emulated serial port
	over a USB link which has perfectly good packet facilities
	into the Linux kernel
	which makes it look like a legacy modem device
	which is managed by a set of software tools written for 9600 baud
		modems


Unfortunately fixing that has to start at the vendor firmware end, and
that is a lot of interfaces for SMS, voice dialing, fax and god knows
what else as well as data.
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