netdev - Re: [PATCH v2] Re: WAN: new PPP code for generic HDLC

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Date:	Mon, 21 Apr 2008 20:31:09 +0100
From:	James Chapman <jchapman@...alix.com>
To:	Krzysztof Halasa <khc@...waw.pl>
CC:	David Miller <davem@...emloft.net>, alan@...rguk.ukuu.org.uk,
	akpm@...ux-foundation.org, jeff@...zik.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2] Re: WAN: new PPP code for generic HDLC

Krzysztof Halasa wrote:
> David Miller <davem@...emloft.net> writes:
> 
>> I'll fix it properly because I know you won't do the work.
> 
> Great to read that.
> 
> Just few friendly after all notes so that you don't waste your time
> learning that yourself:
> - my patch didn't give us a third PPP implementation, we already have
>   three: generic PPP, syncppp and PPP for ISDN :-)
> - of those, both generic PPP and (I think) ISDN PPP are in a good
>   shape
> - generic PPP is specialized for dial-up async devices and has the
>   required features (in kernel and in userspace pppd) - auth,
>   multi-line, compression etc. It's a "lets give /dev/ttyS* a network
>   device" implementation.

Generic ppp isn't specialized at all, and it isn't limited to async 
serial devices. PPPoE, PPPoATM and L2TP use it.

> - ISDN PPP does for ISDN cards basically the same as generic PPP does
>   for terminals. They are completely different from syncppp as the
>   needs are completely different. Fixed-line PPP must be small and
>   fast, and self-contained.

<snip>

> That's why I came to an idea that leaving syncppp and the old drivers
> in their current bit-rotting state which nobody can really fix, and
> using another (fourth, and third when syncppp eventually dies) PPP
> implementation is the only way out of this situation.

Can you elaborate on why the code that uses syncppp can't use the 
generic ppp code together with a userspace ppp control protocol 
implementation like pppd?


-- 
James Chapman
Katalix Systems Ltd
http://www.katalix.com
Catalysts for your Embedded Linux software development

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