netdev - Re: [Patch] fix packet loss and massive ping spikes with PPP multi-link

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Message-ID: <20100326160226.0159ac3b@lxorguk.ukuu.org.uk>
Date:	Fri, 26 Mar 2010 16:02:26 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Richard Hartmann <richih.mailinglist@...il.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-ppp@...r.kernel.org
Subject: Re: [Patch] fix packet loss and massive ping spikes with PPP
 multi-link

> We are fully aware that this code is not nearly up for inclusion into
> the kernel. What we hope to achieve is that someone with the skills to
> do this properly will introduce an option to turn off fragmentation on
> PPP multi-link or to just do away with it completely.

You should be able to manage that I'm sure:

The main thing will be to take this chunk, strip out the // stuff and
then make it a function of its own so you've got clean code in the main
path of the form

#ifdef CONFIG_PPP_MULTILINK
	if (ml_explode) {
		if (!ppp_mp_explode(...)
	..
	} else {
		ppp_mp_roundrobin(...)
	}

and your bits as a new routine. You can then do this

static int ml_explode = 1;
module_param(ml_explode, int, 0600);
MODULE_PARM_DESC(ml_expode, "Set this to zero to disabling multilink \
	fragmentation when talking to cisco devices");

which will let you load the module with the option ml_explode = 0 if you
want that property.

Making it runtime per link selectable would be nicer but thats a bit more
work.

Alan

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