netdev - Re: Query about skb scatter / gather

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Message-Id: <200903091602.05102.remi.denis-courmont@nokia.com>
Date:	Mon, 9 Mar 2009 16:02:04 +0200
From:	"Rémi Denis-Courmont" 
	<remi.denis-courmont@...ia.com>
To:	"ext Brandeburg, Jesse" <jesse.brandeburg@...el.com>
Cc:	Amar Mudrankit <amar.mudrankit@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Query about skb scatter / gather

On Friday 06 March 2009 21:47:22 ext Brandeburg, Jesse wrote:
> frag_list can only be safely used in rare cases where you know that
> the ip defragmentation code will not be called.  It links multiple
> skb's together to form one large packet (for receive)

Uh? Sure, nested fragments do not work.
But... My reading of ip_frag_reasm() is that you can always use fragments 
list. If this happens the defragmentation code will split your skb into two, 
so as to avoid nested fragments. What's the problem with that?

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

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