netdev - Re: [B.A.T.M.A.N.] pull request: batman-adv 2011-11-26

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Date:	Fri, 02 Dec 2011 12:57:25 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ordex@...istici.org
Cc:	lindner_marek@...oo.de, netdev@...r.kernel.org,
	b.a.t.m.a.n@...ts.open-mesh.org
Subject: Re: [B.A.T.M.A.N.] pull request: batman-adv 2011-11-26

From: Antonio Quartulli <ordex@...istici.org>
Date: Fri, 2 Dec 2011 18:12:16 +0100

> First of all I think you are referring to patch 08/10, in which I moved a
> skb_linearise() operation.
> 
> To be sure it is really needed, I backtracked the code flow and noted down any
> eventual psbk_may_pull() (or any other linearisation operation). The result is:
> 
> => in batman_skb_recv()
> 	- pskb_may_pull(2)
>   => in recv_tt_query()
>   	  - pskb_may_pull(sizeof(header))
> 	  - skb_linearise()
> 
> Actually it seems we haven't any useless linearisation.
> Would you mind explain us where you actually found the problem, please?
> 
> It might also be that I misunderstood your advice.

You only need to call pskb_may_pull() on the parts of the packet you want to
access directly to parse headers etc.

If you use that interface properly, you never need to linearize, ever.
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