netdev - Re: [PATCH 3/7] tcp: consolidate paws check

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Date:	Sun, 15 Mar 2009 20:10:38 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ilpo.jarvinen@...sinki.fi
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 3/7] tcp: consolidate paws check

From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Date: Sun, 15 Mar 2009 02:07:51 +0200

> Wow, it was quite tricky to merge that stream of negations
> but I think I finally got it right:
> 
> check & replace_ts_recent:
> (s32)(rcv_tsval - ts_recent) >= 0                  => 0
> (s32)(ts_recent - rcv_tsval) <= 0                  => 0
> 
> discard:
> (s32)(ts_recent - rcv_tsval)  > TCP_PAWS_WINDOW    => 1
> (s32)(ts_recent - rcv_tsval) <= TCP_PAWS_WINDOW    => 0
> 
> I toggled the return values of tcp_paws_check around since
> the old encoding added yet-another negation making tracking
> of truth-values really complicated.
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>

Applied.
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