netdev - Re: ipv4: Simplify ARP hash function.

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Message-ID: <CAL1RGDUzN_B0of0Ly6PxxaHM+A+E_1ZA0NTcC6jMmcrcoy0DxQ@mail.gmail.com>
Date:	Fri, 8 Jul 2011 16:11:00 -0700
From:	Roland Dreier <roland@...estorage.com>
To:	David Miller <davem@...emloft.net>
Cc:	johnwheffner@...il.com, mj@....cz, netdev@...r.kernel.org
Subject: Re: ipv4: Simplify ARP hash function.

On Fri, Jul 8, 2011 at 3:32 PM, David Miller <davem@...emloft.net> wrote:
> So what is the cheapest non-linear function we could use?

I'm not comfortable giving cryptographic advice, but even + (addition
with carry) is nonlinear when combined with ^.  However that seems
like the low-order bits might be too predictable.

Maybe * of hash key with a random odd value is good enough?

 - R.
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