netdev - Re: [PATCH V3 2/2] bonding support for IPv6 transmit hashing

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Date:	Sat, 30 Jun 2012 13:59:54 +0200
From:	Hannes Frederic Sowa <hannes@...lcolloid.de>
To:	John <linux@...2.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH V3 2/2] bonding support for IPv6 transmit hashing

On Sat, Jun 30, 2012 at 8:17 AM, John <linux@...2.net> wrote:
> diff --git a/Documentation/networking/bonding.txt
> b/Documentation/networking/bonding.txt
> index bfea8a3..5db14fe 100644
> --- a/Documentation/networking/bonding.txt
> +++ b/Documentation/networking/bonding.txt
> @@ -752,12 +752,22 @@ xmit_hash_policy
>                 protocol information to generate the hash.
>
>                 Uses XOR of hardware MAC addresses and IP addresses to
> -               generate the hash.  The formula is
> +               generate the hash.  The IPv4 formula is
>
>                 (((source IP XOR dest IP) AND 0xffff) XOR
>                         ( source MAC XOR destination MAC ))
>                                 modulo slave count
>
> +               The IPv6 forumla is
> +
> +               iphash =
> +                       (source ip quad 2 XOR dest IP quad 2) XOR
> +                       (source ip quad 3 XOR dest IP quad 3) XOR
> +                       (source ip quad 4 XOR dest IP quad 4)
> +
> +               ((iphash >> 16) XOR (iphash >> 8) XOR iphash)
> +                       modulo slave count
> +

Wouldn't it be beneficial to include the ipv6 flow label in the hash
calculation?

Greetings,

  Hannes
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