netdev - Re: [RFC PATCH net-next 1/1] ipv6: add support of ECMP

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Message-ID: <50504C72.1090500@linux-ipv6.org>
Date:	Wed, 12 Sep 2012 17:48:50 +0900
From:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
CC:	bernat@...fy.cx, netdev@...r.kernel.org, davem@...emloft.net,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [RFC PATCH net-next 1/1] ipv6: add support of ECMP

Hello.

Nicolas Dichtel wrote:
> This patch adds the support of equal cost multipath for IPv6.
> 
> The patch is based on a previous work from
> Luc Saillard <luc.saillard@...nd.com>.
> 
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
:
> +config IPV6_MULTIPATH
> +	bool "IPv6: equal cost multipath for IPv6 routing"
> +	depends on IPV6
> +	default y
> +	---help---
> +	  Enable this option to support ECMP for IPv6.
> +	  If unsure, say N.
> +
> +choice
> +	prompt "IPv6: choose Multipath algorithm"
> +	depends on IPV6_MULTIPATH
> +	default IPV6_MULTIPATH_ROUTE
> +	---help---
> +	  Define the method to select route between each possible path.
> +
> +	config IPV6_MULTIPATH_ROUTE
> +	bool "IPv6: MULTIPATH flow algorithm"
> +	---help---
> +	  Multipath routes are chosen according to hash of packet header to
> +	  ensure a flow keeps the same route.
> +
> +	config IPV6_MULTIPATH_RR
> +	bool "IPv6: MULTIPATH round robin algorithm"
> +	---help---
> +	  Multipath routes are chosen according to Round Robin.
> +
> +	config IPV6_MULTIPATH_RANDOM
> +	bool "IPv6: MULTIPATH random algorithm"
> +	---help---
> +	  Multipath routes are chosen in a random fashion.
> +endchoice

We should use hash-based algorithm by default,
according to RFC4311.  See also RFC6438.

Regards,

--yoshfuji
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