netdev - Re: [PATCH net-next] ipv4: use l4 hash for locally generated multipath flows

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Date:	Thu, 29 Oct 2015 07:31:10 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Paolo Abeni <pabeni@...hat.com>,
	Peter Nørlund <pch@...bogen.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, pch@...bogen.com
Subject: Re: [PATCH net-next] ipv4: use l4 hash for locally generated
 multipath flows

On Wed, 2015-10-28 at 18:39 +0100, Paolo Abeni wrote:
> This patch changes how the multipath hash is computed for locally
> generated UDP or TCP flows: now the hash comprises also l4 information
> (source and destination port).
> 
> This allows better utilization of the available paths when the existing
> flows have the same source IP and the same destination IP: with l3 hash,
> even when multiple connections are in place simultaneously, a single path
> will be used, while with l4 hash we can use all the available paths.
> 
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>

Please note that many skb already have a l4 hash. No need to perform yet
another dissection.

This would work even for tunneled traffic...

See commit 4b1b865e4e97e336316f30e32af36d71e98bdabc for an example.


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