netdev - Re: [PATCH net-next] flow_dissector: remove __flow_hash

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Message-Id: <20150730.155722.69727543232933153.davem@davemloft.net>
Date:	Thu, 30 Jul 2015 15:57:22 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	tom@...bertland.com
Cc:	netdev@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH net-next] flow_dissector: remove
 __flow_hash_consistentify

From: Tom Herbert <tom@...bertland.com>
Date: Wed, 29 Jul 2015 13:49:03 -0700

> The intent of this function was to produce a consistent hash for both
> directions of a flow. However, since we added more inputs to the flow
> hashing (IPv6 flow labels for instance) in a lot of cases we won't get
> the same hash computed for each direction anyway. Also, there is no
> defined correlation between the hashes computed in each direction of a
> flow.
> 
> This patch removes the function since it is not providing significant
> value and is expensive to be called for every packet. If there are
> ever users of the flow_hash_from_keys that did require consistency
> they can swap addresses and ports as needed in the flow_keys before
> calling flow_hash_from_keys.
> 
> Signed-off-by: Tom Herbert <tom@...bertland.com>

The conntrack issue needs to be sorted out before I can consider this
change seriously.
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