netdev - Re: [PATCH v6 net-next 0/4] ila: Optimization to preserve value of early demux

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Message-Id: <20151215.232544.2135509953686695529.davem@davemloft.net>
Date:	Tue, 15 Dec 2015 23:25:44 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	tom@...bertland.com
Cc:	netdev@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH v6 net-next 0/4] ila: Optimization to preserve value of
 early demux 

From: Tom Herbert <tom@...bertland.com>
Date: Tue, 15 Dec 2015 15:41:34 -0800

> In the current implementation of ILA, LWT is used to perform
> translation on both the input and output paths. This is functional,
> however there is a big performance hit in the receive path. Early
> demux occurs before the routing lookup (a hit actually obviates the
> route lookup). Therefore the stack currently performs early
> demux before translation so that a local connection with ILA
> addresses is never matched. Note that this issue is not just
> with ILA, but pretty much any translated or encapsulated packet
> handled by LWT would miss the opportunity for early demux. Solving
> the general problem seems non trivial since we would need to move
> the route lookup before early demx thereby mitigating the value.
> 
> This patch set addresses the issue for ILA by adding a fast locator
> lookup that occurs before early demux. This done by hooking in to
> NF_INET_PRE_ROUTING
> 
> For the backend we implement an rhashtable that contains identifier
> to locator to mappings. The table also allows more specific matches
> that include original locator and interface.

Series applied, thanks Tom.
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