netdev - [RFC] act_cpu: redirect skb receiving to a special CPU.

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Date:	Sat, 5 Jun 2010 18:56:13 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Tom Herbert <therbert@...gle.com>,
	Jamal Hadi Salim <hadi@...erus.ca>
Cc:	Linux Netdev List <netdev@...r.kernel.org>
Subject: [RFC] act_cpu: redirect skb receiving to a special CPU.

I am going to implement a CPU action, which can be used with ingress
qdisc to redirect skb receiving to a special cpu. It is much like RPS,
but more flexible:

* choose the hash function with the help of cls_flow.c
* pin special traffic to a dedicate CPU
* weighted packets distributing

act_cpu will use the function enqueue_to_backlog() supplied by RPS to
redirect skb receiving, and have two kind paramter:

* cpu CPUID - the ID of CPU, which handles this traffic
* map OFFSET - map the mirror class ID to CPUID: CPUID = mirror class ID + CPUID

sch_ingress will be enhanced to support class tree.

-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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