netdev - Re: Open vSwitch Design

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Date:	Fri, 25 Nov 2011 12:14:42 -0800
From:	Jesse Gross <jesse@...ira.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>, jhs@...atatu.com,
	hadi@...erus.ca, netdev <netdev@...r.kernel.org>,
	dev@...nvswitch.org, David Miller <davem@...emloft.net>,
	Chris Wright <chrisw@...hat.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	John Fastabend <john.r.fastabend@...el.com>,
	Justin Pettit <jpettit@...ira.com>
Subject: Re: Open vSwitch Design

On Thu, Nov 24, 2011 at 10:18 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le jeudi 24 novembre 2011 à 21:20 -0800, Stephen Hemminger a écrit :
>
>> The problem is that there are two flow classifiers, one in OpenVswitch
>> in the kernel, and the other in the user space flow manager. I think the
>> issue is that the two have different code.
>
> We have kind of same duplication in kernel already :)
>
> __skb_get_rxhash() and net/sched/cls_flow.c contain roughly the same
> logic...
>
> Maybe its time to factorize the thing, eventually use it in a third
> component (Open vSwitch...)

I agree, there's no need to have three copies of packet header parsing
code and that's certainly something that we would be willing to work
on improving.
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