netdev - Re: [Q/RFC] BPF use in broader scope

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Date:	Fri, 11 May 2012 08:22:57 +0200
From:	Jiri Pirko <jpirko@...hat.com>
To:	Li Yu <raise.sail@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	bhutchings@...arflare.com, shemminger@...tta.com, matt@...abs.org
Subject: Re: [Q/RFC] BPF use in broader scope

Fri, May 11, 2012 at 04:41:31AM CEST, raise.sail@...il.com wrote:
>于 2012年03月29日 17:31, Jiri Pirko 写道:
>>Thu, Mar 29, 2012 at 10:45:32AM CEST, eric.dumazet@...il.com wrote:
>>>On Thu, 2012-03-29 at 10:31 +0200, Jiri Pirko wrote:
>>>>Thu, Mar 29, 2012 at 10:02:25AM CEST, eric.dumazet@...il.com wrote:
>>>>>On Thu, 2012-03-29 at 09:54 +0200, Jiri Pirko wrote:
>>>>>
>>>>>>Yep, I'm aware. I must admit that the JIT code scares me a litte :(
>>>>>>
>>>>>
>>>>>If you add a new XOR instruction in interpreter only, JIT compiler will
>>>>>automatically aborts, so no risk.
>>>>>
>>>>>Each arch maintainer will add the support for the new instructions as
>>>>>separate patches.
>>>>>
>>>>>So you can focus on net/core/filter.c file only.
>>>>>
>>>>
>>>>Ok - I can do this for 2). But for 3) JITs need to be modified. So I
>>>>would like to kindly ask you and Matt if you can do this modification so
>>>>bpf_func takes pointer to mem (scratch store) as second parameter. I'm
>>>>sure it's very easy for you to do.
>>>
>>>I am not sure why you want this.
>>>
>>>This adds register pressure (at least for x86) ...
>>
>>Well I think that there would become handy to be able to pass some data
>>to bpf_func (other than skb). But it's just an idea.
>>
>
>Hi, Jiri Pirko, any progress of extended BPF? :)
>
>I am interesting in 3) much. For my requirements,
>it just only need BPF has ability to handle arbitrary
>"pre-filled memory area", but not handle both a skb and
>such a memory area at same time, so I think that register
>pressure should not be become the performance bottleneck
>here.
>
>Otherwise, I must construct a fake sk_buff to execute filter
>feature, it is ugly, isn't it?
>
>I guess that Nuno Martins's requirements also are similar.
>
>And, I also would like join this project, if you need.

For my needs it turned out I do not need pre-filled memory. So I dropped
that point.

>
>Thanks
>
>Yu
>
>>>
>>>
>>>
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>
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