lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Fri, 11 May 2012 10:41:31 +0800
From:	Li Yu <raise.sail@...il.com>
To:	Jiri Pirko <jpirko@...hat.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

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.

Thanks

Yu

>>
>>
>>
> --
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists