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

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Date:	Thu, 29 Mar 2012 10:45:32 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jiri Pirko <jpirko@...hat.com>
Cc:	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

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) ...



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