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Message-ID: <20120329093158.GA2275@minipsycho.brq.redhat.com> Date: Thu, 29 Mar 2012 11:31:58 +0200 From: Jiri Pirko <jpirko@...hat.com> To: Eric Dumazet <eric.dumazet@...il.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 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. > > > -- 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
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