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Date: Tue, 15 Apr 2014 07:41:34 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: Daniel Borkmann <dborkman@...hat.com> Cc: Chema Gonzalez <chema@...gle.com>, David Miller <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org, ast@...mgrid.com Subject: Re: [PATCH] filter: added BPF random opcode On Tue, 2014-04-15 at 09:24 +0200, Daniel Borkmann wrote: > > @@ -773,6 +779,7 @@ static bool convert_bpf_extensions(struct sock_filter *fp, > > case SKF_AD_OFF + SKF_AD_NLATTR: > > case SKF_AD_OFF + SKF_AD_NLATTR_NEST: > > case SKF_AD_OFF + SKF_AD_CPU: > > + case SKF_AD_OFF + SKF_AD_RANDOM: > > I think instead of a function call, this sould rather be modelled > directly into the internal insn set and thus converted differently, > so we can spare us the call. Hmmm... this would need percpu storage, thus preempt disable/enable calls, and prandom_u32_state() is about 40 instructions. This is really not worth the pain. -- 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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