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Date:   Wed, 11 Sep 2019 14:07:38 -0700
From:   Sami Tolvanen <>
To:     Toke Høiland-Jørgensen <>
Cc:     Björn Töpel <>,
        Yonghong Song <>,
        Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Kees Cook <>, Martin Lau <>,
        Song Liu <>,
        "" <>,
        "" <>,
        "" <>,
        Jesper Dangaard Brouer <>
Subject: Re: [PATCH] bpf: validate bpf_func when BPF_JIT is enabled

On Wed, Sep 11, 2019 at 5:09 AM Toke Høiland-Jørgensen <> wrote:
> Björn Töpel <> writes:
> > I ran the "xdp_rxq_info" sample with and without Sami's patch:
> Thanks for doing this!

Yes, thanks for testing this Björn!

> Or (1/22998700 - 1/23923874) * 10**9 == 1.7 nanoseconds of overhead.
> I guess that is not *too* bad; but it's still chipping away at
> performance; anything we could do to lower the overhead?

The check is already rather minimal, but I could move this to a static
inline function to help ensure the compiler doesn't generate an
additional function call for this. I'm also fine with gating this
behind a separate config option, but I'm not sure if that's worth it.
Any thoughts?


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