linux-kernel - Re: [PATCH bpf-next 0/2] bpftool/libbpf: Add probe for large INSN limit

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Message-ID: <20191227181448.GA452@wotan.suse.de>
Date:   Fri, 27 Dec 2019 18:14:48 +0000
From:   Michal Rostecki <mrostecki@...nsuse.org>
To:     mrostecki@...nsuse.org
Cc:     bpf@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next 0/2] bpftool/libbpf: Add probe for large INSN
 limit

On Fri, Dec 27, 2019 at 11:53:44AM +0100, mrostecki@...nsuse.org wrote:
> From: Michal Rostecki <mrostecki@...nsuse.org>
> 
> This series implements a new BPF feature probe which checks for the
> commit c04c0d2b968a ("bpf: increase complexity limit and maximum program
> size"), which increases the maximum program size to 1M. It's based on
> the similar check in Cilium, althogh Cilium is already aiming to use
> bpftool checks and eventually drop all its custom checks.
> 
> Examples of outputs:
> 
> # bpftool feature probe
> [...]
> Scanning miscellaneous eBPF features...
> Large complexity limit and maximum program size (1M) is available
> 
> # bpftool feature probe macros
> [...]
> /*** eBPF misc features ***/
> #define HAVE_HAVE_LARGE_INSN_LIMIT
> 
> # bpftool feature probe -j | jq '.["misc"]'
> {
>   "have_large_insn_limit": true
> }
> 
> Michal Rostecki (2):
>   libbpf: Add probe for large INSN limit
>   bpftool: Add misc secion and probe for large INSN limit
> 
>  tools/bpf/bpftool/feature.c   | 18 ++++++++++++++++++
>  tools/lib/bpf/libbpf.h        |  1 +
>  tools/lib/bpf/libbpf.map      |  1 +
>  tools/lib/bpf/libbpf_probes.c | 23 +++++++++++++++++++++++
>  4 files changed, 43 insertions(+)
> 
> -- 
> 2.16.4
> 

Sorry for sending this twice! I didn't see the thread immediately after
sending the first time, so I though there is some problem with my
@opensuse.org alias or SMTP server not accepting it. Please review this
series, since I'm using @opensuse.org alias for upstream development
more frequently than @suse.de.