netdev - Re: [PATCH] bpftool: Allow to read btf as raw data

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Message-ID: <20191025200351.GA31835@krava>
Date:   Fri, 25 Oct 2019 22:03:51 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Andrii Nakryiko <andriin@...com>,
        Yonghong Song <yhs@...com>, Martin KaFai Lau <kafai@...com>
Subject: Re: [PATCH] bpftool: Allow to read btf as raw data

On Fri, Oct 25, 2019 at 11:39:01AM -0700, Jakub Kicinski wrote:
> On Thu, 24 Oct 2019 15:30:25 +0200, Jiri Olsa wrote:
> > The bpftool interface stays the same, but now it's possible
> > to run it over BTF raw data, like:
> > 
> >   $ bpftool btf dump file /sys/kernel/btf/vmlinux
> >   [1] INT '(anon)' size=4 bits_offset=0 nr_bits=32 encoding=(none)
> >   [2] INT 'long unsigned int' size=8 bits_offset=0 nr_bits=64 encoding=(none)
> >   [3] CONST '(anon)' type_id=2
> > 
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> 
> Acked-by: Jakub Kicinski <jakub.kicinski@...ronome.com>

[root@...-z-107 bpftool]# ./bpftool btf dump file /sys/kernel/btf/vmlinux  | head -3
[1] INT '(anon)' size=4 bits_offset=0 nr_bits=32 encoding=(none)
[2] INT 'long unsigned int' size=8 bits_offset=0 nr_bits=64 encoding=(none)
[3] CONST '(anon)' type_id=2
[root@...-z-107 bpftool]# lscpu | grep Endian
Byte Order:          Big Endian

thanks,
jirka