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Date:   Thu, 25 Apr 2019 21:48:12 -0700
From:   Alexei Starovoitov <>
To:     Andrii Nakryiko <>
Cc:     Andrii Nakryiko <>,
        Network Development <>,
        bpf <>
Subject: Re: [PATCH v4 bpf-next 0/4] add btf dumping to bpftool

On Thu, Apr 25, 2019 at 4:08 PM Andrii Nakryiko <> wrote:
> This patch set adds a new `bpftool btf dump` sub-command, which allows to dump
> BTF contents (only types for now). Currently it only outputs low-level
> content, almost 1:1 with binary BTF format, but follow up patches will add
> ability to dump BTF types as a compilable C header file. JSON output is
> supported as well.
> Patch #1 adds `btf` sub-command, dumping BTF types in human-readable format.
> It also implements reading .BTF data from ELF file.
> Patch #2 adds minimal documentation with output format examples and different
> ways to specify source of BTF data.
> Patch #3 adds support for btf command in bash-completion/bpftool script.
> Patch #4 fixes minor indentation issue in bash-completion script.
> Output format is mostly following existing format of BPF verifier log, but
> deviates from it in few places. More details are in commit message for patch
> #1.
> Example of output for all supported BTF kinds are in patch #2 as part of
> documentation. Some field names are quite verbose and I'd rather shorten them,
> if we don't feel like being very close to BPF verifier names is a necessity,
> but in this patch I left them exactly the same as in verifier log.
> v3->v4:
>   - reverse Christmas tree (Quentin)
>   - better docs (Quentin)
> v2->v3:
>   - make map's key|value|kv|all suggestion more precise (Quentin)
>   - fix default case indentations (Quentin)
> v1->v2:
>   - fix unnecessary trailing whitespaces in bpftool-btf.rst (Yonghong)
>   - add btf in main.c for a list of possible OBJECTs
>   - handle unknown keyword under `bpftool btf dump` (Yonghong)

Applied. Thanks!

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