netdev - Re: [PATCH v2 bpf-next 1/3] bpftool: add ability to dump BTF types

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Message-ID: <7c2d6f26-1ed9-83f5-586b-3ce2a8782f94@fb.com>
Date:   Thu, 25 Apr 2019 15:36:08 +0000
From:   Yonghong Song <yhs@...com>
To:     "andrii.nakryiko@...il.com" <andrii.nakryiko@...il.com>,
        Kernel Team <Kernel-team@...com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        Song Liu <songliubraving@...com>, Martin Lau <kafai@...com>,
        "acme@...nel.org" <acme@...nel.org>
CC:     Andrii Nakryiko <andriin@...com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH v2 bpf-next 1/3] bpftool: add ability to dump BTF types



On 4/24/19 10:03 PM, andrii.nakryiko@...il.com wrote:
> From: Andrii Nakryiko <andriin@...com>
> 
> Add new `btf dump` sub-command to bpftool. It allows to dump
> human-readable low-level BTF types representation of BTF types. BTF can
> be retrieved from few different sources:
>    - from BTF object by ID;
>    - from PROG, if it has associated BTF;
>    - from MAP, if it has associated BTF data; it's possible to narrow
>      down types to either key type, value type, both, or all BTF types;
>    - from ELF file (.BTF section).
> 
> Output format mostly follows BPF verifier log format with few notable
> exceptions:
>    - all the type/field/param/etc names are enclosed in single quotes to
>      allow easier grepping and to stand out a little bit more;
>    - FUNC_PROTO output follows STRUCT/UNION/ENUM format of having one
>      line per each argument; this is more uniform and allows easy
>      grepping, as opposed to succinct, but inconvenient format that BPF
>      verifier log is using.
> 
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: Alexei Starovoitov <ast@...com>
> Cc: Yonghong Song <yhs@...com>
> Cc: Martin KaFai Lau <kafai@...com>
> Cc: Song Liu <songliubraving@...com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Signed-off-by: Andrii Nakryiko <andriin@...com>

Acked-by: Yonghong Song <yhs@...com>