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Date:   Wed, 9 Sep 2020 09:50:04 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Quentin Monnet <quentin@...valent.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf-next v3 1/3] tools: bpftool: print optional built-in
 features along with version

On Wed, Sep 9, 2020 at 9:25 AM Quentin Monnet <quentin@...valent.com> wrote:
>
> Bpftool has a number of features that can be included or left aside
> during compilation. This includes:
>
> - Support for libbfd, providing the disassembler for JIT-compiled
>   programs.
> - Support for BPF skeletons, used for profiling programs or iterating on
>   the PIDs of processes associated with BPF objects.
>
> In order to make it easy for users to understand what features were
> compiled for a given bpftool binary, print the status of the two
> features above when showing the version number for bpftool ("bpftool -V"
> or "bpftool version"). Document this in the main manual page. Example
> invocations:
>
>     $ bpftool version
>     ./bpftool v5.9.0-rc1
>     features: libbfd, skeletons
>
>     $ bpftool -p version
>     {
>         "version": "5.9.0-rc1",
>         "features": {
>             "libbfd": true,
>             "skeletons": true
>         }
>     }
>
> Some other parameters are optional at compilation
> ("DISASM_FOUR_ARGS_SIGNATURE", LIBCAP support) but they do not impact
> significantly bpftool's behaviour from a user's point of view, so their
> status is not reported.
>
> Available commands and supported program types depend on the version
> number, and are therefore not reported either. Note that they are
> already available, albeit without JSON, via bpftool's help messages.
>
> v3:
> - Use a simple list instead of boolean values for plain output.
>
> v2:
> - Fix JSON (object instead or array for the features).
>
> Signed-off-by: Quentin Monnet <quentin@...valent.com>
> ---

Acked-by: Andrii Nakryiko <andriin@...com>

>  tools/bpf/bpftool/Documentation/bpftool.rst |  8 ++++-
>  tools/bpf/bpftool/main.c                    | 33 +++++++++++++++++++--
>  2 files changed, 38 insertions(+), 3 deletions(-)
>

[...]

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