netdev - Re: [PATCH v4 bpf-next 01/14] bpf: Add resolve_btfids tool to resolve BTF IDs in ELF object

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Message-ID: <CAEf4BzZTwQFeoc=bFAFuX4WJCd8cK8L3ohaMrmCv-xy-Tdt8fQ@mail.gmail.com>
Date:   Fri, 26 Jun 2020 13:53:38 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Martin KaFai Lau <kafai@...com>,
        David Miller <davem@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Wenbo Zhang <ethercflow@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Andrii Nakryiko <andriin@...com>,
        Brendan Gregg <bgregg@...flix.com>,
        Florent Revest <revest@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v4 bpf-next 01/14] bpf: Add resolve_btfids tool to resolve
 BTF IDs in ELF object

On Thu, Jun 25, 2020 at 4:48 PM Jiri Olsa <jolsa@...nel.org> wrote:
>
> The resolve_btfids tool scans elf object for .BTF_ids section
> and resolves its symbols with BTF ID values.
>
> It will be used to during linking time to resolve arrays of BTF
> ID values used in verifier, so these IDs do not need to be
> resolved in runtime.
>
> The expected layout of .BTF_ids section is described in btfid.c
> header. Related kernel changes are coming in following changes.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/bpf/resolve_btfids/Build    |  26 ++
>  tools/bpf/resolve_btfids/Makefile |  76 ++++
>  tools/bpf/resolve_btfids/main.c   | 716 ++++++++++++++++++++++++++++++
>  3 files changed, 818 insertions(+)
>  create mode 100644 tools/bpf/resolve_btfids/Build
>  create mode 100644 tools/bpf/resolve_btfids/Makefile
>  create mode 100644 tools/bpf/resolve_btfids/main.c
>

LGTM.

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

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