linux-kernel - [PATCH bpf-next 0/3] bpf: btf: json print btf info with bpftool map dump

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Message-ID: <20180620203051.223156973@fb.com>
Date:   Wed, 20 Jun 2018 13:30:51 -0700
From:   Okash Khawaja <osk@...com>
To:     Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Yonghong Song <yhs@...com>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        "David S. Miller" <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <kernel-team@...com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH bpf-next 0/3] bpf: btf: json print btf info with bpftool map dump

Hi,

These patches augment the bpftool's map dump command with BTF info. In
particular, when user runs `bpftool map dump [-j|-p] id <map-id>`, they will
see map data formatted and tagged based upon BTF information associated with
that map. Here is what each patch does:

Patch 1 exports BTF functions inside libbpf, to be used by patch 2.

Patch 2 adds btf_dumper which uses type info exported in patch 1 along
with json_writer to json print or pretty json print map values alongside
btf debug info.

Patch 3 uses btf_dumper to json or pretty print map values when -j or -p
flag is specified to `btf map dump`.

Further details are included in patch descriptions.

Thanks,
Okash