netdev - [PATCH bpf-next v3 0/3] tools: bpftool: add an option for debug output from libbpf and verifier

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Date:   Fri, 24 May 2019 11:36:45 +0100
From:   Quentin Monnet <quentin.monnet@...ronome.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        oss-drivers@...ronome.com,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        Yonghong Song <yhs@...com>, Andrii Nakryiko <andriin@...com>
Subject: [PATCH bpf-next v3 0/3] tools: bpftool: add an option for debug output from libbpf and verifier

Hi,
This series adds an option to bpftool to make it print additional
information via libbpf and the kernel verifier when attempting to load
programs.

A new API function is added to libbpf in order to pass the log_level from
bpftool with the bpf_object__* part of the API.

Options for a finer control over the log levels to use for libbpf and the
verifier could be added in the future, if desired.

v3:
- Fix and clarify commit logs.

v2:
- Do not add distinct options for libbpf and verifier logs, just keep the
  one that sets all log levels to their maximum. Rename the option.
- Do not offer a way to pick desired log levels. The choice is "use the
  option to print all logs" or "stick with the defaults".
- Do not export BPF_LOG_* flags to user header.
- Update all man pages (most bpftool operations use libbpf and may print
  libbpf logs). Verifier logs are only used when attempting to load
  programs for now, so bpftool-prog.rst and bpftool.rst remain the only
  pages updated in that regard.

Previous discussion available at:
https://lore.kernel.org/bpf/20190523105426.3938-1-quentin.monnet@netronome.com/
https://lore.kernel.org/bpf/20190429095227.9745-1-quentin.monnet@netronome.com/

Quentin Monnet (3):
  tools: bpftool: add -d option to get debug output from libbpf
  libbpf: add bpf_object__load_xattr() API function to pass log_level
  tools: bpftool: make -d option print debug output from verifier

 .../bpf/bpftool/Documentation/bpftool-btf.rst |  4 +++
 .../bpftool/Documentation/bpftool-cgroup.rst  |  4 +++
 .../bpftool/Documentation/bpftool-feature.rst |  4 +++
 .../bpf/bpftool/Documentation/bpftool-map.rst |  4 +++
 .../bpf/bpftool/Documentation/bpftool-net.rst |  4 +++
 .../bpftool/Documentation/bpftool-perf.rst    |  4 +++
 .../bpftool/Documentation/bpftool-prog.rst    |  5 ++++
 tools/bpf/bpftool/Documentation/bpftool.rst   |  4 +++
 tools/bpf/bpftool/bash-completion/bpftool     |  2 +-
 tools/bpf/bpftool/main.c                      | 16 ++++++++++-
 tools/bpf/bpftool/main.h                      |  1 +
 tools/bpf/bpftool/prog.c                      | 27 ++++++++++++-------
 tools/lib/bpf/Makefile                        |  2 +-
 tools/lib/bpf/libbpf.c                        | 20 +++++++++++---
 tools/lib/bpf/libbpf.h                        |  6 +++++
 tools/lib/bpf/libbpf.map                      |  5 ++++
 16 files changed, 96 insertions(+), 16 deletions(-)

-- 
2.17.1