[PATCH bpf-next v2 0/3] tools: bpftool: add an option for debug output from libbpf and verifier

[Quentin Monnet <quentin.monnet@netronome.com>]

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.

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/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