netdev - [PATCH v3 bpf-next 0/4] libbpf: add perf buffer abstraction and API

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Message-ID: <20190629055309.1594755-1-andriin@fb.com>
Date:   Fri, 28 Jun 2019 22:53:05 -0700
From:   Andrii Nakryiko <andriin@...com>
To:     <andrii.nakryiko@...il.com>, <ast@...com>, <daniel@...earbox.net>,
        <bpf@...r.kernel.org>, <netdev@...r.kernel.org>,
        <kernel-team@...com>, <songliubraving@...com>
CC:     Andrii Nakryiko <andriin@...com>
Subject: [PATCH v3 bpf-next 0/4] libbpf: add perf buffer abstraction and API

This patchset adds a high-level API for setting up and polling perf buffers
associated with BPF_MAP_TYPE_PERF_EVENT_ARRAY map. Details of APIs are
described in corresponding commit.

Patch #1 adds a set of APIs to set up and work with perf buffer.
Patch #2 enhances libbpf to support auto-setting PERF_EVENT_ARRAY map size.
Patch #3 adds test.
Patch #4 converts bpftool map event_pipe to new API.

v2->v3:
- added perf_buffer__new_raw for more low-level control;
- converted bpftool map event_pipe to new API (Daniel);
- fixed bug with error handling in create_maps (Song);

v1->v2:
- add auto-sizing of PERF_EVENT_ARRAY maps;

Andrii Nakryiko (4):
  libbpf: add perf buffer API
  libbpf: auto-set PERF_EVENT_ARRAY size to number of CPUs
  selftests/bpf: test perf buffer API
  tools/bpftool: switch map event_pipe to libbpf's perf_buffer

 tools/bpf/bpftool/map_perf_ring.c             | 207 +++------
 tools/lib/bpf/libbpf.c                        | 397 +++++++++++++++++-
 tools/lib/bpf/libbpf.h                        |  49 +++
 tools/lib/bpf/libbpf.map                      |   4 +
 .../selftests/bpf/prog_tests/perf_buffer.c    |  94 +++++
 .../selftests/bpf/progs/test_perf_buffer.c    |  29 ++
 6 files changed, 634 insertions(+), 146 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/perf_buffer.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_perf_buffer.c

-- 
2.17.1