netdev - [PATCH net-next v2 0/2] bpf/tracing: allow user space to query prog array on the same tp

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Date:   Tue, 5 Dec 2017 22:31:27 -0800
From:   Yonghong Song <yhs@...com>
To:     <peterz@...radead.org>, <rostedt@...dmis.org>, <ast@...com>,
        <daniel@...earbox.net>, <kafai@...com>, <netdev@...r.kernel.org>
CC:     <kernel-team@...com>
Subject: [PATCH net-next v2 0/2] bpf/tracing: allow user space to query prog array on the same tp

Commit e87c6bc3852b ("bpf: permit multiple bpf attachments
for a single perf event") added support to attach multiple
bpf programs to a single perf event. Given a perf event
(kprobe, uprobe, or kernel tracepoint), the perf ioctl interface
is used to query bpf programs attached to the same trace event.

There already exists a BPF_PROG_QUERY command for introspection
currently used by cgroup+bpf. We did have an implementation for
querying tracepoint+bpf through the same interface. However, it
looks cleaner to use ioctl() style of api here, since attaching
bpf prog to tracepoint/kuprobe is also done via ioctl.

Patch #1 had the core implementation and patch #2 added
a test case in tools bpf selftests suite.

Changelogs:
v1-> v2:
  - Rebase on top of net-next.
  - Use existing bpf_prog_array_length function instead of
    implementing the same functionality in function
    bpf_prog_array_copy_info.

Yonghong Song (2):
  bpf/tracing: allow user space to query prog array on the same tp
  bpf/tracing: add a bpf test for new ioctl query interface

 include/linux/bpf.h                           |   4 +
 include/uapi/linux/perf_event.h               |   6 +
 kernel/bpf/core.c                             |  21 ++++
 kernel/events/core.c                          |   3 +
 kernel/trace/bpf_trace.c                      |  23 ++++
 tools/include/uapi/linux/perf_event.h         |   6 +
 tools/testing/selftests/bpf/Makefile          |   2 +-
 tools/testing/selftests/bpf/test_progs.c      | 155 ++++++++++++++++++++++++++
 tools/testing/selftests/bpf/test_tracepoint.c |  26 +++++
 9 files changed, 245 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/bpf/test_tracepoint.c

-- 
2.9.5