[PATCH bpf-next 0/5] Attach a cookie to a tracing program.

[Kui-Feng Lee <kuifeng@fb.com>]

Allow users to attach a 64-bits cookie to a BPF program when link it
to fentry, fexit, or fmod_ret of a function.

This changeset includes several major changes.

 - Add a new field bpf_cookie to struct raw_tracepoint, so that a user
   can attach a cookie to a program.

 - Store flags in trampoline frames to provide the flexibility of
   storing more values in these frames.

 - Store the program ID of the current BPF program in the trampoline
   frame.

 - The implmentation of bpf_get_attach_cookie() for tracing programs
   to read the attached cookie.

Kui-Feng Lee (5):
  bpf: Add a flags value on trampoline frames.
  bpf: Detect if a program needs its program ID.
  bpf, x86: Store program ID to trampoline frames.
  bpf: Attach a cookie to a BPF program.
  bpf: Implement bpf_get_attach_cookie() for tracing programs.

 arch/x86/net/bpf_jit_comp.c                   | 53 ++++++++++++++---
 include/linux/bpf.h                           |  3 +
 include/linux/filter.h                        |  3 +-
 include/uapi/linux/bpf.h                      |  1 +
 kernel/bpf/syscall.c                          | 12 ++--
 kernel/bpf/trampoline.c                       | 10 +++-
 kernel/bpf/verifier.c                         |  5 +-
 kernel/trace/bpf_trace.c                      | 45 ++++++++++++++-
 tools/include/uapi/linux/bpf.h                |  1 +
 tools/lib/bpf/bpf.c                           | 14 +++++
 tools/lib/bpf/bpf.h                           |  1 +
 tools/lib/bpf/libbpf.map                      |  1 +
 .../selftests/bpf/prog_tests/bpf_cookie.c     | 57 +++++++++++++++++++
 .../selftests/bpf/progs/test_bpf_cookie.c     | 24 ++++++++
 14 files changed, 211 insertions(+), 19 deletions(-)

-- 
2.30.2