[PATCH bpf-next 00/13] bpf: Add tracing_multi link support for bpf progs

[Leon Hwang <leon.hwang@linux.dev>]

Similar to the tracing_multi link support for kernel functions [1], add
support for bpf progs.

When attaching to bpf progs, it must attaches to the target by text poke
way.

[1] https://lore.kernel.org/bpf/20260606123955.345967-1-jolsa@kernel.org/

Leon Hwang (13):
  bpf: Initialize ftrace_managed in bpf_trampoline_get
  bpf: Factor out update_fentry_multi helper
  bpf: Drop unnecessary ftrace_location() in update_fentry_multi()
  bpf: Add tracing_multi link support for bpf progs
  libbpf: Add tracing_multi link support for bpf progs
  bpf: Add tracing_multi link fdinfo support for bpf progs
  bpf: Add tracing_multi link info support for bpf progs
  selftests/bpf: Add tracing_multi bpf prog attach test
  selftests/bpf: Add tracing_multi bpf prog attach failure tests
  selftests/bpf: Add tracing_multi bpf prog cookie test
  selftests/bpf: Add tracing_multi bpf prog rollback test
  selftests/bpf: Add tracing_multi bpf prog link info test
  selftests/bpf: Test tailcall with fentry.multi

 include/linux/bpf.h                           |   3 +
 include/uapi/linux/bpf.h                      |   6 +-
 kernel/bpf/trampoline.c                       |  87 +++---
 kernel/bpf/verifier.c                         |  22 +-
 kernel/trace/bpf_trace.c                      | 212 ++++++++++++---
 tools/bpf/bpftool/link.c                      |  59 +++-
 tools/include/uapi/linux/bpf.h                |   6 +-
 tools/lib/bpf/bpf.c                           |   1 +
 tools/lib/bpf/bpf.h                           |   2 +
 tools/lib/bpf/libbpf.c                        |  39 ++-
 tools/lib/bpf/libbpf.h                        |   4 +-
 tools/lib/bpf/libbpf_internal.h               |   1 +
 .../selftests/bpf/prog_tests/fill_link_info.c | 170 ++++++++++--
 .../selftests/bpf/prog_tests/tailcalls.c      |  62 +++++
 .../selftests/bpf/prog_tests/tracing_multi.c  | 254 ++++++++++++++++++
 .../selftests/bpf/progs/tracing_multi_bpf.c   |  61 +++++
 16 files changed, 869 insertions(+), 120 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_bpf.c

--
2.55.0