[PATCH bpf-next v3 0/3] Add prog_kfunc feature probe

Tao Chen
2025-01-24T14:44:44Z

More and more kfunc functions are being added to the kernel.
Different prog types have different restrictions when using kfunc.
Therefore, prog_kfunc probe is added to check whether it is supported,
and the use of this api will be added to bpftool later.

Change list:
- v2 -> v3:
- rename parameter off with btf_fd
- extract the common part for libbpf_probe_bpf_{helper,kfunc}
- v2
https://lore.kernel.org/bpf/20250123170555.291896-1-chen.dylane@gmail.com

- v1 -> v2:
- check unsupported prog type like probe_bpf_helper
- add off parameter for module btf
- check verifier info when kfunc id invalid
- v1
https://lore.kernel.org/bpf/20250122171359.232791-1-chen.dylane@gmail.com

Tao Chen (3):
libbpf: Refactor libbpf_probe_bpf_helper
libbpf: Add libbpf_probe_bpf_kfunc API
selftests/bpf: Add libbpf_probe_bpf_kfunc API selftests

tools/lib/bpf/libbpf.h | 17 ++++-
tools/lib/bpf/libbpf.map | 1 +
tools/lib/bpf/libbpf_probes.c | 68 +++++++++++++++----
.../selftests/bpf/prog_tests/libbpf_probes.c | 35 ++++++++++
4 files changed, 108 insertions(+), 13 deletions(-)

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2.43.0