v3->v4: - use OPTS_VALID and OPTS_GET to handle bpf_prog_attach_opts. v2->v3: - rely on DECLARE_LIBBPF_OPTS from libbpf_common.h; - separate "required" and "optional" arguments in bpf_prog_attach_xattr; - convert test_cgroup_attach to prog_tests; - move the new selftest to prog_tests/cgroup_attach_multi. v1->v2: - move DECLARE_LIBBPF_OPTS from libbpf.h to bpf.h (patch 4); - switch new libbpf API to OPTS framework; - switch selftest to libbpf OPTS framework. This patch set adds support for replacing cgroup-bpf programs attached with BPF_F_ALLOW_MULTI flag so that any program in a list can be updated to a new version without service interruption and order of programs can be preserved. Please see patch 3 for details on the use-case and API changes. Other patches: Patch 1 is preliminary refactoring of __cgroup_bpf_attach to simplify it. Patch 2 is minor cleanup of hierarchy_allows_attach. Patch 4 extends libbpf API to support new set of attach attributes. Patch 5 converts test_cgroup_attach to prog_tests. Patch 6 adds selftest coverage for the new API. Andrey Ignatov (6): bpf: Simplify __cgroup_bpf_attach bpf: Remove unused new_flags in hierarchy_allows_attach() bpf: Support replacing cgroup-bpf program in MULTI mode libbpf: Introduce bpf_prog_attach_xattr selftests/bpf: Convert test_cgroup_attach to prog_tests selftests/bpf: Test BPF_F_REPLACE in cgroup_attach_multi include/linux/bpf-cgroup.h | 4 +- include/uapi/linux/bpf.h | 10 + kernel/bpf/cgroup.c | 97 +-- kernel/bpf/syscall.c | 4 +- kernel/cgroup/cgroup.c | 5 +- tools/include/uapi/linux/bpf.h | 10 + tools/lib/bpf/bpf.c | 17 +- tools/lib/bpf/bpf.h | 11 + tools/lib/bpf/libbpf.map | 1 + tools/testing/selftests/bpf/.gitignore | 1 - tools/testing/selftests/bpf/Makefile | 3 +- .../bpf/prog_tests/cgroup_attach_autodetach.c | 111 ++++ .../bpf/prog_tests/cgroup_attach_multi.c | 285 +++++++++ .../bpf/prog_tests/cgroup_attach_override.c | 148 +++++ .../selftests/bpf/test_cgroup_attach.c | 571 ------------------ 15 files changed, 652 insertions(+), 626 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/cgroup_attach_autodetach.c create mode 100644 tools/testing/selftests/bpf/prog_tests/cgroup_attach_multi.c create mode 100644 tools/testing/selftests/bpf/prog_tests/cgroup_attach_override.c delete mode 100644 tools/testing/selftests/bpf/test_cgroup_attach.c -- 2.17.1
