This series re-factors the bpf-related toolchain for selftests, which
currently duplicated across selftests/{bpf,sched_ext,hid}/. Unify them
into a single includable fragment, tools/testing/selftests/lib.bpf.mk,
and wires up three consumers. We believe this will simplify the work for
configuraing selftests with the bpf, for both the existing and future ones.
Patch 1 adds lib.bpf.mk: it builds the in-tree libbpf.a and a host
bpftool, generates vmlinux.h from the kernel's BTF, compiles *.bpf.c into
BPF objects and skeletons, and exports the include paths, a bpf_link
helper, and BPF_LDLIBS. Use can control the behavior by several knobs
(source layout/suffix, extra headers/cflags, skeleton suffix,
subskeletons, output dirs) that can be used commonly in general cases.
Patch 2 adds a new selftest, test_memcg_stat_cross_cpu, under
selftests/cgroup. This test is a memory-cgroup statistics correctness
test that compares the memcg BPF kfuncs against memory.stat over a whole
cgroup subtree charged across many CPUs, and checks the cross-CPU rstat
flush. It is the first in-tree consumer of lib.bpf.mk outside
selftests/bpf.
Patches 3 and 4 convert the duplicated parts in Makefile for two
existing duplicating bpf consumers, the selftests/hid and
selftests/sched_ext, to lib.bpf.mk. The generated skeletons keep
a byte-identical public API and land in the same locations as before.
The folders build cleanly under both plain make and LLVM=1.
Changes since v1:
- Generalized lib.bpf.mk (source layout/suffix, extra hdrs/cflags,
skeleton suffix, subskeletons, configurable output dirs) so it can
serve hid and sched_ext, not just cgroup.
- Added patch 3 (hid) and patch 4 (sched_ext), converting those folders
to the shared fragment.
Ziyang Men (4):
selftests: add shared lib.bpf.mk to build BPF progs and skeletons
selftests/cgroup: add memcg_stat_cross_cpu correctness test for flush
selftests/hid: build the BPF program via the shared lib.bpf.mk
selftests/sched_ext: build BPF schedulers via the shared lib.bpf.mk
tools/testing/selftests/cgroup/.gitignore | 6 +
tools/testing/selftests/cgroup/Makefile | 21 +
tools/testing/selftests/cgroup/config | 4 +
.../selftests/cgroup/lib/cgroup_util.c | 48 ++
.../cgroup/lib/include/cgroup_util.h | 1 +
.../cgroup/memcg_stat_cross_cpu.bpf.c | 86 ++
.../selftests/cgroup/memcg_stat_cross_cpu.h | 27 +
.../cgroup/test_memcg_stat_cross_cpu.c | 780 ++++++++++++++++++
tools/testing/selftests/hid/Makefile | 182 +---
tools/testing/selftests/lib.bpf.mk | 247 ++++++
tools/testing/selftests/sched_ext/Makefile | 153 +---
11 files changed, 1275 insertions(+), 280 deletions(-)
create mode 100644 tools/testing/selftests/cgroup/memcg_stat_cross_cpu.bpf.c
create mode 100644 tools/testing/selftests/cgroup/memcg_stat_cross_cpu.h
create mode 100644 tools/testing/selftests/cgroup/test_memcg_stat_cross_cpu.c
create mode 100644 tools/testing/selftests/lib.bpf.mk
base-commit: 6eb8711ece2ce27e52e327a5b7a628ed39b97f45
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2.53.0-Meta
