From f4199271dae12ae407fa739e7012914ea6b3f37b Mon Sep 17 00:00:00 2001 From: Yafang Shao Date: Wed, 6 Dec 2023 11:53:25 +0000 Subject: selftests/bpf: Add a new cgroup helper open_classid() This new helper allows us to obtain the fd of a net_cls cgroup, which will be utilized in the subsequent patch. Signed-off-by: Yafang Shao Acked-by: Tejun Heo Acked-by: Yonghong Song Link: https://lore.kernel.org/r/20231206115326.4295-3-laoar.shao@gmail.com Signed-off-by: Martin KaFai Lau --- tools/testing/selftests/bpf/cgroup_helpers.c | 16 ++++++++++++++++ tools/testing/selftests/bpf/cgroup_helpers.h | 1 + 2 files changed, 17 insertions(+) (limited to 'tools') diff --git a/tools/testing/selftests/bpf/cgroup_helpers.c b/tools/testing/selftests/bpf/cgroup_helpers.c index 5aa133bf3688..19be9c63d5e8 100644 --- a/tools/testing/selftests/bpf/cgroup_helpers.c +++ b/tools/testing/selftests/bpf/cgroup_helpers.c @@ -689,3 +689,19 @@ int get_cgroup1_hierarchy_id(const char *subsys_name) fclose(file); return found ? id : -1; } + +/** + * open_classid() - Open a cgroupv1 net_cls classid + * + * This function expects the cgroup work dir to be already created, as we + * open it here. + * + * On success, it returns the file descriptor. On failure it returns -1. + */ +int open_classid(void) +{ + char cgroup_workdir[PATH_MAX + 1]; + + format_classid_path(cgroup_workdir); + return open(cgroup_workdir, O_RDONLY); +} diff --git a/tools/testing/selftests/bpf/cgroup_helpers.h b/tools/testing/selftests/bpf/cgroup_helpers.h index ee053641c026..502845160d88 100644 --- a/tools/testing/selftests/bpf/cgroup_helpers.h +++ b/tools/testing/selftests/bpf/cgroup_helpers.h @@ -33,6 +33,7 @@ void cleanup_cgroup_environment(void); int set_classid(void); int join_classid(void); unsigned long long get_classid_cgroup_id(void); +int open_classid(void); int setup_classid_environment(void); void cleanup_classid_environment(void); -- cgit v1.2.3