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selftests/bpf: Add selftests for bpf_cgroup_ancestor() kfunc

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bpf_cgroup_ancestor() allows BPF programs to access the ancestor of a
struct cgroup *. This patch adds selftests that validate its expected
behavior.

Signed-off-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20221122055458.173143-5-void@manifault.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
David Vernet
2022-11-21 23:54:58 -06:00
committed by Alexei Starovoitov
parent 5ca7867078
commit 227a89cf50
3 changed files with 47 additions and 0 deletions
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tools/testing/selftests/bpf/progs/cgrp_kfunc_common.h
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@@ -23,6 +23,7 @@ struct hash_map {
struct cgroup *bpf_cgroup_acquire(struct cgroup *p) __ksym;
struct cgroup *bpf_cgroup_kptr_get(struct cgroup **pp) __ksym;
void bpf_cgroup_release(struct cgroup *p) __ksym;
struct cgroup *bpf_cgroup_ancestor(struct cgroup *cgrp, int level) __ksym;
static inline struct __cgrps_kfunc_map_value *cgrps_kfunc_map_value_lookup(struct cgroup *cgrp)
{