Commit d0093aae authored by Tejun Heo's avatar Tejun Heo Committed by Alexei Starovoitov
Browse files

selftests/bpf: Add a test case for bpf_cgroup_from_id() 



Add a test case for bpf_cgroup_from_id.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/Y/bBlt+tPozcQgws@slm.duckdns.org


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 332ea1f6

tools/testing/selftests/bpf/prog_tests/cgrp_kfunc.c

+1 −0
Original line number Diff line number Diff line
@@ -84,6 +84,7 @@ static const char * const success_tests[] = { 
	"test_cgrp_xchg_release",

	"test_cgrp_get_release",

	"test_cgrp_get_ancestors",

	"test_cgrp_from_id",

};



void test_cgrp_kfunc(void)

tools/testing/selftests/bpf/progs/cgrp_kfunc_common.h

+1 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 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;

struct cgroup *bpf_cgroup_from_id(u64 cgid) __ksym;



static inline struct __cgrps_kfunc_map_value *cgrps_kfunc_map_value_lookup(struct cgroup *cgrp)

{

tools/testing/selftests/bpf/progs/cgrp_kfunc_success.c

+42 −0
Original line number Diff line number Diff line
@@ -168,3 +168,45 @@ int BPF_PROG(test_cgrp_get_ancestors, struct cgroup *cgrp, const char *path) 


	return 0;

}



SEC("tp_btf/cgroup_mkdir")

int BPF_PROG(test_cgrp_from_id, struct cgroup *cgrp, const char *path)

{

	struct cgroup *parent, *res;

	u64 parent_cgid;



	if (!is_test_kfunc_task())

		return 0;



	/* @cgrp's ID is not visible yet, let's test with the parent */

	parent = bpf_cgroup_ancestor(cgrp, cgrp->level - 1);

	if (!parent) {

		err = 1;

		return 0;

	}



	parent_cgid = parent->kn->id;

	bpf_cgroup_release(parent);



	res = bpf_cgroup_from_id(parent_cgid);

	if (!res) {

		err = 2;

		return 0;

	}



	bpf_cgroup_release(res);



	if (res != parent) {

		err = 3;

		return 0;

	}



	res = bpf_cgroup_from_id((u64)-1);

	if (res) {

		bpf_cgroup_release(res);

		err = 4;

		return 0;

	}



	return 0;

}