Commit ed7c1377 authored by Feng Zhou's avatar Feng Zhou Committed by Alexei Starovoitov
Browse files

selftests/bpf: add test case for bpf_map_lookup_percpu_elem 



test_progs:
Tests new ebpf helpers bpf_map_lookup_percpu_elem.

Signed-off-by: default avatarFeng Zhou <zhoufeng.zf@bytedance.com>
Link: https://lore.kernel.org/r/20220511093854.411-3-zhoufeng.zf@bytedance.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 07343110

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

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// SPDX-License-Identifier: GPL-2.0

// Copyright (c) 2022 Bytedance



#include <test_progs.h>



#include "test_map_lookup_percpu_elem.skel.h"



#define TEST_VALUE  1



void test_map_lookup_percpu_elem(void)

{

	struct test_map_lookup_percpu_elem *skel;

	int key = 0, ret;

	int nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);

	int *buf;



	buf = (int *)malloc(nr_cpus*sizeof(int));

	if (!ASSERT_OK_PTR(buf, "malloc"))

		return;

	memset(buf, 0, nr_cpus*sizeof(int));

	buf[0] = TEST_VALUE;



	skel = test_map_lookup_percpu_elem__open_and_load();

	if (!ASSERT_OK_PTR(skel, "test_map_lookup_percpu_elem__open_and_load"))

		return;

	ret = test_map_lookup_percpu_elem__attach(skel);

	ASSERT_OK(ret, "test_map_lookup_percpu_elem__attach");



	ret = bpf_map_update_elem(bpf_map__fd(skel->maps.percpu_array_map), &key, buf, 0);

	ASSERT_OK(ret, "percpu_array_map update");



	ret = bpf_map_update_elem(bpf_map__fd(skel->maps.percpu_hash_map), &key, buf, 0);

	ASSERT_OK(ret, "percpu_hash_map update");



	ret = bpf_map_update_elem(bpf_map__fd(skel->maps.percpu_lru_hash_map), &key, buf, 0);

	ASSERT_OK(ret, "percpu_lru_hash_map update");



	syscall(__NR_getuid);



	ret = skel->bss->percpu_array_elem_val == TEST_VALUE &&

	      skel->bss->percpu_hash_elem_val == TEST_VALUE &&

	      skel->bss->percpu_lru_hash_elem_val == TEST_VALUE;

	ASSERT_OK(!ret, "bpf_map_lookup_percpu_elem success");



	test_map_lookup_percpu_elem__destroy(skel);

}

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

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// SPDX-License-Identifier: GPL-2.0

// Copyright (c) 2022 Bytedance



#include "vmlinux.h"

#include <bpf/bpf_helpers.h>



int percpu_array_elem_val = 0;

int percpu_hash_elem_val = 0;

int percpu_lru_hash_elem_val = 0;



struct {

	__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);

	__uint(max_entries, 1);

	__type(key, __u32);

	__type(value, __u32);

} percpu_array_map SEC(".maps");



struct {

	__uint(type, BPF_MAP_TYPE_PERCPU_HASH);

	__uint(max_entries, 1);

	__type(key, __u32);

	__type(value, __u32);

} percpu_hash_map SEC(".maps");



struct {

	__uint(type, BPF_MAP_TYPE_LRU_PERCPU_HASH);

	__uint(max_entries, 1);

	__type(key, __u32);

	__type(value, __u32);

} percpu_lru_hash_map SEC(".maps");



SEC("tp/syscalls/sys_enter_getuid")

int sysenter_getuid(const void *ctx)

{

	__u32 key = 0;

	__u32 cpu = 0;

	__u32 *value;



	value = bpf_map_lookup_percpu_elem(&percpu_array_map, &key, cpu);

	if (value)

		percpu_array_elem_val = *value;



	value = bpf_map_lookup_percpu_elem(&percpu_hash_map, &key, cpu);

	if (value)

		percpu_hash_elem_val = *value;



	value = bpf_map_lookup_percpu_elem(&percpu_lru_hash_map, &key, cpu);

	if (value)

		percpu_lru_hash_elem_val = *value;



	return 0;

}



char _license[] SEC("license") = "GPL";