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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: Feng Zhou <zhoufeng.zf@bytedance.com>
Link: https://lore.kernel.org/r/20220511093854.411-3-zhoufeng.zf@bytedance.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Feng Zhou 2022-05-11 17:38:54 +08:00 committed by Alexei Starovoitov
parent 07343110b2
commit ed7c13776e
2 changed files with 100 additions and 0 deletions
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46
tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c Normal file
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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);
}

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tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c Normal file
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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";