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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>
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2 changed files with 100 additions and 0 deletions
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2022 Bytedance
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#include <test_progs.h>
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#include "test_map_lookup_percpu_elem.skel.h"
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#define TEST_VALUE 1
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void test_map_lookup_percpu_elem(void)
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{
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struct test_map_lookup_percpu_elem *skel;
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int key = 0, ret;
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int nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
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int *buf;
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buf = (int *)malloc(nr_cpus*sizeof(int));
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if (!ASSERT_OK_PTR(buf, "malloc"))
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return;
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memset(buf, 0, nr_cpus*sizeof(int));
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buf[0] = TEST_VALUE;
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skel = test_map_lookup_percpu_elem__open_and_load();
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if (!ASSERT_OK_PTR(skel, "test_map_lookup_percpu_elem__open_and_load"))
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return;
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ret = test_map_lookup_percpu_elem__attach(skel);
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ASSERT_OK(ret, "test_map_lookup_percpu_elem__attach");
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ret = bpf_map_update_elem(bpf_map__fd(skel->maps.percpu_array_map), &key, buf, 0);
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ASSERT_OK(ret, "percpu_array_map update");
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ret = bpf_map_update_elem(bpf_map__fd(skel->maps.percpu_hash_map), &key, buf, 0);
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ASSERT_OK(ret, "percpu_hash_map update");
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ret = bpf_map_update_elem(bpf_map__fd(skel->maps.percpu_lru_hash_map), &key, buf, 0);
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ASSERT_OK(ret, "percpu_lru_hash_map update");
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syscall(__NR_getuid);
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ret = skel->bss->percpu_array_elem_val == TEST_VALUE &&
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skel->bss->percpu_hash_elem_val == TEST_VALUE &&
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skel->bss->percpu_lru_hash_elem_val == TEST_VALUE;
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ASSERT_OK(!ret, "bpf_map_lookup_percpu_elem success");
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test_map_lookup_percpu_elem__destroy(skel);
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}
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2022 Bytedance
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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int percpu_array_elem_val = 0;
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int percpu_hash_elem_val = 0;
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int percpu_lru_hash_elem_val = 0;
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, __u32);
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} percpu_array_map SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_HASH);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, __u32);
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} percpu_hash_map SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_LRU_PERCPU_HASH);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, __u32);
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} percpu_lru_hash_map SEC(".maps");
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SEC("tp/syscalls/sys_enter_getuid")
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int sysenter_getuid(const void *ctx)
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{
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__u32 key = 0;
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__u32 cpu = 0;
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__u32 *value;
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value = bpf_map_lookup_percpu_elem(&percpu_array_map, &key, cpu);
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if (value)
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percpu_array_elem_val = *value;
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value = bpf_map_lookup_percpu_elem(&percpu_hash_map, &key, cpu);
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if (value)
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percpu_hash_elem_val = *value;
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value = bpf_map_lookup_percpu_elem(&percpu_lru_hash_map, &key, cpu);
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if (value)
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percpu_lru_hash_elem_val = *value;
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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