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author | Feng Zhou <zhoufeng.zf@bytedance.com> | 2022-05-18 10:50:53 +0800 |
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committer | Andrii Nakryiko <andrii@kernel.org> | 2022-05-20 15:07:41 -0700 |
commit | 7aa424e02a04bba5ecc84afe9b58b16e9e0b34f8 (patch) | |
tree | ed4c41be3b16f960b58ec727a3a4cb69a07ca463 /tools/testing | |
parent | 834650b50ed283d9d34a32b425d668256bf2e487 (diff) | |
download | linux-7aa424e02a04bba5ecc84afe9b58b16e9e0b34f8.tar.gz linux-7aa424e02a04bba5ecc84afe9b58b16e9e0b34f8.tar.bz2 linux-7aa424e02a04bba5ecc84afe9b58b16e9e0b34f8.zip |
selftests/bpf: Fix some bugs in map_lookup_percpu_elem testcase
comments from Andrii Nakryiko, details in here:
https://lore.kernel.org/lkml/20220511093854.411-1-zhoufeng.zf@bytedance.com/T/
use /* */ instead of //
use libbpf_num_possible_cpus() instead of sysconf(_SC_NPROCESSORS_ONLN)
use 8 bytes for value size
fix memory leak
use ASSERT_EQ instead of ASSERT_OK
add bpf_loop to fetch values on each possible CPU
Fixes: ed7c13776e20c74486b0939a3c1de984c5efb6aa ("selftests/bpf: add test case for bpf_map_lookup_percpu_elem")
Signed-off-by: Feng Zhou <zhoufeng.zf@bytedance.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20220518025053.20492-1-zhoufeng.zf@bytedance.com
Diffstat (limited to 'tools/testing')
-rw-r--r-- | tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c | 48 | ||||
-rw-r--r-- | tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c | 64 |
2 files changed, 73 insertions, 39 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c b/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c index 58b24c2112b0..bfb1bf3fd427 100644 --- a/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c +++ b/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c @@ -1,30 +1,38 @@ // SPDX-License-Identifier: GPL-2.0 -// Copyright (c) 2022 Bytedance +/* 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; + __u64 key = 0, sum; + int ret, i, nr_cpus = libbpf_num_possible_cpus(); + __u64 *buf; - buf = (int *)malloc(nr_cpus*sizeof(int)); + buf = malloc(nr_cpus*sizeof(__u64)); 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; + for (i = 0; i < nr_cpus; i++) + buf[i] = i; + sum = (nr_cpus - 1) * nr_cpus / 2; + + skel = test_map_lookup_percpu_elem__open(); + if (!ASSERT_OK_PTR(skel, "test_map_lookup_percpu_elem__open")) + goto exit; + + skel->rodata->my_pid = getpid(); + skel->rodata->nr_cpus = nr_cpus; + + ret = test_map_lookup_percpu_elem__load(skel); + if (!ASSERT_OK(ret, "test_map_lookup_percpu_elem__load")) + goto cleanup; + ret = test_map_lookup_percpu_elem__attach(skel); - ASSERT_OK(ret, "test_map_lookup_percpu_elem__attach"); + if (!ASSERT_OK(ret, "test_map_lookup_percpu_elem__attach")) + goto cleanup; ret = bpf_map_update_elem(bpf_map__fd(skel->maps.percpu_array_map), &key, buf, 0); ASSERT_OK(ret, "percpu_array_map update"); @@ -37,10 +45,14 @@ void test_map_lookup_percpu_elem(void) 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__detach(skel); + + ASSERT_EQ(skel->bss->percpu_array_elem_sum, sum, "percpu_array lookup percpu elem"); + ASSERT_EQ(skel->bss->percpu_hash_elem_sum, sum, "percpu_hash lookup percpu elem"); + ASSERT_EQ(skel->bss->percpu_lru_hash_elem_sum, sum, "percpu_lru_hash lookup percpu elem"); +cleanup: test_map_lookup_percpu_elem__destroy(skel); +exit: + free(buf); } diff --git a/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c b/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c index 5d4ef86cbf48..ca827b1092da 100644 --- a/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c +++ b/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c @@ -1,52 +1,74 @@ // SPDX-License-Identifier: GPL-2.0 -// Copyright (c) 2022 Bytedance +/* 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; +__u64 percpu_array_elem_sum = 0; +__u64 percpu_hash_elem_sum = 0; +__u64 percpu_lru_hash_elem_sum = 0; +const volatile int nr_cpus; +const volatile int my_pid; struct { __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY); __uint(max_entries, 1); __type(key, __u32); - __type(value, __u32); + __type(value, __u64); } percpu_array_map SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_PERCPU_HASH); __uint(max_entries, 1); - __type(key, __u32); - __type(value, __u32); + __type(key, __u64); + __type(value, __u64); } percpu_hash_map SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_LRU_PERCPU_HASH); __uint(max_entries, 1); - __type(key, __u32); - __type(value, __u32); + __type(key, __u64); + __type(value, __u64); } percpu_lru_hash_map SEC(".maps"); +struct read_percpu_elem_ctx { + void *map; + __u64 sum; +}; + +static int read_percpu_elem_callback(__u32 index, struct read_percpu_elem_ctx *ctx) +{ + __u64 key = 0; + __u64 *value; + + value = bpf_map_lookup_percpu_elem(ctx->map, &key, index); + if (value) + ctx->sum += *value; + return 0; +} + SEC("tp/syscalls/sys_enter_getuid") int sysenter_getuid(const void *ctx) { - __u32 key = 0; - __u32 cpu = 0; - __u32 *value; + struct read_percpu_elem_ctx map_ctx; - value = bpf_map_lookup_percpu_elem(&percpu_array_map, &key, cpu); - if (value) - percpu_array_elem_val = *value; + if (my_pid != (bpf_get_current_pid_tgid() >> 32)) + return 0; - value = bpf_map_lookup_percpu_elem(&percpu_hash_map, &key, cpu); - if (value) - percpu_hash_elem_val = *value; + map_ctx.map = &percpu_array_map; + map_ctx.sum = 0; + bpf_loop(nr_cpus, read_percpu_elem_callback, &map_ctx, 0); + percpu_array_elem_sum = map_ctx.sum; - value = bpf_map_lookup_percpu_elem(&percpu_lru_hash_map, &key, cpu); - if (value) - percpu_lru_hash_elem_val = *value; + map_ctx.map = &percpu_hash_map; + map_ctx.sum = 0; + bpf_loop(nr_cpus, read_percpu_elem_callback, &map_ctx, 0); + percpu_hash_elem_sum = map_ctx.sum; + + map_ctx.map = &percpu_lru_hash_map; + map_ctx.sum = 0; + bpf_loop(nr_cpus, read_percpu_elem_callback, &map_ctx, 0); + percpu_lru_hash_elem_sum = map_ctx.sum; return 0; } |