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author | Yonghong Song <yhs@fb.com> | 2020-07-23 11:41:21 -0700 |
---|---|---|
committer | Alexei Starovoitov <ast@kernel.org> | 2020-07-25 20:16:34 -0700 |
commit | 60dd49ea65390986a665c462da704927e861e67e (patch) | |
tree | 5c4d32ab95660adde58cfe0aea34e857f1336cf3 /tools/testing | |
parent | 2a7c2fff7dd6e87634e47ddb2d2c7f272708dbbf (diff) | |
download | linux-60dd49ea65390986a665c462da704927e861e67e.tar.gz linux-60dd49ea65390986a665c462da704927e861e67e.tar.bz2 linux-60dd49ea65390986a665c462da704927e861e67e.zip |
selftests/bpf: Add test for bpf array map iterators
Two subtests are added.
$ ./test_progs -n 4
...
#4/20 bpf_array_map:OK
#4/21 bpf_percpu_array_map:OK
...
The bpf_array_map subtest also tested bpf program
changing array element values and send key/value
to user space through bpf_seq_write() interface.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200723184121.591367-1-yhs@fb.com
Diffstat (limited to 'tools/testing')
3 files changed, 247 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c index 72790b600c62..4a02b2222a6d 100644 --- a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c +++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c @@ -17,6 +17,8 @@ #include "bpf_iter_test_kern4.skel.h" #include "bpf_iter_bpf_hash_map.skel.h" #include "bpf_iter_bpf_percpu_hash_map.skel.h" +#include "bpf_iter_bpf_array_map.skel.h" +#include "bpf_iter_bpf_percpu_array_map.skel.h" static int duration; @@ -638,6 +640,161 @@ out: bpf_iter_bpf_percpu_hash_map__destroy(skel); } +static void test_bpf_array_map(void) +{ + __u64 val, expected_val = 0, res_first_val, first_val = 0; + DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts); + __u32 expected_key = 0, res_first_key; + struct bpf_iter_bpf_array_map *skel; + int err, i, map_fd, iter_fd; + struct bpf_link *link; + char buf[64] = {}; + int len, start; + + skel = bpf_iter_bpf_array_map__open_and_load(); + if (CHECK(!skel, "bpf_iter_bpf_array_map__open_and_load", + "skeleton open_and_load failed\n")) + return; + + map_fd = bpf_map__fd(skel->maps.arraymap1); + for (i = 0; i < bpf_map__max_entries(skel->maps.arraymap1); i++) { + val = i + 4; + expected_key += i; + expected_val += val; + + if (i == 0) + first_val = val; + + err = bpf_map_update_elem(map_fd, &i, &val, BPF_ANY); + if (CHECK(err, "map_update", "map_update failed\n")) + goto out; + } + + opts.map_fd = map_fd; + link = bpf_program__attach_iter(skel->progs.dump_bpf_array_map, &opts); + if (CHECK(IS_ERR(link), "attach_iter", "attach_iter failed\n")) + goto out; + + iter_fd = bpf_iter_create(bpf_link__fd(link)); + if (CHECK(iter_fd < 0, "create_iter", "create_iter failed\n")) + goto free_link; + + /* do some tests */ + start = 0; + while ((len = read(iter_fd, buf + start, sizeof(buf) - start)) > 0) + start += len; + if (CHECK(len < 0, "read", "read failed: %s\n", strerror(errno))) + goto close_iter; + + /* test results */ + res_first_key = *(__u32 *)buf; + res_first_val = *(__u64 *)(buf + sizeof(__u32)); + if (CHECK(res_first_key != 0 || res_first_val != first_val, + "bpf_seq_write", + "seq_write failure: first key %u vs expected 0, " + " first value %llu vs expected %llu\n", + res_first_key, res_first_val, first_val)) + goto close_iter; + + if (CHECK(skel->bss->key_sum != expected_key, + "key_sum", "got %u expected %u\n", + skel->bss->key_sum, expected_key)) + goto close_iter; + if (CHECK(skel->bss->val_sum != expected_val, + "val_sum", "got %llu expected %llu\n", + skel->bss->val_sum, expected_val)) + goto close_iter; + + for (i = 0; i < bpf_map__max_entries(skel->maps.arraymap1); i++) { + err = bpf_map_lookup_elem(map_fd, &i, &val); + if (CHECK(err, "map_lookup", "map_lookup failed\n")) + goto out; + if (CHECK(i != val, "invalid_val", + "got value %llu expected %u\n", val, i)) + goto out; + } + +close_iter: + close(iter_fd); +free_link: + bpf_link__destroy(link); +out: + bpf_iter_bpf_array_map__destroy(skel); +} + +static void test_bpf_percpu_array_map(void) +{ + DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts); + struct bpf_iter_bpf_percpu_array_map *skel; + __u32 expected_key = 0, expected_val = 0; + int err, i, j, map_fd, iter_fd; + struct bpf_link *link; + char buf[64]; + void *val; + int len; + + val = malloc(8 * bpf_num_possible_cpus()); + + skel = bpf_iter_bpf_percpu_array_map__open(); + if (CHECK(!skel, "bpf_iter_bpf_percpu_array_map__open", + "skeleton open failed\n")) + return; + + skel->rodata->num_cpus = bpf_num_possible_cpus(); + + err = bpf_iter_bpf_percpu_array_map__load(skel); + if (CHECK(!skel, "bpf_iter_bpf_percpu_array_map__load", + "skeleton load failed\n")) + goto out; + + /* update map values here */ + map_fd = bpf_map__fd(skel->maps.arraymap1); + for (i = 0; i < bpf_map__max_entries(skel->maps.arraymap1); i++) { + expected_key += i; + + for (j = 0; j < bpf_num_possible_cpus(); j++) { + *(__u32 *)(val + j * 8) = i + j; + expected_val += i + j; + } + + err = bpf_map_update_elem(map_fd, &i, val, BPF_ANY); + if (CHECK(err, "map_update", "map_update failed\n")) + goto out; + } + + opts.map_fd = map_fd; + link = bpf_program__attach_iter(skel->progs.dump_bpf_percpu_array_map, &opts); + if (CHECK(IS_ERR(link), "attach_iter", "attach_iter failed\n")) + goto out; + + iter_fd = bpf_iter_create(bpf_link__fd(link)); + if (CHECK(iter_fd < 0, "create_iter", "create_iter failed\n")) + goto free_link; + + /* do some tests */ + while ((len = read(iter_fd, buf, sizeof(buf))) > 0) + ; + if (CHECK(len < 0, "read", "read failed: %s\n", strerror(errno))) + goto close_iter; + + /* test results */ + if (CHECK(skel->bss->key_sum != expected_key, + "key_sum", "got %u expected %u\n", + skel->bss->key_sum, expected_key)) + goto close_iter; + if (CHECK(skel->bss->val_sum != expected_val, + "val_sum", "got %u expected %u\n", + skel->bss->val_sum, expected_val)) + goto close_iter; + +close_iter: + close(iter_fd); +free_link: + bpf_link__destroy(link); +out: + bpf_iter_bpf_percpu_array_map__destroy(skel); +} + void test_bpf_iter(void) { if (test__start_subtest("btf_id_or_null")) @@ -678,4 +835,8 @@ void test_bpf_iter(void) test_bpf_hash_map(); if (test__start_subtest("bpf_percpu_hash_map")) test_bpf_percpu_hash_map(); + if (test__start_subtest("bpf_array_map")) + test_bpf_array_map(); + if (test__start_subtest("bpf_percpu_array_map")) + test_bpf_percpu_array_map(); } diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_bpf_array_map.c b/tools/testing/selftests/bpf/progs/bpf_iter_bpf_array_map.c new file mode 100644 index 000000000000..6286023fd62b --- /dev/null +++ b/tools/testing/selftests/bpf/progs/bpf_iter_bpf_array_map.c @@ -0,0 +1,40 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2020 Facebook */ +#include "bpf_iter.h" +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> + +char _license[] SEC("license") = "GPL"; + +struct key_t { + int a; + int b; + int c; +}; + +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __uint(max_entries, 3); + __type(key, __u32); + __type(value, __u64); +} arraymap1 SEC(".maps"); + +__u32 key_sum = 0; +__u64 val_sum = 0; + +SEC("iter/bpf_map_elem") +int dump_bpf_array_map(struct bpf_iter__bpf_map_elem *ctx) +{ + __u32 *key = ctx->key; + __u64 *val = ctx->value; + + if (key == (void *)0 || val == (void *)0) + return 0; + + bpf_seq_write(ctx->meta->seq, key, sizeof(__u32)); + bpf_seq_write(ctx->meta->seq, val, sizeof(__u64)); + key_sum += *key; + val_sum += *val; + *val = *key; + return 0; +} diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_bpf_percpu_array_map.c b/tools/testing/selftests/bpf/progs/bpf_iter_bpf_percpu_array_map.c new file mode 100644 index 000000000000..85fa710fad90 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/bpf_iter_bpf_percpu_array_map.c @@ -0,0 +1,46 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2020 Facebook */ +#include "bpf_iter.h" +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> + +char _license[] SEC("license") = "GPL"; + +struct key_t { + int a; + int b; + int c; +}; + +struct { + __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY); + __uint(max_entries, 3); + __type(key, __u32); + __type(value, __u32); +} arraymap1 SEC(".maps"); + +/* will set before prog run */ +volatile const __u32 num_cpus = 0; + +__u32 key_sum = 0, val_sum = 0; + +SEC("iter/bpf_map_elem") +int dump_bpf_percpu_array_map(struct bpf_iter__bpf_map_elem *ctx) +{ + __u32 *key = ctx->key; + void *pptr = ctx->value; + __u32 step; + int i; + + if (key == (void *)0 || pptr == (void *)0) + return 0; + + key_sum += *key; + + step = 8; + for (i = 0; i < num_cpus; i++) { + val_sum += *(__u32 *)pptr; + pptr += step; + } + return 0; +} |