From 2c2837b09e9ab4874353186599609fa2e1ccabce Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Tue, 28 Apr 2020 17:16:10 -0700 Subject: selftests/bpf: Test bpf_link's get_next_id, get_fd_by_id, and get_obj_info Extend bpf_obj_id selftest to verify bpf_link's observability APIs. Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20200429001614.1544-7-andriin@fb.com --- .../testing/selftests/bpf/prog_tests/bpf_obj_id.c | 110 +++++++++++++++++++-- 1 file changed, 101 insertions(+), 9 deletions(-) (limited to 'tools/testing/selftests/bpf/prog_tests') diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_obj_id.c b/tools/testing/selftests/bpf/prog_tests/bpf_obj_id.c index f10029821e16..7afa4160416f 100644 --- a/tools/testing/selftests/bpf/prog_tests/bpf_obj_id.c +++ b/tools/testing/selftests/bpf/prog_tests/bpf_obj_id.c @@ -1,26 +1,30 @@ // SPDX-License-Identifier: GPL-2.0 #include +#define nr_iters 2 + void test_bpf_obj_id(void) { const __u64 array_magic_value = 0xfaceb00c; const __u32 array_key = 0; - const int nr_iters = 2; const char *file = "./test_obj_id.o"; const char *expected_prog_name = "test_obj_id"; const char *expected_map_name = "test_map_id"; const __u64 nsec_per_sec = 1000000000; - struct bpf_object *objs[nr_iters]; + struct bpf_object *objs[nr_iters] = {}; + struct bpf_link *links[nr_iters] = {}; + struct bpf_program *prog; int prog_fds[nr_iters], map_fds[nr_iters]; /* +1 to test for the info_len returned by kernel */ struct bpf_prog_info prog_infos[nr_iters + 1]; struct bpf_map_info map_infos[nr_iters + 1]; + struct bpf_link_info link_infos[nr_iters + 1]; /* Each prog only uses one map. +1 to test nr_map_ids * returned by kernel. */ __u32 map_ids[nr_iters + 1]; - char jited_insns[128], xlated_insns[128], zeros[128]; + char jited_insns[128], xlated_insns[128], zeros[128], tp_name[128]; __u32 i, next_id, info_len, nr_id_found, duration = 0; struct timespec real_time_ts, boot_time_ts; int err = 0; @@ -36,14 +40,15 @@ void test_bpf_obj_id(void) CHECK(err >= 0 || errno != ENOENT, "get-fd-by-notexist-map-id", "err %d errno %d\n", err, errno); - for (i = 0; i < nr_iters; i++) - objs[i] = NULL; + err = bpf_link_get_fd_by_id(0); + CHECK(err >= 0 || errno != ENOENT, + "get-fd-by-notexist-link-id", "err %d errno %d\n", err, errno); /* Check bpf_obj_get_info_by_fd() */ bzero(zeros, sizeof(zeros)); for (i = 0; i < nr_iters; i++) { now = time(NULL); - err = bpf_prog_load(file, BPF_PROG_TYPE_SOCKET_FILTER, + err = bpf_prog_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT, &objs[i], &prog_fds[i]); /* test_obj_id.o is a dumb prog. It should never fail * to load. @@ -60,6 +65,17 @@ void test_bpf_obj_id(void) if (CHECK_FAIL(err)) goto done; + prog = bpf_object__find_program_by_title(objs[i], + "raw_tp/sys_enter"); + if (CHECK_FAIL(!prog)) + goto done; + links[i] = bpf_program__attach(prog); + err = libbpf_get_error(links[i]); + if (CHECK(err, "prog_attach", "prog #%d, err %d\n", i, err)) { + links[i] = NULL; + goto done; + } + /* Check getting map info */ info_len = sizeof(struct bpf_map_info) * 2; bzero(&map_infos[i], info_len); @@ -107,7 +123,7 @@ void test_bpf_obj_id(void) load_time = (real_time_ts.tv_sec - boot_time_ts.tv_sec) + (prog_infos[i].load_time / nsec_per_sec); if (CHECK(err || - prog_infos[i].type != BPF_PROG_TYPE_SOCKET_FILTER || + prog_infos[i].type != BPF_PROG_TYPE_RAW_TRACEPOINT || info_len != sizeof(struct bpf_prog_info) || (env.jit_enabled && !prog_infos[i].jited_prog_len) || (env.jit_enabled && @@ -120,7 +136,11 @@ void test_bpf_obj_id(void) *(int *)(long)prog_infos[i].map_ids != map_infos[i].id || strcmp((char *)prog_infos[i].name, expected_prog_name), "get-prog-info(fd)", - "err %d errno %d i %d type %d(%d) info_len %u(%zu) jit_enabled %d jited_prog_len %u xlated_prog_len %u jited_prog %d xlated_prog %d load_time %lu(%lu) uid %u(%u) nr_map_ids %u(%u) map_id %u(%u) name %s(%s)\n", + "err %d errno %d i %d type %d(%d) info_len %u(%zu) " + "jit_enabled %d jited_prog_len %u xlated_prog_len %u " + "jited_prog %d xlated_prog %d load_time %lu(%lu) " + "uid %u(%u) nr_map_ids %u(%u) map_id %u(%u) " + "name %s(%s)\n", err, errno, i, prog_infos[i].type, BPF_PROG_TYPE_SOCKET_FILTER, info_len, sizeof(struct bpf_prog_info), @@ -135,6 +155,33 @@ void test_bpf_obj_id(void) *(int *)(long)prog_infos[i].map_ids, map_infos[i].id, prog_infos[i].name, expected_prog_name)) goto done; + + /* Check getting link info */ + info_len = sizeof(struct bpf_link_info) * 2; + bzero(&link_infos[i], info_len); + link_infos[i].raw_tracepoint.tp_name = (__u64)&tp_name; + link_infos[i].raw_tracepoint.tp_name_len = sizeof(tp_name); + err = bpf_obj_get_info_by_fd(bpf_link__fd(links[i]), + &link_infos[i], &info_len); + if (CHECK(err || + link_infos[i].type != BPF_LINK_TYPE_RAW_TRACEPOINT || + link_infos[i].prog_id != prog_infos[i].id || + link_infos[i].raw_tracepoint.tp_name != (__u64)&tp_name || + strcmp((char *)link_infos[i].raw_tracepoint.tp_name, + "sys_enter") || + info_len != sizeof(struct bpf_link_info), + "get-link-info(fd)", + "err %d errno %d info_len %u(%zu) type %d(%d) id %d " + "prog_id %d (%d) tp_name %s(%s)\n", + err, errno, + info_len, sizeof(struct bpf_link_info), + link_infos[i].type, BPF_LINK_TYPE_RAW_TRACEPOINT, + link_infos[i].id, + link_infos[i].prog_id, prog_infos[i].id, + (char *)link_infos[i].raw_tracepoint.tp_name, + "sys_enter")) + goto done; + } /* Check bpf_prog_get_next_id() */ @@ -247,7 +294,52 @@ void test_bpf_obj_id(void) "nr_id_found %u(%u)\n", nr_id_found, nr_iters); + /* Check bpf_link_get_next_id() */ + nr_id_found = 0; + next_id = 0; + while (!bpf_link_get_next_id(next_id, &next_id)) { + struct bpf_link_info link_info; + int link_fd, cmp_res; + + info_len = sizeof(link_info); + memset(&link_info, 0, info_len); + + link_fd = bpf_link_get_fd_by_id(next_id); + if (link_fd < 0 && errno == ENOENT) + /* The bpf_link is in the dead row */ + continue; + if (CHECK(link_fd < 0, "get-link-fd(next_id)", + "link_fd %d next_id %u errno %d\n", + link_fd, next_id, errno)) + break; + + for (i = 0; i < nr_iters; i++) + if (link_infos[i].id == next_id) + break; + + if (i == nr_iters) + continue; + + nr_id_found++; + + err = bpf_obj_get_info_by_fd(link_fd, &link_info, &info_len); + cmp_res = memcmp(&link_info, &link_infos[i], + offsetof(struct bpf_link_info, raw_tracepoint)); + CHECK(err || info_len != sizeof(link_info) || cmp_res, + "check get-link-info(next_id->fd)", + "err %d errno %d info_len %u(%zu) memcmp %d\n", + err, errno, info_len, sizeof(struct bpf_link_info), + cmp_res); + + close(link_fd); + } + CHECK(nr_id_found != nr_iters, + "check total link id found by get_next_id", + "nr_id_found %u(%u)\n", nr_id_found, nr_iters); + done: - for (i = 0; i < nr_iters; i++) + for (i = 0; i < nr_iters; i++) { + bpf_link__destroy(links[i]); bpf_object__close(objs[i]); + } } -- cgit