125763b3cSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21da236b6SYonghong Song /* Copyright (c) 2017 Facebook 31da236b6SYonghong Song */ 41da236b6SYonghong Song #include <stdio.h> 51da236b6SYonghong Song #include <unistd.h> 61da236b6SYonghong Song #include <fcntl.h> 71da236b6SYonghong Song #include <stdlib.h> 81da236b6SYonghong Song #include <string.h> 91da236b6SYonghong Song #include <linux/perf_event.h> 101da236b6SYonghong Song #include <errno.h> 11f0c328f8SDaniel T. Lee #include <bpf/libbpf.h> 122bf3e2efSJakub Kicinski #include <bpf/bpf.h> 131da236b6SYonghong Song 141da236b6SYonghong Song /* This program verifies bpf attachment to tracepoint sys_enter_* and sys_exit_*. 151da236b6SYonghong Song * This requires kernel CONFIG_FTRACE_SYSCALLS to be set. 161da236b6SYonghong Song */ 171da236b6SYonghong Song 18a678be5cSYonghong Song static void usage(const char *cmd) 19a678be5cSYonghong Song { 20*948189f6SJinghao Jia printf("USAGE: %s [-i nr_tests] [-h]\n", cmd); 21*948189f6SJinghao Jia printf(" -i nr_tests # rounds of test to run\n"); 22a678be5cSYonghong Song printf(" -h # help\n"); 23a678be5cSYonghong Song } 24a678be5cSYonghong Song 251da236b6SYonghong Song static void verify_map(int map_id) 261da236b6SYonghong Song { 271da236b6SYonghong Song __u32 key = 0; 281da236b6SYonghong Song __u32 val; 291da236b6SYonghong Song 301da236b6SYonghong Song if (bpf_map_lookup_elem(map_id, &key, &val) != 0) { 311da236b6SYonghong Song fprintf(stderr, "map_lookup failed: %s\n", strerror(errno)); 321da236b6SYonghong Song return; 331da236b6SYonghong Song } 34a678be5cSYonghong Song if (val == 0) { 351da236b6SYonghong Song fprintf(stderr, "failed: map #%d returns value 0\n", map_id); 36a678be5cSYonghong Song return; 37a678be5cSYonghong Song } 3835f91d1fSSong Chen 3935f91d1fSSong Chen printf("verify map:%d val: %d\n", map_id, val); 4035f91d1fSSong Chen 41a678be5cSYonghong Song val = 0; 42a678be5cSYonghong Song if (bpf_map_update_elem(map_id, &key, &val, BPF_ANY) != 0) { 43a678be5cSYonghong Song fprintf(stderr, "map_update failed: %s\n", strerror(errno)); 44a678be5cSYonghong Song return; 45a678be5cSYonghong Song } 461da236b6SYonghong Song } 471da236b6SYonghong Song 48*948189f6SJinghao Jia static int test(char *filename, int nr_tests) 491da236b6SYonghong Song { 50*948189f6SJinghao Jia int map0_fds[nr_tests], map1_fds[nr_tests], fd, i, j = 0; 51*948189f6SJinghao Jia struct bpf_link *links[nr_tests * 4]; 52*948189f6SJinghao Jia struct bpf_object *objs[nr_tests]; 53f0c328f8SDaniel T. Lee struct bpf_program *prog; 541da236b6SYonghong Song 55*948189f6SJinghao Jia for (i = 0; i < nr_tests; i++) { 56f0c328f8SDaniel T. Lee objs[i] = bpf_object__open_file(filename, NULL); 57f0c328f8SDaniel T. Lee if (libbpf_get_error(objs[i])) { 58f0c328f8SDaniel T. Lee fprintf(stderr, "opening BPF object file failed\n"); 59f0c328f8SDaniel T. Lee objs[i] = NULL; 60f0c328f8SDaniel T. Lee goto cleanup; 611da236b6SYonghong Song } 62f0c328f8SDaniel T. Lee 63f0c328f8SDaniel T. Lee /* load BPF program */ 64f0c328f8SDaniel T. Lee if (bpf_object__load(objs[i])) { 65f0c328f8SDaniel T. Lee fprintf(stderr, "loading BPF object file failed\n"); 66f0c328f8SDaniel T. Lee goto cleanup; 67f0c328f8SDaniel T. Lee } 68f0c328f8SDaniel T. Lee 69f0c328f8SDaniel T. Lee map0_fds[i] = bpf_object__find_map_fd_by_name(objs[i], 70f0c328f8SDaniel T. Lee "enter_open_map"); 71f0c328f8SDaniel T. Lee map1_fds[i] = bpf_object__find_map_fd_by_name(objs[i], 72f0c328f8SDaniel T. Lee "exit_open_map"); 73f0c328f8SDaniel T. Lee if (map0_fds[i] < 0 || map1_fds[i] < 0) { 74f0c328f8SDaniel T. Lee fprintf(stderr, "finding a map in obj file failed\n"); 75f0c328f8SDaniel T. Lee goto cleanup; 76f0c328f8SDaniel T. Lee } 77f0c328f8SDaniel T. Lee 78f0c328f8SDaniel T. Lee bpf_object__for_each_program(prog, objs[i]) { 79f0c328f8SDaniel T. Lee links[j] = bpf_program__attach(prog); 80f0c328f8SDaniel T. Lee if (libbpf_get_error(links[j])) { 81f0c328f8SDaniel T. Lee fprintf(stderr, "bpf_program__attach failed\n"); 82f0c328f8SDaniel T. Lee links[j] = NULL; 83f0c328f8SDaniel T. Lee goto cleanup; 84f0c328f8SDaniel T. Lee } 85f0c328f8SDaniel T. Lee j++; 86f0c328f8SDaniel T. Lee } 87f0c328f8SDaniel T. Lee printf("prog #%d: map ids %d %d\n", i, map0_fds[i], map1_fds[i]); 88a678be5cSYonghong Song } 891da236b6SYonghong Song 901da236b6SYonghong Song /* current load_bpf_file has perf_event_open default pid = -1 911da236b6SYonghong Song * and cpu = 0, which permits attached bpf execution on 921da236b6SYonghong Song * all cpus for all pid's. bpf program execution ignores 931da236b6SYonghong Song * cpu affinity. 941da236b6SYonghong Song */ 951da236b6SYonghong Song /* trigger some "open" operations */ 961da236b6SYonghong Song fd = open(filename, O_RDONLY); 971da236b6SYonghong Song if (fd < 0) { 981da236b6SYonghong Song fprintf(stderr, "open failed: %s\n", strerror(errno)); 991da236b6SYonghong Song return 1; 1001da236b6SYonghong Song } 1011da236b6SYonghong Song close(fd); 1021da236b6SYonghong Song 1031da236b6SYonghong Song /* verify the map */ 104*948189f6SJinghao Jia for (i = 0; i < nr_tests; i++) { 105a678be5cSYonghong Song verify_map(map0_fds[i]); 106a678be5cSYonghong Song verify_map(map1_fds[i]); 107a678be5cSYonghong Song } 1081da236b6SYonghong Song 109f0c328f8SDaniel T. Lee cleanup: 110f0c328f8SDaniel T. Lee for (j--; j >= 0; j--) 111f0c328f8SDaniel T. Lee bpf_link__destroy(links[j]); 112f0c328f8SDaniel T. Lee 113f0c328f8SDaniel T. Lee for (i--; i >= 0; i--) 114f0c328f8SDaniel T. Lee bpf_object__close(objs[i]); 1151da236b6SYonghong Song return 0; 1161da236b6SYonghong Song } 117a678be5cSYonghong Song 118a678be5cSYonghong Song int main(int argc, char **argv) 119a678be5cSYonghong Song { 120*948189f6SJinghao Jia int opt, nr_tests = 1; 121a678be5cSYonghong Song char filename[256]; 122a678be5cSYonghong Song 123a678be5cSYonghong Song while ((opt = getopt(argc, argv, "i:h")) != -1) { 124a678be5cSYonghong Song switch (opt) { 125a678be5cSYonghong Song case 'i': 126*948189f6SJinghao Jia nr_tests = atoi(optarg); 127a678be5cSYonghong Song break; 128a678be5cSYonghong Song case 'h': 129a678be5cSYonghong Song default: 130a678be5cSYonghong Song usage(argv[0]); 131a678be5cSYonghong Song return 0; 132a678be5cSYonghong Song } 133a678be5cSYonghong Song } 134a678be5cSYonghong Song 135a678be5cSYonghong Song snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 136a678be5cSYonghong Song 137*948189f6SJinghao Jia return test(filename, nr_tests); 138a678be5cSYonghong Song } 139