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 <signal.h> 91da236b6SYonghong Song #include <linux/bpf.h> 101da236b6SYonghong Song #include <string.h> 111da236b6SYonghong Song #include <linux/perf_event.h> 121da236b6SYonghong Song #include <errno.h> 131da236b6SYonghong Song #include <assert.h> 141da236b6SYonghong Song #include <stdbool.h> 151da236b6SYonghong Song #include <sys/resource.h> 162bf3e2efSJakub Kicinski #include <bpf/bpf.h> 171da236b6SYonghong Song #include "bpf_load.h" 181da236b6SYonghong Song 191da236b6SYonghong Song /* This program verifies bpf attachment to tracepoint sys_enter_* and sys_exit_*. 201da236b6SYonghong Song * This requires kernel CONFIG_FTRACE_SYSCALLS to be set. 211da236b6SYonghong Song */ 221da236b6SYonghong Song 23a678be5cSYonghong Song static void usage(const char *cmd) 24a678be5cSYonghong Song { 25a678be5cSYonghong Song printf("USAGE: %s [-i num_progs] [-h]\n", cmd); 26a678be5cSYonghong Song printf(" -i num_progs # number of progs of the test\n"); 27a678be5cSYonghong Song printf(" -h # help\n"); 28a678be5cSYonghong Song } 29a678be5cSYonghong Song 301da236b6SYonghong Song static void verify_map(int map_id) 311da236b6SYonghong Song { 321da236b6SYonghong Song __u32 key = 0; 331da236b6SYonghong Song __u32 val; 341da236b6SYonghong Song 351da236b6SYonghong Song if (bpf_map_lookup_elem(map_id, &key, &val) != 0) { 361da236b6SYonghong Song fprintf(stderr, "map_lookup failed: %s\n", strerror(errno)); 371da236b6SYonghong Song return; 381da236b6SYonghong Song } 39a678be5cSYonghong Song if (val == 0) { 401da236b6SYonghong Song fprintf(stderr, "failed: map #%d returns value 0\n", map_id); 41a678be5cSYonghong Song return; 42a678be5cSYonghong Song } 43a678be5cSYonghong Song val = 0; 44a678be5cSYonghong Song if (bpf_map_update_elem(map_id, &key, &val, BPF_ANY) != 0) { 45a678be5cSYonghong Song fprintf(stderr, "map_update failed: %s\n", strerror(errno)); 46a678be5cSYonghong Song return; 47a678be5cSYonghong Song } 481da236b6SYonghong Song } 491da236b6SYonghong Song 50a678be5cSYonghong Song static int test(char *filename, int num_progs) 511da236b6SYonghong Song { 52a678be5cSYonghong Song int i, fd, map0_fds[num_progs], map1_fds[num_progs]; 531da236b6SYonghong Song 54a678be5cSYonghong Song for (i = 0; i < num_progs; i++) { 551da236b6SYonghong Song if (load_bpf_file(filename)) { 561da236b6SYonghong Song fprintf(stderr, "%s", bpf_log_buf); 571da236b6SYonghong Song return 1; 581da236b6SYonghong Song } 59a678be5cSYonghong Song printf("prog #%d: map ids %d %d\n", i, map_fd[0], map_fd[1]); 60a678be5cSYonghong Song map0_fds[i] = map_fd[0]; 61a678be5cSYonghong Song map1_fds[i] = map_fd[1]; 62a678be5cSYonghong Song } 631da236b6SYonghong Song 641da236b6SYonghong Song /* current load_bpf_file has perf_event_open default pid = -1 651da236b6SYonghong Song * and cpu = 0, which permits attached bpf execution on 661da236b6SYonghong Song * all cpus for all pid's. bpf program execution ignores 671da236b6SYonghong Song * cpu affinity. 681da236b6SYonghong Song */ 691da236b6SYonghong Song /* trigger some "open" operations */ 701da236b6SYonghong Song fd = open(filename, O_RDONLY); 711da236b6SYonghong Song if (fd < 0) { 721da236b6SYonghong Song fprintf(stderr, "open failed: %s\n", strerror(errno)); 731da236b6SYonghong Song return 1; 741da236b6SYonghong Song } 751da236b6SYonghong Song close(fd); 761da236b6SYonghong Song 771da236b6SYonghong Song /* verify the map */ 78a678be5cSYonghong Song for (i = 0; i < num_progs; i++) { 79a678be5cSYonghong Song verify_map(map0_fds[i]); 80a678be5cSYonghong Song verify_map(map1_fds[i]); 81a678be5cSYonghong Song } 821da236b6SYonghong Song 831da236b6SYonghong Song return 0; 841da236b6SYonghong Song } 85a678be5cSYonghong Song 86a678be5cSYonghong Song int main(int argc, char **argv) 87a678be5cSYonghong Song { 88a678be5cSYonghong Song struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; 89a678be5cSYonghong Song int opt, num_progs = 1; 90a678be5cSYonghong Song char filename[256]; 91a678be5cSYonghong Song 92a678be5cSYonghong Song while ((opt = getopt(argc, argv, "i:h")) != -1) { 93a678be5cSYonghong Song switch (opt) { 94a678be5cSYonghong Song case 'i': 95a678be5cSYonghong Song num_progs = atoi(optarg); 96a678be5cSYonghong Song break; 97a678be5cSYonghong Song case 'h': 98a678be5cSYonghong Song default: 99a678be5cSYonghong Song usage(argv[0]); 100a678be5cSYonghong Song return 0; 101a678be5cSYonghong Song } 102a678be5cSYonghong Song } 103a678be5cSYonghong Song 104a678be5cSYonghong Song setrlimit(RLIMIT_MEMLOCK, &r); 105a678be5cSYonghong Song snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 106a678be5cSYonghong Song 107a678be5cSYonghong Song return test(filename, num_progs); 108a678be5cSYonghong Song } 109