159 lines · c
1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB2 3/*4 * ibumad BPF sample user side5 *6 * This program is free software; you can redistribute it and/or7 * modify it under the terms of version 2 of the GNU General Public8 * License as published by the Free Software Foundation.9 *10 * Copyright(c) 2018 Ira Weiny, Intel Corporation11 */12 13#include <linux/bpf.h>14#include <signal.h>15#include <stdio.h>16#include <stdlib.h>17#include <string.h>18#include <unistd.h>19#include <sys/types.h>20#include <limits.h>21 22#include <getopt.h>23#include <net/if.h>24 25#include <bpf/bpf.h>26#include "bpf_util.h"27#include <bpf/libbpf.h>28 29static struct bpf_link *tp_links[3];30static struct bpf_object *obj;31static int map_fd[2];32static int tp_cnt;33 34static void dump_counts(int fd)35{36 __u32 key;37 __u64 value;38 39 for (key = 0; key < 256; key++) {40 if (bpf_map_lookup_elem(fd, &key, &value)) {41 printf("failed to read key %u\n", key);42 continue;43 }44 if (value)45 printf("0x%02x : %llu\n", key, value);46 }47}48 49static void dump_all_counts(void)50{51 printf("Read 'Class : count'\n");52 dump_counts(map_fd[0]);53 printf("Write 'Class : count'\n");54 dump_counts(map_fd[1]);55}56 57static void dump_exit(int sig)58{59 dump_all_counts();60 /* Detach tracepoints */61 while (tp_cnt)62 bpf_link__destroy(tp_links[--tp_cnt]);63 64 bpf_object__close(obj);65 exit(0);66}67 68static const struct option long_options[] = {69 {"help", no_argument, NULL, 'h'},70 {"delay", required_argument, NULL, 'd'},71};72 73static void usage(char *cmd)74{75 printf("eBPF test program to count packets from various IP addresses\n"76 "Usage: %s <options>\n"77 " --help, -h this menu\n"78 " --delay, -d <delay> wait <delay> sec between prints [1 - 1000000]\n"79 , cmd80 );81}82 83int main(int argc, char **argv)84{85 struct bpf_program *prog;86 unsigned long delay = 5;87 char filename[256];88 int longindex = 0;89 int opt, err = -1;90 91 while ((opt = getopt_long(argc, argv, "hd:rSw",92 long_options, &longindex)) != -1) {93 switch (opt) {94 case 'd':95 delay = strtoul(optarg, NULL, 0);96 if (delay == ULONG_MAX || delay < 0 ||97 delay > 1000000) {98 fprintf(stderr, "ERROR: invalid delay : %s\n",99 optarg);100 usage(argv[0]);101 return 1;102 }103 break;104 default:105 case 'h':106 usage(argv[0]);107 return 1;108 }109 }110 111 /* Do one final dump when exiting */112 signal(SIGINT, dump_exit);113 signal(SIGTERM, dump_exit);114 115 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);116 obj = bpf_object__open_file(filename, NULL);117 if (libbpf_get_error(obj)) {118 fprintf(stderr, "ERROR: opening BPF object file failed\n");119 return err;120 }121 122 /* load BPF program */123 if (bpf_object__load(obj)) {124 fprintf(stderr, "ERROR: loading BPF object file failed\n");125 goto cleanup;126 }127 128 map_fd[0] = bpf_object__find_map_fd_by_name(obj, "read_count");129 map_fd[1] = bpf_object__find_map_fd_by_name(obj, "write_count");130 if (map_fd[0] < 0 || map_fd[1] < 0) {131 fprintf(stderr, "ERROR: finding a map in obj file failed\n");132 goto cleanup;133 }134 135 bpf_object__for_each_program(prog, obj) {136 tp_links[tp_cnt] = bpf_program__attach(prog);137 if (libbpf_get_error(tp_links[tp_cnt])) {138 fprintf(stderr, "ERROR: bpf_program__attach failed\n");139 tp_links[tp_cnt] = NULL;140 goto cleanup;141 }142 tp_cnt++;143 }144 145 while (1) {146 sleep(delay);147 dump_all_counts();148 }149 err = 0;150 151cleanup:152 /* Detach tracepoints */153 while (tp_cnt)154 bpf_link__destroy(tp_links[--tp_cnt]);155 156 bpf_object__close(obj);157 return err;158}159