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- // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
- /*
- * ibumad BPF sample user side
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * Copyright(c) 2018 Ira Weiny, Intel Corporation
- */
- #include <linux/bpf.h>
- #include <signal.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <sys/types.h>
- #include <limits.h>
- #include <getopt.h>
- #include <net/if.h>
- #include <bpf/bpf.h>
- #include "bpf_util.h"
- #include <bpf/libbpf.h>
- static struct bpf_link *tp_links[3];
- static struct bpf_object *obj;
- static int map_fd[2];
- static int tp_cnt;
- static void dump_counts(int fd)
- {
- __u32 key;
- __u64 value;
- for (key = 0; key < 256; key++) {
- if (bpf_map_lookup_elem(fd, &key, &value)) {
- printf("failed to read key %u\n", key);
- continue;
- }
- if (value)
- printf("0x%02x : %llu\n", key, value);
- }
- }
- static void dump_all_counts(void)
- {
- printf("Read 'Class : count'\n");
- dump_counts(map_fd[0]);
- printf("Write 'Class : count'\n");
- dump_counts(map_fd[1]);
- }
- static void dump_exit(int sig)
- {
- dump_all_counts();
- /* Detach tracepoints */
- while (tp_cnt)
- bpf_link__destroy(tp_links[--tp_cnt]);
- bpf_object__close(obj);
- exit(0);
- }
- static const struct option long_options[] = {
- {"help", no_argument, NULL, 'h'},
- {"delay", required_argument, NULL, 'd'},
- };
- static void usage(char *cmd)
- {
- printf("eBPF test program to count packets from various IP addresses\n"
- "Usage: %s <options>\n"
- " --help, -h this menu\n"
- " --delay, -d <delay> wait <delay> sec between prints [1 - 1000000]\n"
- , cmd
- );
- }
- int main(int argc, char **argv)
- {
- struct bpf_program *prog;
- unsigned long delay = 5;
- char filename[256];
- int longindex = 0;
- int opt, err = -1;
- while ((opt = getopt_long(argc, argv, "hd:rSw",
- long_options, &longindex)) != -1) {
- switch (opt) {
- case 'd':
- delay = strtoul(optarg, NULL, 0);
- if (delay == ULONG_MAX || delay < 0 ||
- delay > 1000000) {
- fprintf(stderr, "ERROR: invalid delay : %s\n",
- optarg);
- usage(argv[0]);
- return 1;
- }
- break;
- default:
- case 'h':
- usage(argv[0]);
- return 1;
- }
- }
- /* Do one final dump when exiting */
- signal(SIGINT, dump_exit);
- signal(SIGTERM, dump_exit);
- snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
- obj = bpf_object__open_file(filename, NULL);
- if (libbpf_get_error(obj)) {
- fprintf(stderr, "ERROR: opening BPF object file failed\n");
- return err;
- }
- /* load BPF program */
- if (bpf_object__load(obj)) {
- fprintf(stderr, "ERROR: loading BPF object file failed\n");
- goto cleanup;
- }
- map_fd[0] = bpf_object__find_map_fd_by_name(obj, "read_count");
- map_fd[1] = bpf_object__find_map_fd_by_name(obj, "write_count");
- if (map_fd[0] < 0 || map_fd[1] < 0) {
- fprintf(stderr, "ERROR: finding a map in obj file failed\n");
- goto cleanup;
- }
- bpf_object__for_each_program(prog, obj) {
- tp_links[tp_cnt] = bpf_program__attach(prog);
- if (libbpf_get_error(tp_links[tp_cnt])) {
- fprintf(stderr, "ERROR: bpf_program__attach failed\n");
- tp_links[tp_cnt] = NULL;
- goto cleanup;
- }
- tp_cnt++;
- }
- while (1) {
- sleep(delay);
- dump_all_counts();
- }
- err = 0;
- cleanup:
- /* Detach tracepoints */
- while (tp_cnt)
- bpf_link__destroy(tp_links[--tp_cnt]);
- bpf_object__close(obj);
- return err;
- }
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