LXR linux/samples/bpf/ibumad

   1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2
   3/**
   4 * ibumad BPF sample user side
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of version 2 of the GNU General Public
   8 * License as published by the Free Software Foundation.
   9 *
  10 * Copyright(c) 2018 Ira Weiny, Intel Corporation
  11 */
  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 <sys/resource.h>
  23#include <getopt.h>
  24#include <net/if.h>
  25
  26#include "bpf_load.h"
  27#include "bpf_util.h"
  28#include <bpf/libbpf.h>
  29
  30static void dump_counts(int fd)
  31{
  32        __u32 key;
  33        __u64 value;
  34
  35        for (key = 0; key < 256; key++) {
  36                if (bpf_map_lookup_elem(fd, &key, &value)) {
  37                        printf("failed to read key %u\n", key);
  38                        continue;
  39                }
  40                if (value)
  41                        printf("0x%02x : %llu\n", key, value);
  42        }
  43}
  44
  45static void dump_all_counts(void)
  46{
  47        printf("Read 'Class : count'\n");
  48        dump_counts(map_fd[0]);
  49        printf("Write 'Class : count'\n");
  50        dump_counts(map_fd[1]);
  51}
  52
  53static void dump_exit(int sig)
  54{
  55        dump_all_counts();
  56        exit(0);
  57}
  58
  59static const struct option long_options[] = {
  60        {"help",      no_argument,       NULL, 'h'},
  61        {"delay",     required_argument, NULL, 'd'},
  62};
  63
  64static void usage(char *cmd)
  65{
  66        printf("eBPF test program to count packets from various IP addresses\n"
  67                "Usage: %s <options>\n"
  68                "       --help,   -h  this menu\n"
  69                "       --delay,  -d  <delay>  wait <delay> sec between prints [1 - 1000000]\n"
  70                , cmd
  71                );
  72}
  73
  74int main(int argc, char **argv)
  75{
  76        unsigned long delay = 5;
  77        int longindex = 0;
  78        int opt;
  79        char bpf_file[256];
  80
  81        /* Create the eBPF kernel code path name.
  82         * This follows the pattern of all of the other bpf samples
  83         */
  84        snprintf(bpf_file, sizeof(bpf_file), "%s_kern.o", argv[0]);
  85
  86        /* Do one final dump when exiting */
  87        signal(SIGINT, dump_exit);
  88        signal(SIGTERM, dump_exit);
  89
  90        while ((opt = getopt_long(argc, argv, "hd:rSw",
  91                                  long_options, &longindex)) != -1) {
  92                switch (opt) {
  93                case 'd':
  94                        delay = strtoul(optarg, NULL, 0);
  95                        if (delay == ULONG_MAX || delay < 0 ||
  96                            delay > 1000000) {
  97                                fprintf(stderr, "ERROR: invalid delay : %s\n",
  98                                        optarg);
  99                                usage(argv[0]);
 100                                return 1;
 101                        }
 102                        break;
 103                default:
 104                case 'h':
 105                        usage(argv[0]);
 106                        return 1;
 107                }
 108        }
 109
 110        if (load_bpf_file(bpf_file)) {
 111                fprintf(stderr, "ERROR: failed to load eBPF from file : %s\n",
 112                        bpf_file);
 113                return 1;
 114        }
 115
 116        while (1) {
 117                sleep(delay);
 118                dump_all_counts();
 119        }
 120
 121        return 0;
 122}
 123