samples/bpf/ibumad_user.c

   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
  30 static 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
  45 static 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
  53 static void dump_exit(int sig)
  54 {
  55         dump_all_counts();
  56         exit(0);
  57 }
  58
  59 static const struct option long_options[] = {
  60         {"help",      no_argument,       NULL, 'h'},
  61         {"delay",     required_argument, NULL, 'd'},
  62 };
  63
  64 static 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
  74 int 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 }