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 <getopt.h>
23 #include <net/if.h>
24
25 #include <bpf/bpf.h>
26 #include "bpf_util.h"
27 #include <bpf/libbpf.h>
28
29 static struct bpf_link *tp_links[3];
30 static struct bpf_object *obj;
31 static int map_fd[2];
32 static int tp_cnt;
33
34 static 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
49 static 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
57 static 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
68 static const struct option long_options[] = {
69 {"help", no_argument, NULL, 'h'},
70 {"delay", required_argument, NULL, 'd'},
71 };
72
73 static 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 , cmd
80 );
81 }
82
83 int 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
151 cleanup:
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
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