GNU Linux-libre 6.6.15-gnu
[releases.git] / 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 <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 }