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0ac01feb IW |
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 | ||
763af200 | 26 | #include <bpf/bpf.h> |
0ac01feb | 27 | #include "bpf_util.h" |
7cf245a3 | 28 | #include <bpf/libbpf.h> |
0ac01feb | 29 | |
763af200 DL |
30 | static struct bpf_link *tp_links[3]; |
31 | static struct bpf_object *obj; | |
32 | static int map_fd[2]; | |
33 | static int tp_cnt; | |
34 | ||
0ac01feb IW |
35 | static void dump_counts(int fd) |
36 | { | |
37 | __u32 key; | |
38 | __u64 value; | |
39 | ||
40 | for (key = 0; key < 256; key++) { | |
41 | if (bpf_map_lookup_elem(fd, &key, &value)) { | |
42 | printf("failed to read key %u\n", key); | |
43 | continue; | |
44 | } | |
45 | if (value) | |
46 | printf("0x%02x : %llu\n", key, value); | |
47 | } | |
48 | } | |
49 | ||
50 | static void dump_all_counts(void) | |
51 | { | |
52 | printf("Read 'Class : count'\n"); | |
53 | dump_counts(map_fd[0]); | |
54 | printf("Write 'Class : count'\n"); | |
55 | dump_counts(map_fd[1]); | |
56 | } | |
57 | ||
58 | static void dump_exit(int sig) | |
59 | { | |
60 | dump_all_counts(); | |
763af200 DL |
61 | /* Detach tracepoints */ |
62 | while (tp_cnt) | |
63 | bpf_link__destroy(tp_links[--tp_cnt]); | |
64 | ||
65 | bpf_object__close(obj); | |
0ac01feb IW |
66 | exit(0); |
67 | } | |
68 | ||
69 | static const struct option long_options[] = { | |
70 | {"help", no_argument, NULL, 'h'}, | |
71 | {"delay", required_argument, NULL, 'd'}, | |
72 | }; | |
73 | ||
74 | static void usage(char *cmd) | |
75 | { | |
76 | printf("eBPF test program to count packets from various IP addresses\n" | |
77 | "Usage: %s <options>\n" | |
78 | " --help, -h this menu\n" | |
79 | " --delay, -d <delay> wait <delay> sec between prints [1 - 1000000]\n" | |
80 | , cmd | |
81 | ); | |
82 | } | |
83 | ||
84 | int main(int argc, char **argv) | |
85 | { | |
763af200 | 86 | struct bpf_program *prog; |
0ac01feb | 87 | unsigned long delay = 5; |
763af200 | 88 | char filename[256]; |
0ac01feb | 89 | int longindex = 0; |
763af200 | 90 | int opt, err = -1; |
0ac01feb IW |
91 | |
92 | while ((opt = getopt_long(argc, argv, "hd:rSw", | |
93 | long_options, &longindex)) != -1) { | |
94 | switch (opt) { | |
95 | case 'd': | |
96 | delay = strtoul(optarg, NULL, 0); | |
97 | if (delay == ULONG_MAX || delay < 0 || | |
98 | delay > 1000000) { | |
99 | fprintf(stderr, "ERROR: invalid delay : %s\n", | |
100 | optarg); | |
101 | usage(argv[0]); | |
102 | return 1; | |
103 | } | |
104 | break; | |
105 | default: | |
106 | case 'h': | |
107 | usage(argv[0]); | |
108 | return 1; | |
109 | } | |
110 | } | |
111 | ||
763af200 DL |
112 | /* Do one final dump when exiting */ |
113 | signal(SIGINT, dump_exit); | |
114 | signal(SIGTERM, dump_exit); | |
115 | ||
116 | snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); | |
117 | obj = bpf_object__open_file(filename, NULL); | |
118 | if (libbpf_get_error(obj)) { | |
119 | fprintf(stderr, "ERROR: opening BPF object file failed\n"); | |
120 | return err; | |
121 | } | |
122 | ||
123 | /* load BPF program */ | |
124 | if (bpf_object__load(obj)) { | |
125 | fprintf(stderr, "ERROR: loading BPF object file failed\n"); | |
126 | goto cleanup; | |
127 | } | |
128 | ||
129 | map_fd[0] = bpf_object__find_map_fd_by_name(obj, "read_count"); | |
130 | map_fd[1] = bpf_object__find_map_fd_by_name(obj, "write_count"); | |
131 | if (map_fd[0] < 0 || map_fd[1] < 0) { | |
132 | fprintf(stderr, "ERROR: finding a map in obj file failed\n"); | |
133 | goto cleanup; | |
134 | } | |
135 | ||
136 | bpf_object__for_each_program(prog, obj) { | |
137 | tp_links[tp_cnt] = bpf_program__attach(prog); | |
138 | if (libbpf_get_error(tp_links[tp_cnt])) { | |
139 | fprintf(stderr, "ERROR: bpf_program__attach failed\n"); | |
140 | tp_links[tp_cnt] = NULL; | |
141 | goto cleanup; | |
142 | } | |
143 | tp_cnt++; | |
0ac01feb IW |
144 | } |
145 | ||
146 | while (1) { | |
147 | sleep(delay); | |
148 | dump_all_counts(); | |
149 | } | |
763af200 DL |
150 | err = 0; |
151 | ||
152 | cleanup: | |
153 | /* Detach tracepoints */ | |
154 | while (tp_cnt) | |
155 | bpf_link__destroy(tp_links[--tp_cnt]); | |
0ac01feb | 156 | |
763af200 DL |
157 | bpf_object__close(obj); |
158 | return err; | |
0ac01feb | 159 | } |