1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <stdio.h> 2 #include <stdio.h>
3 #include <fcntl.h> 3 #include <fcntl.h>
4 #include <poll.h> 4 #include <poll.h>
5 #include <time.h> 5 #include <time.h>
6 #include <signal.h> 6 #include <signal.h>
7 #include <bpf/libbpf.h> 7 #include <bpf/libbpf.h>
8 8
9 static __u64 time_get_ns(void) 9 static __u64 time_get_ns(void)
10 { 10 {
11 struct timespec ts; 11 struct timespec ts;
12 12
13 clock_gettime(CLOCK_MONOTONIC, &ts); 13 clock_gettime(CLOCK_MONOTONIC, &ts);
14 return ts.tv_sec * 1000000000ull + ts. 14 return ts.tv_sec * 1000000000ull + ts.tv_nsec;
15 } 15 }
16 16
17 static __u64 start_time; 17 static __u64 start_time;
18 static __u64 cnt; 18 static __u64 cnt;
19 19
20 #define MAX_CNT 100000ll 20 #define MAX_CNT 100000ll
21 21
22 static void print_bpf_output(void *ctx, int cp 22 static void print_bpf_output(void *ctx, int cpu, void *data, __u32 size)
23 { 23 {
24 struct { 24 struct {
25 __u64 pid; 25 __u64 pid;
26 __u64 cookie; 26 __u64 cookie;
27 } *e = data; 27 } *e = data;
28 28
29 if (e->cookie != 0x12345678) { 29 if (e->cookie != 0x12345678) {
30 printf("BUG pid %llx cookie %l 30 printf("BUG pid %llx cookie %llx sized %d\n",
31 e->pid, e->cookie, size 31 e->pid, e->cookie, size);
32 return; 32 return;
33 } 33 }
34 34
35 cnt++; 35 cnt++;
36 36
37 if (cnt == MAX_CNT) { 37 if (cnt == MAX_CNT) {
38 printf("recv %lld events per s 38 printf("recv %lld events per sec\n",
39 MAX_CNT * 1000000000ll 39 MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
40 return; 40 return;
41 } 41 }
42 } 42 }
43 43
44 int main(int argc, char **argv) 44 int main(int argc, char **argv)
45 { 45 {
46 struct bpf_link *link = NULL; 46 struct bpf_link *link = NULL;
47 struct bpf_program *prog; 47 struct bpf_program *prog;
48 struct perf_buffer *pb; 48 struct perf_buffer *pb;
49 struct bpf_object *obj; 49 struct bpf_object *obj;
50 int map_fd, ret = 0; 50 int map_fd, ret = 0;
51 char filename[256]; 51 char filename[256];
52 FILE *f; 52 FILE *f;
53 53
54 snprintf(filename, sizeof(filename), " 54 snprintf(filename, sizeof(filename), "%s.bpf.o", argv[0]);
55 obj = bpf_object__open_file(filename, 55 obj = bpf_object__open_file(filename, NULL);
56 if (libbpf_get_error(obj)) { 56 if (libbpf_get_error(obj)) {
57 fprintf(stderr, "ERROR: openin 57 fprintf(stderr, "ERROR: opening BPF object file failed\n");
58 return 0; 58 return 0;
59 } 59 }
60 60
61 /* load BPF program */ 61 /* load BPF program */
62 if (bpf_object__load(obj)) { 62 if (bpf_object__load(obj)) {
63 fprintf(stderr, "ERROR: loadin 63 fprintf(stderr, "ERROR: loading BPF object file failed\n");
64 goto cleanup; 64 goto cleanup;
65 } 65 }
66 66
67 map_fd = bpf_object__find_map_fd_by_na 67 map_fd = bpf_object__find_map_fd_by_name(obj, "my_map");
68 if (map_fd < 0) { 68 if (map_fd < 0) {
69 fprintf(stderr, "ERROR: findin 69 fprintf(stderr, "ERROR: finding a map in obj file failed\n");
70 goto cleanup; 70 goto cleanup;
71 } 71 }
72 72
73 prog = bpf_object__find_program_by_nam 73 prog = bpf_object__find_program_by_name(obj, "bpf_prog1");
74 if (libbpf_get_error(prog)) { 74 if (libbpf_get_error(prog)) {
75 fprintf(stderr, "ERROR: findin 75 fprintf(stderr, "ERROR: finding a prog in obj file failed\n");
76 goto cleanup; 76 goto cleanup;
77 } 77 }
78 78
79 link = bpf_program__attach(prog); 79 link = bpf_program__attach(prog);
80 if (libbpf_get_error(link)) { 80 if (libbpf_get_error(link)) {
81 fprintf(stderr, "ERROR: bpf_pr 81 fprintf(stderr, "ERROR: bpf_program__attach failed\n");
82 link = NULL; 82 link = NULL;
83 goto cleanup; 83 goto cleanup;
84 } 84 }
85 85
86 pb = perf_buffer__new(map_fd, 8, print 86 pb = perf_buffer__new(map_fd, 8, print_bpf_output, NULL, NULL, NULL);
87 ret = libbpf_get_error(pb); 87 ret = libbpf_get_error(pb);
88 if (ret) { 88 if (ret) {
89 printf("failed to setup perf_b 89 printf("failed to setup perf_buffer: %d\n", ret);
90 return 1; 90 return 1;
91 } 91 }
92 92
93 f = popen("taskset 1 dd if=/dev/zero o 93 f = popen("taskset 1 dd if=/dev/zero of=/dev/null", "r");
94 (void) f; 94 (void) f;
95 95
96 start_time = time_get_ns(); 96 start_time = time_get_ns();
97 while ((ret = perf_buffer__poll(pb, 10 97 while ((ret = perf_buffer__poll(pb, 1000)) >= 0 && cnt < MAX_CNT) {
98 } 98 }
99 kill(0, SIGINT); 99 kill(0, SIGINT);
100 100
101 cleanup: 101 cleanup:
102 bpf_link__destroy(link); 102 bpf_link__destroy(link);
103 bpf_object__close(obj); 103 bpf_object__close(obj);
104 return ret; 104 return ret;
105 } 105 }
106 106
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