1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <stdio.h>
3 #include <unistd.h>
4 #include <stdlib.h>
5 #include <stdbool.h>
6 #include <string.h>
7 #include <fcntl.h>
8 #include <poll.h>
9 #include <linux/perf_event.h>
10 #include <linux/bpf.h>
11 #include <errno.h>
12 #include <assert.h>
13 #include <sys/syscall.h>
14 #include <sys/ioctl.h>
15 #include <sys/mman.h>
16 #include <time.h>
17 #include <signal.h>
18 #include <libbpf.h>
19 #include "bpf_load.h"
20 #include "perf-sys.h"
21 
22 static __u64 time_get_ns(void)
23 {
24 	struct timespec ts;
25 
26 	clock_gettime(CLOCK_MONOTONIC, &ts);
27 	return ts.tv_sec * 1000000000ull + ts.tv_nsec;
28 }
29 
30 static __u64 start_time;
31 static __u64 cnt;
32 
33 #define MAX_CNT 100000ll
34 
35 static void print_bpf_output(void *ctx, int cpu, void *data, __u32 size)
36 {
37 	struct {
38 		__u64 pid;
39 		__u64 cookie;
40 	} *e = data;
41 
42 	if (e->cookie != 0x12345678) {
43 		printf("BUG pid %llx cookie %llx sized %d\n",
44 		       e->pid, e->cookie, size);
45 		return;
46 	}
47 
48 	cnt++;
49 
50 	if (cnt == MAX_CNT) {
51 		printf("recv %lld events per sec\n",
52 		       MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
53 		return;
54 	}
55 }
56 
57 int main(int argc, char **argv)
58 {
59 	struct perf_buffer_opts pb_opts = {};
60 	struct perf_buffer *pb;
61 	char filename[256];
62 	FILE *f;
63 	int ret;
64 
65 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
66 
67 	if (load_bpf_file(filename)) {
68 		printf("%s", bpf_log_buf);
69 		return 1;
70 	}
71 
72 	pb_opts.sample_cb = print_bpf_output;
73 	pb = perf_buffer__new(map_fd[0], 8, &pb_opts);
74 	ret = libbpf_get_error(pb);
75 	if (ret) {
76 		printf("failed to setup perf_buffer: %d\n", ret);
77 		return 1;
78 	}
79 
80 	f = popen("taskset 1 dd if=/dev/zero of=/dev/null", "r");
81 	(void) f;
82 
83 	start_time = time_get_ns();
84 	while ((ret = perf_buffer__poll(pb, 1000)) >= 0 && cnt < MAX_CNT) {
85 	}
86 	kill(0, SIGINT);
87 	return ret;
88 }
89