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
22static __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
30static __u64 start_time;
31static __u64 cnt;
32
33#define MAX_CNT 100000ll
34
35static 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
57int 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}