1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <linux/bpf.h>
 4#include <time.h>
 5#include <errno.h>
 6#include <bpf/bpf_helpers.h>
 7#include <bpf/bpf_tracing.h>
 8#include "bpf_misc.h"
 9
10char _license[] SEC("license") = "GPL";
11
12struct elem {
13	struct bpf_timer t;
14};
15
16struct {
17	__uint(type, BPF_MAP_TYPE_ARRAY);
18	__uint(max_entries, 1);
19	__type(key, int);
20	__type(value, struct elem);
21} timer1_map SEC(".maps");
22
23struct {
24	__uint(type, BPF_MAP_TYPE_ARRAY);
25	__uint(max_entries, 1);
26	__type(key, int);
27	__type(value, struct elem);
28} timer2_map SEC(".maps");
29
30int timer1_err;
31int timer2_err;
32
33static int timer_cb1(void *map, int *k, struct elem *v)
34{
35	struct bpf_timer *timer;
36	int key = 0;
37
38	timer = bpf_map_lookup_elem(&timer2_map, &key);
39	if (timer)
40		timer2_err = bpf_timer_cancel(timer);
41
42	return 0;
43}
44
45static int timer_cb2(void *map, int *k, struct elem *v)
46{
47	struct bpf_timer *timer;
48	int key = 0;
49
50	timer = bpf_map_lookup_elem(&timer1_map, &key);
51	if (timer)
52		timer1_err = bpf_timer_cancel(timer);
53
54	return 0;
55}
56
57SEC("tc")
58int timer1_prog(void *ctx)
59{
60	struct bpf_timer *timer;
61	int key = 0;
62
63	timer = bpf_map_lookup_elem(&timer1_map, &key);
64	if (timer) {
65		bpf_timer_init(timer, &timer1_map, CLOCK_BOOTTIME);
66		bpf_timer_set_callback(timer, timer_cb1);
67		bpf_timer_start(timer, 1, BPF_F_TIMER_CPU_PIN);
68	}
69
70	return 0;
71}
72
73SEC("tc")
74int timer2_prog(void *ctx)
75{
76	struct bpf_timer *timer;
77	int key = 0;
78
79	timer = bpf_map_lookup_elem(&timer2_map, &key);
80	if (timer) {
81		bpf_timer_init(timer, &timer2_map, CLOCK_BOOTTIME);
82		bpf_timer_set_callback(timer, timer_cb2);
83		bpf_timer_start(timer, 1, BPF_F_TIMER_CPU_PIN);
84	}
85
86	return 0;
87}