tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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}