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 10 char _license[] SEC("license") = "GPL"; 11 12 struct elem { 13 struct bpf_timer t; 14 }; 15 16 struct { 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 23 struct { 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 30 int timer1_err; 31 int timer2_err; 32 33 static 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 45 static 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 57 SEC("tc") 58 int 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 73 SEC("tc") 74 int 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 } 88