tools/testing/selftests/bpf/progs/timer_lockup.c

   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 }