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// SPDX-License-Identifier: GPL-2.0
#include <vmlinux.h>
#include <errno.h>
#include <bpf/bpf_helpers.h>
#define CLOCK_MONOTONIC 1
#define TIMER_NSEC (60ULL * 1000 * 1000 * 1000)
struct timer_value {
struct bpf_timer timer;
u64 data;
};
struct {
__uint(type, BPF_MAP_TYPE_RHASH);
__uint(map_flags, BPF_F_NO_PREALLOC);
__uint(max_entries, 1);
__type(key, u64);
__type(value, struct timer_value);
} timer_map SEC(".maps");
u64 armed;
u64 cancelled;
long timer_init_err;
long timer_set_callback_err;
long timer_start_err;
long timer_cancel_err;
static int timer_cb(void *map, u64 *key, struct timer_value *value)
{
return 0;
}
static long arm_timer_cb(struct bpf_map *map, u64 *key,
struct timer_value *value, void *ctx)
{
u64 key_copy = *key;
long err;
err = bpf_map_delete_elem(map, &key_copy);
if (err)
return 1;
err = bpf_timer_init(&value->timer, map, CLOCK_MONOTONIC);
if (err) {
timer_init_err = err;
return 1;
}
err = bpf_timer_set_callback(&value->timer, timer_cb);
if (err) {
timer_set_callback_err = err;
return 1;
}
err = bpf_timer_start(&value->timer, TIMER_NSEC, BPF_F_TIMER_CPU_PIN);
if (err) {
timer_start_err = err;
return 1;
}
__sync_fetch_and_add(&armed, 1);
return 1;
}
static long cancel_timer_cb(struct bpf_map *map, u64 *key,
struct timer_value *value, void *ctx)
{
long err;
err = bpf_timer_cancel(&value->timer);
if (err == -EINVAL)
return 1;
if (err < 0) {
timer_cancel_err = err;
return 1;
}
__sync_fetch_and_add(&cancelled, 1);
return 1;
}
SEC("syscall")
int arm_deleted_timer(void *ctx)
{
bpf_for_each_map_elem(&timer_map, arm_timer_cb, NULL, 0);
return 0;
}
SEC("syscall")
int cancel_recycled_timer(void *ctx)
{
bpf_for_each_map_elem(&timer_map, cancel_timer_cb, NULL, 0);
return 0;
}
char _license[] SEC("license") = "GPL";
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