74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
|
|
|
|
#include <vmlinux.h>
|
|
#include <string.h>
|
|
#include <stdbool.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_tracing.h>
|
|
#include "bpf_misc.h"
|
|
|
|
#define ENTRIES 128
|
|
|
|
char _license[] SEC("license") = "GPL";
|
|
|
|
__u64 callback_scheduled = 0;
|
|
__u64 callback_success = 0;
|
|
__u64 schedule_error = 0;
|
|
__u64 delete_success = 0;
|
|
|
|
struct elem {
|
|
__u32 count;
|
|
struct bpf_task_work tw;
|
|
};
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_HASH);
|
|
__uint(map_flags, BPF_F_NO_PREALLOC);
|
|
__uint(max_entries, ENTRIES);
|
|
__type(key, int);
|
|
__type(value, struct elem);
|
|
} hmap SEC(".maps");
|
|
|
|
static int process_work(struct bpf_map *map, void *key, void *value)
|
|
{
|
|
__sync_fetch_and_add(&callback_success, 1);
|
|
return 0;
|
|
}
|
|
|
|
SEC("syscall")
|
|
int schedule_task_work(void *ctx)
|
|
{
|
|
struct elem empty_work = {.count = 0};
|
|
struct elem *work;
|
|
int key = 0, err;
|
|
|
|
key = bpf_ktime_get_ns() % ENTRIES;
|
|
work = bpf_map_lookup_elem(&hmap, &key);
|
|
if (!work) {
|
|
bpf_map_update_elem(&hmap, &key, &empty_work, BPF_NOEXIST);
|
|
work = bpf_map_lookup_elem(&hmap, &key);
|
|
if (!work)
|
|
return 0;
|
|
}
|
|
err = bpf_task_work_schedule_signal_impl(bpf_get_current_task_btf(), &work->tw, &hmap,
|
|
process_work, NULL);
|
|
if (err)
|
|
__sync_fetch_and_add(&schedule_error, 1);
|
|
else
|
|
__sync_fetch_and_add(&callback_scheduled, 1);
|
|
return 0;
|
|
}
|
|
|
|
SEC("syscall")
|
|
int delete_task_work(void *ctx)
|
|
{
|
|
int key = 0, err;
|
|
|
|
key = bpf_get_prandom_u32() % ENTRIES;
|
|
err = bpf_map_delete_elem(&hmap, &key);
|
|
if (!err)
|
|
__sync_fetch_and_add(&delete_success, 1);
|
|
return 0;
|
|
}
|