1// SPDX-License-Identifier: GPL-2.0
2#include "vmlinux.h"
3#include <bpf/bpf_helpers.h>
4
5char _license[] SEC("license") = "GPL";
6
7struct {
8	__uint(type, BPF_MAP_TYPE_ARRAY);
9	__uint(max_entries, 3);
10	__type(key, __u32);
11	__type(value, __u64);
12} arraymap SEC(".maps");
13
14struct {
15	__uint(type, BPF_MAP_TYPE_HASH);
16	__uint(max_entries, 5);
17	__type(key, __u32);
18	__type(value, __u64);
19} hashmap SEC(".maps");
20
21struct callback_ctx {
22	int output;
23};
24
25u32 data_output = 0;
26int use_array = 0;
27
28static __u64
29check_map_elem(struct bpf_map *map, __u32 *key, __u64 *val,
30	       struct callback_ctx *data)
31{
32	data->output += *val;
33	return 0;
34}
35
36SEC("tc")
37int test_pkt_access(struct __sk_buff *skb)
38{
39	struct callback_ctx data;
40
41	data.output = 0;
42	if (use_array)
43		bpf_for_each_map_elem(&arraymap, check_map_elem, &data, 0);
44	else
45		bpf_for_each_map_elem(&hashmap, check_map_elem, &data, 0);
46	data_output = data.output;
47
48	return 0;
49}
50