1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2018 Facebook */
3 #include <stddef.h>
4 #include <linux/bpf.h>
5 #include <linux/types.h>
6 #include <bpf/bpf_helpers.h>
7 
8 struct {
9 	__uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
10 	__uint(max_entries, 1);
11 	__uint(map_flags, 0);
12 	__type(key, __u32);
13 	__type(value, __u32);
14 } mim_array SEC(".maps");
15 
16 struct {
17 	__uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
18 	__uint(max_entries, 1);
19 	__uint(map_flags, 0);
20 	__type(key, int);
21 	__type(value, __u32);
22 } mim_hash SEC(".maps");
23 
24 /* The following three maps are used to test
25  * perf_event_array map can be an inner
26  * map of hash/array_of_maps.
27  */
28 struct perf_event_array {
29 	__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
30 	__type(key, __u32);
31 	__type(value, __u32);
32 } inner_map0 SEC(".maps");
33 
34 struct {
35 	__uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
36 	__uint(max_entries, 1);
37 	__type(key, __u32);
38 	__array(values, struct perf_event_array);
39 } mim_array_pe SEC(".maps") = {
40 	.values = {&inner_map0}};
41 
42 struct {
43 	__uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
44 	__uint(max_entries, 1);
45 	__type(key, __u32);
46 	__array(values, struct perf_event_array);
47 } mim_hash_pe SEC(".maps") = {
48 	.values = {&inner_map0}};
49 
50 SEC("xdp")
51 int xdp_mimtest0(struct xdp_md *ctx)
52 {
53 	int value = 123;
54 	int *value_p;
55 	int key = 0;
56 	void *map;
57 
58 	map = bpf_map_lookup_elem(&mim_array, &key);
59 	if (!map)
60 		return XDP_DROP;
61 
62 	bpf_map_update_elem(map, &key, &value, 0);
63 	value_p = bpf_map_lookup_elem(map, &key);
64 	if (!value_p || *value_p != 123)
65 		return XDP_DROP;
66 
67 	map = bpf_map_lookup_elem(&mim_hash, &key);
68 	if (!map)
69 		return XDP_DROP;
70 
71 	bpf_map_update_elem(map, &key, &value, 0);
72 
73 	return XDP_PASS;
74 }
75 
76 char _license[] SEC("license") = "GPL";
77