1 | // SPDX-License-Identifier: GPL-2.0 |
2 | |
3 | #include <linux/bpf.h> |
4 | #include <bpf/bpf_helpers.h> |
5 | |
6 | char _license[] SEC("license" ) = "GPL" ; |
7 | |
8 | struct { |
9 | __uint(type, BPF_MAP_TYPE_HASH); |
10 | __uint(max_entries, 2); |
11 | __type(key, struct bigelement); |
12 | __type(value, __u32); |
13 | } hash_map SEC(".maps" ); |
14 | |
15 | struct { |
16 | __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY); |
17 | __uint(max_entries, 1); |
18 | __type(key, __u32); |
19 | __type(value, struct bigelement); |
20 | } key_map SEC(".maps" ); |
21 | |
22 | struct bigelement { |
23 | int a; |
24 | char b[4096]; |
25 | long long c; |
26 | }; |
27 | |
28 | SEC("raw_tracepoint/sys_enter" ) |
29 | int bpf_hash_large_key_test(void *ctx) |
30 | { |
31 | int zero = 0, value = 42; |
32 | struct bigelement *key; |
33 | |
34 | key = bpf_map_lookup_elem(&key_map, &zero); |
35 | if (!key) |
36 | return 0; |
37 | |
38 | key->c = 1; |
39 | if (bpf_map_update_elem(&hash_map, key, &value, BPF_ANY)) |
40 | return 0; |
41 | |
42 | return 0; |
43 | } |
44 | |
45 | |