1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020 Facebook */
3 #include "bpf_iter.h"
4 #include <bpf/bpf_helpers.h>
5
6 char _license[] SEC("license") = "GPL";
7
8 __u32 map1_id = 0, map2_id = 0;
9 __u32 map1_accessed = 0, map2_accessed = 0;
10 __u64 map1_seqnum = 0, map2_seqnum1 = 0, map2_seqnum2 = 0;
11
12 volatile const __u32 print_len;
13 volatile const __u32 ret1;
14
15 SEC("iter/bpf_map")
16 int dump_bpf_map(struct bpf_iter__bpf_map *ctx)
17 {
18 struct seq_file *seq = ctx->meta->seq;
19 struct bpf_map *map = ctx->map;
20 __u64 seq_num;
21 int i, ret = 0;
22
23 if (map == (void *)0)
24 return 0;
25
26 /* only dump map1_id and map2_id */
27 if (map->id != map1_id && map->id != map2_id)
28 return 0;
29
30 seq_num = ctx->meta->seq_num;
31 if (map->id == map1_id) {
32 map1_seqnum = seq_num;
33 map1_accessed++;
34 }
35
36 if (map->id == map2_id) {
37 if (map2_accessed == 0) {
38 map2_seqnum1 = seq_num;
39 if (ret1)
40 ret = 1;
41 } else {
42 map2_seqnum2 = seq_num;
43 }
44 map2_accessed++;
45 }
46
47 /* fill seq_file buffer */
48 for (i = 0; i < (int)print_len; i++)
49 bpf_seq_write(seq, &seq_num, sizeof(seq_num));
50
51 return ret;
52 }
53
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