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