| 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 | #include <bpf/bpf_tracing.h> |
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| 6 | |
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| 7 | char _license[] SEC("license" ) = "GPL" ; |
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| 8 | |
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| 9 | struct key_t { |
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| 10 | int a; |
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| 11 | int b; |
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| 12 | int c; |
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| 13 | }; |
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| 14 | |
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| 15 | struct { |
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| 16 | __uint(type, BPF_MAP_TYPE_ARRAY); |
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| 17 | __uint(max_entries, 3); |
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| 18 | __type(key, __u32); |
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| 19 | __type(value, __u64); |
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| 20 | } arraymap1 SEC(".maps" ); |
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| 21 | |
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| 22 | struct { |
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| 23 | __uint(type, BPF_MAP_TYPE_HASH); |
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| 24 | __uint(max_entries, 10); |
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| 25 | __type(key, __u64); |
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| 26 | __type(value, __u32); |
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| 27 | } hashmap1 SEC(".maps" ); |
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| 28 | |
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| 29 | __u32 key_sum = 0; |
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| 30 | __u64 val_sum = 0; |
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| 31 | |
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| 32 | SEC("iter/bpf_map_elem" ) |
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| 33 | int dump_bpf_array_map(struct bpf_iter__bpf_map_elem *ctx) |
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| 34 | { |
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| 35 | __u32 *hmap_val, *key = ctx->key; |
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| 36 | __u64 *val = ctx->value; |
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| 37 | |
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| 38 | if (key == (void *)0 || val == (void *)0) |
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| 39 | return 0; |
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| 40 | |
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| 41 | bpf_seq_write(ctx->meta->seq, key, sizeof(__u32)); |
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| 42 | bpf_seq_write(ctx->meta->seq, val, sizeof(__u64)); |
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| 43 | key_sum += *key; |
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| 44 | val_sum += *val; |
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| 45 | |
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| 46 | /* workaround - It's necessary to do this convoluted (val, key) |
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| 47 | * write into hashmap1, instead of simply doing |
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| 48 | * bpf_map_update_elem(&hashmap1, val, key, BPF_ANY); |
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| 49 | * because key has MEM_RDONLY flag and bpf_map_update elem expects |
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| 50 | * types without this flag |
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| 51 | */ |
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| 52 | bpf_map_update_elem(&hashmap1, val, val, BPF_ANY); |
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| 53 | hmap_val = bpf_map_lookup_elem(&hashmap1, val); |
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| 54 | if (hmap_val) |
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| 55 | *hmap_val = *key; |
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| 56 | |
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| 57 | *val = *key; |
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| 58 | return 0; |
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| 59 | } |
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| 60 | |
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