75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2021 Facebook */
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#include <linux/bpf.h>
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#include <time.h>
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#include <errno.h>
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#include <bpf/bpf_helpers.h>
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#include "bpf_tcp_helpers.h"
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char _license[] SEC("license") = "GPL";
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struct hmap_elem {
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int pad; /* unused */
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struct bpf_timer timer;
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};
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struct inner_map {
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__uint(type, BPF_MAP_TYPE_HASH);
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__uint(max_entries, 1024);
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__type(key, int);
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__type(value, struct hmap_elem);
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} inner_htab SEC(".maps");
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#define ARRAY_KEY 1
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#define ARRAY_KEY2 2
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#define HASH_KEY 1234
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struct outer_arr {
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__uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
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__uint(max_entries, 2);
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__uint(key_size, sizeof(int));
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__uint(value_size, sizeof(int));
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__array(values, struct inner_map);
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} outer_arr SEC(".maps") = {
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.values = { [ARRAY_KEY] = &inner_htab },
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};
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__u64 err;
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__u64 ok;
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__u64 cnt;
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/* callback for inner hash map */
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static int timer_cb(void *map, int *key, struct hmap_elem *val)
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{
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return 0;
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}
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SEC("fentry/bpf_fentry_test1")
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int BPF_PROG(test1, int a)
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{
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struct hmap_elem init = {};
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struct bpf_map *inner_map, *inner_map2;
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struct hmap_elem *val;
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int array_key = ARRAY_KEY;
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int array_key2 = ARRAY_KEY2;
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int hash_key = HASH_KEY;
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inner_map = bpf_map_lookup_elem(&outer_arr, &array_key);
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if (!inner_map)
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return 0;
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inner_map2 = bpf_map_lookup_elem(&outer_arr, &array_key2);
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if (!inner_map2)
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return 0;
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bpf_map_update_elem(inner_map, &hash_key, &init, 0);
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val = bpf_map_lookup_elem(inner_map, &hash_key);
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if (!val)
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return 0;
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bpf_timer_init(&val->timer, inner_map2, CLOCK_MONOTONIC);
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if (bpf_timer_set_callback(&val->timer, timer_cb))
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err |= 4;
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if (bpf_timer_start(&val->timer, 0, 0))
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err |= 8;
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return 0;
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}
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