47 lines
855 B
C
47 lines
855 B
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2021 Facebook */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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char _license[] SEC("license") = "GPL";
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__uint(max_entries, 1);
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__type(key, int);
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__type(value, long);
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} hash1 SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__uint(max_entries, 1);
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__type(key, int);
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__type(value, long);
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} hash2 SEC(".maps");
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int pass1 = 0;
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int pass2 = 0;
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SEC("fentry/__htab_map_lookup_elem")
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int BPF_PROG(on_lookup, struct bpf_map *map)
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{
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int key = 0;
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if (map == (void *)&hash1) {
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pass1++;
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return 0;
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}
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if (map == (void *)&hash2) {
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pass2++;
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/* htab_map_gen_lookup() will inline below call
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* into direct call to __htab_map_lookup_elem()
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*/
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bpf_map_lookup_elem(&hash2, &key);
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return 0;
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}
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return 0;
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}
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