tools/testing/selftests/bpf/progs/test_btf_haskv.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* Copyright (c) 2018 Facebook */
   3 #include <linux/bpf.h>
   4 #include <bpf/bpf_helpers.h>
   5 #include "bpf_legacy.h"
   6
   7 int _version SEC("version") = 1;
   8
   9 struct ipv_counts {
  10         unsigned int v4;
  11         unsigned int v6;
  12 };
  13
  14 struct bpf_map_def SEC("maps") btf_map = {
  15         .type = BPF_MAP_TYPE_ARRAY,
  16         .key_size = sizeof(int),
  17         .value_size = sizeof(struct ipv_counts),
  18         .max_entries = 4,
  19 };
  20
  21 BPF_ANNOTATE_KV_PAIR(btf_map, int, struct ipv_counts);
  22
  23 __attribute__((noinline))
  24 int test_long_fname_2(void)
  25 {
  26         struct ipv_counts *counts;
  27         int key = 0;
  28
  29         counts = bpf_map_lookup_elem(&btf_map, &key);
  30         if (!counts)
  31                 return 0;
  32
  33         counts->v6++;
  34
  35         return 0;
  36 }
  37
  38 __attribute__((noinline))
  39 int test_long_fname_1(void)
  40 {
  41         return test_long_fname_2();
  42 }
  43
  44 SEC("dummy_tracepoint")
  45 int _dummy_tracepoint(void *arg)
  46 {
  47         return test_long_fname_1();
  48 }
  49
  50 char _license[] SEC("license") = "GPL";