tools/testing/selftests/bpf/test_btf_nokv.c

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