tools/testing/selftests/bpf/progs/test_btf_newkv.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 /* just to validate we can handle maps in multiple sections */
  15 struct bpf_map_def SEC("maps") btf_map_legacy = {
  16         .type = BPF_MAP_TYPE_ARRAY,
  17         .key_size = sizeof(int),
  18         .value_size = sizeof(long long),
  19         .max_entries = 4,
  20 };
  21
  22 BPF_ANNOTATE_KV_PAIR(btf_map_legacy, int, struct ipv_counts);
  23
  24 struct {
  25         __uint(type, BPF_MAP_TYPE_ARRAY);
  26         __uint(max_entries, 4);
  27         __type(key, int);
  28         __type(value, struct ipv_counts);
  29 } btf_map SEC(".maps");
  30
  31 __attribute__((noinline))
  32 int test_long_fname_2(void)
  33 {
  34         struct ipv_counts *counts;
  35         int key = 0;
  36
  37         counts = bpf_map_lookup_elem(&btf_map, &key);
  38         if (!counts)
  39                 return 0;
  40
  41         counts->v6++;
  42
  43         /* just verify we can reference both maps */
  44         counts = bpf_map_lookup_elem(&btf_map_legacy, &key);
  45         if (!counts)
  46                 return 0;
  47
  48         return 0;
  49 }
  50
  51 __attribute__((noinline))
  52 int test_long_fname_1(void)
  53 {
  54         return test_long_fname_2();
  55 }
  56
  57 SEC("dummy_tracepoint")
  58 int _dummy_tracepoint(void *arg)
  59 {
  60         return test_long_fname_1();
  61 }
  62
  63 char _license[] SEC("license") = "GPL";