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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2021 Facebook */
   3
   4 #include "vmlinux.h"
   5 #include <bpf/bpf_helpers.h>
   6 #include <bpf/bpf_tracing.h>
   7
   8 char _license[] SEC("license") = "GPL";
   9
  10 struct {
  11         __uint(type, BPF_MAP_TYPE_HASH);
  12         __uint(max_entries, 1);
  13         __type(key, int);
  14         __type(value, long);
  15 } hash1 SEC(".maps");
  16
  17 struct {
  18         __uint(type, BPF_MAP_TYPE_HASH);
  19         __uint(max_entries, 1);
  20         __type(key, int);
  21         __type(value, long);
  22 } hash2 SEC(".maps");
  23
  24 int pass1 = 0;
  25 int pass2 = 0;
  26
  27 SEC("fentry/htab_map_delete_elem")
  28 int BPF_PROG(on_delete, struct bpf_map *map)
  29 {
  30         int key = 0;
  31
  32         if (map == (void *)&hash1) {
  33                 pass1++;
  34                 return 0;
  35         }
  36         if (map == (void *)&hash2) {
  37                 pass2++;
  38                 bpf_map_delete_elem(&hash2, &key);
  39                 return 0;
  40         }
  41
  42         return 0;
  43 }