tools/testing/selftests/bpf/progs/tailcall3.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/bpf.h>
   3
   4 #include <bpf/bpf_helpers.h>
   5
   6 struct {
   7         __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
   8         __uint(max_entries, 1);
   9         __uint(key_size, sizeof(__u32));
  10         __uint(value_size, sizeof(__u32));
  11 } jmp_table SEC(".maps");
  12
  13 static volatile int count;
  14
  15 SEC("classifier/0")
  16 int bpf_func_0(struct __sk_buff *skb)
  17 {
  18         count++;
  19         bpf_tail_call_static(skb, &jmp_table, 0);
  20         return 1;
  21 }
  22
  23 SEC("classifier")
  24 int entry(struct __sk_buff *skb)
  25 {
  26         bpf_tail_call_static(skb, &jmp_table, 0);
  27         return 0;
  28 }
  29
  30 char __license[] SEC("license") = "GPL";
  31 int _version SEC("version") = 1;