LXR linux/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
   6struct {
   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
  13int count = 0;
  14
  15SEC("classifier/0")
  16int bpf_func_0(struct __sk_buff *skb)
  17{
  18        count++;
  19        bpf_tail_call_static(skb, &jmp_table, 0);
  20        return 1;
  21}
  22
  23SEC("classifier")
  24int entry(struct __sk_buff *skb)
  25{
  26        bpf_tail_call_static(skb, &jmp_table, 0);
  27        return 0;
  28}
  29
  30char __license[] SEC("license") = "GPL";
  31int _version SEC("version") = 1;
  32