1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/bpf.h>
 3#include <bpf/bpf_helpers.h>
 4#include "bpf_legacy.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
15static __noinline
16int subprog_tail(struct __sk_buff *skb)
17{
18	bpf_tail_call_static(skb, &jmp_table, 0);
19	return 0;
20}
21
22SEC("tc")
23int entry(struct __sk_buff *skb)
24{
25	int ret = 1;
26
27	count++;
28	subprog_tail(skb);
29	subprog_tail(skb);
30
31	return ret;
32}
33
34char __license[] SEC("license") = "GPL";