1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/bpf.h>
3 #include <bpf/bpf_helpers.h>
4 #include "bpf_legacy.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 int count = 0;
14
15 static __noinline
16 int subprog_tail(struct __sk_buff *skb)
17 {
18 bpf_tail_call_static(skb, &jmp_table, 0);
19 return 0;
20 }
21
22 SEC("tc")
23 int 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
34 char __license[] SEC("license") = "GPL";
35
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