1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/bpf.h> 3 #include <bpf/bpf_helpers.h> 4 #include "bpf_legacy.h" 5 #include "bpf_test_utils.h" 6 7 struct { 8 __uint(type, BPF_MAP_TYPE_PROG_ARRAY); 9 __uint(max_entries, 1); 10 __uint(key_size, sizeof(__u32)); 11 __uint(value_size, sizeof(__u32)); 12 } jmp_table SEC(".maps"); 13 14 int count = 0; 15 16 static __noinline 17 int subprog_tail(struct __sk_buff *skb) 18 { 19 bpf_tail_call_static(skb, &jmp_table, 0); 20 return 0; 21 } 22 23 SEC("tc") 24 int entry(struct __sk_buff *skb) 25 { 26 int ret = 1; 27 28 clobber_regs_stack(); 29 30 count++; 31 subprog_tail(skb); 32 subprog_tail(skb); 33 34 return ret; 35 } 36 37 char __license[] SEC("license") = "GPL"; 38