// SPDX-License-Identifier: GPL-2.0-only /* Copyright (c) 2020 Facebook */ #include <stddef.h> #include <linux/bpf.h> #include <bpf/bpf_helpers.h> #include "bpf_misc.h" __attribute__ ((noinline)) int f1(struct __sk_buff *skb) { return skb->len; } __attribute__ ((noinline)) int f2(int val, struct __sk_buff *skb) { return f1(skb) + val; } __attribute__ ((noinline)) int f3(int val, struct __sk_buff *skb, int var) { return f2(var, skb) + val; } __attribute__ ((noinline)) int f4(struct __sk_buff *skb) { return f3(1, skb, 2); } __attribute__ ((noinline)) int f5(struct __sk_buff *skb) { return f4(skb); } __attribute__ ((noinline)) int f6(struct __sk_buff *skb) { return f5(skb); } __attribute__ ((noinline)) int f7(struct __sk_buff *skb) { return f6(skb); } __attribute__ ((noinline)) int f8(struct __sk_buff *skb) { return f7(skb); } SEC("tc") __failure __msg("the call stack of 8 frames") int global_func3(struct __sk_buff *skb) { return f8(skb); }