| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | /* Copyright (c) 2020 Facebook */ |
| 3 | #include <stddef.h> |
| 4 | #include <linux/bpf.h> |
| 5 | #include <bpf/bpf_helpers.h> |
| 6 | #include "bpf_misc.h" |
| 7 | |
| 8 | __attribute__ ((noinline)) |
| 9 | int f1(struct __sk_buff *skb) |
| 10 | { |
| 11 | return skb->len; |
| 12 | } |
| 13 | |
| 14 | __attribute__ ((noinline)) |
| 15 | int f2(int val, struct __sk_buff *skb) |
| 16 | { |
| 17 | return f1(skb) + val; |
| 18 | } |
| 19 | |
| 20 | __attribute__ ((noinline)) |
| 21 | int f3(int val, struct __sk_buff *skb, int var) |
| 22 | { |
| 23 | return f2(val: var, skb) + val; |
| 24 | } |
| 25 | |
| 26 | __attribute__ ((noinline)) |
| 27 | int f4(struct __sk_buff *skb) |
| 28 | { |
| 29 | return f3(val: 1, skb, var: 2); |
| 30 | } |
| 31 | |
| 32 | __attribute__ ((noinline)) |
| 33 | int f5(struct __sk_buff *skb) |
| 34 | { |
| 35 | return f4(skb); |
| 36 | } |
| 37 | |
| 38 | __attribute__ ((noinline)) |
| 39 | int f6(struct __sk_buff *skb) |
| 40 | { |
| 41 | return f5(skb); |
| 42 | } |
| 43 | |
| 44 | __attribute__ ((noinline)) |
| 45 | int f7(struct __sk_buff *skb) |
| 46 | { |
| 47 | return f6(skb); |
| 48 | } |
| 49 | |
| 50 | __attribute__ ((noinline)) |
| 51 | int f8(struct __sk_buff *skb) |
| 52 | { |
| 53 | return f7(skb); |
| 54 | } |
| 55 | |
| 56 | SEC("tc") |
| 57 | __failure __msg("the call stack of 8 frames") |
| 58 | int global_func3(struct __sk_buff *skb) |
| 59 | { |
| 60 | return f8(skb); |
| 61 | } |
| 62 |