tools/testing/selftests/bpf/progs/test_global_func6.c

   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
   7 __attribute__ ((noinline))
   8 int f1(struct __sk_buff *skb)
   9 {
  10         return skb->len;
  11 }
  12
  13 int f3(int, struct __sk_buff *skb);
  14
  15 __attribute__ ((noinline))
  16 int f2(int val, struct __sk_buff *skb)
  17 {
  18         return f1(skb) + f3(val, skb + 1); /* type mismatch */
  19 }
  20
  21 __attribute__ ((noinline))
  22 int f3(int val, struct __sk_buff *skb)
  23 {
  24         return skb->ifindex * val;
  25 }
  26
  27 SEC("classifier/test")
  28 int test_cls(struct __sk_buff *skb)
  29 {
  30         return f1(skb) + f2(2, skb) + f3(3, skb);
  31 }