tools/testing/selftests/bpf/progs/loop3.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2019 Facebook
   3 #include <linux/sched.h>
   4 #include <linux/ptrace.h>
   5 #include <stdint.h>
   6 #include <stddef.h>
   7 #include <stdbool.h>
   8 #include <linux/bpf.h>
   9 #include <bpf/bpf_helpers.h>
  10 #include <bpf/bpf_tracing.h>
  11
  12 char _license[] SEC("license") = "GPL";
  13
  14 SEC("raw_tracepoint/consume_skb")
  15 int while_true(volatile struct pt_regs* ctx)
  16 {
  17         __u64 i = 0, sum = 0;
  18         do {
  19                 i++;
  20                 sum += PT_REGS_RC(ctx);
  21         } while (i < 0x100000000ULL);
  22         return sum;
  23 }