162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 262306a36Sopenharmony_ci// Copyright (c) 2019 Facebook 362306a36Sopenharmony_ci#include <linux/bpf.h> 462306a36Sopenharmony_ci#include <bpf/bpf_helpers.h> 562306a36Sopenharmony_ci 662306a36Sopenharmony_cichar _license[] SEC("license") = "GPL"; 762306a36Sopenharmony_ci 862306a36Sopenharmony_ciSEC("socket") 962306a36Sopenharmony_ciint combinations(volatile struct __sk_buff* skb) 1062306a36Sopenharmony_ci{ 1162306a36Sopenharmony_ci int ret = 0, i; 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci#pragma nounroll 1462306a36Sopenharmony_ci for (i = 0; i < 20; i++) 1562306a36Sopenharmony_ci if (skb->len) 1662306a36Sopenharmony_ci ret |= 1 << i; 1762306a36Sopenharmony_ci return ret; 1862306a36Sopenharmony_ci} 19