/*
// Copyright (c) 2010-2017 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/
#include "prox_cksum.h"
#include "prox_port_cfg.h"
#include <rte_byteorder.h>
#include "log.h"
/* compute IP 16 bit checksum */
void prox_ip_cksum_sw(struct ipv4_hdr *buf)
{
const uint16_t size = sizeof(struct ipv4_hdr);
uint32_t cksum = 0;
uint32_t nb_dwords;
uint32_t tail, mask;
uint32_t *pdwd = (uint32_t *)buf;
/* compute 16 bit checksum using hi and low parts of 32 bit integers */
for (nb_dwords = (size >> 2); nb_dwords > 0; --nb_dwords) {
cksum += (*pdwd >> 16);
cksum += (*pdwd & 0xFFFF);
++pdwd;
}
/* deal with the odd byte length */
if (size & 0x03) {
tail =
