arch/arm/plat-feroceon/mv_hal/eth/nfp/mvNfpPpp.c - kernel/prism - Git at Google

 /*******************************************************************************
 Copyright (C) Marvell Interpppional Ltd. and its affiliates

 This software file (the "File") is owned and distributed by Marvell
 Interpppional Ltd. and/or its affiliates ("Marvell") under the following
 alterpppive licensing terms.  Once you have made an election to distribute the
 File under one of the following license alterpppives, please (i) delete this
 introductory statement regarding license alterpppives, (ii) delete the two
 license alterpppives that you have not elected to use and (iii) preserve the
 Marvell copyright notice above.

 ********************************************************************************
 Marvell Commercial License Option

 If you received this File from Marvell and you have entered into a commercial
 license agreement (a "Commercial License") with Marvell, the File is licensed
 to you under the terms of the applicable Commercial License.

 ********************************************************************************
 Marvell GPL License Option

 If you received this File from Marvell, you may opt to use, redistribute and/or
 modify this File in accordance with the terms and conditions of the General
 Public License Version 2, June 1991 (the "GPL License"), a copy of which is
 available along with the File in the license.txt file or by writing to the Free
 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 or
 on the worldwide web at http://www.gnu.org/licenses/gpl.txt.

 THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE IMPLIED
 WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY
 DISCLAIMED.  The GPL License provides additional details about this warranty
 disclaimer.
 ********************************************************************************
 Marvell BSD License Option

 If you received this File from Marvell, you may opt to use, redistribute and/or
 modify this File under the following licensing terms.
 Redistribution and use in source and binary forms, with or without modification,
 are permitted provided that the following conditions are met:

     *   Redistributions of source code must retain the above copyright notice,
 	this list of conditions and the following disclaimer.

     *   Redistributions in binary form must reproduce the above copyright
 	notice, this list of conditions and the following disclaimer in the
 	documentation and/or other materials provided with the distribution.

     *   Neither the name of Marvell nor the names of its contributors may be
 	used to endorse or promote products derived from this software without
 	specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *******************************************************************************/

 /*******************************************************************************
 * mvPPP.c - Marvell Fast Route PPP Processing
 *
 * DESCRIPTION:
 *
 *       Supported Features:
 *       - OS independent.
 *
 *******************************************************************************/

 /* includes */
 #include "mvTypes.h"
 #include "mvOs.h"
 #include "mvStack.h"
 #include "mvDebug.h"
 #include "eth/nfp/mvNfp.h"
 #include "eth/mvEth.h"

 #define MACFMT    "%02X:%02X:%02X:%02X:%02X:%02X"
 #define MACSTR(m) m[0], m[1], m[2], m[3], m[4], m[5]

 MV_FP_PPP_RULE pppOpen[ETH_FP_IFINDEX_MAX];	/* connected pppoe sessions */
 MV_FP_PPP_RULE pppHalf[ETH_FP_IFINDEX_MAX];	/* half-open pppoe connections */

 MV_STATUS mvFpPppInit(void)
 {
 	memset(pppOpen, 0, sizeof(MV_FP_PPP_RULE) * ETH_FP_IFINDEX_MAX);
 	memset(pppHalf, 0, sizeof(MV_FP_PPP_RULE) * ETH_FP_IFINDEX_MAX);

 	mvOsPrintf("NFP (pppoe) init %d entries, %d bytes\n", ETH_FP_IFINDEX_MAX,
 		   2 * sizeof(MV_FP_PPP_RULE) * ETH_FP_IFINDEX_MAX);
 	return MV_OK;
 }

 /* Clear Fast Route Bridge Rule Database (SNAT + DNAT table) */
 MV_STATUS mvFpPppClear(void)
 {
 	memset(pppOpen, 0, sizeof(MV_FP_PPP_RULE) * ETH_FP_IFINDEX_MAX);
 	return MV_OK;
 }

 void mvFpPppDestroy(void)
 {
 	mvFpPppClear();
 }

 void mvFpPppRulePrint(char *text, MV_FP_PPP_RULE * rule)
 {
 	mvOsPrintf("NFP (pppoe): ppp %s (%s) if_ppp=%u if_eth=%u session=%u DA=" MACFMT " SA=" MACFMT " %x\n",
 		   text, rule->pppInfo.if_ppp ? "open" : "half",
 		   rule->pppInfo.if_ppp,
 		   rule->pppInfo.if_eth,
 		   rule->pppInfo.u.ppp.session,
 		   MACSTR(rule->pppInfo.u.ppp.da), MACSTR(rule->pppInfo.u.ppp.sa), rule->pppInfo.channel);
 }

 MV_STATUS mvFpPppRuleSet(MV_FP_PPP_RULE *rule)
 {
 	int if_ppp = rule->pppInfo.if_ppp;
 	int i = ETH_FP_IFINDEX_MAX;

 #ifdef MV_FP_DEBUG
 	mvFpPppRulePrint("new", rule);
 #endif

 	/* half open */
 	if (!if_ppp) {
 		memcpy(&pppHalf[rule->pppInfo.if_eth], rule, sizeof(MV_FP_PPP_RULE));
 	} else
 		while (i--) {
 			/* look for channel id match */
 			if (pppHalf[i].pppInfo.channel == rule->pppInfo.channel) {
 				memcpy(&pppOpen[if_ppp], &pppHalf[i], sizeof(MV_FP_PPP_RULE));
 				memset(&pppHalf[i], 0, sizeof(MV_FP_PPP_RULE));
 				pppOpen[if_ppp].pppInfo.if_ppp = if_ppp;
 				break;
 			}
 		}

 	return MV_OK;
 }

 MV_STATUS mvFpPppRuleDel(MV_FP_PPP_RULE *rule)
 {
 	int i = ETH_FP_IFINDEX_MAX;

 #ifdef MV_FP_DEBUG
 	mvOsPrintf("NFP (pppoe): del ppp channel %x\n", rule->pppInfo.channel);
 #endif

 	while (i--) {
 		if (pppOpen[i].pppInfo.channel == rule->pppInfo.channel) {
 			mvFpPppRulePrint("del", &pppOpen[i]);
 			pppOpen[i].pppInfo.if_ppp = 0;
 			memset(&pppOpen[i], 0, sizeof(MV_FP_PPP_RULE));
 			break;
 		}
 	}

 	return MV_OK;
 }

 MV_U32 mvFpPppRuleAge(MV_FP_PPP_RULE *rule)
 {
 	return MV_OK;
 }

 MV_STATUS mvFpPppPrint(void)
 {
 	int i = ETH_FP_IFINDEX_MAX;

 	while (i--) {
 		if (pppOpen[i].pppInfo.if_eth)
 			mvFpPppRulePrint("", &pppOpen[i]);

 		if (pppHalf[i].pppInfo.if_eth)
 			mvFpPppRulePrint("", &pppHalf[i]);

 	}

 	return MV_OK;
 }

 MV_U32 mvFpPppPhyIf(MV_U32 ifIndex)
 {
 	if (pppOpen[ifIndex].pppInfo.if_ppp)
 		return pppOpen[ifIndex].pppInfo.if_eth;
 	return ETH_FP_IFINDEX_MAX;
 }

 /* IP header csum calculation */
 static inline unsigned short from32to16(unsigned long x)
 {
 	/* add up 16-bit and 16-bit for 16+c bit */
 	x = (x & 0xffff) + (x >> 16);
 	/* add up carry.. */
 	x = (x & 0xffff) + (x >> 16);
 	return x;
 }

 static unsigned long do_csum(char *buff, int len)
 {
 	int odd, count;
 	unsigned long result = 0;

 	if (len <= 0)
 		goto out;
 	odd = 1 & (unsigned long)buff;
 	if (odd) {
 		result = *buff;
 		len--;
 		buff++;
 	}
 	count = len >> 1;	/* nr of 16-bit words.. */
 	if (count) {
 		if (2 & (unsigned long)buff) {
 			result += *(unsigned short *)buff;
 			count--;
 			len -= 2;
 			buff += 2;
 		}
 		count >>= 1;	/* nr of 32-bit words.. */
 		if (count) {
 			unsigned long carry = 0;
 			do {
 				unsigned long w = *(unsigned long *)buff;
 				count--;
 				buff += 4;
 				result += carry;
 				result += w;
 				carry = (w > result);
 			} while (count);
 			result += carry;
 			result = (result & 0xffff) + (result >> 16);
 		}
 		if (len & 2) {
 			result += *(unsigned short *)buff;
 			buff += 2;
 		}
 	}
 	if (len & 1)
 		result += (*buff << 8);
 	result = from32to16(result);
 	if (odd)
 		result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
 out:
 	return result;
 }

 static INLINE void mvFpCSumIP(MV_IP_HEADER *pIpHdr)
 {
 	pIpHdr->checksum = 0;
 	pIpHdr->checksum = ~do_csum((char *)pIpHdr, 20 /*iph->ihl */);
 }

 static INLINE MV_U32 mvFpPppLookup(MV_U32 ifIndex)
 {
 	return pppOpen[ifIndex].pppInfo.if_ppp;
 }

 /* NFP bottom half */
 int mvFpPPPoE(MV_U32 ifIndex, MV_PKT_INFO *pPkt, MV_FP_STATS *pFpStats)
 {
 	MV_U8 *pEth = pPkt->pFrags->bufVirtPtr;
 	MV_BUF_INFO *pBuf = pPkt->pFrags;

 	MV_NFP_STAT(pFpStats->ppp_tx_esp++);

 	/* Encapsulate PPPoE on Tx */
 	if (!mvFpPppLookup(ifIndex)) {
 		MV_NFP_STAT(pFpStats->ppp_err++);
 		return MV_FAIL;
 	}

 	if (pBuf->dataSize > ETH_FP_PPPOE_MTU) {
 		/* Bad, we check size in the mvNfpSecOutgoing() --BK */
 		mvOsPrintf("PPPoE oversize %d > %d\n", pBuf->dataSize, ETH_FP_PPPOE_MTU);
 		MV_NFP_STAT(pFpStats->ppp_err++);
 		return MV_FAIL;
 	}

 	pBuf->bufAddrShift += ETH_FP_PPPOE_HDR;
 	pBuf->bufPhysAddr -= ETH_FP_PPPOE_HDR;
 	pBuf->bufVirtPtr -= ETH_FP_PPPOE_HDR;
 	pBuf->dataSize += ETH_FP_PPPOE_HDR;
 	pEth -= ETH_FP_PPPOE_HDR;

 	/* -6B aligment from 32B boundary */
 	{
 		MV_U32 *d = (MV_U32 *) pEth;
 		MV_U32 *s = pppOpen[ifIndex].pppInfo.u.u32;

 		*(d++) = *(s++);
 		*(d++) = *(s++);
 		*(d++) = *(s++);
 		*(d++) = *(s++);
 		*(d++) = *(s++);
 		*(d++) = *(s++);
 	}

 	/* update payload len */
 	*(MV_U16 *) (pEth + 20) = htons(pBuf->dataSize - 14 - ETH_FP_PPPOE_HDR);

 	/* recalculate IP csum in sw */
 	mvFpCSumIP((MV_IP_HEADER *) (pEth + 24));
 	pPkt->status = 0;

 	/* flush two cachelines */
 	mvOsCacheLineFlushInv(NULL, pEth);
 	mvOsCacheLineFlushInv(NULL, pEth + 32);

 	return MV_OK;
 }
	/*******************************************************************************
	Copyright (C) Marvell Interpppional Ltd. and its affiliates

	This software file (the "File") is owned and distributed by Marvell
	Interpppional Ltd. and/or its affiliates ("Marvell") under the following
	alterpppive licensing terms. Once you have made an election to distribute the
	File under one of the following license alterpppives, please (i) delete this
	introductory statement regarding license alterpppives, (ii) delete the two
	license alterpppives that you have not elected to use and (iii) preserve the
	Marvell copyright notice above.

	********************************************************************************
	Marvell Commercial License Option

	If you received this File from Marvell and you have entered into a commercial
	license agreement (a "Commercial License") with Marvell, the File is licensed
	to you under the terms of the applicable Commercial License.

	********************************************************************************
	Marvell GPL License Option

	If you received this File from Marvell, you may opt to use, redistribute and/or
	modify this File in accordance with the terms and conditions of the General
	Public License Version 2, June 1991 (the "GPL License"), a copy of which is
	available along with the File in the license.txt file or by writing to the Free
	Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 or
	on the worldwide web at http://www.gnu.org/licenses/gpl.txt.

	THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE IMPLIED
	WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY
	DISCLAIMED. The GPL License provides additional details about this warranty
	disclaimer.
	********************************************************************************
	Marvell BSD License Option

	If you received this File from Marvell, you may opt to use, redistribute and/or
	modify this File under the following licensing terms.
	Redistribution and use in source and binary forms, with or without modification,
	are permitted provided that the following conditions are met:

	* Redistributions of source code must retain the above copyright notice,
	this list of conditions and the following disclaimer.

	* Redistributions in binary form must reproduce the above copyright
	notice, this list of conditions and the following disclaimer in the
	documentation and/or other materials provided with the distribution.

	* Neither the name of Marvell nor the names of its contributors may be
	used to endorse or promote products derived from this software without
	specific prior written permission.

	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
	ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
	ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
	ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	*******************************************************************************/

	/*******************************************************************************
	* mvPPP.c - Marvell Fast Route PPP Processing
	*
	* DESCRIPTION:
	*
	* Supported Features:
	* - OS independent.
	*
	*******************************************************************************/

	/* includes */
	#include "mvTypes.h"
	#include "mvOs.h"
	#include "mvStack.h"
	#include "mvDebug.h"
	#include "eth/nfp/mvNfp.h"
	#include "eth/mvEth.h"

	#define MACFMT "%02X:%02X:%02X:%02X:%02X:%02X"
	#define MACSTR(m) m[0], m[1], m[2], m[3], m[4], m[5]

	MV_FP_PPP_RULE pppOpen[ETH_FP_IFINDEX_MAX]; /* connected pppoe sessions */
	MV_FP_PPP_RULE pppHalf[ETH_FP_IFINDEX_MAX]; /* half-open pppoe connections */

	MV_STATUS mvFpPppInit(void)
	{
	memset(pppOpen, 0, sizeof(MV_FP_PPP_RULE) * ETH_FP_IFINDEX_MAX);
	memset(pppHalf, 0, sizeof(MV_FP_PPP_RULE) * ETH_FP_IFINDEX_MAX);

	mvOsPrintf("NFP (pppoe) init %d entries, %d bytes\n", ETH_FP_IFINDEX_MAX,
	2 * sizeof(MV_FP_PPP_RULE) * ETH_FP_IFINDEX_MAX);
	return MV_OK;
	}

	/* Clear Fast Route Bridge Rule Database (SNAT + DNAT table) */
	MV_STATUS mvFpPppClear(void)
	{
	memset(pppOpen, 0, sizeof(MV_FP_PPP_RULE) * ETH_FP_IFINDEX_MAX);
	return MV_OK;
	}

	void mvFpPppDestroy(void)
	{
	mvFpPppClear();
	}

	void mvFpPppRulePrint(char text, MV_FP_PPP_RULE rule)
	{
	mvOsPrintf("NFP (pppoe): ppp %s (%s) if_ppp=%u if_eth=%u session=%u DA=" MACFMT " SA=" MACFMT " %x\n",
	text, rule->pppInfo.if_ppp ? "open" : "half",
	rule->pppInfo.if_ppp,
	rule->pppInfo.if_eth,
	rule->pppInfo.u.ppp.session,
	MACSTR(rule->pppInfo.u.ppp.da), MACSTR(rule->pppInfo.u.ppp.sa), rule->pppInfo.channel);
	}

	MV_STATUS mvFpPppRuleSet(MV_FP_PPP_RULE *rule)
	{
	int if_ppp = rule->pppInfo.if_ppp;
	int i = ETH_FP_IFINDEX_MAX;

	#ifdef MV_FP_DEBUG
	mvFpPppRulePrint("new", rule);
	#endif

	/* half open */
	if (!if_ppp) {
	memcpy(&pppHalf[rule->pppInfo.if_eth], rule, sizeof(MV_FP_PPP_RULE));
	} else
	while (i--) {
	/* look for channel id match */
	if (pppHalf[i].pppInfo.channel == rule->pppInfo.channel) {
	memcpy(&pppOpen[if_ppp], &pppHalf[i], sizeof(MV_FP_PPP_RULE));
	memset(&pppHalf[i], 0, sizeof(MV_FP_PPP_RULE));
	pppOpen[if_ppp].pppInfo.if_ppp = if_ppp;
	break;
	}
	}

	return MV_OK;
	}

	MV_STATUS mvFpPppRuleDel(MV_FP_PPP_RULE *rule)
	{
	int i = ETH_FP_IFINDEX_MAX;

	#ifdef MV_FP_DEBUG
	mvOsPrintf("NFP (pppoe): del ppp channel %x\n", rule->pppInfo.channel);
	#endif

	while (i--) {
	if (pppOpen[i].pppInfo.channel == rule->pppInfo.channel) {
	mvFpPppRulePrint("del", &pppOpen[i]);
	pppOpen[i].pppInfo.if_ppp = 0;
	memset(&pppOpen[i], 0, sizeof(MV_FP_PPP_RULE));
	break;
	}
	}

	return MV_OK;
	}

	MV_U32 mvFpPppRuleAge(MV_FP_PPP_RULE *rule)
	{
	return MV_OK;
	}

	MV_STATUS mvFpPppPrint(void)
	{
	int i = ETH_FP_IFINDEX_MAX;

	while (i--) {
	if (pppOpen[i].pppInfo.if_eth)
	mvFpPppRulePrint("", &pppOpen[i]);

	if (pppHalf[i].pppInfo.if_eth)
	mvFpPppRulePrint("", &pppHalf[i]);

	}

	return MV_OK;
	}

	MV_U32 mvFpPppPhyIf(MV_U32 ifIndex)
	{
	if (pppOpen[ifIndex].pppInfo.if_ppp)
	return pppOpen[ifIndex].pppInfo.if_eth;
	return ETH_FP_IFINDEX_MAX;
	}

	/* IP header csum calculation */
	static inline unsigned short from32to16(unsigned long x)
	{
	/* add up 16-bit and 16-bit for 16+c bit */
	x = (x & 0xffff) + (x >> 16);
	/* add up carry.. */
	x = (x & 0xffff) + (x >> 16);
	return x;
	}

	static unsigned long do_csum(char *buff, int len)
	{
	int odd, count;
	unsigned long result = 0;

	if (len <= 0)
	goto out;
	odd = 1 & (unsigned long)buff;
	if (odd) {
	result = *buff;
	len--;
	buff++;
	}
	count = len >> 1; /* nr of 16-bit words.. */
	if (count) {
	if (2 & (unsigned long)buff) {
	result += (unsigned short )buff;
	count--;
	len -= 2;
	buff += 2;
	}
	count >>= 1; /* nr of 32-bit words.. */
	if (count) {
	unsigned long carry = 0;
	do {
	unsigned long w = (unsigned long )buff;
	count--;
	buff += 4;
	result += carry;
	result += w;
	carry = (w > result);
	} while (count);
	result += carry;
	result = (result & 0xffff) + (result >> 16);
	}
	if (len & 2) {
	result += (unsigned short )buff;
	buff += 2;
	}
	}
	if (len & 1)
	result += (*buff << 8);
	result = from32to16(result);
	if (odd)
	result = ((result >> 8) & 0xff) \| ((result & 0xff) << 8);
	out:
	return result;
	}

	static INLINE void mvFpCSumIP(MV_IP_HEADER *pIpHdr)
	{
	pIpHdr->checksum = 0;
	pIpHdr->checksum = ~do_csum((char )pIpHdr, 20 /iph->ihl */);
	}

	static INLINE MV_U32 mvFpPppLookup(MV_U32 ifIndex)
	{
	return pppOpen[ifIndex].pppInfo.if_ppp;
	}

	/* NFP bottom half */
	int mvFpPPPoE(MV_U32 ifIndex, MV_PKT_INFO pPkt, MV_FP_STATS pFpStats)
	{
	MV_U8 *pEth = pPkt->pFrags->bufVirtPtr;
	MV_BUF_INFO *pBuf = pPkt->pFrags;

	MV_NFP_STAT(pFpStats->ppp_tx_esp++);

	/* Encapsulate PPPoE on Tx */
	if (!mvFpPppLookup(ifIndex)) {
	MV_NFP_STAT(pFpStats->ppp_err++);
	return MV_FAIL;
	}

	if (pBuf->dataSize > ETH_FP_PPPOE_MTU) {
	/* Bad, we check size in the mvNfpSecOutgoing() --BK */
	mvOsPrintf("PPPoE oversize %d > %d\n", pBuf->dataSize, ETH_FP_PPPOE_MTU);
	MV_NFP_STAT(pFpStats->ppp_err++);
	return MV_FAIL;
	}

	pBuf->bufAddrShift += ETH_FP_PPPOE_HDR;
	pBuf->bufPhysAddr -= ETH_FP_PPPOE_HDR;
	pBuf->bufVirtPtr -= ETH_FP_PPPOE_HDR;
	pBuf->dataSize += ETH_FP_PPPOE_HDR;
	pEth -= ETH_FP_PPPOE_HDR;

	/* -6B aligment from 32B boundary */
	{
	MV_U32 d = (MV_U32 ) pEth;
	MV_U32 *s = pppOpen[ifIndex].pppInfo.u.u32;

	(d++) = (s++);
	(d++) = (s++);
	(d++) = (s++);
	(d++) = (s++);
	(d++) = (s++);
	(d++) = (s++);
	}

	/* update payload len */
	(MV_U16 ) (pEth + 20) = htons(pBuf->dataSize - 14 - ETH_FP_PPPOE_HDR);

	/* recalculate IP csum in sw */
	mvFpCSumIP((MV_IP_HEADER *) (pEth + 24));
	pPkt->status = 0;

	/* flush two cachelines */
	mvOsCacheLineFlushInv(NULL, pEth);
	mvOsCacheLineFlushInv(NULL, pEth + 32);

	return MV_OK;
	}