[PATCH] sk98lin: fix checksumming code

Remove code from sk98lin that does it's own checksum validation.
This code is incorrect when dealing with nested protocols like
VLAN's, and it is better to use regular receive code path to
handle hardware checksum.

Signed-off-by: Stephen Hemminger <[e-mail]>
Signed-off-by: Jeff Garzik <[e-mail]>

drivers/net/sk98lin/Makefile

···
 		sktimer.o	\
 		skvpd.o		\
 		skxmac2.o	\
-		skproc.o	\
-		skcsum.o
+		skproc.o
 
 # DBGDEF =  \
 # -DDEBUG
···
 # SK_DBGCAT_DRV_INT_SRC         0x04000000      interrupts sources
 # SK_DBGCAT_DRV_EVENT           0x08000000      driver events
 
-EXTRA_CFLAGS += -Idrivers/net/sk98lin -DSK_DIAG_SUPPORT -DSK_USE_CSUM -DGENESIS -DYUKON $(DBGDEF) $(SKPARAM)
+EXTRA_CFLAGS += -Idrivers/net/sk98lin -DSK_DIAG_SUPPORT -DGENESIS -DYUKON $(DBGDEF) $(SKPARAM)
 
 clean:
 	rm -f core *.o *.a *.s

drivers/net/sk98lin/h/skdrv2nd.h

···
 	TX_PORT		TxPort[SK_MAX_MACS][2];
 	RX_PORT		RxPort[SK_MAX_MACS];
 
-	unsigned int	CsOfs1;		/* for checksum calculation */
-	unsigned int	CsOfs2;		/* for checksum calculation */
-	SK_U32		CsOfs;		/* for checksum calculation */
-
 	SK_BOOL		CheckQueue;	/* check event queue soon */
 	SK_TIMER        DrvCleanupTimer;/* to check for pending descriptors */
 	DIM_INFO        DynIrqModInfo;  /* all data related to DIM */

drivers/net/sk98lin/skcsum.c

···
-/******************************************************************************
- *
- * Name:	skcsum.c
- * Project:	GEnesis, PCI Gigabit Ethernet Adapter
- * Version:	$Revision: 1.12 $
- * Date:	$Date: 2003/08/20 13:55:53 $
- * Purpose:	Store/verify Internet checksum in send/receive packets.
- *
- ******************************************************************************/
-
-/******************************************************************************
- *
- *	(C)Copyright 1998-2003 SysKonnect GmbH.
- *
- *	This program is free software; you can redistribute it and/or modify
- *	it under the terms of the GNU General Public License as published by
- *	the Free Software Foundation; either version 2 of the License, or
- *	(at your option) any later version.
- *
- *	The information in this file is provided "AS IS" without warranty.
- *
- ******************************************************************************/
-
-#ifdef SK_USE_CSUM	/* Check if CSUM is to be used. */
-
-#ifndef lint
-static const char SysKonnectFileId[] =
-	"@(#) $Id: skcsum.c,v 1.12 2003/08/20 13:55:53 mschmid Exp $ (C) SysKonnect.";
-#endif	/* !lint */
-
-/******************************************************************************
- *
- * Description:
- *
- * This is the "GEnesis" common module "CSUM".
- *
- * This module contains the code necessary to calculate, store, and verify the
- * Internet Checksum of IP, TCP, and UDP frames.
- *
- * "GEnesis" is an abbreviation of "Gigabit Ethernet Network System in Silicon"
- * and is the code name of this SysKonnect project.
- *
- * Compilation Options:
- *
- *	SK_USE_CSUM - Define if CSUM is to be used. Otherwise, CSUM will be an
- *	empty module.
- *
- *	SKCS_OVERWRITE_PROTO - Define to overwrite the default protocol id
- *	definitions. In this case, all SKCS_PROTO_xxx definitions must be made
- *	external.
- *
- *	SKCS_OVERWRITE_STATUS - Define to overwrite the default return status
- *	definitions. In this case, all SKCS_STATUS_xxx definitions must be made
- *	external.
- *
- * Include File Hierarchy:
- *
- *	"h/skdrv1st.h"
- *	"h/skcsum.h"
- *	"h/sktypes.h"
- *	"h/skqueue.h"
- *	"h/skdrv2nd.h"
- *
- ******************************************************************************/
-
-#include "h/skdrv1st.h"
-#include "h/skcsum.h"
-#include "h/skdrv2nd.h"
-
-/* defines ********************************************************************/
-
-/* The size of an Ethernet MAC header. */
-#define SKCS_ETHERNET_MAC_HEADER_SIZE			(6+6+2)
-
-/* The size of the used topology's MAC header. */
-#define	SKCS_MAC_HEADER_SIZE	SKCS_ETHERNET_MAC_HEADER_SIZE
-
-/* The size of the IP header without any option fields. */
-#define SKCS_IP_HEADER_SIZE						20
-
-/*
- * Field offsets within the IP header.
- */
-
-/* "Internet Header Version" and "Length". */
-#define SKCS_OFS_IP_HEADER_VERSION_AND_LENGTH	0
-
-/* "Total Length". */
-#define SKCS_OFS_IP_TOTAL_LENGTH				2
-
-/* "Flags" "Fragment Offset". */
-#define SKCS_OFS_IP_FLAGS_AND_FRAGMENT_OFFSET	6
-
-/* "Next Level Protocol" identifier. */
-#define SKCS_OFS_IP_NEXT_LEVEL_PROTOCOL			9
-
-/* Source IP address. */
-#define SKCS_OFS_IP_SOURCE_ADDRESS				12
-
-/* Destination IP address. */
-#define SKCS_OFS_IP_DESTINATION_ADDRESS			16
-
-
-/*
- * Field offsets within the UDP header.
- */
-
-/* UDP checksum. */
-#define SKCS_OFS_UDP_CHECKSUM					6
-
-/* IP "Next Level Protocol" identifiers (see RFC 790). */
-#define SKCS_PROTO_ID_TCP		6	/* Transport Control Protocol */
-#define SKCS_PROTO_ID_UDP		17	/* User Datagram Protocol */
-
-/* IP "Don't Fragment" bit. */
-#define SKCS_IP_DONT_FRAGMENT	SKCS_HTON16(0x4000)
-
-/* Add a byte offset to a pointer. */
-#define SKCS_IDX(pPtr, Ofs)	((void *) ((char *) (pPtr) + (Ofs)))
-
-/*
- * Macros that convert host to network representation and vice versa, i.e.
- * little/big endian conversion on little endian machines only.
- */
-#ifdef SK_LITTLE_ENDIAN
-#define SKCS_HTON16(Val16)	(((unsigned) (Val16) >> 8) | (((Val16) & 0xff) << 8))
-#endif	/* SK_LITTLE_ENDIAN */
-#ifdef SK_BIG_ENDIAN
-#define SKCS_HTON16(Val16)	(Val16)
-#endif	/* SK_BIG_ENDIAN */
-#define SKCS_NTOH16(Val16)	SKCS_HTON16(Val16)
-
-/* typedefs *******************************************************************/
-
-/* function prototypes ********************************************************/
-
-/******************************************************************************
- *
- *	SkCsGetSendInfo - get checksum information for a send packet
- *
- * Description:
- *	Get all checksum information necessary to send a TCP or UDP packet. The
- *	function checks the IP header passed to it. If the high-level protocol
- *	is either TCP or UDP the pseudo header checksum is calculated and
- *	returned.
- *
- *	The function returns the total length of the IP header (including any
- *	IP option fields), which is the same as the start offset of the IP data
- *	which in turn is the start offset of the TCP or UDP header.
- *
- *	The function also returns the TCP or UDP pseudo header checksum, which
- *	should be used as the start value for the hardware checksum calculation.
- *	(Note that any actual pseudo header checksum can never calculate to
- *	zero.)
- *
- * Note:
- *	There is a bug in the GENESIS ASIC which may lead to wrong checksums.
- *
- * Arguments:
- *	pAc - A pointer to the adapter context struct.
- *
- *	pIpHeader - Pointer to IP header. Must be at least the IP header *not*
- *	including any option fields, i.e. at least 20 bytes.
- *
- *	Note: This pointer will be used to address 8-, 16-, and 32-bit
- *	variables with the respective alignment offsets relative to the pointer.
- *	Thus, the pointer should point to a 32-bit aligned address. If the
- *	target system cannot address 32-bit variables on non 32-bit aligned
- *	addresses, then the pointer *must* point to a 32-bit aligned address.
- *
- *	pPacketInfo - A pointer to the packet information structure for this
- *	packet. Before calling this SkCsGetSendInfo(), the following field must
- *	be initialized:
- *
- *		ProtocolFlags - Initialize with any combination of
- *		SKCS_PROTO_XXX bit flags. SkCsGetSendInfo() will only work on
- *		the protocols specified here. Any protocol(s) not specified
- *		here will be ignored.
- *
- *		Note: Only one checksum can be calculated in hardware. Thus, if
- *		SKCS_PROTO_IP is specified in the 'ProtocolFlags',
- *		SkCsGetSendInfo() must calculate the IP header checksum in
- *		software. It might be a better idea to have the calling
- *		protocol stack calculate the IP header checksum.
- *
- * Returns: N/A
- *	On return, the following fields in 'pPacketInfo' may or may not have
- *	been filled with information, depending on the protocol(s) found in the
- *	packet:
- *
- *	ProtocolFlags - Returns the SKCS_PROTO_XXX bit flags of the protocol(s)
- *	that were both requested by the caller and actually found in the packet.
- *	Protocol(s) not specified by the caller and/or not found in the packet
- *	will have their respective SKCS_PROTO_XXX bit flags reset.
- *
- *	Note: For IP fragments, TCP and UDP packet information is ignored.
- *
- *	IpHeaderLength - The total length in bytes of the complete IP header
- *	including any option fields is returned here. This is the start offset
- *	of the IP data, i.e. the TCP or UDP header if present.
- *
- *	IpHeaderChecksum - If IP has been specified in the 'ProtocolFlags', the
- *	16-bit Internet Checksum of the IP header is returned here. This value
- *	is to be stored into the packet's 'IP Header Checksum' field.
- *
- *	PseudoHeaderChecksum - If this is a TCP or UDP packet and if TCP or UDP
- *	has been specified in the 'ProtocolFlags', the 16-bit Internet Checksum
- *	of the TCP or UDP pseudo header is returned here.
- */
-void SkCsGetSendInfo(
-SK_AC				*pAc,			/* Adapter context struct. */
-void				*pIpHeader,		/* IP header. */
-SKCS_PACKET_INFO	*pPacketInfo,	/* Packet information struct. */
-int					NetNumber)		/* Net number */
-{
-	/* Internet Header Version found in IP header. */
-	unsigned InternetHeaderVersion;
-
-	/* Length of the IP header as found in IP header. */
-	unsigned IpHeaderLength;
-
-	/* Bit field specifiying the desired/found protocols. */
-	unsigned ProtocolFlags;
-
-	/* Next level protocol identifier found in IP header. */
-	unsigned NextLevelProtocol;
-
-	/* Length of IP data portion. */
-	unsigned IpDataLength;
-
-	/* TCP/UDP pseudo header checksum. */
-	unsigned long PseudoHeaderChecksum;
-
-	/* Pointer to next level protocol statistics structure. */
-	SKCS_PROTO_STATS *NextLevelProtoStats;
-
-	/* Temporary variable. */
-	unsigned Tmp;
-
-	Tmp = *(SK_U8 *)
-		SKCS_IDX(pIpHeader, SKCS_OFS_IP_HEADER_VERSION_AND_LENGTH);
-
-	/* Get the Internet Header Version (IHV). */
-	/* Note: The IHV is stored in the upper four bits. */
-
-	InternetHeaderVersion = Tmp >> 4;
-
-	/* Check the Internet Header Version. */
-	/* Note: We currently only support IP version 4. */
-
-	if (InternetHeaderVersion != 4) {	/* IPv4? */
-		SK_DBG_MSG(pAc, SK_DBGMOD_CSUM, SK_DBGCAT_ERR | SK_DBGCAT_TX,
-			("Tx: Unknown Internet Header Version %u.\n",
-			InternetHeaderVersion));
-		pPacketInfo->ProtocolFlags = 0;
-		pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].TxUnableCts++;
-		return;
-	}
-
-	/* Get the IP header length (IHL). */
-	/*
-	 * Note: The IHL is stored in the lower four bits as the number of
-	 * 4-byte words.
-	 */
-
-	IpHeaderLength = (Tmp & 0xf) * 4;
-	pPacketInfo->IpHeaderLength = IpHeaderLength;
-
-	/* Check the IP header length. */
-
-	/* 04-Aug-1998 sw - Really check the IHL? Necessary? */
-
-	if (IpHeaderLength < 5*4) {
-		SK_DBG_MSG(pAc, SK_DBGMOD_CSUM, SK_DBGCAT_ERR | SK_DBGCAT_TX,
-			("Tx: Invalid IP Header Length %u.\n", IpHeaderLength));
-		pPacketInfo->ProtocolFlags = 0;
-		pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].TxUnableCts++;
-		return;
-	}
-
-	/* This is an IPv4 frame with a header of valid length. */
-
-	pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].TxOkCts++;
-
-	/* Check if we should calculate the IP header checksum. */
-
-	ProtocolFlags = pPacketInfo->ProtocolFlags;
-
-	if (ProtocolFlags & SKCS_PROTO_IP) {
-		pPacketInfo->IpHeaderChecksum =
-			SkCsCalculateChecksum(pIpHeader, IpHeaderLength);
-	}
-
-	/* Get the next level protocol identifier. */
-
-	NextLevelProtocol =
-		*(SK_U8 *) SKCS_IDX(pIpHeader, SKCS_OFS_IP_NEXT_LEVEL_PROTOCOL);
-
-	/*
-	 * Check if this is a TCP or UDP frame and if we should calculate the
-	 * TCP/UDP pseudo header checksum.
-	 *
-	 * Also clear all protocol bit flags of protocols not present in the
-	 * frame.
-	 */
-
-	if ((ProtocolFlags & SKCS_PROTO_TCP) != 0 &&
-		NextLevelProtocol == SKCS_PROTO_ID_TCP) {
-		/* TCP/IP frame. */
-		ProtocolFlags &= SKCS_PROTO_TCP | SKCS_PROTO_IP;
-		NextLevelProtoStats =
-			&pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_TCP];
-	}
-	else if ((ProtocolFlags & SKCS_PROTO_UDP) != 0 &&
-		NextLevelProtocol == SKCS_PROTO_ID_UDP) {
-		/* UDP/IP frame. */
-		ProtocolFlags &= SKCS_PROTO_UDP | SKCS_PROTO_IP;
-		NextLevelProtoStats =
-			&pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_UDP];
-	}
-	else {
-		/*
-		 * Either not a TCP or UDP frame and/or TCP/UDP processing not
-		 * specified.
-		 */
-		pPacketInfo->ProtocolFlags = ProtocolFlags & SKCS_PROTO_IP;
-		return;
-	}
-
-	/* Check if this is an IP fragment. */
-
-	/*
-	 * Note: An IP fragment has a non-zero "Fragment Offset" field and/or
-	 * the "More Fragments" bit set. Thus, if both the "Fragment Offset"
-	 * and the "More Fragments" are zero, it is *not* a fragment. We can
-	 * easily check both at the same time since they are in the same 16-bit
-	 * word.
-	 */
-
-	if ((*(SK_U16 *)
-		SKCS_IDX(pIpHeader, SKCS_OFS_IP_FLAGS_AND_FRAGMENT_OFFSET) &
-		~SKCS_IP_DONT_FRAGMENT) != 0) {
-		/* IP fragment; ignore all other protocols. */
-		pPacketInfo->ProtocolFlags = ProtocolFlags & SKCS_PROTO_IP;
-		NextLevelProtoStats->TxUnableCts++;
-		return;
-	}
-
-	/*
-	 * Calculate the TCP/UDP pseudo header checksum.
-	 */
-
-	/* Get total length of IP header and data. */
-
-	IpDataLength =
-		*(SK_U16 *) SKCS_IDX(pIpHeader, SKCS_OFS_IP_TOTAL_LENGTH);
-
-	/* Get length of IP data portion. */
-
-	IpDataLength = SKCS_NTOH16(IpDataLength) - IpHeaderLength;
-
-	/* Calculate the sum of all pseudo header fields (16-bit). */
-
-	PseudoHeaderChecksum =
-		(unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader,
-			SKCS_OFS_IP_SOURCE_ADDRESS + 0) +
-		(unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader,
-			SKCS_OFS_IP_SOURCE_ADDRESS + 2) +
-		(unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader,
-			SKCS_OFS_IP_DESTINATION_ADDRESS + 0) +
-		(unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader,
-			SKCS_OFS_IP_DESTINATION_ADDRESS + 2) +
-		(unsigned long) SKCS_HTON16(NextLevelProtocol) +
-		(unsigned long) SKCS_HTON16(IpDataLength);
-	
-	/* Add-in any carries. */
-
-	SKCS_OC_ADD(PseudoHeaderChecksum, PseudoHeaderChecksum, 0);
-
-	/* Add-in any new carry. */
-
-	SKCS_OC_ADD(pPacketInfo->PseudoHeaderChecksum, PseudoHeaderChecksum, 0);
-
-	pPacketInfo->ProtocolFlags = ProtocolFlags;
-	NextLevelProtoStats->TxOkCts++;	/* Success. */
-}	/* SkCsGetSendInfo */
-
-
-/******************************************************************************
- *
- *	SkCsGetReceiveInfo - verify checksum information for a received packet
- *
- * Description:
- *	Verify a received frame's checksum. The function returns a status code
- *	reflecting the result of the verification.
- *
- * Note:
- *	Before calling this function you have to verify that the frame is
- *	not padded and Checksum1 and Checksum2 are bigger than 1.
- *
- * Arguments:
- *	pAc - Pointer to adapter context struct.
- *
- *	pIpHeader - Pointer to IP header. Must be at least the length in bytes
- *	of the received IP header including any option fields. For UDP packets,
- *	8 additional bytes are needed to access the UDP checksum.
- *
- *	Note: The actual length of the IP header is stored in the lower four
- *	bits of the first octet of the IP header as the number of 4-byte words,
- *	so it must be multiplied by four to get the length in bytes. Thus, the
- *	maximum IP header length is 15 * 4 = 60 bytes.
- *
- *	Checksum1 - The first 16-bit Internet Checksum calculated by the
- *	hardware starting at the offset returned by SkCsSetReceiveFlags().
- *
- *	Checksum2 - The second 16-bit Internet Checksum calculated by the
- *	hardware starting at the offset returned by SkCsSetReceiveFlags().
- *
- * Returns:
- *	SKCS_STATUS_UNKNOWN_IP_VERSION - Not an IP v4 frame.
- *	SKCS_STATUS_IP_CSUM_ERROR - IP checksum error.
- *	SKCS_STATUS_IP_CSUM_ERROR_TCP - IP checksum error in TCP frame.
- *	SKCS_STATUS_IP_CSUM_ERROR_UDP - IP checksum error in UDP frame
- *	SKCS_STATUS_IP_FRAGMENT - IP fragment (IP checksum ok).
- *	SKCS_STATUS_IP_CSUM_OK - IP checksum ok (not a TCP or UDP frame).
- *	SKCS_STATUS_TCP_CSUM_ERROR - TCP checksum error (IP checksum ok).
- *	SKCS_STATUS_UDP_CSUM_ERROR - UDP checksum error (IP checksum ok).
- *	SKCS_STATUS_TCP_CSUM_OK - IP and TCP checksum ok.
- *	SKCS_STATUS_UDP_CSUM_OK - IP and UDP checksum ok.
- *	SKCS_STATUS_IP_CSUM_OK_NO_UDP - IP checksum OK and no UDP checksum.
- *
- *	Note: If SKCS_OVERWRITE_STATUS is defined, the SKCS_STATUS_XXX values
- *	returned here can be defined in some header file by the module using CSUM.
- *	In this way, the calling module can assign return values for its own needs,
- *	e.g. by assigning bit flags to the individual protocols.
- */
-SKCS_STATUS SkCsGetReceiveInfo(
-SK_AC		*pAc,		/* Adapter context struct. */
-void		*pIpHeader,	/* IP header. */
-unsigned	Checksum1,	/* Hardware checksum 1. */
-unsigned	Checksum2,	/* Hardware checksum 2. */
-int			NetNumber)	/* Net number */
-{
-	/* Internet Header Version found in IP header. */
-	unsigned InternetHeaderVersion;
-
-	/* Length of the IP header as found in IP header. */
-	unsigned IpHeaderLength;
-
-	/* Length of IP data portion. */
-	unsigned IpDataLength;
-
-	/* IP header checksum. */
-	unsigned IpHeaderChecksum;
-
-	/* IP header options checksum, if any. */
-	unsigned IpOptionsChecksum;
-
-	/* IP data checksum, i.e. TCP/UDP checksum. */
-	unsigned IpDataChecksum;
-
-	/* Next level protocol identifier found in IP header. */
-	unsigned NextLevelProtocol;
-
-	/* The checksum of the "next level protocol", i.e. TCP or UDP. */
-	unsigned long NextLevelProtocolChecksum;
-
-	/* Pointer to next level protocol statistics structure. */
-	SKCS_PROTO_STATS *NextLevelProtoStats;
-
-	/* Temporary variable. */
-	unsigned Tmp;
-
-	Tmp = *(SK_U8 *)
-		SKCS_IDX(pIpHeader, SKCS_OFS_IP_HEADER_VERSION_AND_LENGTH);
-
-	/* Get the Internet Header Version (IHV). */
-	/* Note: The IHV is stored in the upper four bits. */
-
-	InternetHeaderVersion = Tmp >> 4;
-
-	/* Check the Internet Header Version. */
-	/* Note: We currently only support IP version 4. */
-
-	if (InternetHeaderVersion != 4) {	/* IPv4? */
-		SK_DBG_MSG(pAc, SK_DBGMOD_CSUM, SK_DBGCAT_ERR | SK_DBGCAT_RX,
-			("Rx: Unknown Internet Header Version %u.\n",
-			InternetHeaderVersion));
-		pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].RxUnableCts++;
-		return (SKCS_STATUS_UNKNOWN_IP_VERSION);
-	}
-
-	/* Get the IP header length (IHL). */
-	/*
-	 * Note: The IHL is stored in the lower four bits as the number of
-	 * 4-byte words.
-	 */
-
-	IpHeaderLength = (Tmp & 0xf) * 4;
-
-	/* Check the IP header length. */
-
-	/* 04-Aug-1998 sw - Really check the IHL? Necessary? */
-
-	if (IpHeaderLength < 5*4) {
-		SK_DBG_MSG(pAc, SK_DBGMOD_CSUM, SK_DBGCAT_ERR | SK_DBGCAT_RX,
-			("Rx: Invalid IP Header Length %u.\n", IpHeaderLength));
-		pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].RxErrCts++;
-		return (SKCS_STATUS_IP_CSUM_ERROR);
-	}
-
-	/* This is an IPv4 frame with a header of valid length. */
-
-	/* Get the IP header and data checksum. */
-
-	IpDataChecksum = Checksum2;
-
-	/*
-	 * The IP header checksum is calculated as follows:
-	 *
-	 *	IpHeaderChecksum = Checksum1 - Checksum2
-	 */
-
-	SKCS_OC_SUB(IpHeaderChecksum, Checksum1, Checksum2);
-
-	/* Check if any IP header options. */
-
-	if (IpHeaderLength > SKCS_IP_HEADER_SIZE) {
-
-		/* Get the IP options checksum. */
-
-		IpOptionsChecksum = SkCsCalculateChecksum(
-			SKCS_IDX(pIpHeader, SKCS_IP_HEADER_SIZE),
-			IpHeaderLength - SKCS_IP_HEADER_SIZE);
-
-		/* Adjust the IP header and IP data checksums. */
-
-		SKCS_OC_ADD(IpHeaderChecksum, IpHeaderChecksum, IpOptionsChecksum);
-
-		SKCS_OC_SUB(IpDataChecksum, IpDataChecksum, IpOptionsChecksum);
-	}
-
-	/*
-	 * Check if the IP header checksum is ok.
-	 *
-	 * NOTE: We must check the IP header checksum even if the caller just wants
-	 * us to check upper-layer checksums, because we cannot do any further
-	 * processing of the packet without a valid IP checksum.
-	 */
-	
-	/* Get the next level protocol identifier. */
-	
-	NextLevelProtocol = *(SK_U8 *)
-		SKCS_IDX(pIpHeader, SKCS_OFS_IP_NEXT_LEVEL_PROTOCOL);
-
-	if (IpHeaderChecksum != 0xffff) {
-		pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].RxErrCts++;
-		/* the NDIS tester wants to know the upper level protocol too */
-		if (NextLevelProtocol == SKCS_PROTO_ID_TCP) {
-			return(SKCS_STATUS_IP_CSUM_ERROR_TCP);
-		}
-		else if (NextLevelProtocol == SKCS_PROTO_ID_UDP) {
-			return(SKCS_STATUS_IP_CSUM_ERROR_UDP);
-		}
-		return (SKCS_STATUS_IP_CSUM_ERROR);
-	}
-
-	/*
-	 * Check if this is a TCP or UDP frame and if we should calculate the
-	 * TCP/UDP pseudo header checksum.
-	 *
-	 * Also clear all protocol bit flags of protocols not present in the
-	 * frame.
-	 */
-
-	if ((pAc->Csum.ReceiveFlags[NetNumber] & SKCS_PROTO_TCP) != 0 &&
-		NextLevelProtocol == SKCS_PROTO_ID_TCP) {
-		/* TCP/IP frame. */
-		NextLevelProtoStats =
-			&pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_TCP];
-	}
-	else if ((pAc->Csum.ReceiveFlags[NetNumber] & SKCS_PROTO_UDP) != 0 &&
-		NextLevelProtocol == SKCS_PROTO_ID_UDP) {
-		/* UDP/IP frame. */
-		NextLevelProtoStats =
-			&pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_UDP];
-	}
-	else {
-		/*
-		 * Either not a TCP or UDP frame and/or TCP/UDP processing not
-		 * specified.
-		 */
-		return (SKCS_STATUS_IP_CSUM_OK);
-	}
-
-	/* Check if this is an IP fragment. */
-
-	/*
-	 * Note: An IP fragment has a non-zero "Fragment Offset" field and/or
-	 * the "More Fragments" bit set. Thus, if both the "Fragment Offset"
-	 * and the "More Fragments" are zero, it is *not* a fragment. We can
-	 * easily check both at the same time since they are in the same 16-bit
-	 * word.
-	 */
-
-	if ((*(SK_U16 *)
-		SKCS_IDX(pIpHeader, SKCS_OFS_IP_FLAGS_AND_FRAGMENT_OFFSET) &
-		~SKCS_IP_DONT_FRAGMENT) != 0) {
-		/* IP fragment; ignore all other protocols. */
-		NextLevelProtoStats->RxUnableCts++;
-		return (SKCS_STATUS_IP_FRAGMENT);
-	}
-
-	/*
-	 * 08-May-2000 ra
-	 *
-	 * From RFC 768 (UDP)
-	 * If the computed checksum is zero, it is transmitted as all ones (the
-	 * equivalent in one's complement arithmetic).  An all zero transmitted
-	 * checksum value means that the transmitter generated no checksum (for
-	 * debugging or for higher level protocols that don't care).
-	 */
-
-	if (NextLevelProtocol == SKCS_PROTO_ID_UDP &&
-		*(SK_U16*)SKCS_IDX(pIpHeader, IpHeaderLength + 6) == 0x0000) {
-
-		NextLevelProtoStats->RxOkCts++;
-		
-		return (SKCS_STATUS_IP_CSUM_OK_NO_UDP);
-	}
-
-	/*
-	 * Calculate the TCP/UDP checksum.
-	 */
-
-	/* Get total length of IP header and data. */
-
-	IpDataLength =
-		*(SK_U16 *) SKCS_IDX(pIpHeader, SKCS_OFS_IP_TOTAL_LENGTH);
-
-	/* Get length of IP data portion. */
-
-	IpDataLength = SKCS_NTOH16(IpDataLength) - IpHeaderLength;
-
-	NextLevelProtocolChecksum =
-
-		/* Calculate the pseudo header checksum. */
-
-		(unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader,
-			SKCS_OFS_IP_SOURCE_ADDRESS + 0) +
-		(unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader,
-			SKCS_OFS_IP_SOURCE_ADDRESS + 2) +
-		(unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader,
-			SKCS_OFS_IP_DESTINATION_ADDRESS + 0) +
-		(unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader,
-			SKCS_OFS_IP_DESTINATION_ADDRESS + 2) +
-		(unsigned long) SKCS_HTON16(NextLevelProtocol) +
-		(unsigned long) SKCS_HTON16(IpDataLength) +
-
-		/* Add the TCP/UDP header checksum. */
-
-		(unsigned long) IpDataChecksum;
-
-	/* Add-in any carries. */
-
-	SKCS_OC_ADD(NextLevelProtocolChecksum, NextLevelProtocolChecksum, 0);
-
-	/* Add-in any new carry. */
-
-	SKCS_OC_ADD(NextLevelProtocolChecksum, NextLevelProtocolChecksum, 0);
-
-	/* Check if the TCP/UDP checksum is ok. */
-
-	if ((unsigned) NextLevelProtocolChecksum == 0xffff) {
-
-		/* TCP/UDP checksum ok. */
-
-		NextLevelProtoStats->RxOkCts++;
-
-		return (NextLevelProtocol == SKCS_PROTO_ID_TCP ?
-			SKCS_STATUS_TCP_CSUM_OK : SKCS_STATUS_UDP_CSUM_OK);
-	}
-	
-	/* TCP/UDP checksum error. */
-
-	NextLevelProtoStats->RxErrCts++;
-
-	return (NextLevelProtocol == SKCS_PROTO_ID_TCP ?
-		SKCS_STATUS_TCP_CSUM_ERROR : SKCS_STATUS_UDP_CSUM_ERROR);
-}	/* SkCsGetReceiveInfo */
-
-
-/******************************************************************************
- *
- *	SkCsSetReceiveFlags - set checksum receive flags
- *
- * Description:
- *	Use this function to set the various receive flags. According to the
- *	protocol flags set by the caller, the start offsets within received
- *	packets of the two hardware checksums are returned. These offsets must
- *	be stored in all receive descriptors.
- *
- * Arguments:
- *	pAc - Pointer to adapter context struct.
- *
- *	ReceiveFlags - Any combination of SK_PROTO_XXX flags of the protocols
- *	for which the caller wants checksum information on received frames.
- *
- *	pChecksum1Offset - The start offset of the first receive descriptor
- *	hardware checksum to be calculated for received frames is returned
- *	here.
- *
- *	pChecksum2Offset - The start offset of the second receive descriptor
- *	hardware checksum to be calculated for received frames is returned
- *	here.
- *
- * Returns: N/A
- *	Returns the two hardware checksum start offsets.
- */
-void SkCsSetReceiveFlags(
-SK_AC		*pAc,				/* Adapter context struct. */
-unsigned	ReceiveFlags,		/* New receive flags. */
-unsigned	*pChecksum1Offset,	/* Offset for hardware checksum 1. */
-unsigned	*pChecksum2Offset,	/* Offset for hardware checksum 2. */
-int			NetNumber)
-{
-	/* Save the receive flags. */
-
-	pAc->Csum.ReceiveFlags[NetNumber] = ReceiveFlags;
-
-	/* First checksum start offset is the IP header. */
-	*pChecksum1Offset = SKCS_MAC_HEADER_SIZE;
-
-	/*
-	 * Second checksum start offset is the IP data. Note that this may vary
-	 * if there are any IP header options in the actual packet.
-	 */
-	*pChecksum2Offset = SKCS_MAC_HEADER_SIZE + SKCS_IP_HEADER_SIZE;
-}	/* SkCsSetReceiveFlags */
-
-#ifndef SK_CS_CALCULATE_CHECKSUM
-
-/******************************************************************************
- *
- *	SkCsCalculateChecksum - calculate checksum for specified data
- *
- * Description:
- *	Calculate and return the 16-bit Internet Checksum for the specified
- *	data.
- *
- * Arguments:
- *	pData - Pointer to data for which the checksum shall be calculated.
- *	Note: The pointer should be aligned on a 16-bit boundary.
- *
- *	Length - Length in bytes of data to checksum.
- *
- * Returns:
- *	The 16-bit Internet Checksum for the specified data.
- *
- *	Note: The checksum is calculated in the machine's natural byte order,
- *	i.e. little vs. big endian. Thus, the resulting checksum is different
- *	for the same input data on little and big endian machines.
- *
- *	However, when written back to the network packet, the byte order is
- *	always in correct network order.
- */
-unsigned SkCsCalculateChecksum(
-void		*pData,		/* Data to checksum. */
-unsigned	Length)		/* Length of data. */
-{
-	SK_U16 *pU16;		/* Pointer to the data as 16-bit words. */
-	unsigned long Checksum;	/* Checksum; must be at least 32 bits. */
-
-	/* Sum up all 16-bit words. */
-
-	pU16 = (SK_U16 *) pData;
-	for (Checksum = 0; Length > 1; Length -= 2) {
-		Checksum += *pU16++;
-	}
-
-	/* If this is an odd number of bytes, add-in the last byte. */
-
-	if (Length > 0) {
-#ifdef SK_BIG_ENDIAN
-		/* Add the last byte as the high byte. */
-		Checksum += ((unsigned) *(SK_U8 *) pU16) << 8;
-#else	/* !SK_BIG_ENDIAN */
-		/* Add the last byte as the low byte. */
-		Checksum += *(SK_U8 *) pU16;
-#endif	/* !SK_BIG_ENDIAN */
-	}
-
-	/* Add-in any carries. */
-
-	SKCS_OC_ADD(Checksum, Checksum, 0);
-
-	/* Add-in any new carry. */
-
-	SKCS_OC_ADD(Checksum, Checksum, 0);
-
-	/* Note: All bits beyond the 16-bit limit are now zero. */
-
-	return ((unsigned) Checksum);
-}	/* SkCsCalculateChecksum */
-
-#endif /* SK_CS_CALCULATE_CHECKSUM */
-
-/******************************************************************************
- *
- *	SkCsEvent - the CSUM event dispatcher
- *
- * Description:
- *	This is the event handler for the CSUM module.
- *
- * Arguments:
- *	pAc - Pointer to adapter context.
- *
- *	Ioc - I/O context.
- *
- *	Event -	 Event id.
- *
- *	Param - Event dependent parameter.
- *
- * Returns:
- *	The 16-bit Internet Checksum for the specified data.
- *
- *	Note: The checksum is calculated in the machine's natural byte order,
- *	i.e. little vs. big endian. Thus, the resulting checksum is different
- *	for the same input data on little and big endian machines.
- *
- *	However, when written back to the network packet, the byte order is
- *	always in correct network order.
- */
-int SkCsEvent(
-SK_AC		*pAc,	/* Pointer to adapter context. */
-SK_IOC		Ioc,	/* I/O context. */
-SK_U32		Event,	/* Event id. */
-SK_EVPARA	Param)	/* Event dependent parameter. */
-{
-	int ProtoIndex;
-	int	NetNumber;
-
-	switch (Event) {
-	/*
-	 * Clear protocol statistics.
-	 *
-	 * Param - Protocol index, or -1 for all protocols.
-	 *		 - Net number.
-	 */
-	case SK_CSUM_EVENT_CLEAR_PROTO_STATS:
-
-		ProtoIndex = (int)Param.Para32[1];
-		NetNumber = (int)Param.Para32[0];
-		if (ProtoIndex < 0) {	/* Clear for all protocols. */
-			if (NetNumber >= 0) {
-				SK_MEMSET(&pAc->Csum.ProtoStats[NetNumber][0], 0,
-					sizeof(pAc->Csum.ProtoStats[NetNumber]));
-			}
-		}
-		else {					/* Clear for individual protocol. */
-			SK_MEMSET(&pAc->Csum.ProtoStats[NetNumber][ProtoIndex], 0,
-				sizeof(pAc->Csum.ProtoStats[NetNumber][ProtoIndex]));
-		}
-		break;
-	default:
-		break;
-	}
-	return (0);	/* Success. */
-}	/* SkCsEvent */
-
-#endif	/* SK_USE_CSUM */

drivers/net/sk98lin/skge.c

···
  *		"h/skgeinit.h"
  *		"h/skaddr.h"
  *		"h/skgesirq.h"
- *		"h/skcsum.h"
  *		"h/skrlmt.h"
  *
  ******************************************************************************/
···
 #include	<linux/init.h>
 #include 	<linux/proc_fs.h>
 #include	<linux/dma-mapping.h>
+#include	<linux/ip.h>
 
 #include	"h/skdrv1st.h"
 #include	"h/skdrv2nd.h"
···
        		return(-EAGAIN);
 	}
 
-	SkCsSetReceiveFlags(pAC,
-		SKCS_PROTO_IP | SKCS_PROTO_TCP | SKCS_PROTO_UDP,
-		&pAC->CsOfs1, &pAC->CsOfs2, 0);
-	pAC->CsOfs = (pAC->CsOfs2 << 16) | pAC->CsOfs1;
-
 	BoardInitMem(pAC);
 	/* tschilling: New common function with minimum size check. */
 	DualNet = SK_FALSE;
···
 		/* set the pointers right */
 		pDescr->VNextRxd = VNextDescr & 0xffffffffULL;
 		pDescr->pNextRxd = pNextDescr;
-		pDescr->TcpSumStarts = pAC->CsOfs;
+		pDescr->TcpSumStarts = 0;
 
 		/* advance one step */
 		pPrevDescr = pDescr;
···
 	TXD		*pOldTxd;
 	unsigned long	 Flags;
 	SK_U64		 PhysAddr;
-	int	 	 Protocol;
-	int		 IpHeaderLength;
 	int		 BytesSend = pMessage->len;
 
 	SK_DBG_MSG(NULL, SK_DBGMOD_DRV, SK_DBGCAT_DRV_TX_PROGRESS, ("X"));
···
 	pTxd->pMBuf     = pMessage;
 
 	if (pMessage->ip_summed == CHECKSUM_HW) {
-		Protocol = ((SK_U8)pMessage->data[C_OFFSET_IPPROTO] & 0xff);
-		if ((Protocol == C_PROTO_ID_UDP) && 
+		u16 hdrlen = pMessage->h.raw - pMessage->data;
+		u16 offset = hdrlen + pMessage->csum;
+
+		if ((pMessage->h.ipiph->protocol == IPPROTO_UDP ) &&
 			(pAC->GIni.GIChipRev == 0) &&
 			(pAC->GIni.GIChipId == CHIP_ID_YUKON)) {
 			pTxd->TBControl = BMU_TCP_CHECK;
···
 			pTxd->TBControl = BMU_UDP_CHECK;
 		}
 
-		IpHeaderLength  = (SK_U8)pMessage->data[C_OFFSET_IPHEADER];
-		IpHeaderLength  = (IpHeaderLength & 0xf) * 4;
-		pTxd->TcpSumOfs = 0; /* PH-Checksum already calculated */
-		pTxd->TcpSumSt  = C_LEN_ETHERMAC_HEADER + IpHeaderLength + 
-							(Protocol == C_PROTO_ID_UDP ?
-							C_OFFSET_UDPHEADER_UDPCS : 
-							C_OFFSET_TCPHEADER_TCPCS);
-		pTxd->TcpSumWr  = C_LEN_ETHERMAC_HEADER + IpHeaderLength;
+		pTxd->TcpSumOfs = 0;
+		pTxd->TcpSumSt  = hdrlen;
+		pTxd->TcpSumWr  = offset;
 
 		pTxd->TBControl |= BMU_OWN | BMU_STF | 
 				   BMU_SW  | BMU_EOF |
···
 	TXD		*pTxdLst;
 	int 	 	 CurrFrag;
 	int		 BytesSend;
-	int		 IpHeaderLength; 
-	int		 Protocol;
 	skb_frag_t	*sk_frag;
 	SK_U64		 PhysAddr;
 	unsigned long	 Flags;
+	SK_U32		 Control;
 
 	spin_lock_irqsave(&pTxPort->TxDesRingLock, Flags);
 #ifndef USE_TX_COMPLETE
···
 	pTxdFst   = pTxd;
 	pTxdLst   = pTxd;
 	BytesSend = 0;
-	Protocol  = 0;
 
 	/* 
 	** Map the first fragment (header) into the DMA-space
···
 	** Does the HW need to evaluate checksum for TCP or UDP packets? 
 	*/
 	if (pMessage->ip_summed == CHECKSUM_HW) {
-		pTxd->TBControl = BMU_STF | BMU_STFWD | skb_headlen(pMessage);
+		u16 hdrlen = pMessage->h.raw - pMessage->data;
+		u16 offset = hdrlen + pMessage->csum;
+
+		Control = BMU_STFWD;
+
 		/* 
 		** We have to use the opcode for tcp here,  because the
 		** opcode for udp is not working in the hardware yet 
 		** (Revision 2.0)
 		*/
-		Protocol = ((SK_U8)pMessage->data[C_OFFSET_IPPROTO] & 0xff);
-		if ((Protocol == C_PROTO_ID_UDP) && 
+		if ((pMessage->h.ipiph->protocol == IPPROTO_UDP ) &&
 			(pAC->GIni.GIChipRev == 0) &&
 			(pAC->GIni.GIChipId == CHIP_ID_YUKON)) {
-			pTxd->TBControl |= BMU_TCP_CHECK;
+			Control |= BMU_TCP_CHECK;
 		} else {
-			pTxd->TBControl |= BMU_UDP_CHECK;
+			Control |= BMU_UDP_CHECK;
 		}
 
-		IpHeaderLength  = ((SK_U8)pMessage->data[C_OFFSET_IPHEADER] & 0xf)*4;
-		pTxd->TcpSumOfs = 0; /* PH-Checksum already claculated */
-		pTxd->TcpSumSt  = C_LEN_ETHERMAC_HEADER + IpHeaderLength +
-						(Protocol == C_PROTO_ID_UDP ?
-						C_OFFSET_UDPHEADER_UDPCS :
-						C_OFFSET_TCPHEADER_TCPCS);
-		pTxd->TcpSumWr  = C_LEN_ETHERMAC_HEADER + IpHeaderLength;
-	} else {
-		pTxd->TBControl = BMU_CHECK | BMU_SW | BMU_STF |
-					skb_headlen(pMessage);
-	}
+		pTxd->TcpSumOfs = 0;
+		pTxd->TcpSumSt  = hdrlen;
+		pTxd->TcpSumWr  = offset;
+	} else
+		Control = BMU_CHECK | BMU_SW;
+
+	pTxd->TBControl = BMU_STF | Control | skb_headlen(pMessage);
 
 	pTxd = pTxd->pNextTxd;
 	pTxPort->TxdRingFree--;
···
 		pTxd->VDataHigh = (SK_U32) (PhysAddr >> 32);
 		pTxd->pMBuf     = pMessage;
 		
-		/* 
-		** Does the HW need to evaluate checksum for TCP or UDP packets? 
-		*/
-		if (pMessage->ip_summed == CHECKSUM_HW) {
-			pTxd->TBControl = BMU_OWN | BMU_SW | BMU_STFWD;
-			/* 
-			** We have to use the opcode for tcp here because the 
-			** opcode for udp is not working in the hardware yet 
-			** (revision 2.0)
-			*/
-			if ((Protocol == C_PROTO_ID_UDP) && 
-				(pAC->GIni.GIChipRev == 0) &&
-				(pAC->GIni.GIChipId == CHIP_ID_YUKON)) {
-				pTxd->TBControl |= BMU_TCP_CHECK;
-			} else {
-				pTxd->TBControl |= BMU_UDP_CHECK;
-			}
-		} else {
-			pTxd->TBControl = BMU_CHECK | BMU_SW | BMU_OWN;
-		}
+		pTxd->TBControl = Control | BMU_OWN | sk_frag->size;;
 
 		/* 
 		** Do we have the last fragment? 
 		*/
 		if( (CurrFrag+1) == skb_shinfo(pMessage)->nr_frags )  {
 #ifdef USE_TX_COMPLETE
-			pTxd->TBControl |= BMU_EOF | BMU_IRQ_EOF | sk_frag->size;
+			pTxd->TBControl |= BMU_EOF | BMU_IRQ_EOF;
 #else
-			pTxd->TBControl |= BMU_EOF | sk_frag->size;
+			pTxd->TBControl |= BMU_EOF;
 #endif
 			pTxdFst->TBControl |= BMU_OWN | BMU_SW;
-
-		} else {
-			pTxd->TBControl |= sk_frag->size;
 		}
 		pTxdLst = pTxd;
 		pTxd    = pTxd->pNextTxd;
···
 struct sk_buff	*pMsg;			/* pointer to message holding frame */
 struct sk_buff	*pNewMsg;		/* pointer to a new message for copying frame */
 int				FrameLength;	/* total length of received frame */
-int				IpFrameLength;
 SK_MBUF			*pRlmtMbuf;		/* ptr to a buffer for giving a frame to rlmt */
 SK_EVPARA		EvPara;			/* an event parameter union */	
 unsigned long	Flags;			/* for spin lock */
···
 SK_BOOL  IsBadFrame; 			/* Bad frame */
 
 SK_U32			FrameStat;
-unsigned short	Csum1;
-unsigned short	Csum2;
-unsigned short	Type;
-int				Result;
 SK_U64			PhysAddr;
 
 rx_start:	
···
 						    (dma_addr_t) PhysAddr,
 						    FrameLength,
 						    PCI_DMA_FROMDEVICE);
-			eth_copy_and_sum(pNewMsg, pMsg->data,
-				FrameLength, 0);
+			memcpy(pNewMsg->data, pMsg, FrameLength);
+
 			pci_dma_sync_single_for_device(pAC->PciDev,
 						       (dma_addr_t) PhysAddr,
 						       FrameLength,
···
 
 			/* set length in message */
 			skb_put(pMsg, FrameLength);
-			/* hardware checksum */
-			Type = ntohs(*((short*)&pMsg->data[12]));
+		} /* frame > SK_COPY_TRESHOLD */
 
 #ifdef USE_SK_RX_CHECKSUM
-			if (Type == 0x800) {
-				Csum1=le16_to_cpu(pRxd->TcpSums & 0xffff);
-				Csum2=le16_to_cpu((pRxd->TcpSums >> 16) & 0xffff);
-				IpFrameLength = (int) ntohs((unsigned short)
-								((unsigned short *) pMsg->data)[8]);
-
-				/*
-				 * Test: If frame is padded, a check is not possible!
-				 * Frame not padded? Length difference must be 14 (0xe)!
-				 */
-				if ((FrameLength - IpFrameLength) != 0xe) {
-				/* Frame padded => TCP offload not possible! */
-					pMsg->ip_summed = CHECKSUM_NONE;
-				} else {
-				/* Frame not padded => TCP offload! */
-					if ((((Csum1 & 0xfffe) && (Csum2 & 0xfffe)) &&
-						(pAC->GIni.GIChipId == CHIP_ID_GENESIS)) ||
-						(pAC->ChipsetType)) {
-						Result = SkCsGetReceiveInfo(pAC,
-							&pMsg->data[14],
-							Csum1, Csum2, pRxPort->PortIndex);
-						if (Result ==
-							SKCS_STATUS_IP_FRAGMENT ||
-							Result ==
-							SKCS_STATUS_IP_CSUM_OK ||
-							Result ==
-							SKCS_STATUS_TCP_CSUM_OK ||
-							Result ==
-							SKCS_STATUS_UDP_CSUM_OK) {
-								pMsg->ip_summed =
-								CHECKSUM_UNNECESSARY;
-						}
-						else if (Result ==
-							SKCS_STATUS_TCP_CSUM_ERROR ||
-							Result ==
-							SKCS_STATUS_UDP_CSUM_ERROR ||
-							Result ==
-							SKCS_STATUS_IP_CSUM_ERROR_UDP ||
-							Result ==
-							SKCS_STATUS_IP_CSUM_ERROR_TCP ||
-							Result ==
-							SKCS_STATUS_IP_CSUM_ERROR ) {
-							/* HW Checksum error */
-							SK_DBG_MSG(NULL, SK_DBGMOD_DRV,
-							SK_DBGCAT_DRV_RX_PROGRESS,
-							("skge: CRC error. Frame dropped!\n"));
-							goto rx_failed;
-						} else {
-								pMsg->ip_summed =
-								CHECKSUM_NONE;
-						}
-					}/* checksumControl calculation valid */
-				} /* Frame length check */
-			} /* IP frame */
+		pMsg->csum = pRxd->TcpSums;
+		pMsg->ip_summed = CHECKSUM_HW;
 #else
-			pMsg->ip_summed = CHECKSUM_NONE;	
+		pMsg->ip_summed = CHECKSUM_NONE;
 #endif
-		} /* frame > SK_COPY_TRESHOLD */
-		
+
+
 		SK_DBG_MSG(NULL, SK_DBGMOD_DRV,	1,("V"));
 		ForRlmt = SK_RLMT_RX_PROTOCOL;
 #if 0