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Diffstat (limited to 'drivers/sk98lin/skcsum.c')
| -rw-r--r-- | drivers/sk98lin/skcsum.c | 446 |
1 files changed, 0 insertions, 446 deletions
diff --git a/drivers/sk98lin/skcsum.c b/drivers/sk98lin/skcsum.c deleted file mode 100644 index 60d7e30136..0000000000 --- a/drivers/sk98lin/skcsum.c +++ /dev/null @@ -1,446 +0,0 @@ -/****************************************************************************** - * - * Name: skcsum.c - * Project: GEnesis, PCI Gigabit Ethernet Adapter - * Version: $Revision: 1.10 $ - * Date: $Date: 2002/04/11 10:02:04 $ - * Purpose: Store/verify Internet checksum in send/receive packets. - * - ******************************************************************************/ - -/****************************************************************************** - * - * (C)Copyright 1998-2001 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. - * - ******************************************************************************/ - -/****************************************************************************** - * - * History: - * - * $Log: skcsum.c,v $ - * Revision 1.10 2002/04/11 10:02:04 rwahl - * Fix in SkCsGetSendInfo(): - * - function did not return ProtocolFlags in every case. - * - pseudo header csum calculated wrong for big endian. - * - * Revision 1.9 2001/06/13 07:42:08 gklug - * fix: NetNumber was wrong in CLEAR_STAT event - * add: check for good NetNumber in Clear STAT - * - * Revision 1.8 2001/02/06 11:15:36 rassmann - * Supporting two nets on dual-port adapters. - * - * Revision 1.7 2000/06/29 13:17:05 rassmann - * Corrected reception of a packet with UDP checksum == 0 (which means there - * is no UDP checksum). - * - * Revision 1.6 2000/02/21 12:35:10 cgoos - * Fixed license header comment. - * - * Revision 1.5 2000/02/21 11:05:19 cgoos - * Merged changes back to common source. - * Fixed rx path for BIG ENDIAN architecture. - * - * Revision 1.1 1999/07/26 15:28:12 mkarl - * added return SKCS_STATUS_IP_CSUM_ERROR_UDP and - * SKCS_STATUS_IP_CSUM_ERROR_TCP to pass the NidsTester - * changed from common source to windows specific source - * therefore restarting with v1.0 - * - * Revision 1.3 1999/05/10 08:39:33 mkarl - * prevent overflows in SKCS_HTON16 - * fixed a bug in pseudo header checksum calculation - * added some comments - * - * Revision 1.2 1998/10/22 11:53:28 swolf - * Now using SK_DBG_MSG. - * - * Revision 1.1 1998/09/01 15:35:41 swolf - * initial revision - * - * 13-May-1998 sw Created. - * - ******************************************************************************/ - -#include <config.h> - -#ifdef CONFIG_SK98 - -#ifdef SK_USE_CSUM /* Check if CSUM is to be used. */ - -#ifndef lint -static const char SysKonnectFileId[] = "@(#)" - "$Id: skcsum.c,v 1.10 2002/04/11 10:02:04 rwahl 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 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. - */ - - -/****************************************************************************** - * - * 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 SkCsCalculateChecksum - -/****************************************************************************** - * - * 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 /* SkCsCalculateChecksum */ - -/****************************************************************************** - * - * 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) { - memset(&pAc->Csum.ProtoStats[NetNumber][0], 0, - sizeof(pAc->Csum.ProtoStats[NetNumber])); - } - } - else { /* Clear for individual protocol. */ - memset(&pAc->Csum.ProtoStats[NetNumber][ProtoIndex], 0, - sizeof(pAc->Csum.ProtoStats[NetNumber][ProtoIndex])); - } - break; - default: - break; - } - return (0); /* Success. */ -} /* SkCsEvent */ - -#endif /* SK_USE_CSUM */ - -#endif /* CONFIG_SK98 */ |