+++ /dev/null
-/******************************************************************************
- *
- * 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 */
* "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
projects / linux-2.6-omap-h63xx.git / commitdiff