ixethdbcore.c

有关ARM开发板上的IXP400网络驱动程序的源码以。

/**
 * @file IxEthDBDBCore.c
 *
 * @brief Database support functions
 * 
 * @par
 * IXP400 SW Release version 2.1
 * 
 * -- Copyright Notice --
 * 
 * @par
 * Copyright (c) 2001-2005, Intel Corporation.
 * All rights reserved.
 * 
 * @par
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the Intel Corporation nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * 
 * @par
 * 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.
 * 
 * 
 * @par
 * -- End of Copyright Notice --
 */

#include "IxEthDB_p.h"

/* list of database hashtables */
IX_ETH_DB_PUBLIC HashTable dbHashtable;
IX_ETH_DB_PUBLIC MatchFunction matchFunctions[IX_ETH_DB_MAX_KEY_INDEX + 1];
IX_ETH_DB_PUBLIC BOOL ixEthDBPortUpdateRequired[IX_ETH_DB_MAX_RECORD_TYPE_INDEX + 1];
IX_ETH_DB_PUBLIC UINT32 ixEthDBKeyType[IX_ETH_DB_MAX_RECORD_TYPE_INDEX + 1];

/* private initialization flag */
IX_ETH_DB_PRIVATE BOOL ethDBInitializationComplete = FALSE;
        
/**
 * @brief initializes EthDB
 *
 * This function must be called to initialize the component.
 *
 * It does the following things:
 * - checks the port definition structure
 * - scans the capabilities of the NPE images and sets the
 *   capabilities of the ports accordingly
 * - initializes the memory pools internally used in EthDB
 *   for storing database records and handling data
 * - registers automatic update handlers for add and remove
 *   operations
 * - registers hashing match functions, depending on key sets
 * - initializes the main database hashtable
 * - allocates contiguous memory zones to be used for NPE
 *   updates
 * - registers the serialize methods used to convert data
 *   into NPE-readable format
 * - starts the event processor
 *
 * Note that this function is documented in the public
 * component header file, IxEthDB.h.
 *
 * @return IX_ETH_DB_SUCCESS or an appropriate error if the
 * component failed to initialize correctly
 */
IX_ETH_DB_PUBLIC
IxEthDBStatus ixEthDBInit(void)
{
    IxEthDBStatus result;

    if (ethDBInitializationComplete)
    {
        /* redundant */
        return IX_ETH_DB_SUCCESS;
    }

    /* trap an invalid port definition structure */
    IX_ETH_DB_PORTS_ASSERTION;
    
    /* memory management */
    ixEthDBInitMemoryPools();
    
    /* register hashing search methods */
    ixEthDBMatchMethodsRegister(matchFunctions);
    
    /* register type-based automatic port updates */
    ixEthDBUpdateTypeRegister(ixEthDBPortUpdateRequired);

    /* register record to key type mappings */
    ixEthDBKeyTypeRegister(ixEthDBKeyType);
    
    /* hash table */
    ixEthDBInitHash(&dbHashtable, NUM_BUCKETS, ixEthDBEntryXORHash, matchFunctions, (FreeFunction) ixEthDBFreeMacDescriptor);
    
    /* NPE update zones */
    ixEthDBNPEUpdateAreasInit();
    
    /* register record serialization methods */
    ixEthDBRecordSerializeMethodsRegister();
    
    /* start the event processor */
    result = ixEthDBEventProcessorInit();

    /* scan NPE features */
    if (result == IX_ETH_DB_SUCCESS)
    {
        ixEthDBFeatureCapabilityScan();
    }

    ethDBInitializationComplete = TRUE;

    return result;
}

/**
 * @brief prepares EthDB for unloading
 *
 * This function must be called before removing the
 * EthDB component from memory (e.g. doing rmmod in 
 * Linux) if the component is to be re-initialized again
 * without rebooting the platform.
 *
 * All the EthDB ports must be disabled before this 
 * function is to be called. Failure to disable all
 * the ports will return the IX_ETH_DB_BUSY error.
 *
 * This function will destroy mutexes, deallocate
 * memory and stop the event processor.
 *
 * Note that this function is fully documented in the
 * main component header file, IxEthDB.h.
 *
 * @return IX_ETH_DB_SUCCESS if de-initialization
 * completed successfully or an appropriate error
 * message otherwise
 */
IX_ETH_DB_PUBLIC
IxEthDBStatus ixEthDBUnload(void)
{
    IxEthDBPortId portIndex;
    
    if (!ethDBInitializationComplete)
    {
        /* redundant */
        return IX_ETH_DB_SUCCESS;
    }

    /* check if any ports are enabled */
    for (portIndex = 0 ; portIndex < IX_ETH_DB_NUMBER_OF_PORTS ; portIndex++)
    {
        if (ixEthDBPortInfo[portIndex].enabled)
        {
            return IX_ETH_DB_BUSY;
        }

        ixEthDBPortInfo[portIndex].wifiRecordsCount = 0;
        ixEthDBPortInfo[portIndex].fwRecordsCount = 0;
        ixEthDBPortInfo[portIndex].featureCapability = 0;
	ixEthDBPortInfo[portIndex].featureStatus = 0; 
    }

    /* free port resources */
    for (portIndex = 0 ; portIndex < IX_ETH_DB_NUMBER_OF_PORTS ; portIndex++)
    {        
        if (ixEthDBPortDefinitions[portIndex].type == IX_ETH_NPE)
        {
            ixOsalMutexDestroy(&ixEthDBPortInfo[portIndex].npeAckLock);
        }

        ixEthDBPortInfo[portIndex].initialized = FALSE;
    }
    
    /* shutdown event processor */
    ixEthDBStopLearningFunction();
    
    /* deallocate NPE update zones */
    ixEthDBNPEUpdateAreasUnload();

    ethDBInitializationComplete = FALSE;

    return IX_ETH_DB_SUCCESS;
}

/**
 * @brief adds a new entry to the Ethernet database
 *
 * @param newRecordTemplate address of the record template to use
 * @param updateTrigger port map containing the update triggers
 * resulting from this update operation
 *
 * Creates a new database entry, populates it with the data
 * copied from the given template and adds the record to the
 * database hash table.
 * It also checks whether the new record type is registered to trigger
 * automatic updates; if it is, the update trigger will contain the
 * port on which the record insertion was performed, as well as the
 * old port in case the addition was a record migration (from one port
 * to the other). The caller can use the updateTrigger to trigger
 * automatic updates on the ports changed as a result of this addition.
 *
 * @retval IX_ETH_DB_SUCCESS addition successful
 * @retval IX_ETH_DB_NOMEM insertion failed, no memory left in the mac descriptor memory pool
 * @retval IX_ETH_DB_BUSY database busy, cannot insert due to locking
 *
 * @internal
 */
IX_ETH_DB_PUBLIC
IxEthDBStatus ixEthDBAdd(MacDescriptor *newRecordTemplate, IxEthDBPortMap updateTrigger)
{
    IxEthDBStatus result;
    MacDescriptor *newDescriptor;
    IxEthDBPortId originalPortID;
    HashNode *node = NULL;
    PortInfo *portInfo;
    
    BUSY_RETRY(ixEthDBSearchHashEntry(&dbHashtable, ixEthDBKeyType[newRecordTemplate->type], newRecordTemplate, &node));
    
    TEST_FIXTURE_INCREMENT_DB_CORE_ACCESS_COUNTER;

    if (node == NULL)
    {
        /* not found, create a new one */
        newDescriptor = ixEthDBAllocMacDescriptor();

        if (newDescriptor == NULL)
        {
            return IX_ETH_DB_NOMEM; /* no memory */
        }
        
        /* old port does not exist, avoid unnecessary updates */   
        originalPortID = newRecordTemplate->portID;

	portInfo = &ixEthDBPortInfo[originalPortID];