arch/arm/cpu/ixp/npe/IxEthDBEvents.c - u-boot - Git at Google

 /**
  * @file IxEthDBEvents.c
  *
  * @brief Implementation of the event processor component
  *
  * @par
  * IXP400 SW Release version 2.0
  *
  * -- Copyright Notice --
  *
  * @par
  * Copyright 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 <IxNpeMh.h>
 #include <IxFeatureCtrl.h>

 #include "IxEthDB_p.h"

 /* forward prototype declarations */
 IX_ETH_DB_PUBLIC void ixEthDBEventProcessorLoop(void *);
 IX_ETH_DB_PUBLIC void ixEthDBNPEEventCallback(IxNpeMhNpeId npeID, IxNpeMhMessage msg);
 IX_ETH_DB_PRIVATE void ixEthDBProcessEvent(PortEvent *local_event, IxEthDBPortMap triggerPorts);
 IX_ETH_DB_PRIVATE IxEthDBStatus ixEthDBTriggerPortUpdate(UINT32 eventType, IxEthDBMacAddr *macAddr, IxEthDBPortId portID, BOOL staticEntry);
 IX_ETH_DB_PUBLIC IxEthDBStatus ixEthDBStartLearningFunction(void);
 IX_ETH_DB_PUBLIC IxEthDBStatus ixEthDBStopLearningFunction(void);

 /* data */
 IX_ETH_DB_PRIVATE IxOsalSemaphore eventQueueSemaphore;
 IX_ETH_DB_PRIVATE PortEventQueue eventQueue;
 IX_ETH_DB_PRIVATE IxOsalMutex eventQueueLock;
 IX_ETH_DB_PRIVATE IxOsalMutex portUpdateLock;

 IX_ETH_DB_PRIVATE BOOL ixEthDBLearningShutdown      = FALSE;
 IX_ETH_DB_PRIVATE BOOL ixEthDBEventProcessorRunning = FALSE;

 /* imported data */
 extern HashTable dbHashtable;

 /**
  * @brief initializes the event processor
  *
  * Initializes the event processor queue and processing thread.
  * Called from ixEthDBInit() DB-subcomponent master init function.
  *
  * @warning do not call directly
  *
  * @retval IX_ETH_DB_SUCCESS initialization was successful
  * @retval IX_ETH_DB_FAIL initialization failed (OSAL or mutex init failure)
  *
  * @internal
  */
 IX_ETH_DB_PUBLIC
 IxEthDBStatus ixEthDBEventProcessorInit(void)
 {
     if (ixOsalMutexInit(&portUpdateLock) != IX_SUCCESS)
     {
         return IX_ETH_DB_FAIL;
     }

     if (ixOsalMutexInit(&eventQueueLock) != IX_SUCCESS)
     {
         return IX_ETH_DB_FAIL;
     }

     if (IX_FEATURE_CTRL_SWCONFIG_ENABLED ==
         ixFeatureCtrlSwConfigurationCheck (IX_FEATURECTRL_ETH_LEARNING))
     {

         /* start processor loop thread */
         if (ixEthDBStartLearningFunction() != IX_ETH_DB_SUCCESS)
         {
             return IX_ETH_DB_FAIL;
         }
     }

     return IX_ETH_DB_SUCCESS;
 }

 /**
  * @brief initializes the event queue and the event processor
  *
  * This function is called by the component initialization
  * function, ixEthDBInit().
  *
  * @warning do not call directly
  *
  * @return IX_ETH_DB_SUCCESS if the operation completed
  * successfully or IX_ETH_DB_FAIL otherwise
  *
  * @internal
  */
 IX_ETH_DB_PUBLIC
 IxEthDBStatus ixEthDBStartLearningFunction(void)
 {
     IxOsalThread eventProcessorThread;
     IxOsalThreadAttr threadAttr;

     threadAttr.name      = "EthDB event thread";
     threadAttr.stackSize = 32 * 1024; /* 32kbytes */
     threadAttr.priority  = 128;

     /* reset event queue */
     ixOsalMutexLock(&eventQueueLock, IX_OSAL_WAIT_FOREVER);

     RESET_QUEUE(&eventQueue);

     ixOsalMutexUnlock(&eventQueueLock);

     /* init event queue semaphore */
     if (ixOsalSemaphoreInit(&eventQueueSemaphore, 0) != IX_SUCCESS)
     {
         return IX_ETH_DB_FAIL;
     }

     ixEthDBLearningShutdown = FALSE;

     /* create processor loop thread */
     if (ixOsalThreadCreate(&eventProcessorThread, &threadAttr, ixEthDBEventProcessorLoop, NULL) != IX_SUCCESS)
     {
         return IX_ETH_DB_FAIL;
     }

     /* start event processor */
     ixOsalThreadStart(&eventProcessorThread);

     return IX_ETH_DB_SUCCESS;
 }

 /**
  * @brief stops the event processor
  *
  * Stops the event processor and frees the event queue semaphore
  * Called by the component de-initialization function, ixEthDBUnload()
  *
  * @warning do not call directly
  *
  * @return IX_ETH_DB_SUCCESS if the operation completed
  * successfully or IX_ETH_DB_FAIL otherwise;
  *
  * @internal
  */
 IX_ETH_DB_PUBLIC
 IxEthDBStatus ixEthDBStopLearningFunction(void)
 {
     ixEthDBLearningShutdown = TRUE;

     /* wake up event processing loop to actually process the shutdown event */
     ixOsalSemaphorePost(&eventQueueSemaphore);

     if (ixOsalSemaphoreDestroy(&eventQueueSemaphore) != IX_SUCCESS)
     {
         return IX_ETH_DB_FAIL;
     }

     return IX_ETH_DB_SUCCESS;
 }

 /**
  * @brief default NPE event processing callback
  *
  * @param npeID ID of the NPE that generated the event
  * @param msg NPE message (encapsulated event)
  *
  * Creates an event object on the Ethernet event processor queue
  * and signals the new event by incrementing the event queue semaphore.
  * Events are processed by @ref ixEthDBEventProcessorLoop() which runs
  * at user level.
  *
  * @see ixEthDBEventProcessorLoop()
  *
  * @warning do not call directly
  *
  * @internal
  */
 IX_ETH_DB_PUBLIC
 void ixEthDBNPEEventCallback(IxNpeMhNpeId npeID, IxNpeMhMessage msg)
 {
     PortEvent *local_event;

     IX_ETH_DB_IRQ_EVENTS_TRACE("DB: (Events) new event received by processor callback from port %d, id 0x%X\n", IX_ETH_DB_NPE_TO_PORT_ID(npeID), NPE_MSG_ID(msg), 0, 0, 0, 0);

     if (CAN_ENQUEUE(&eventQueue))
     {
         TEST_FIXTURE_LOCK_EVENT_QUEUE;

         local_event = QUEUE_HEAD(&eventQueue);

         /* create event structure on queue */
         local_event->eventType = NPE_MSG_ID(msg);
         local_event->portID    = IX_ETH_DB_NPE_TO_PORT_ID(npeID);

         /* update queue */
         PUSH_UPDATE_QUEUE(&eventQueue);

         TEST_FIXTURE_UNLOCK_EVENT_QUEUE;

         IX_ETH_DB_IRQ_EVENTS_TRACE("DB: (Events) Waking up main processor loop...\n", 0, 0, 0, 0, 0, 0);

         /* increment event queue semaphore */
         ixOsalSemaphorePost(&eventQueueSemaphore);
     }
     else
     {
         IX_ETH_DB_IRQ_EVENTS_TRACE("DB: (Events) Warning: could not enqueue event (overflow)\n", 0, 0, 0, 0, 0, 0);
     }
 }

 /**
  * @brief Ethernet event processor loop
  *
  * Extracts at most EVENT_PROCESSING_LIMIT batches of events and
  * sends them for processing to @ref ixEthDBProcessEvent().
  * Triggers port updates which normally follow learning events.
  *
  * @warning do not call directly, executes in separate thread
  *
  * @internal
  */
 IX_ETH_DB_PUBLIC
 void ixEthDBEventProcessorLoop(void *unused1)
 {
     IxEthDBPortMap triggerPorts;
     IxEthDBPortId portIndex;

     ixEthDBEventProcessorRunning = TRUE;

     IX_ETH_DB_EVENTS_TRACE("DB: (Events) Event processor loop was started\n");

     while (!ixEthDBLearningShutdown)
     {
         BOOL keepProcessing    = TRUE;
         UINT32 processedEvents = 0;

         IX_ETH_DB_EVENTS_VERBOSE_TRACE("DB: (Events) Waiting for new learning event...\n");

         ixOsalSemaphoreWait(&eventQueueSemaphore, IX_OSAL_WAIT_FOREVER);

         IX_ETH_DB_EVENTS_VERBOSE_TRACE("DB: (Events) Received new event\n");

         if (!ixEthDBLearningShutdown)
         {
             /* port update handling */
             SET_EMPTY_DEPENDENCY_MAP(triggerPorts);

             while (keepProcessing)
             {
                 PortEvent local_event;
                 UINT32 intLockKey;

                 /* lock queue */
                 ixOsalMutexLock(&eventQueueLock, IX_OSAL_WAIT_FOREVER);

                 /* lock NPE interrupts */
                 intLockKey = ixOsalIrqLock();

                 /* extract event */
                 local_event = *(QUEUE_TAIL(&eventQueue));

                 SHIFT_UPDATE_QUEUE(&eventQueue);

                 ixOsalIrqUnlock(intLockKey);

                 ixOsalMutexUnlock(&eventQueueLock);

                 IX_ETH_DB_EVENTS_TRACE("DB: (Events) Processing event with ID 0x%X\n", local_event.eventType);

                 ixEthDBProcessEvent(&local_event, triggerPorts);

                 processedEvents++;

                 if (processedEvents > EVENT_PROCESSING_LIMIT /* maximum burst reached? */
                     || ixOsalSemaphoreTryWait(&eventQueueSemaphore) != IX_SUCCESS) /* or empty queue? */
                 {
                     keepProcessing = FALSE;
                 }
             }

             ixEthDBUpdatePortLearningTrees(triggerPorts);
         }
     }

     /* turn off automatic updates */
     for (portIndex = 0 ; portIndex < IX_ETH_DB_NUMBER_OF_PORTS ; portIndex++)
     {
         ixEthDBPortInfo[portIndex].updateMethod.updateEnabled = FALSE;
     }

     ixEthDBEventProcessorRunning = FALSE;
 }

 /**
  * @brief event processor routine
  *
  * @param event event to be processed
  * @param triggerPorts port map accumulating ports to be updated
  *
  * Processes learning events by synchronizing the database with
  * newly learnt data. Called only by @ref ixEthDBEventProcessorLoop().
  *
  * @warning do not call directly
  *
  * @internal
  */
 IX_ETH_DB_PRIVATE
 void ixEthDBProcessEvent(PortEvent *local_event, IxEthDBPortMap triggerPorts)
 {
     MacDescriptor recordTemplate;

     switch (local_event->eventType)
     {
         case IX_ETH_DB_ADD_FILTERING_RECORD:
             /* add record */
             memset(&recordTemplate, 0, sizeof (recordTemplate));
             memcpy(recordTemplate.macAddress, local_event->macAddr.macAddress, sizeof (IxEthDBMacAddr));

             recordTemplate.type   = IX_ETH_DB_FILTERING_RECORD;
             recordTemplate.portID = local_event->portID;
             recordTemplate.recordData.filteringData.staticEntry = local_event->staticEntry;

             ixEthDBAdd(&recordTemplate, triggerPorts);

             IX_ETH_DB_EVENTS_TRACE("DB: (Events) Added record on port %d\n", local_event->portID);

             break;

         case IX_ETH_DB_REMOVE_FILTERING_RECORD:
             /* remove record */
             memset(&recordTemplate, 0, sizeof (recordTemplate));
             memcpy(recordTemplate.macAddress, local_event->macAddr.macAddress, sizeof (IxEthDBMacAddr));

             recordTemplate.type = IX_ETH_DB_FILTERING_RECORD | IX_ETH_DB_FILTERING_VLAN_RECORD;

             ixEthDBRemove(&recordTemplate, triggerPorts);

             IX_ETH_DB_EVENTS_TRACE("DB: (Events) Removed record on port %d\n", local_event->portID);

             break;

         default:
             /* can't handle/not interested in this event type */
             ERROR_LOG("DB: (Events) Event processor received an unknown event type (0x%X)\n", local_event->eventType);

             return;
     }
 }

 /**
  * @brief asynchronously adds a filtering record
  * by posting an ADD_FILTERING_RECORD event to the event queue
  *
  * @param macAddr MAC address of the new record
  * @param portID port ID of the new record
  * @param staticEntry TRUE if record is static, FALSE if dynamic
  *
  * @return IX_ETH_DB_SUCCESS if the event creation was
  * successfull or IX_ETH_DB_BUSY if the event queue is full
  *
  * @internal
  */
 IX_ETH_DB_PUBLIC
 IxEthDBStatus ixEthDBTriggerAddPortUpdate(IxEthDBMacAddr *macAddr, IxEthDBPortId portID, BOOL staticEntry)
 {
     MacDescriptor reference;

     TEST_FIXTURE_INCREMENT_DB_CORE_ACCESS_COUNTER;

     /* fill search fields */
     memcpy(reference.macAddress, macAddr, sizeof (IxEthDBMacAddr));
     reference.portID = portID;

     /* set acceptable record types */
     reference.type = IX_ETH_DB_ALL_FILTERING_RECORDS;

     if (ixEthDBPeekHashEntry(&dbHashtable, IX_ETH_DB_MAC_PORT_KEY, &reference) == IX_ETH_DB_SUCCESS)
     {
         /* already have an identical record */
         return IX_ETH_DB_SUCCESS;
     }
     else
     {
         return ixEthDBTriggerPortUpdate(IX_ETH_DB_ADD_FILTERING_RECORD, macAddr, portID, staticEntry);
     }
 }

 /**
  * @brief asynchronously removes a filtering record
  * by posting a REMOVE_FILTERING_RECORD event to the event queue
  *
  * @param macAddr MAC address of the record to remove
  * @param portID port ID of the record to remove
  *
  * @return IX_ETH_DB_SUCCESS if the event creation was
  * successfull or IX_ETH_DB_BUSY if the event queue is full
  *
  * @internal
  */
 IX_ETH_DB_PUBLIC
 IxEthDBStatus ixEthDBTriggerRemovePortUpdate(IxEthDBMacAddr *macAddr, IxEthDBPortId portID)
 {
     if (ixEthDBPeek(macAddr, IX_ETH_DB_ALL_FILTERING_RECORDS) != IX_ETH_DB_NO_SUCH_ADDR)
     {
         return ixEthDBTriggerPortUpdate(IX_ETH_DB_REMOVE_FILTERING_RECORD, macAddr, portID, FALSE);
     }
     else
     {
         return IX_ETH_DB_NO_SUCH_ADDR;
     }
 }

 /**
  * @brief adds an ADD or REMOVE event to the main event queue
  *
  * @param eventType event type - IX_ETH_DB_ADD_FILTERING_RECORD
  * to add and IX_ETH_DB_REMOVE_FILTERING_RECORD to remove a
  * record.
  *
  * @return IX_ETH_DB_SUCCESS if the event was successfully
  * sent or IX_ETH_DB_BUSY if the event queue is full
  *
  * @internal
  */
 IX_ETH_DB_PRIVATE
 IxEthDBStatus ixEthDBTriggerPortUpdate(UINT32 eventType, IxEthDBMacAddr *macAddr, IxEthDBPortId portID, BOOL staticEntry)
 {
     UINT32 intLockKey;

     /* lock interrupts to protect queue */
     intLockKey = ixOsalIrqLock();

     if (CAN_ENQUEUE(&eventQueue))
     {
         PortEvent *queueEvent = QUEUE_HEAD(&eventQueue);

         /* update fields on the queue */
         memcpy(queueEvent->macAddr.macAddress, macAddr->macAddress, sizeof (IxEthDBMacAddr));

         queueEvent->eventType     = eventType;
         queueEvent->portID        = portID;
         queueEvent->staticEntry   = staticEntry;

         PUSH_UPDATE_QUEUE(&eventQueue);

         /* imcrement event queue semaphore */
         ixOsalSemaphorePost(&eventQueueSemaphore);

         /* unlock interrupts */
         ixOsalIrqUnlock(intLockKey);

         return IX_ETH_DB_SUCCESS;
     }
     else /* event queue full */
     {
         /* unlock interrupts */
         ixOsalIrqUnlock(intLockKey);

         return IX_ETH_DB_BUSY;
     }
 }

 /**
  * @brief Locks learning tree updates and port disable
  *
  *
  * This function locks portUpdateLock single mutex. It is primarily used
  * to avoid executing 'port disable' during ELT maintenance.
  *
  * @internal
  */
 IX_ETH_DB_PUBLIC
 void ixEthDBUpdateLock(void)
 {
     ixOsalMutexLock(&portUpdateLock, IX_OSAL_WAIT_FOREVER);
 }

 /**
  * @brief Unlocks learning tree updates and port disable
  *
  *
  * This function unlocks a portUpdateLock mutex. It is primarily used
  * to avoid executing 'port disable' during ELT maintenance.
  *
  * @internal
  */
 IX_ETH_DB_PUBLIC
 void ixEthDBUpdateUnlock(void)
 {
     ixOsalMutexUnlock(&portUpdateLock);
 }
	/**
	* @file IxEthDBEvents.c
	*
	* @brief Implementation of the event processor component
	*
	* @par
	* IXP400 SW Release version 2.0
	*
	* -- Copyright Notice --
	*
	* @par
	* Copyright 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 <IxNpeMh.h>
	#include <IxFeatureCtrl.h>

	#include "IxEthDB_p.h"

	/* forward prototype declarations */
	IX_ETH_DB_PUBLIC void ixEthDBEventProcessorLoop(void *);
	IX_ETH_DB_PUBLIC void ixEthDBNPEEventCallback(IxNpeMhNpeId npeID, IxNpeMhMessage msg);
	IX_ETH_DB_PRIVATE void ixEthDBProcessEvent(PortEvent *local_event, IxEthDBPortMap triggerPorts);
	IX_ETH_DB_PRIVATE IxEthDBStatus ixEthDBTriggerPortUpdate(UINT32 eventType, IxEthDBMacAddr *macAddr, IxEthDBPortId portID, BOOL staticEntry);
	IX_ETH_DB_PUBLIC IxEthDBStatus ixEthDBStartLearningFunction(void);
	IX_ETH_DB_PUBLIC IxEthDBStatus ixEthDBStopLearningFunction(void);

	/* data */
	IX_ETH_DB_PRIVATE IxOsalSemaphore eventQueueSemaphore;
	IX_ETH_DB_PRIVATE PortEventQueue eventQueue;
	IX_ETH_DB_PRIVATE IxOsalMutex eventQueueLock;
	IX_ETH_DB_PRIVATE IxOsalMutex portUpdateLock;

	IX_ETH_DB_PRIVATE BOOL ixEthDBLearningShutdown = FALSE;
	IX_ETH_DB_PRIVATE BOOL ixEthDBEventProcessorRunning = FALSE;

	/* imported data */
	extern HashTable dbHashtable;

	/**
	* @brief initializes the event processor
	*
	* Initializes the event processor queue and processing thread.
	* Called from ixEthDBInit() DB-subcomponent master init function.
	*
	* @warning do not call directly
	*
	* @retval IX_ETH_DB_SUCCESS initialization was successful
	* @retval IX_ETH_DB_FAIL initialization failed (OSAL or mutex init failure)
	*
	* @internal
	*/
	IX_ETH_DB_PUBLIC
	IxEthDBStatus ixEthDBEventProcessorInit(void)
	{
	if (ixOsalMutexInit(&portUpdateLock) != IX_SUCCESS)
	{
	return IX_ETH_DB_FAIL;
	}

	if (ixOsalMutexInit(&eventQueueLock) != IX_SUCCESS)
	{
	return IX_ETH_DB_FAIL;
	}

	if (IX_FEATURE_CTRL_SWCONFIG_ENABLED ==
	ixFeatureCtrlSwConfigurationCheck (IX_FEATURECTRL_ETH_LEARNING))
	{

	/* start processor loop thread */
	if (ixEthDBStartLearningFunction() != IX_ETH_DB_SUCCESS)
	{
	return IX_ETH_DB_FAIL;
	}
	}

	return IX_ETH_DB_SUCCESS;
	}

	/**
	* @brief initializes the event queue and the event processor
	*
	* This function is called by the component initialization
	* function, ixEthDBInit().
	*
	* @warning do not call directly
	*
	* @return IX_ETH_DB_SUCCESS if the operation completed
	* successfully or IX_ETH_DB_FAIL otherwise
	*
	* @internal
	*/
	IX_ETH_DB_PUBLIC
	IxEthDBStatus ixEthDBStartLearningFunction(void)
	{
	IxOsalThread eventProcessorThread;
	IxOsalThreadAttr threadAttr;

	threadAttr.name = "EthDB event thread";
	threadAttr.stackSize = 32 * 1024; /* 32kbytes */
	threadAttr.priority = 128;

	/* reset event queue */
	ixOsalMutexLock(&eventQueueLock, IX_OSAL_WAIT_FOREVER);

	RESET_QUEUE(&eventQueue);

	ixOsalMutexUnlock(&eventQueueLock);

	/* init event queue semaphore */
	if (ixOsalSemaphoreInit(&eventQueueSemaphore, 0) != IX_SUCCESS)
	{
	return IX_ETH_DB_FAIL;
	}

	ixEthDBLearningShutdown = FALSE;

	/* create processor loop thread */
	if (ixOsalThreadCreate(&eventProcessorThread, &threadAttr, ixEthDBEventProcessorLoop, NULL) != IX_SUCCESS)
	{
	return IX_ETH_DB_FAIL;
	}

	/* start event processor */
	ixOsalThreadStart(&eventProcessorThread);

	return IX_ETH_DB_SUCCESS;
	}

	/**
	* @brief stops the event processor
	*
	* Stops the event processor and frees the event queue semaphore
	* Called by the component de-initialization function, ixEthDBUnload()
	*
	* @warning do not call directly
	*
	* @return IX_ETH_DB_SUCCESS if the operation completed
	* successfully or IX_ETH_DB_FAIL otherwise;
	*
	* @internal
	*/
	IX_ETH_DB_PUBLIC
	IxEthDBStatus ixEthDBStopLearningFunction(void)
	{
	ixEthDBLearningShutdown = TRUE;

	/* wake up event processing loop to actually process the shutdown event */
	ixOsalSemaphorePost(&eventQueueSemaphore);

	if (ixOsalSemaphoreDestroy(&eventQueueSemaphore) != IX_SUCCESS)
	{
	return IX_ETH_DB_FAIL;
	}

	return IX_ETH_DB_SUCCESS;
	}

	/**
	* @brief default NPE event processing callback
	*
	* @param npeID ID of the NPE that generated the event
	* @param msg NPE message (encapsulated event)
	*
	* Creates an event object on the Ethernet event processor queue
	* and signals the new event by incrementing the event queue semaphore.
	* Events are processed by @ref ixEthDBEventProcessorLoop() which runs
	* at user level.
	*
	* @see ixEthDBEventProcessorLoop()
	*
	* @warning do not call directly
	*
	* @internal
	*/
	IX_ETH_DB_PUBLIC
	void ixEthDBNPEEventCallback(IxNpeMhNpeId npeID, IxNpeMhMessage msg)
	{
	PortEvent *local_event;

	IX_ETH_DB_IRQ_EVENTS_TRACE("DB: (Events) new event received by processor callback from port %d, id 0x%X\n", IX_ETH_DB_NPE_TO_PORT_ID(npeID), NPE_MSG_ID(msg), 0, 0, 0, 0);

	if (CAN_ENQUEUE(&eventQueue))
	{
	TEST_FIXTURE_LOCK_EVENT_QUEUE;

	local_event = QUEUE_HEAD(&eventQueue);

	/* create event structure on queue */
	local_event->eventType = NPE_MSG_ID(msg);
	local_event->portID = IX_ETH_DB_NPE_TO_PORT_ID(npeID);

	/* update queue */
	PUSH_UPDATE_QUEUE(&eventQueue);

	TEST_FIXTURE_UNLOCK_EVENT_QUEUE;

	IX_ETH_DB_IRQ_EVENTS_TRACE("DB: (Events) Waking up main processor loop...\n", 0, 0, 0, 0, 0, 0);

	/* increment event queue semaphore */
	ixOsalSemaphorePost(&eventQueueSemaphore);
	}
	else
	{
	IX_ETH_DB_IRQ_EVENTS_TRACE("DB: (Events) Warning: could not enqueue event (overflow)\n", 0, 0, 0, 0, 0, 0);
	}
	}

	/**
	* @brief Ethernet event processor loop
	*
	* Extracts at most EVENT_PROCESSING_LIMIT batches of events and
	* sends them for processing to @ref ixEthDBProcessEvent().
	* Triggers port updates which normally follow learning events.
	*
	* @warning do not call directly, executes in separate thread
	*
	* @internal
	*/
	IX_ETH_DB_PUBLIC
	void ixEthDBEventProcessorLoop(void *unused1)
	{
	IxEthDBPortMap triggerPorts;
	IxEthDBPortId portIndex;

	ixEthDBEventProcessorRunning = TRUE;

	IX_ETH_DB_EVENTS_TRACE("DB: (Events) Event processor loop was started\n");

	while (!ixEthDBLearningShutdown)
	{
	BOOL keepProcessing = TRUE;
	UINT32 processedEvents = 0;

	IX_ETH_DB_EVENTS_VERBOSE_TRACE("DB: (Events) Waiting for new learning event...\n");

	ixOsalSemaphoreWait(&eventQueueSemaphore, IX_OSAL_WAIT_FOREVER);

	IX_ETH_DB_EVENTS_VERBOSE_TRACE("DB: (Events) Received new event\n");

	if (!ixEthDBLearningShutdown)
	{
	/* port update handling */
	SET_EMPTY_DEPENDENCY_MAP(triggerPorts);

	while (keepProcessing)
	{
	PortEvent local_event;
	UINT32 intLockKey;

	/* lock queue */
	ixOsalMutexLock(&eventQueueLock, IX_OSAL_WAIT_FOREVER);

	/* lock NPE interrupts */
	intLockKey = ixOsalIrqLock();

	/* extract event */
	local_event = *(QUEUE_TAIL(&eventQueue));

	SHIFT_UPDATE_QUEUE(&eventQueue);

	ixOsalIrqUnlock(intLockKey);

	ixOsalMutexUnlock(&eventQueueLock);

	IX_ETH_DB_EVENTS_TRACE("DB: (Events) Processing event with ID 0x%X\n", local_event.eventType);

	ixEthDBProcessEvent(&local_event, triggerPorts);

	processedEvents++;

	if (processedEvents > EVENT_PROCESSING_LIMIT /* maximum burst reached? */
	\|\| ixOsalSemaphoreTryWait(&eventQueueSemaphore) != IX_SUCCESS) /* or empty queue? */
	{
	keepProcessing = FALSE;
	}
	}

	ixEthDBUpdatePortLearningTrees(triggerPorts);
	}
	}

	/* turn off automatic updates */
	for (portIndex = 0 ; portIndex < IX_ETH_DB_NUMBER_OF_PORTS ; portIndex++)
	{
	ixEthDBPortInfo[portIndex].updateMethod.updateEnabled = FALSE;
	}

	ixEthDBEventProcessorRunning = FALSE;
	}

	/**
	* @brief event processor routine
	*
	* @param event event to be processed
	* @param triggerPorts port map accumulating ports to be updated
	*
	* Processes learning events by synchronizing the database with
	* newly learnt data. Called only by @ref ixEthDBEventProcessorLoop().
	*
	* @warning do not call directly
	*
	* @internal
	*/
	IX_ETH_DB_PRIVATE
	void ixEthDBProcessEvent(PortEvent *local_event, IxEthDBPortMap triggerPorts)
	{
	MacDescriptor recordTemplate;

	switch (local_event->eventType)
	{
	case IX_ETH_DB_ADD_FILTERING_RECORD:
	/* add record */
	memset(&recordTemplate, 0, sizeof (recordTemplate));
	memcpy(recordTemplate.macAddress, local_event->macAddr.macAddress, sizeof (IxEthDBMacAddr));

	recordTemplate.type = IX_ETH_DB_FILTERING_RECORD;
	recordTemplate.portID = local_event->portID;
	recordTemplate.recordData.filteringData.staticEntry = local_event->staticEntry;

	ixEthDBAdd(&recordTemplate, triggerPorts);

	IX_ETH_DB_EVENTS_TRACE("DB: (Events) Added record on port %d\n", local_event->portID);

	break;

	case IX_ETH_DB_REMOVE_FILTERING_RECORD:
	/* remove record */
	memset(&recordTemplate, 0, sizeof (recordTemplate));
	memcpy(recordTemplate.macAddress, local_event->macAddr.macAddress, sizeof (IxEthDBMacAddr));

	recordTemplate.type = IX_ETH_DB_FILTERING_RECORD \| IX_ETH_DB_FILTERING_VLAN_RECORD;

	ixEthDBRemove(&recordTemplate, triggerPorts);

	IX_ETH_DB_EVENTS_TRACE("DB: (Events) Removed record on port %d\n", local_event->portID);

	break;

	default:
	/* can't handle/not interested in this event type */
	ERROR_LOG("DB: (Events) Event processor received an unknown event type (0x%X)\n", local_event->eventType);

	return;
	}
	}

	/**
	* @brief asynchronously adds a filtering record
	* by posting an ADD_FILTERING_RECORD event to the event queue
	*
	* @param macAddr MAC address of the new record
	* @param portID port ID of the new record
	* @param staticEntry TRUE if record is static, FALSE if dynamic
	*
	* @return IX_ETH_DB_SUCCESS if the event creation was
	* successfull or IX_ETH_DB_BUSY if the event queue is full
	*
	* @internal
	*/
	IX_ETH_DB_PUBLIC
	IxEthDBStatus ixEthDBTriggerAddPortUpdate(IxEthDBMacAddr *macAddr, IxEthDBPortId portID, BOOL staticEntry)
	{
	MacDescriptor reference;

	TEST_FIXTURE_INCREMENT_DB_CORE_ACCESS_COUNTER;

	/* fill search fields */
	memcpy(reference.macAddress, macAddr, sizeof (IxEthDBMacAddr));
	reference.portID = portID;

	/* set acceptable record types */
	reference.type = IX_ETH_DB_ALL_FILTERING_RECORDS;

	if (ixEthDBPeekHashEntry(&dbHashtable, IX_ETH_DB_MAC_PORT_KEY, &reference) == IX_ETH_DB_SUCCESS)
	{
	/* already have an identical record */
	return IX_ETH_DB_SUCCESS;
	}
	else
	{
	return ixEthDBTriggerPortUpdate(IX_ETH_DB_ADD_FILTERING_RECORD, macAddr, portID, staticEntry);
	}
	}

	/**
	* @brief asynchronously removes a filtering record
	* by posting a REMOVE_FILTERING_RECORD event to the event queue
	*
	* @param macAddr MAC address of the record to remove
	* @param portID port ID of the record to remove
	*
	* @return IX_ETH_DB_SUCCESS if the event creation was
	* successfull or IX_ETH_DB_BUSY if the event queue is full
	*
	* @internal
	*/
	IX_ETH_DB_PUBLIC
	IxEthDBStatus ixEthDBTriggerRemovePortUpdate(IxEthDBMacAddr *macAddr, IxEthDBPortId portID)
	{
	if (ixEthDBPeek(macAddr, IX_ETH_DB_ALL_FILTERING_RECORDS) != IX_ETH_DB_NO_SUCH_ADDR)
	{
	return ixEthDBTriggerPortUpdate(IX_ETH_DB_REMOVE_FILTERING_RECORD, macAddr, portID, FALSE);
	}
	else
	{
	return IX_ETH_DB_NO_SUCH_ADDR;
	}
	}

	/**
	* @brief adds an ADD or REMOVE event to the main event queue
	*
	* @param eventType event type - IX_ETH_DB_ADD_FILTERING_RECORD
	* to add and IX_ETH_DB_REMOVE_FILTERING_RECORD to remove a
	* record.
	*
	* @return IX_ETH_DB_SUCCESS if the event was successfully
	* sent or IX_ETH_DB_BUSY if the event queue is full
	*
	* @internal
	*/
	IX_ETH_DB_PRIVATE
	IxEthDBStatus ixEthDBTriggerPortUpdate(UINT32 eventType, IxEthDBMacAddr *macAddr, IxEthDBPortId portID, BOOL staticEntry)
	{
	UINT32 intLockKey;

	/* lock interrupts to protect queue */
	intLockKey = ixOsalIrqLock();

	if (CAN_ENQUEUE(&eventQueue))
	{
	PortEvent *queueEvent = QUEUE_HEAD(&eventQueue);

	/* update fields on the queue */
	memcpy(queueEvent->macAddr.macAddress, macAddr->macAddress, sizeof (IxEthDBMacAddr));

	queueEvent->eventType = eventType;
	queueEvent->portID = portID;
	queueEvent->staticEntry = staticEntry;

	PUSH_UPDATE_QUEUE(&eventQueue);

	/* imcrement event queue semaphore */
	ixOsalSemaphorePost(&eventQueueSemaphore);

	/* unlock interrupts */
	ixOsalIrqUnlock(intLockKey);

	return IX_ETH_DB_SUCCESS;
	}
	else /* event queue full */
	{
	/* unlock interrupts */
	ixOsalIrqUnlock(intLockKey);

	return IX_ETH_DB_BUSY;
	}
	}

	/**
	* @brief Locks learning tree updates and port disable
	*
	*
	* This function locks portUpdateLock single mutex. It is primarily used
	* to avoid executing 'port disable' during ELT maintenance.
	*
	* @internal
	*/
	IX_ETH_DB_PUBLIC
	void ixEthDBUpdateLock(void)
	{
	ixOsalMutexLock(&portUpdateLock, IX_OSAL_WAIT_FOREVER);
	}

	/**
	* @brief Unlocks learning tree updates and port disable
	*
	*
	* This function unlocks a portUpdateLock mutex. It is primarily used
	* to avoid executing 'port disable' during ELT maintenance.
	*
	* @internal
	*/
	IX_ETH_DB_PUBLIC
	void ixEthDBUpdateUnlock(void)
	{
	ixOsalMutexUnlock(&portUpdateLock);
	}