ixethdbevents.c

有关ARM开发板上的IXP400网络驱动程序的源码以。

    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, IX_IEEE803_MAC_ADDRESS_SIZE);
            
            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, IX_IEEE803_MAC_ADDRESS_SIZE);
            
            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, IX_IEEE803_MAC_ADDRESS_SIZE);
    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, IX_IEEE803_MAC_ADDRESS_SIZE);
        
        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);
}