--- a/telephonyprotocols/rawipnif/version1/src/BcaController.cpp Wed Aug 18 10:57:47 2010 +0300
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,437 +0,0 @@
-// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).
-// All rights reserved.
-// This component and the accompanying materials are made available
-// under the terms of "Eclipse Public License v1.0"
-// which accompanies this distribution, and is available
-// at the URL "http://www.eclipse.org/legal/epl-v10.html".
-//
-// Initial Contributors:
-// Nokia Corporation - initial contribution.
-//
-// Contributors:
-//
-// Description:
-// Implements the interface to Bca & flow control.
-//
-//
-
-/**
- @file
-*/
-
-#include <e32uid.h>
-#include <nifmbuf.h>
-#include <es_ini.h>
-#include "BcaController.h"
-
-_LIT(KRawIpIniFile, "rawip.ini");
-_LIT(KLinkLit, "link");
-_LIT(KHighmarkLit, "highmark");
-//In order not to flow off SPUD everytime we set the default to 1
-const TUint KDefaultBufferSize=1;
-
-CBcaController::CBcaController(MControllerObserver& aObserver,
- CBttLogger* aTheLogger)
-/**
- * Constructor.
- */
- : iObserver(aObserver),
- iTheLogger(aTheLogger),
- iTxFlowControl(EFlowControlOff),
- iTxContextActive(ETrue),
- iSendState(EIdle),
- iMaxSendQueueLen(0),
- iNumPacketsInSendQueue(0)
- {
- iSendQueue.Init();
- }
-
-
-CBcaController::~CBcaController()
-/**
- * Destructor.
- */
- {
- iSendQueue.Free();
- iNumPacketsInSendQueue = 0;
-
-#ifdef RAWIP_HEADER_APPENDED_TO_PACKETS
- delete iIPTagHeader;
-#endif // RAWIP_HEADER_APPENDED_TO_PACKETS
- }
-
-void CBcaController::BaseConstructL()
- {
- _LOG_L1C1(_L8("CBcaController::BaseConstructL"));
-
-#ifdef RAWIP_HEADER_APPENDED_TO_PACKETS
- iIPTagHeader = new (ELeave) CIPTagHeader(iTheLogger);
-#endif // RAWIP_HEADER_APPENDED_TO_PACKETS
- CESockIniData* iniData = NULL;
- TRAPD(res, iniData = CESockIniData::NewL(KRawIpIniFile));
- CleanupStack::PushL(iniData);
-
- if(res!=KErrNone)
- {
- _LOG_L1C2(_L8("RawIp ini file %S not found. Default values will be used."), &KRawIpIniFile);
- CleanupStack::PopAndDestroy();
- return;
- }
-
- //here process the file
- if(!iniData->FindVar(KLinkLit(), KHighmarkLit(), iMaxSendQueueLen))
- {
- iMaxSendQueueLen = KDefaultBufferSize;
- }
-
- CleanupStack::PopAndDestroy();
- }
-
-void CBcaController::UpdateInternalFlowFlag(TFlowControl aValue)
-/**
- * Updates Internal Flow flag and resumes the data flow if
- * necessary.
- *
- * @param aValue the new state of iInternalFlow
- */
- {
- _LOG_L1C3(_L8("CBcaController::UpdateInternalFlowFlag[NewValue=%d, iSendState=%d]"),
- aValue, iSendState);
-
- if(iTxFlowControl == aValue)
- {
- // C32 Sent the same indication signal twice. Nif will ignore it.
- _LOG_L2C1(_L8("WARNING CBcaController: Received same indication twice"));
- return;
- }
-
- // Update the flag value.
- iTxFlowControl = aValue;
-
- if(iTxFlowControl == EFlowControlOff)
- {
- // If the indication received turned flow control off...
- if (IsTxPossible() && (iSendState == EIdle))
- {
- // ... if the NIF is in the EWaiting state
- // then the data flow can be resumed.
- ResumeSending();
- }
- }
- else
- {
- // if the Flow Control is on we can remove all queued write requests
- EmptySendQueue();
- }
- }
-
-void CBcaController::UpdateContextStateFlag(TBool aValue)
-/**
- * Updates Context State flag and resumes the data flow if
- * necessary.
- *
- * @param aValue the new state of iTxContextState
- */
- {
- _LOG_L1C3(_L8("CBcaController::UpdateContextStateFlag[NewValue=%d, OldValue=%d]"),
- aValue, iTxContextActive);
-
- if(iTxContextActive == aValue)
- {
- return;
- }
-
- // Update the flag value.
- iTxContextActive = aValue;
-
- if(iTxContextActive)
- {
- // If the PDP context is active and...
- if (IsTxPossible() && (iSendState == EIdle))
- {
- // ... if the NIF is in the EWaiting state
- // then the data flow can be resumed.
- ResumeSending();
- }
- }
- else
- {
- // if the PDP context is suspended we can remove all queued write requests
- EmptySendQueue();
- }
- }
-
-TInt CBcaController::Send(RMBufChain& aPdu)
-/**
- * This method is called by CRawIPNifMain in order to send a packet down
- * to the BCA.
- *
- * @param aPdu a data packet
- */
- {
- _LOG_L1C1(_L8(">>CBcaController::Send"));
-
- // Check if NIF is shutting down
- if (iSendState == EShuttingDown)
- {
- _LOG_L2C1(_L8(" ERROR: Nif is shutting down"));
-
- aPdu.Free();
-
- return KErrDisconnected;
- }
-
- // check that this packet isnt too big - If it is, we dont want to send it or
- // add it to our queue
- if ((aPdu.Length() - aPdu.First()->Length()) > BcaSendBufferLength())
- {
- _LOG_L2C1(_L8("Packet is too large - discarding"));
- _LOG_L1C1(_L8("<<CSender::Send -> Error"));
-
- aPdu.Free();
- return KErrArgument;
- }
-
- if (iSendState == ESending)
- // If this happens, it means that TCP/IP has sent us an IP packet
- // while we're still sending the previous one.
- {
- // check that the queue isnt full NB. this check should not be needed as when the
- // queue becomes full the IP layer shouldnt send any more packets until it is told to
- if (!IsSendQueueFull())
- {
- _LOG_L1C1(_L8(" Sender busy, appending packet to queue"));
- //We know that flow control is off and context isnt suspended so can add to queue
- AppendToSendQueue(aPdu);
-
- return IsSendQueueFull() ? KStopSending : KContinueSending;
- }
-
- _LOG_L1C1(_L8(" Queue is full, upper layer is still sending packets, potential memory problems."));
- AppendToSendQueue(aPdu);
- return KStopSending;
- }
-
- // If we have got here then a write isnt currently happening
- // We dont need to check flow control is off and context isnt suspended as the BCA always
- // has room for one packet, so send the packet
-
- if(!IsSendQueueEmpty())
- {
- //make sure that we don't change the order of packets!
- //first send what has already been lined up
- RMBufChain tmpPdu;
- _LOG_L1C1(_L8(" Packet removed from queue to send"));
- RemoveFromSendQueue(tmpPdu);
- AppendToSendQueue(aPdu);
-
- // Update module state
- _LOG_L2C1(_L8(" set State to ESending"));
- iSendState = ESending;
-
- BcaSend(tmpPdu);
- }
- else
- {
- // Update module state
- _LOG_L2C1(_L8(" set State to ESending"));
- iSendState = ESending;
-
- BcaSend(aPdu);
- }
-
- _LOG_L2C1(_L8("<<CBcaController::Send - return StopSending/ContinueSending"));
- return IsSendQueueFull() ? KStopSending : KContinueSending;
- }
-
-void CBcaController::SendComplete()
-/**
- * This method is called after a packet was sent to the board.
- * If allowed by flow contol flags the NIF can signal the TCP/IP
- * protocol indicating that is available to send more packets.
- */
- {
- _LOG_L1C1(_L8("CBcaController::SendComplete"));
- _LOG_L2C1(_L8(" set State to EIdle"));
-
- iSendState = EIdle;
-
- if (IsTxPossible())
- ResumeSending();
- }
-
-TBool CBcaController::IsTxPossible()
-/**
- * This method returns ETrue if both TX flags are set to ETrue
- *
- * @return The Flow control state
- */
- {
- _LOG_L1C3(_L8("CBcaController::IsTxPossible (contextActive %d, flowcontrol %d)"),
- iTxContextActive, iTxFlowControl);
-
- if(iTxContextActive && (iTxFlowControl == EFlowControlOff))
- return ETrue;
- else
- return EFalse;
- }
-
-void CBcaController::Process(TDesC8& aPdu)
-/**
- * This method will pass on the received data to CBttNifMain.
- *
- * @param aPdu a data packet
- */
- {
- _LOG_L1C1(_L8(">>CBcaController::Process"));
-
- TInt ret;
-
- // Create a packet object.
- RMBufPacket packet;
- TRAP(ret, packet.CreateL(aPdu));
- if (ret != KErrNone)
- {
- // Couldn't create package. Packet will be ignored...
- _LOG_L1C2(_L8("<<CBcaController::Process couldn't create MBuf [ret=%d]"), ret);
- return;
- }
- else
- // Package created...
- {
-#ifdef RAWIP_HEADER_APPENDED_TO_PACKETS
- TUint16 protocolCode = iIPTagHeader->RemoveHeader(packet);
-#else
- TUint16 protocolCode = 0;
-#endif // RAWIP_HEADER_APPENDED_TO_PACKETS
-
- packet.Pack();
- // Process the packet
- GetObserver().Process(packet, protocolCode);
- }
-
- _LOG_L1C1(_L8("<<CBcaController::Process"));
- }
-
-void CBcaController::ResumeSending()
-/**
- * Used to indicate to the TCP/IP protocol layer that the NIF is ready to
- * process more packets.
- */
- {
- _LOG_L1C1(_L8("CBcaIoController::ResumeSending"));
-
- // If there are still some packets in the queue to be sent, then carry
- // on sending them.
- // NB. we only want to send more packets from the queue if we are currently EIdle
- if (iSendState == EIdle)
- {
- if(!IsSendQueueEmpty())
- {
- RMBufChain tmpPdu;
- _LOG_L1C1(_L8(" Packet removed from queue to send"));
- RemoveFromSendQueue(tmpPdu);
-
- // Update module state
- _LOG_L2C1(_L8(" set State to ESending"));
- iSendState = ESending;
-
- BcaSend(tmpPdu);
- }
- if(IsSendQueueEmpty())
- {
- iObserver.ResumeSending();
- }
- }
- // if iSendState = ESending - do nothing
- }
-
-#ifdef RAWIP_HEADER_APPENDED_TO_PACKETS
-void CBcaController::SetType(TUint16 aType)
-{
-/**
- * Used to specify the type of the IP header.
- */
- _LOG_L1C1(_L8("CBcaController::SetType"));
-
- iIPTagHeader->SetType(aType);
-}
-
-void CBcaController::AddHeader(TDes8& aDes)
-/**
- * Used to add the IP header to the packet before sending to the BCA.
- */
- {
- _LOG_L1C1(_L8("CBcaController::AddHeader"));
-
- iIPTagHeader->AddHeader(aDes);
- }
-
-TUint16 CBcaController::RemoveHeader(RMBufChain& aPdu)
-/**
- * Used to remove the IP header from the received the packet before sending to the
- * TCP/IP layer.
- * @return The IP header that has been removed from the packet
- */
- {
- _LOG_L1C1(_L8("CBcaController::RemoveHeader"));
-
- return (iIPTagHeader->RemoveHeader(aPdu));
- }
-#endif // RAWIP_HEADER_APPENDED_TO_PACKETS
-
-TBool CBcaController::IsSendQueueEmpty()
-/**
- * Indicator of whether the BufferQueue is empty
- * @return TBool. ETrue if bufferQueue is emtpy, EFalse if queue is not empty
- */
- {
- return iSendQueue.IsEmpty();
- }
-
-TBool CBcaController::IsSendQueueFull()
-/**
- * Indicator of whether the BufferQueue is full
- * @return TBool. ETrue if bufferQueue is full, EFalse if queue is not full
- */
- {
- return iNumPacketsInSendQueue >= iMaxSendQueueLen;
- }
-
-void CBcaController::AppendToSendQueue(RMBufChain& aPdu)
-/**
- * Appends the packet aPdu to the queue.
- * Increments the packet count. Doesn't do error checking.
- * @param aChain buffer chain to be added
- */
- {
- iSendQueue.Append(aPdu);
- iNumPacketsInSendQueue++;
- }
-
-TBool CBcaController::RemoveFromSendQueue(RMBufChain& aPdu)
-/**
- * Removes the packet aPdu from the queue.
- * Decrements the packet count.
- * @param aChain buffer chain to be added
- * @return False if chain is empty
- */
- {
- TBool ret = iSendQueue.Remove(aPdu);
- if(ret)
- {
- iNumPacketsInSendQueue--;
- }
- return ret;
- }
-
-void CBcaController::EmptySendQueue()
-/**
- * Removes all the packets from the send queue. Initializes the
- * send queue and sets the packet count to 0.
- */
- {
- iSendQueue.Free();
- iSendQueue.Init();
- iNumPacketsInSendQueue = 0;
- }