usbmgmt/usbmgr/device/classdrivers/ncm/classimplementation/ncmpktdrv/pktdrv/src/ncmbuffermanager.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/usbmgmt/usbmgr/device/classdrivers/ncm/classimplementation/ncmpktdrv/pktdrv/src/ncmbuffermanager.cpp Tue Aug 31 17:01:47 2010 +0300
@@ -0,0 +1,170 @@
+/*
+* Copyright (c) 2010 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:
+*
+*/
+
+
+/**
+@file
+@internalComponent
+*/
+
+
+#include "ncmbuffermanager.h"
+#include "OstTraceDefinitions.h"
+#ifdef OST_TRACE_COMPILER_IN_USE
+#include "ncmbuffermanagerTraces.h"
+#endif
+
+
+
+
+// if there are KCongestionCount buffers will notify networking to stop sending
+// if there are at least KUnCongestionCount, will notify networking to start sending
+const TInt KCongestionCount = 1;
+const TInt KUnCongestionCount = 3;
+
+
+
+// ======== MEMBER FUNCTIONS ========
+//
+
+CNcmBufferManager* CNcmBufferManager::NewL()
+ {
+ OstTraceFunctionEntry0( CNCMBUFFERMANAGER_NEWL_ENTRY );
+ CNcmBufferManager *self = new (ELeave) CNcmBufferManager();
+ OstTraceFunctionExit0( CNCMBUFFERMANAGER_NEWL_EXIT );
+ return self;
+ }
+
+CNcmBufferManager::~CNcmBufferManager()
+ {
+ OstTraceFunctionEntry1( CNCMBUFFERMANAGER_CNCMBUFFERMANAGER_ENTRY, this );
+ iFreeQueue.Reset();
+ OstTraceFunctionExit1( CNCMBUFFERMANAGER_CNCMBUFFERMANAGER_EXIT, this );
+ }
+
+//
+// get a buffer block from manager
+//
+TInt CNcmBufferManager::GetBuffer(TNcmBuffer& aBuffer)
+ {
+ OstTraceFunctionEntry1( CNCMBUFFERMANAGER_GETBUFFER_ENTRY, this );
+
+ TInt count = iFreeQueue.Count();
+ TInt ret = KErrNone;
+
+ if (count == 0)
+ {
+ OstTraceFunctionExit1( CNCMBUFFERMANAGER_GETBUFFER_EXIT, this );
+ return KErrNoBuffer;
+ }
+ else if (count == KCongestionCount)
+ {
+ iIsCongestion = ETrue;
+ ret = KErrCongestion;
+ }
+ aBuffer = iFreeQueue[0];
+ iFreeQueue.Remove(0);
+ OstTraceFunctionExit1( CNCMBUFFERMANAGER_GETBUFFER_EXIT_DUP1, this );
+ return ret;
+ }
+
+//
+// free a buffer block to manager
+//
+void CNcmBufferManager::FreeBuffer(const TNcmBuffer& aBuffer)
+ {
+ OstTraceFunctionEntry1( CNCMBUFFERMANAGER_FREEBUFFER_ENTRY, this );
+ iFreeQueue.Append(aBuffer);
+ int count = iFreeQueue.Count();
+ iFreeQueue[count-1].iLen = 0;
+ if (count == KUnCongestionCount)
+ {
+ iIsCongestion = EFalse;
+ }
+ OstTraceFunctionExit1( CNCMBUFFERMANAGER_FREEBUFFER_EXIT, this );
+ }
+
+//
+// set the whole buffer area to create buffer blocks
+//
+void CNcmBufferManager::InitBufferArea(TAny* aBuf, TInt aLength)
+ {
+ OstTrace1( TRACE_NORMAL, CNCMBUFFERMANAGER_INITBUFFERAREA, "CNcmBufferManager::InitBufferArea aLength=%d", aLength );
+ iBuf = (TUint8*)aBuf;
+ iLen = aLength;
+ }
+
+//
+// set the size of a buffer block, create buffer blocks on the buffer area
+//
+TInt CNcmBufferManager::SetBufferCellSize(TInt aSize)
+ {
+ OstTraceFunctionEntry1( CNCMBUFFERMANAGER_SETBUFFERCELLSIZE_ENTRY, this );
+
+// buffer block size must be aligned with KAlignSize to make the each buffer start align with KAlignSize
+ iCellSize = (aSize+iAlignSize-1)&~(iAlignSize-1);
+ OstTraceExt2( TRACE_NORMAL, CNCMBUFFERMANAGER_SETBUFFERCELLSIZE, "CNcmBufferManager::SetBufferCellSize aSize=%d, iCellSize=%d", aSize, iCellSize );
+
+// buffer area got from share chunk LDD may not align, make it align to KAlignSize first
+ TUint32 buf = (TUint)iBuf;
+ buf = (buf+iAlignSize-1)&~(iAlignSize-1);
+ TUint8* alignbuf = (TUint8*)buf;
+ TUint32 offset = buf - (TUint)iBuf;
+
+ int count = (iLen-offset)/iCellSize;
+ iFreeQueue.Reset();
+ if (count < KUnCongestionCount)
+ {
+ OstTrace1( TRACE_FATAL, CNCMBUFFERMANAGER_SETBUFFERCELLSIZE1, "the buffer cell size is too big and create too less buffers %d", count );
+ OstTraceFunctionExit1( CNCMBUFFERMANAGER_SETBUFFERCELLSIZE_EXIT, this );
+ return KErrUnknown;
+ }
+
+ TNcmBuffer ncmbuf;
+ for (TInt i=0 ; i<count ; i++)
+ {
+ ncmbuf.iPtr = alignbuf+i*iCellSize;
+ ncmbuf.iLen = 0;
+ ncmbuf.iMaxLength = iCellSize;
+ iFreeQueue.Append(ncmbuf);
+ }
+ iIsCongestion = EFalse;
+ OstTraceFunctionExit1( CNCMBUFFERMANAGER_SETBUFFERCELLSIZE_EXIT_DUP1, this );
+ return KErrNone;
+ }
+
+CNcmBufferManager::CNcmBufferManager()
+ {
+ iIsCongestion = EFalse;
+ }
+
+//
+// if there is not enough buffer blocks, return ETrue and will start flow control in networking
+//
+
+TBool CNcmBufferManager::IsCongestion()
+ {
+ OstTrace1( TRACE_NORMAL, CNCMBUFFERMANAGER_ISCONGESTION, "CNcmBufferManager::FreeBufferCount %d", iFreeQueue.Count() );
+ return iIsCongestion;
+ }
+
+TInt CNcmBufferManager::RequiredBufferCount()
+ {
+ return KUnCongestionCount;
+ }
+
+