author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:41:05 +0100 | |
branch | RCL_3 |
changeset 43 | d3d7683d16f5 |
parent 42 | a828660c511c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2002-2010 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the License "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: Declaration of the MgmtFrameMemMngr class. |
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* |
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*/ |
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/* |
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* %version: 15 % |
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*/ |
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#ifndef MGMTFRAMEMMNGR_H |
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#define MGMTFRAMEMMNGR_H |
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#include "EthernetFrameMemMngr.h" |
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class WlanChunk; |
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/** |
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* Memory manager for management client frame Rx memory |
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* |
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* @since S60 v3.1 |
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*/ |
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class MgmtFrameMemMngr : public DEthernetFrameMemMngr |
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{ |
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public: |
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/** Ctor */ |
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MgmtFrameMemMngr( |
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DWlanLogicalChannel& aParent, |
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WlanChunk*& aRxFrameMemoryPool, |
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TBool aUseCachedMemory, |
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TInt aRxFrameBufAllocationUnit ) : |
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DEthernetFrameMemMngr( aParent, aRxFrameMemoryPool ), |
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iUseCachedMemory( aUseCachedMemory ), |
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iRxFrameBufAllocationUnit ( aRxFrameBufAllocationUnit ), |
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iChunkSize( |
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Kern::RoundToPageSize( |
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4096 * 15 + KProtocolStackSideTxDataChunkSize ) ) // bytes |
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{}; |
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/** Dtor */ |
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virtual ~MgmtFrameMemMngr() {}; |
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protected: |
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/** |
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* From DEthernetFrameMemMngr |
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* Allocates a shared memory chunk for frame transfer between user |
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* and kernel address spaces |
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* |
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* @since S60 3.1 |
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* @param aSharedMemoryChunk The shared memory chunk |
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* @return system wide error code, KErrNone upon success |
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*/ |
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virtual TInt DoAllocate( DChunk*& aSharedMemoryChunk ); |
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/** |
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* Opens a handle for user mode client to the shared memory chunk |
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* allocated for frame transfer between user and kernel address spaces |
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* |
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* @since S60 3.1 |
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* @param aThread The user mode client thread |
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* @param aSharedChunkInfo After successful return contains the handle to the |
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* chunk |
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* @param aSharedMemoryChunk The shared memory chunk |
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* @return system wide error code, KErrNone upon success |
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*/ |
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virtual TInt DoOpenHandle( |
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DThread& aThread, |
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TSharedChunkInfo& aSharedChunkInfo, |
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DChunk* aSharedMemoryChunk ); |
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/** |
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* From DEthernetFrameMemMngr |
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* Gets a free rx buffer |
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* |
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* @since S60 3.1 |
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* @param aLengthinBytes Requested buffer length |
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* @return buffer for Rx data upon success |
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* NULL otherwise |
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*/ |
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virtual TUint8* DoGetNextFreeRxBuffer( TUint aLengthinBytes ); |
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/** |
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* From DEthernetFrameMemMngr |
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* Gets called when rx frame read cycle has ended. |
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* |
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* @since S60 3.1 |
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* @param aBufferStart first element of the array that holds pointers to |
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* Rx frame meta headers |
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* @param aNumOfBuffers number of meta header pointers in the array |
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* @return ETrue if a pending user mode frame read request exists |
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* and callee should complete it, |
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* EFalse otherwise |
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*/ |
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virtual TBool DoEthernetFrameRxComplete( |
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const TDataBuffer*& aBufferStart, |
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TUint32 aNumOfBuffers ); |
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/** |
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* From DEthernetFrameMemMngr |
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* Gets start address of Rx buffers (their offset addresses) |
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* that are waiting for completion to user mode |
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* |
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* @since S60 3.1 |
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* @return see above statement |
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*/ |
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virtual TUint32* DoGetTobeCompletedBuffersStart(); |
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/** |
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* From DEthernetFrameMemMngr |
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* Gets start address of Rx buffers (their offset addresses) |
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* that have been completed to user mode |
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* |
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* @since S60 3.1 |
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* @return see above statement |
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*/ |
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virtual TUint32* DoGetCompletedBuffersStart(); |
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/** |
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* From DEthernetFrameMemMngr |
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* Gets called when user mode client issues a frame receive request |
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* and Rx buffers have been completed to it. The completed Rx frame |
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* buffers are freed. |
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* |
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* @since S60 3.1 |
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*/ |
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virtual void DoFreeRxBuffers(); |
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/** |
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* From DEthernetFrameMemMngr |
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* Frees the specified Rx frame buffer |
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* |
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* @since S60 3.1 |
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* @param aBufferToFree The buffer to free |
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*/ |
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virtual void DoMarkRxBufFree( TUint8* aBufferToFree ); |
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private: |
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/** |
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* Returns the number of extra bytes required to align Rx buffer start |
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* address, to be returned to WHA layer, to allocation unit boundary |
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* @return See above |
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*/ |
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TInt RxBufAlignmentPadding() const; |
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/** |
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* From DEthernetFrameMemMngr |
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* Memory finalization method. |
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* Deallocates the shared memory chunk |
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* |
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* @since S60 3.1 |
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* @param aThread The user mode client thread |
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*/ |
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virtual void OnReleaseMemory( DThread& aThread ); |
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// Prohibit copy constructor. |
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MgmtFrameMemMngr( const MgmtFrameMemMngr& ); |
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// Prohibit assigment operator. |
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MgmtFrameMemMngr& operator= ( const MgmtFrameMemMngr & ); |
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private: // Data |
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/** |
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* kernel address of the shared memory chunk |
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*/ |
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TLinAddr iChunkKernelAddr; |
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/** |
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* array of TDataBuffer offset addresses, denoting Rx buffers, |
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* which are waiting here in kernel mode to be completed |
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* to user mode, when the next frame receive request arrives |
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*/ |
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TUint32 iTobeCompletedBuffers[KMaxToBeCompletedRxBufs]; |
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/** |
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* array of TDataBuffer offset addresses, denoting Rx buffers, that are |
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* currently under processing in user mode |
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*/ |
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TUint32 iCompletedBuffers[KMaxCompletedRxBufs]; |
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/** |
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* ETrue if cached frame transfer memory shall be used, |
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* EFalse otherwise |
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*/ |
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TBool iUseCachedMemory; |
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/** |
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* size of the Rx frame buffer allocation unit in bytes |
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*/ |
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TInt iRxFrameBufAllocationUnit; |
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/** size of the shared memory chunk */ |
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TInt iChunkSize; |
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}; |
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#endif // MGMTFRAMEMMNGR_H |