bluetooth/btstack/linkmgr/AclDataQ.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 15 Jan 2010 08:13:17 +0200
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// Copyright (c) 2001-2009 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 "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:
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//
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#ifndef _ACLDATAQ_H
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#define _ACLDATAQ_H
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#include <e32base.h>
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#include <bttypes.h>
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class CACLDataItem;
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class CHCIFacade;
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class CLinkMgrProtocol;
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/**
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	HCI ACL Data Packet Buffer Q.
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	This class will handle the Qing and issuing of ACL Data Packet Buffers.
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	It pre-allocates Packet buffers on the heap on construction, hence the 
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	number or size of preallocated buffers should not change after 
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	construction because ESock doesn't like memory Leaves.
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	For a UART HCTL implementation of the HCI, we need to be able to buffer 
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	HCI Data buffers of at least 255+1+4 bytes, since the HC must guarantee to 
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	be able to accept/buffer data packets of 255 bytes (EXCLUDING the headers).
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	The general usage includes:
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	1/ Obtaining items in the 'spare data pool'- for the client to populate 
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	with data (RemoveFirstSpareItem),
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	2/ Putting such items back on the 'data fifo' queue, for sending 
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	(AddItem), and
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	3/ When we do a send, getting an item to send (FirstItemByConnectionHandle 
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	and FirstItem) and moving it back to the spare data pool (InvalidateItem).
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	This class is not intended for derivation, to reuse aggregate.
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*/
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NONSHARABLE_CLASS(CAclDataQ) : public CBase
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	{
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public:
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	static CAclDataQ* NewL(CLinkMgrProtocol& aProtocol, 
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		TUint aNumberOfItems, 
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		TUint16 aDataSize, 
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		TUint16 aFramingOverhead);
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	~CAclDataQ();
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public:
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	inline TUint	Ceiling() const;
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	inline TUint	FillLevel() const;
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	void			AddItem(CACLDataItem& aACLItem);
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	inline TUint16	ItemSize() const;
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	void			InvalidateAll();
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	void			InvalidateByConnH(THCIConnHandle aConn, const CHCIFacade& aHCIFacade);
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	CACLDataItem*	RemoveFirstSpareItem();
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	CACLDataItem*	FirstItemByConnectionHandle(const CHCIFacade& aHCIFacade, const THCIConnHandle aConnH);
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	CACLDataItem*	FirstItem(const CHCIFacade& aHCIFacade, THCIConnHandle& aConnH);
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	void			PendingItem(CACLDataItem& aItem);
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	void 			ItemsSent(TUint aNumberOfItemsSent);
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	void 			ProcessFlush(const CHCIFacade& aHCIFacade, THCIConnHandle aConnH);
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private:
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	CAclDataQ();
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	void ConstructL(CLinkMgrProtocol& aProtocol, 
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		TUint aNumberOfItems, 
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		TUint16 aDataSize, 
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		TUint16 aFramingOverhead);
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private: // owned
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	// size of each item (HCI ACL Data buffer) in the FIFO
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	TUint16 iItemSize;
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	// max number of allocated items allowed
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	TUint iCeiling;
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	// how many packets are pending on the Q (iDataFifo)
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	TUint iLevel;
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	TSglQue<CACLDataItem>	iPreHardwareBuffer;	// A buffer for data prior to it being 
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	                                            // sent to the hardware buffer.
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	TSglQue<CACLDataItem>	iSpareDataPool;		// the 'empty' slots
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	TSglQue<CACLDataItem>	iPendingData;		// Data on the hardware.
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	};
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inline TUint CAclDataQ::Ceiling() const
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/**
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	Returns the maximum number of packets this Q will hold.
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*/
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	{
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	return iCeiling;
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	}
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inline TUint CAclDataQ::FillLevel() const
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/**
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	Returns the number of packets currently on the Q.
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*/
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	{
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	return iLevel;
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	}
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inline TUint16 CAclDataQ::ItemSize() const
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/**
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	Returns the data size of the packets that can be handled by this Q.
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*/
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	{
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	return iItemSize;
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	}
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#endif // _ACLDATAQ_H