bluetooth/btstack/linkmgr/hostmbufpool.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 11 May 2010 17:15:36 +0300
branchRCL_3
changeset 22 9f17f914e828
child 47 a1b8f5cc021e
permissions -rw-r--r--
Revision: 201017 Kit: 201019
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// Copyright (c) 1999-2010 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 "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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#include "hostmbufpool.h"
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#include <bluetooth/hcicommandqueue.h>
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#include <bluetooth/hci/hostnumberofcompletedpacketscommand.h>
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#include <bluetooth/hci/hcievents.h>
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#include <bluetooth/hci/commandcompleteevent.h>
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#include <bluetooth/hci/hciutil.h>
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#include "linkconsts.h"
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#include "linkutil.h"
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#include <bluetooth/logger.h>
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#ifdef HOSTCONTROLLER_TO_HOST_FLOW_CONTROL
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#ifdef __FLOG_ACTIVE
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_LIT8(KLogComponent, LOG_COMPONENT_LINKMGR);
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#endif
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__DEBUG_ONLY(PANICCATEGORY("mbufpool");)
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CHostMBufPool* CHostMBufPool::NewL(MHCICommandQueue& aCommandQueue)
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	{
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	LOG_STATIC_FUNC
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	CHostMBufPool* self = new (ELeave) CHostMBufPool(aCommandQueue);
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	CleanupStack::PushL(self);
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	self->ConstructL();
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	CleanupStack::Pop(self);
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	return self;
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	}
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void CHostMBufPool::DeletePool(TSglQue<TPoolBuffer>& aQueue)
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	{
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	LOG_FUNC
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	TPoolBuffer* buffer = NULL;
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	TSglQueIter<TPoolBuffer> iter(aQueue);
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	while(buffer=iter++, buffer)
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		{
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		aQueue.Remove(*buffer);
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		DeleteBuffer(buffer);
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		}
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	}
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void CHostMBufPool::DeleteBuffer(TPoolBuffer*& aBuffer)
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	{
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	LOG_FUNC
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	if(aBuffer)
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		{
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		aBuffer->iMBufChain.Free();
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		delete aBuffer;
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		aBuffer = NULL;
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		}
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	}
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CHostMBufPool::~CHostMBufPool()
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	{
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	LOG_FUNC
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	Cancel();
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	// iMBufRequester is cleaned in it's destructor (not much of an R-class...but it is what it is)
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	DeletePool(iBufferPool);
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	DeletePool(iWaitingAllocPool);
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	DeleteBuffer(iBufferBeingAllocd);
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	}
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CHostMBufPool::CHostMBufPool(MHCICommandQueue& aCommandQueue)
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	: CActive(EPriorityHigh) 
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	// High priority so that buffers are allocated occur before more data is read, this prevents
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	// the cases the data floods the device and exhausts the buffers before any more can be allocated.
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	// This maximises throughput since we will ensure we send packet completion notifications in a
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	// timely manner.
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	, iCmdQ(aCommandQueue)
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	, iBufferPool(_FOFF(TPoolBuffer,iLink))
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	, iWaitingAllocPool(_FOFF(TPoolBuffer,iLink))
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	, iCurrAckHandle(KErrNotFound)
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	{
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	LOG_FUNC
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	}
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void CHostMBufPool::ConstructL()
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/**
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2nd phase constructor for the Host MBuf Pool.
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This method will attempt to reserve enough MBufs from the global pool
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for bluetooth use.
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@leave KErrNoMemory If the required number of MBufs couldn't be reserved
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*/
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	{
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	LOG_FUNC
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	LOG2(_L("CHostMBufPool: now reserving %d size %d MBufChains"), KStackACLBuffersNum, KLinkMgrIncomingBufferSize);
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	for (TInt i=0; i<=KStackACLBuffersNum-1; i++)
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		{
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		TPoolBuffer* thisBuffer = CreatePoolBufferL();
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		AddToBufferPool(*thisBuffer);
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		}
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   112
		
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	CActiveScheduler::Add(this);
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	}
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   115
	
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CHostMBufPool::TPoolBuffer* CHostMBufPool::CreatePoolBufferL()
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	{
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	LOG_FUNC
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	TPoolBuffer* newBuffer = new(ELeave) TPoolBuffer();
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	CleanupStack::PushL(newBuffer);
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	newBuffer->iCurrentHandle = KInvalidConnectionHandle; // we assert on this later
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	newBuffer->iMBufChain.AllocL(KLinkMgrIncomingBufferSize);
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	CleanupStack::Pop(newBuffer);
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	return newBuffer;
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	}
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void CHostMBufPool::DoCancel()
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	{
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	LOG_FUNC
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	iMBufRequester.Cancel();
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	}
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RMBufChain CHostMBufPool::TakeBufferL(THCIConnHandle aConnHandle)
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/**
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Takes a buffer from the pool and schedules an asynchronous allocation
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of the next buffer.	 Only when that allocation has succeeded will the host
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controller be signalled with a host_number_of_completed_packets.  Hence,
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if we cannot allocate a buffer from the global MBuf pool, the host controller
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will be flowed off and no data will be lost.
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*/
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	{
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	LOG_FUNC
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	ASSERT_DEBUG(aConnHandle != KInvalidConnectionHandle);
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	// Speculatively attempt to allocate any queued allocations that may have previously failed.
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	TryToAllocQueuedBuffer();
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	TPoolBuffer* ready = iBufferPool.First();
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	if(!ready)
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		{
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		// Whoops run out of buffers - even though we were trying to prevent this with
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		// flow control, in the case of disconnection the controller will assume all the
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		// data for a connection handle will be flushed and therefore the buffers associated
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		// with that connection handle will be free.  Unfortunately for us we don't have
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		// that much control with the MBuf pool (since flow control is for asynchronous
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		// buffer allocation rather than waiting for the given MBufs to be relinquished
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		// by a higher layer).
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		// So the controller could think we have more buffers than we actually have...
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		LOG(_L8("CHostMBufPool: Ran out of buffers!!!!"));
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		LEAVEL(KErrOverflow);
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		}
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   163
	
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	// If here then we should have a valid pool buffer to use
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	__ASSERT_DEBUG(!ready->iMBufChain.IsEmpty(), Panic(ELinkMgrHostControllerHasOverflowedHost));
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	__ASSERT_DEBUG(ready->iCurrentHandle == KInvalidConnectionHandle, Panic(ELinkMgrHostControllerHasOverflowedHost));
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	RemoveFromBufferPool(*ready);
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	ready->iCurrentHandle = aConnHandle;
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	RMBufChain retChain;
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	retChain.Assign(ready->iMBufChain);
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   173
	
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	if (IsActive())
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		{
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		//This buffer will be reclaimed from the global pool
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		//after the one(s) we're currently trying to reclaim
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		LOG(_L8("CHostMBufPool: TakeBuffer, buffer taken while alloc outstanding: queued alloc"));
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		iWaitingAllocPool.AddLast(*ready);
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		}
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	else
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		{
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		LOG(_L8("CHostMBufPool: TakeBuffer, buffer taken"));
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		AllocNewBuffer(*ready);
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		}
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	return retChain;
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	}
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   189
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void CHostMBufPool::InvalidateByConnH(THCIConnHandle aConnHandle)
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	{
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	LOG_FUNC
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	ASSERT_DEBUG(aConnHandle != KInvalidConnectionHandle);
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   194
	
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	// We need to scan through the two pending "lists" to remove the
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	// connection handle from record so we don't try to provide a 
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	// packet completion notification (the controller already assumes
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	// the buffers are free as they are entitled to by the spec).
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   199
	
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	// The current buffer being allocated
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	if(iBufferBeingAllocd && iBufferBeingAllocd->iCurrentHandle == aConnHandle)
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		{
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		iBufferBeingAllocd->iCurrentHandle = KInvalidConnectionHandle;
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		}
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   205
	
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	// The list of buffers waiting to be allocted
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	TPoolBuffer* buffer = NULL;
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	TSglQueIter<TPoolBuffer> iter(iWaitingAllocPool);
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	while(buffer=iter++, buffer)
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		{
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		if(buffer->iCurrentHandle == aConnHandle)
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			{
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			buffer->iCurrentHandle = KInvalidConnectionHandle;
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			}
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		}
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   216
	
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	// Finally we need to purge any batched up completions if they
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	// are for this connection handle
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	if(iCurrAckHandle == aConnHandle)
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		{
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		iCurrAckHandle = KErrNotFound;
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		iCurrCompletedPackets = 0;
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		}
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	}
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   225
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void CHostMBufPool::RunL()
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	{
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	LOG_FUNC
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	LEAVEIFERRORL(iStatus.Int());
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	// We've successfully allocated a new MBufChain
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	TPoolBuffer* justAllocd = iBufferBeingAllocd;
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	iBufferBeingAllocd = NULL;
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	THCIConnHandle justAllocdHandle = justAllocd->iCurrentHandle;
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	// Return buffer to pool for re-use
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	AddToBufferPool(*justAllocd);
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	justAllocd->iCurrentHandle = KInvalidConnectionHandle;
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	// If connection handle is still valid then we need to provide a completion
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	// notification for the packet to the connection handle it was from.
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	if(justAllocdHandle != KInvalidConnectionHandle)
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		{
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		if (iCurrAckHandle == KErrNotFound)
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			{
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			// This is the first completion we have seen
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			iCurrAckHandle = justAllocdHandle;
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			}
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		ASSERT_DEBUG(iCurrAckHandle != KInvalidConnectionHandle); // just to be sure
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   250
		
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		TBool ackNow = (justAllocdHandle != iCurrAckHandle);
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   252
		
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		if (!ackNow)
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			{
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			iCurrCompletedPackets++;
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			LOG2(_L8("CHostMBufPool: CompletedPackets++ for conn: %d [->%d]"), justAllocdHandle, iCurrCompletedPackets);
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			ackNow = (iCurrCompletedPackets >= KStackACLBuffersTideMarkNum);
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			}
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		if (ackNow)
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			{
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			TInt err = KErrNone;
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   263
			
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			if (iCurrCompletedPackets > 0)
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				{
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   266
				LOG2(_L8("CHostMBufPool: Sending HostNumberOfCompletedPackets for conn: %d [%d completed]"), iCurrAckHandle, iCurrCompletedPackets);
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				//Acknowledge the completed packets
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				TRAP(err, HostNumberOfCompletedPacketsL(iCurrAckHandle, iCurrCompletedPackets));
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				//if this failed we probably couldn't alloc the memory for the command frame,
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				//the HC is still flowed off.
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   271
				__ASSERT_DEBUG(err == KErrNone, Panic(ELinkMgrCouldNotSendHostNumberOfCompletedPackets));
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				LEAVEIFERRORL(err);
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   273
				}
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   274
			
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			iCurrCompletedPackets = (justAllocdHandle != iCurrAckHandle) ? 1 : 0;
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			iCurrAckHandle = justAllocdHandle;
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			}
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		}
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   279
	
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	TryToAllocQueuedBuffer();
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	}
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   282
	
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void CHostMBufPool::TryToAllocQueuedBuffer()
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	{
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	LOG_FUNC
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   286
	if (!iWaitingAllocPool.IsEmpty() && !IsActive())
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		{
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   288
		TPoolBuffer* needsAlloc = iWaitingAllocPool.First();
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		iWaitingAllocPool.Remove(*needsAlloc);
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   290
		AllocNewBuffer(*needsAlloc);
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		}
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   292
	}
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   293
	
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void CHostMBufPool::AllocNewBuffer(TPoolBuffer& aBuffer)
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   295
	{
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	LOG_FUNC
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   297
	ASSERT_DEBUG(!iBufferBeingAllocd);
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	iBufferBeingAllocd = &aBuffer;
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   299
	iMBufRequester.Alloc(aBuffer.iMBufChain, KLinkMgrIncomingBufferSize, iStatus);
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	SetActive();
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   301
	}
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   302
	
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   303
void CHostMBufPool::HostNumberOfCompletedPacketsL(THCIConnHandle aConnH, TUint16 aNumPackets)
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	{
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   305
	RArray<THCIConnectionHandle> connHandles;
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	connHandles.AppendL(aConnH);
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   307
	CleanupClosePushL(connHandles);
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   308
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   309
	RArray<THCINumOfCompletedPackets> numPackets;
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	numPackets.AppendL(aNumPackets);
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   311
	CleanupClosePushL(numPackets);
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   312
	
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   313
	CHostNumberOfCompletedPacketsCommand* cmd = CHostNumberOfCompletedPacketsCommand::NewL(1, connHandles, numPackets);
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   314
	// Ownership of the arrays is taken by the command object.
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   315
	CleanupStack::Pop(2, &connHandles); // &numPackets, &connHandles
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diff changeset
   316
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   317
	// This is a priority command as we want to try to get this out as soon as possible (and not wait
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   318
	// for all normal control aspects to be processed).  This command shouldn't normally consume any credits
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   319
	// so as a priority command it has little impact.
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   320
	// Ownership of cmd transfered even if MhcqAddPriorityCommandL leaves
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   321
	iCmdQ.MhcqAddPriorityCommandL(cmd, *this);
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   322
	}
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   323
	
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void CHostMBufPool::MhcqcCommandEventReceived(const THCIEventBase& aEvent, const CHCICommandBase* /*aRelatedCommand*/)
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	{
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	LOG_FUNC
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   327
	// We don't expect a non-error event back because we're only sending Host_Number_of_Completed_Packet commands
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	if(aEvent.EventCode() == ECommandCompleteEvent)
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   329
		{
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   330
		const THCICommandCompleteEvent& completeEvent = THCICommandCompleteEvent::Cast(aEvent);
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   331
		if(completeEvent.CommandOpcode() == KHostNumberOfCompletedPacketsOpcode)
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   332
			{
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   333
			// a regular error for a Host_Number_Of_Completed_Packets command
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   334
			TInt err = CHciUtil::SymbianErrorCode(completeEvent.ErrorCode());
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   335
			if(err != KErrNone) // we shouldn't get a non-erroring event back, but just in case
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   336
				{
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   337
				Error(err);
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   338
				}
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   339
			}
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   340
		else // an unexpected command complete event
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   341
			{
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   342
			LOG1(_L8("CHostMBufPool: Unexpected HCI command complete event; opcode = 0x%04x"), completeEvent.CommandOpcode());
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   343
			DEBUG_PANIC_LINENUM;
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   344
			}
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   345
		}
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   346
	else // some unexpected event
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   347
		{
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   348
		LOG1(_L8("CHostMBufPool: Unexpected HCI event received; code = 0x%02x"), aEvent.EventCode());
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   349
		DEBUG_PANIC_LINENUM;
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   350
		}
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	}
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   352
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   353
void CHostMBufPool::MhcqcCommandErrored(TInt aErrorCode, const CHCICommandBase* /*aCommand*/)
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   354
	{
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   355
	LOG_FUNC
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   356
	Error(aErrorCode);
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   357
	}
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   358
	
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   359
TInt CHostMBufPool::RunError(TInt aError)
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   360
	{
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   361
	LOG_FUNC
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   362
	if(iBufferBeingAllocd)
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   363
		{
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   364
		TPoolBuffer* justFailedToAlloc = iBufferBeingAllocd;
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   365
		iBufferBeingAllocd = NULL;
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   366
		// Add to wait for alloc queue - we may get another chance
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   367
		iWaitingAllocPool.AddFirst(*justFailedToAlloc);
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   368
		}
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   369
	Error(aError);
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   370
	return KErrNone;
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   371
	}
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diff changeset
   372
	
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   373
void CHostMBufPool::Error(TInt IF_FLOGGING(aError))
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   374
	{
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   375
	LOG_FUNC
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   376
	// So there has been some internal error when handling controller to host
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   377
	// flow control.  Tough, we've done our best for now - the only real thing
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   378
	// that might be worth doing is a hard reset to start-up clean.
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   379
	LOG1(_L8("CHostMBufPool: ERROR (%d) - inbound data to the stack may stall soon"), aError);
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   380
	}
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   381
	
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diff changeset
   382
#endif