private int processData(CUnit unit)
{
CPacket packet = unit.m_Packet;
// Just heard from the peer, reset the expiration count.
m_iEXPCount = 1;
m_ullEXPInt = m_ullMinEXPInt;
if (CSeqNo.incseq(m_iSndCurrSeqNo) == m_iSndLastAck)
{
CClock.rdtsc(m_ullNextEXPTime);
if (!m_pCC.m_bUserDefinedRTO)
m_ullNextEXPTime += m_ullEXPInt;
else
m_ullNextEXPTime += m_pCC.m_iRTO * m_ullCPUFrequency;
}
m_pCC.onPktReceived(&packet);
++ m_iPktCount;
// update time information
m_pRcvTimeWindow.onPktArrival();
// check if it is probing packet pair
if (0 == (packet.m_iSeqNo & 0xF))
m_pRcvTimeWindow.probe1Arrival();
else if (1 == (packet.m_iSeqNo & 0xF))
m_pRcvTimeWindow.probe2Arrival();
++ m_llTraceRecv;
++ m_llRecvTotal;
Int32 offset = CSeqNo.seqoff(m_iRcvLastAck, packet.m_iSeqNo);
if ((offset < 0) || (offset >= m_pRcvBuffer.getAvailBufSize()))
return -1;
if (m_pRcvBuffer.addData(unit, offset) < 0)
return -1;
// Loss detection.
if (CSeqNo.seqcmp(packet.m_iSeqNo, CSeqNo.incseq(m_iRcvCurrSeqNo)) > 0)
{
// If loss found, insert them to the receiver loss list
m_pRcvLossList.insert(CSeqNo.incseq(m_iRcvCurrSeqNo), CSeqNo.decseq(packet.m_iSeqNo));
// pack loss list for NAK
Int32[] lossdata = new int[2];
lossdata[0] = CSeqNo.incseq(m_iRcvCurrSeqNo) | 0x80000000;
lossdata[1] = CSeqNo.decseq(packet.m_iSeqNo);
// Generate loss report immediately.
sendCtrl(3, null, lossdata, (CSeqNo.incseq(m_iRcvCurrSeqNo) == CSeqNo.decseq(packet.m_iSeqNo)) ? 1 : 2);
m_iTraceRcvLoss += CSeqNo.seqlen(m_iRcvCurrSeqNo, packet.m_iSeqNo) - 2;
}
// This is not a regular fixed size packet...
//an irregular sized packet usually indicates the end of a message, so send an ACK immediately
if (packet.getLength() != m_iPayloadSize)
CClock.rdtsc(m_ullNextACKTime);
// Update the current largest sequence number that has been received.
// Or it is a retransmitted packet, remove it from receiver loss list.
if (CSeqNo.seqcmp(packet.m_iSeqNo, m_iRcvCurrSeqNo) > 0)
m_iRcvCurrSeqNo = packet.m_iSeqNo;
else
m_pRcvLossList.remove(packet.m_iSeqNo);
return 0;
}
// Functionality:
// Increase (double) the unit queue size.
// Parameters:
// None.
// Returned value:
// 0: success, -1: failure.
public int increase()
{
// adjust/correct m_iCount
int real_count = 0;
CQEntry p = m_pQEntry;
while (p != null)
{
CUnit u = p.m_pUnit;
for (CUnit end = u + p.m_iSize; u != end; ++u)
if (u.m_iFlag != 0)
++real_count;
if (p == m_pLastQueue)
p = null;
else
p = p.m_pNext;
}
m_iCount = real_count;
if ((double)(m_iCount) / m_iSize < 0.9)
return -1;
CQEntry tempq = null;
CUnit tempu = null;
IntPtr tempb = IntPtr.Zero;
// all queues have the same size
int size = m_pQEntry.m_iSize;
try
{
tempq = new CQEntry();
tempu = new CUnit[size];
tempb = new char[size * m_iMSS];
}
catch (Exception e)
{
tempq.Dispose();
tempu.Dispose();
tempb.Dispose();
//delete tempq;
//delete [] tempu;
//delete [] tempb;
return -1;
}
for (int i = 0; i < size; ++i)
{
tempu[i].m_iFlag = 0;
tempu[i].m_Packet.m_pcData = tempb + i * m_iMSS;
}
tempq.m_pUnit = tempu;
tempq.m_pBuffer = tempb;
tempq.m_iSize = size;
m_pLastQueue.m_pNext = tempq;
m_pLastQueue = tempq;
m_pLastQueue.m_pNext = m_pQEntry;
m_iSize += size;
return 0;
}
// Functionality:
// find an available unit for incoming packet.
// Parameters:
// None.
// Returned value:
// Pointer to the available unit, null if not found.
public CUnit getNextAvailUnit()
{
if (m_iCount * 10 > m_iSize * 9)
increase();
if (m_iCount >= m_iSize)
return null;
CQEntry entrance = m_pCurrQueue;
do
{
for (CUnit sentinel = m_pCurrQueue.m_pUnit + m_pCurrQueue.m_iSize - 1; m_pAvailUnit != sentinel; ++m_pAvailUnit)
if (m_pAvailUnit.m_iFlag == 0)
return m_pAvailUnit;
if (m_pCurrQueue.m_pUnit.m_iFlag == 0)
{
m_pAvailUnit = m_pCurrQueue.m_pUnit;
return m_pAvailUnit;
}
m_pCurrQueue = m_pCurrQueue.m_pNext;
m_pAvailUnit = m_pCurrQueue.m_pUnit;
} while (m_pCurrQueue != entrance);
increase();
return null;
}
public AddressFamily m_iIPversion; // IP version
#region Constructor - Destructor
//public CUnitQueue()
//{
//}
//~CUnitQueue()
//{
// CQEntry p = m_pQEntry;
// while (p != null)
// {
// CQEntry q = p;
// if (p == m_pLastQueue)
// p = null;
// else
// p = p.m_pNext;
// q.Dispose();
// }
//}
#endregion
// Functionality:
// Initialize the unit queue.
// Parameters:
// 1) [in] size: queue size
// 2) [in] mss: maximum segment size
// 3) [in] version: IP version
// Returned value:
// 0: success, -1: failure.
public int init(int size, int mss, AddressFamily version)
{
CQEntry tempq = null;
CUnit tempu = null;
IntPtr tempb = IntPtr.Zero;
try
{
tempq = new CQEntry();
tempu = new CUnit[size];
tempb = new char[size * mss];
}
catch (Exception e)
{
//tempq.Dispose();
// tempu.Dispose();
// tempb.Dispose();
return -1;
}
for (int i = 0; i < size; ++i)
{
tempu[i].m_iFlag = 0;
tempu[i].m_Packet.m_pcData = tempb + i * mss;
}
tempq.m_pUnit = tempu;
tempq.m_pBuffer = tempb;
tempq.m_iSize = size;
m_pQEntry = m_pCurrQueue = m_pLastQueue = tempq;
m_pQEntry.m_pNext = m_pQEntry;
m_pAvailUnit = m_pCurrQueue.m_pUnit;
m_iSize = size;
m_iMSS = mss;
m_iIPversion = version;
return 0;
}