author | Mathieu Lacage <mathieu.lacage@sophia.inria.fr> |
Tue, 28 Aug 2007 13:10:18 +0200 | |
changeset 1379 | f323d2dcdaf6 |
parent 1376 | ad7e61edfb9d |
child 1383 | 12f30b7defb4 |
permissions | -rw-r--r-- |
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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */ |
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/* |
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* Copyright (c) 2005,2006 INRIA |
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* All rights reserved. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation; |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
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* Author: Craig Dowell <craigdo@ee.washington.edu> |
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* Revised: George Riley <riley@ece.gatech.edu> |
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*/ |
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#include <iostream> |
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#include <cassert> |
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#include "ns3/debug.h" |
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#include "ns3/queue.h" |
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#include "ns3/simulator.h" |
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#include "ns3/composite-trace-resolver.h" |
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#include "ns3/eui48-address.h" |
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#include "ns3/llc-snap-header.h" |
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#include "point-to-point-net-device.h" |
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#include "point-to-point-channel.h" |
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NS_DEBUG_COMPONENT_DEFINE ("PointToPointNetDevice"); |
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namespace ns3 { |
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DataRateDefaultValue PointToPointNetDevice::g_defaultRate( |
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"PointToPointLinkDataRate", |
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"The default data rate for point to point links", |
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DataRate ("10Mb/s")); |
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PointToPointTraceType::PointToPointTraceType () |
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{} |
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void |
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PointToPointTraceType::Print (std::ostream &os) const |
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{ |
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os << "dev-rx"; |
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} |
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uint16_t |
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PointToPointTraceType::GetUid (void) |
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{ |
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static uint16_t uid = AllocateUid<PointToPointTraceType> ("PointToPointTraceType"); |
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return uid; |
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} |
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std::string |
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PointToPointTraceType::GetName (void) const |
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{ |
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return "PointToPointTraceType"; |
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} |
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PointToPointNetDevice::PointToPointNetDevice (Ptr<Node> node, |
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const DataRate& rate) |
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: |
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NetDevice(node, Eui48Address::Allocate ()), |
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m_txMachineState (READY), |
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m_bps (rate), |
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m_tInterframeGap (Seconds(0)), |
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m_channel (0), |
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m_queue (0), |
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m_rxTrace () |
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{ |
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NS_DEBUG ("PointToPointNetDevice::PointToPointNetDevice (" << node << ")"); |
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// BUGBUG FIXME |
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// |
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// You _must_ support broadcast to get any sort of packet from the ARP layer. |
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EnableBroadcast (Eui48Address ("ff:ff:ff:ff:ff:ff")); |
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EnableMulticast(); |
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EnablePointToPoint(); |
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} |
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PointToPointNetDevice::~PointToPointNetDevice() |
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{ |
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NS_DEBUG ("PointToPointNetDevice::~PointToPointNetDevice ()"); |
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m_queue = 0; |
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} |
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PointToPointNetDevice::AddHeader(Packet& p, uint16_t protocolNumber) |
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{ |
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LlcSnapHeader llc; |
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llc.SetType (protocolNumber); |
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p.AddHeader (llc); |
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} |
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PointToPointNetDevice::ProcessHeader(Packet& p, uint16_t& param) |
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{ |
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LlcSnapHeader llc; |
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p.RemoveHeader (llc); |
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param = llc.GetType (); |
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return true; |
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} |
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void PointToPointNetDevice::DoDispose() |
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{ |
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m_channel = 0; |
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NetDevice::DoDispose (); |
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} |
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void PointToPointNetDevice::SetDataRate(const DataRate& bps) |
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{ |
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m_bps = bps; |
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} |
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void PointToPointNetDevice::SetInterframeGap(const Time& t) |
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{ |
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m_tInterframeGap = t; |
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} |
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bool PointToPointNetDevice::SendTo (const Packet& packet, const Address& dest, |
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uint16_t protocolNumber) |
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{ |
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Packet p = packet; |
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NS_DEBUG ("PointToPointNetDevice::SendTo (" << &p << ", " << &dest << ")"); |
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NS_DEBUG ("PointToPointNetDevice::SendTo (): UID is " << p.GetUid () << ")"); |
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// GFR Comment. Why is this an assertion? Can't a link legitimately |
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// "go down" during the simulation? Shouldn't we just wait for it |
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// to come back up? |
414 | 135 |
NS_ASSERT (IsLinkUp ()); |
1167 | 136 |
AddHeader(p, protocolNumber); |
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// |
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// This class simulates a point to point device. In the case of a serial |
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// link, this means that we're simulating something like a UART. |
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// |
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// |
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// If there's a transmission in progress, we enque the packet for later |
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// trnsmission; otherwise we send it now. |
1167 | 145 |
if (m_txMachineState == READY) |
146 |
{ |
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return TransmitStart (p); |
|
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} |
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else |
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{ |
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return m_queue->Enqueue(p); |
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} |
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} |
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bool |
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PointToPointNetDevice::TransmitStart (Packet &p) |
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{ |
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NS_DEBUG ("PointToPointNetDevice::TransmitStart (" << &p << ")"); |
414 | 159 |
NS_DEBUG ( |
160 |
"PointToPointNetDevice::TransmitStart (): UID is " << p.GetUid () << ")"); |
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// |
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// This function is called to start the process of transmitting a packet. |
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// We need to tell the channel that we've started wiggling the wire and |
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// schedule an event that will be executed when the transmission is complete. |
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// |
414 | 166 |
NS_ASSERT_MSG(m_txMachineState == READY, "Must be READY to transmit"); |
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m_txMachineState = BUSY; |
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Time txTime = Seconds (m_bps.CalculateTxTime(p.GetSize())); |
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Time txCompleteTime = txTime + m_tInterframeGap; |
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NS_DEBUG ("PointToPointNetDevice::TransmitStart (): " << |
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"Schedule TransmitCompleteEvent in " << |
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txCompleteTime.GetSeconds () << "sec"); |
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// Schedule the tx complete event |
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Simulator::Schedule (txCompleteTime, |
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&PointToPointNetDevice::TransmitComplete, |
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this); |
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return m_channel->TransmitStart(p, this, txTime); |
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} |
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void PointToPointNetDevice::TransmitComplete (void) |
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{ |
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NS_DEBUG ("PointToPointNetDevice::TransmitCompleteEvent ()"); |
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// |
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// This function is called to finish the process of transmitting a packet. |
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// We need to tell the channel that we've stopped wiggling the wire and |
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// get the next packet from the queue. If the queue is empty, we are |
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// done, otherwise transmit the next packet. |
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189 |
// |
414 | 190 |
NS_ASSERT_MSG(m_txMachineState == BUSY, "Must be BUSY if transmitting"); |
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m_txMachineState = READY; |
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Packet p; |
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if (!m_queue->Dequeue(p)) return; // Nothing to do at this point |
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194 |
TransmitStart(p); |
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} |
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196 |
|
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Ptr<TraceResolver> |
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198 |
PointToPointNetDevice::GetTraceResolver (void) |
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{ |
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Ptr<CompositeTraceResolver> resolver = Create<CompositeTraceResolver> (); |
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resolver->AddChild ("queue", m_queue); |
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resolver->AddSource ("rx", |
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TraceDoc ("receive MAC packet", |
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204 |
"const Packet &", "packet received"), |
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m_rxTrace, |
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206 |
PointToPointTraceType ()); |
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resolver->SetParent (NetDevice::GetTraceResolver ()); |
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208 |
return resolver; |
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209 |
} |
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210 |
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bool PointToPointNetDevice::Attach (Ptr<PointToPointChannel> ch) |
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{ |
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NS_DEBUG ("PointToPointNetDevice::Attach (" << &ch << ")"); |
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m_channel = ch; |
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m_channel->Attach(this); |
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m_bps = m_channel->GetDataRate (); |
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219 |
// GFR Comment. Below is definitely wrong. Interframe gap |
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// is unrelated to channel delay. |
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//m_tInterframeGap = m_channel->GetDelay (); |
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222 |
|
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223 |
/* |
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224 |
* For now, this device is up whenever a channel is attached to it. |
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225 |
* In fact, it should become up only when the second device |
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226 |
* is attached to the channel. So, there should be a way for |
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227 |
* a PointToPointChannel to notify both of its attached devices |
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* that the channel is 'complete', hence that the devices are |
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229 |
* up, hence that they can call NotifyLinkUp. |
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230 |
*/ |
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231 |
NotifyLinkUp (); |
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232 |
return true; |
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233 |
} |
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void PointToPointNetDevice::AddQueue (Ptr<Queue> q) |
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{ |
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NS_DEBUG ("PointToPointNetDevice::AddQueue (" << q << ")"); |
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|
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m_queue = q; |
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} |
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void PointToPointNetDevice::Receive (Packet& p) |
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{ |
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NS_DEBUG ("PointToPointNetDevice::Receive (" << &p << ")"); |
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uint16_t protocol = 0; |
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Packet packet = p; |
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m_rxTrace (packet); |
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ProcessHeader(packet, protocol); |
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ForwardUp (packet, protocol, GetBroadcast ()); |
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} |
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|
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Ptr<Queue> PointToPointNetDevice::GetQueue(void) const |
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{ |
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return m_queue; |
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} |
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|
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Ptr<Channel> PointToPointNetDevice::DoGetChannel(void) const |
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{ |
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return m_channel; |
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} |
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|
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bool PointToPointNetDevice::DoNeedsArp (void) const |
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{ |
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return false; |
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} |
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} // namespace ns3 |