--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/devices/point-to-point/p2p-net-device.cc Fri Jul 27 20:17:23 2007 +0200
@@ -0,0 +1,221 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2005,2006 INRIA
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Craig Dowell <craigdo@ee.washington.edu>
+ * Revised: George Riley <riley@ece.gatech.edu>
+ */
+
+#include <iostream>
+#include <cassert>
+#include "ns3/debug.h"
+#include "ns3/queue.h"
+#include "ns3/simulator.h"
+#include "ns3/composite-trace-resolver.h"
+#include "p2p-net-device.h"
+#include "p2p-channel.h"
+
+NS_DEBUG_COMPONENT_DEFINE ("PointToPointNetDevice");
+
+namespace ns3 {
+
+DataRateDefaultValue PointToPointNetDevice::g_defaultRate(
+ "PointToPointLinkDataRate",
+ "The default data rate for point to point links",
+ DataRate ("10Mb/s"));
+
+ PointToPointNetDevice::PointToPointNetDevice (Ptr<Node> node,
+ const DataRate& rate)
+:
+ NetDevice(node, MacAddress (6)),
+ m_txMachineState (READY),
+ m_bps (rate),
+ m_tInterframeGap (Seconds(0)),
+ m_channel (0),
+ m_queue (0),
+ m_rxTrace ()
+{
+ NS_DEBUG ("PointToPointNetDevice::PointToPointNetDevice (" << node << ")");
+
+ // BUGBUG FIXME
+ //
+ // You _must_ support broadcast to get any sort of packet from the ARP layer.
+ EnableBroadcast (MacAddress ("ff:ff:ff:ff:ff:ff"));
+ EnableMulticast();
+ EnablePointToPoint();
+}
+
+PointToPointNetDevice::~PointToPointNetDevice()
+{
+ NS_DEBUG ("PointToPointNetDevice::~PointToPointNetDevice ()");
+ m_queue = 0;
+}
+
+void PointToPointNetDevice::DoDispose()
+{
+ m_channel = 0;
+ NetDevice::DoDispose ();
+}
+
+
+void PointToPointNetDevice::SetDataRate(const DataRate& bps)
+{
+ m_bps = bps;
+}
+
+void PointToPointNetDevice::SetInterframeGap(const Time& t)
+{
+ m_tInterframeGap = t;
+}
+
+bool PointToPointNetDevice::SendTo (Packet& p, const MacAddress& dest)
+{
+ NS_DEBUG ("PointToPointNetDevice::SendTo (" << &p << ", " << &dest << ")");
+ NS_DEBUG ("PointToPointNetDevice::SendTo (): UID is " << p.GetUid () << ")");
+
+ // GFR Comment. Why is this an assertion? Can't a link legitimately
+ // "go down" during the simulation? Shouldn't we just wait for it
+ // to come back up?
+ NS_ASSERT (IsLinkUp ());
+
+//
+// This class simulates a point to point device. In the case of a serial
+// link, this means that we're simulating something like a UART.
+//
+//
+// If there's a transmission in progress, we enque the packet for later
+// trnsmission; otherwise we send it now.
+ if (m_txMachineState == READY)
+ {
+ return TransmitStart (p);
+ }
+ else
+ {
+ return m_queue->Enqueue(p);
+ }
+}
+
+ bool
+PointToPointNetDevice::TransmitStart (Packet &p)
+{
+ NS_DEBUG ("PointToPointNetDevice::TransmitStart (" << &p << ")");
+ NS_DEBUG (
+ "PointToPointNetDevice::TransmitStart (): UID is " << p.GetUid () << ")");
+//
+// This function is called to start the process of transmitting a packet.
+// We need to tell the channel that we've started wiggling the wire and
+// schedule an event that will be executed when the transmission is complete.
+//
+ NS_ASSERT_MSG(m_txMachineState == READY, "Must be READY to transmit");
+ m_txMachineState = BUSY;
+ Time txTime = Seconds (m_bps.CalculateTxTime(p.GetSize()));
+ Time txCompleteTime = txTime + m_tInterframeGap;
+
+ NS_DEBUG ("PointToPointNetDevice::TransmitStart (): " <<
+ "Schedule TransmitCompleteEvent in " <<
+ txCompleteTime.GetSeconds () << "sec");
+ // Schedule the tx complete event
+ Simulator::Schedule (txCompleteTime,
+ &PointToPointNetDevice::TransmitComplete,
+ this);
+ return m_channel->TransmitStart(p, this, txTime);
+}
+
+void PointToPointNetDevice::TransmitComplete (void)
+{
+ NS_DEBUG ("PointToPointNetDevice::TransmitCompleteEvent ()");
+//
+// This function is called to finish the process of transmitting a packet.
+// We need to tell the channel that we've stopped wiggling the wire and
+// get the next packet from the queue. If the queue is empty, we are
+// done, otherwise transmit the next packet.
+//
+ NS_ASSERT_MSG(m_txMachineState == BUSY, "Must be BUSY if transmitting");
+ m_txMachineState = READY;
+ Packet p;
+ if (!m_queue->Dequeue(p)) return; // Nothing to do at this point
+ TransmitStart(p);
+}
+
+TraceResolver* PointToPointNetDevice::DoCreateTraceResolver (
+ TraceContext const &context)
+{
+ CompositeTraceResolver *resolver = new CompositeTraceResolver (context);
+ resolver->Add ("queue",
+ MakeCallback (&Queue::CreateTraceResolver, PeekPointer (m_queue)),
+ PointToPointNetDevice::QUEUE);
+ resolver->Add ("rx",
+ m_rxTrace,
+ PointToPointNetDevice::RX);
+ return resolver;
+}
+
+bool PointToPointNetDevice::Attach (Ptr<PointToPointChannel> ch)
+{
+ NS_DEBUG ("PointToPointNetDevice::Attach (" << &ch << ")");
+
+ m_channel = ch;
+
+ m_channel->Attach(this);
+ m_bps = m_channel->GetDataRate ();
+ // GFR Comment. Below is definitely wrong. Interframe gap
+ // is unrelated to channel delay.
+ //m_tInterframeGap = m_channel->GetDelay ();
+
+ /*
+ * For now, this device is up whenever a channel is attached to it.
+ * In fact, it should become up only when the second device
+ * is attached to the channel. So, there should be a way for
+ * a PointToPointChannel to notify both of its attached devices
+ * that the channel is 'complete', hence that the devices are
+ * up, hence that they can call NotifyLinkUp.
+ */
+ NotifyLinkUp ();
+ return true;
+}
+
+void PointToPointNetDevice::AddQueue (Ptr<Queue> q)
+{
+ NS_DEBUG ("PointToPointNetDevice::AddQueue (" << q << ")");
+
+ m_queue = q;
+}
+
+void PointToPointNetDevice::Receive (Packet& p)
+{
+ NS_DEBUG ("PointToPointNetDevice::Receive (" << &p << ")");
+
+ m_rxTrace (p);
+ ForwardUp (p);
+}
+
+Ptr<Queue> PointToPointNetDevice::GetQueue(void) const
+{
+ return m_queue;
+}
+
+Ptr<Channel> PointToPointNetDevice::DoGetChannel(void) const
+{
+ return m_channel;
+}
+
+bool PointToPointNetDevice::DoNeedsArp (void) const
+{
+ return false;
+}
+
+} // namespace ns3