src/devices/p2p/p2p-net-device.cc
author Craig Dowell
Tue, 27 Mar 2007 13:04:11 -0700
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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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
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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 "p2p-net-device.h"
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#include "p2p-channel.h"
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NS_DEBUG_COMPONENT_DEFINE ("PointToPointNetDevice");
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namespace ns3 {
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PointToPointNetDevice::PointToPointNetDevice(Node* node) 
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: 
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  NetDevice(node, MacAddress("00:00:00:00:00:00")), 
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  m_txMachineState(READY),
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  m_bps (DataRate(0xffffffff)),
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  m_channel(0), 
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  m_queue(0)
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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 (MacAddress ("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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}
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  void 
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PointToPointNetDevice::SetDataRate(DataRate bps)
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{
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  m_bps = bps;
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}
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  void 
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PointToPointNetDevice::SetInterframeGap(Time t)
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{
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  m_tInterframeGap = t;
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}
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  bool
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PointToPointNetDevice::SendTo (Packet& p, const MacAddress& dest)
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{
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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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  assert (IsLinkUp ());
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#ifdef NOTYET
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    struct NetDevicePacketDestAddress tag;
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    tag.address = address;
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    p.AddTag (tag);
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#endif
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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.  This is
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// not a requirement for a point-to-point link, but it's a typical model for
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// the device.  
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//
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// Generally, a real device will have a list of pending packets to transmit.  
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// An on-device CPU frees the main CPU(s) of the details of what is happening
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// in the device and feeds the USART.  The main CPU basically just sees the 
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// list of packets -- it puts packets into the list, and the device frees the
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// packets when they are transmitted.
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//
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// In the case of our virtual device here, the queue pointed to by m_queue
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// corresponds to this list.  The main CPU adds packets to the list by 
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// calling this method and when the device completes a send, the packets are
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// freed in an "interrupt" service routine.
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//
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// We're going to do the same thing here.  So first of all, the incoming packet
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// goes onto our queue if possible.  If the queue can't handle it, there's
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// nothing to be done.
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//
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    if (m_queue->Enqueue(p) == false )
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      {
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        return false;
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      }
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//
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// If there's a transmission in progress, the "interrupt" will keep the
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// transmission process going.  If the device is idle, we need to start a
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// transmission.
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//
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// In the real world, the USART runs until it finishes sending bits, and then
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// pulls on the device's transmit complete interrupt wire.  At the same time,
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// the electrons from the last wiggle of the wire are busy propagating down
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// the wire.  In the case of a long speed-of-light delay in the wire, we could
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// conceivably start transmitting the next packet before the end of the 
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// previously sent data has even reached the end of the wire.  This situation
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// is usually avoided (like the plague) and an "interframe gap" is introduced.
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// This is usually the round-trip delay on the channel plus some hard-to-
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// quantify receiver turn-around time (the time required for the receiver
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// to process the last frame and prepare for reception of the next).
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//
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// So, if the transmit machine is ready, we need to schedule a transmit 
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// complete event (at which time we tell the channel we're no longer sending
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// bits).  A separate transmit ready event (at which time the transmitter 
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// becomes ready to start sending bits again is scheduled there).  Finally, 
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// we tell the channel (via TransmitStart ()) that we've started wiggling the 
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// wire and bits are coming out.
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//
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// If the transmit machine is not ready, we just leave and the transmit ready
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// event we know is coming will kick-start the transmit process.
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//
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    if (m_txMachineState == READY) 
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      {
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        return TransmitStart (p);
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      }
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    return true;
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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 << ")");
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  NS_DEBUG ("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 it's time to tell the 
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// channel that we're done wiggling the wire.
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//
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  NS_ASSERT(m_txMachineState == READY && "Must be READY to transmit");
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  m_txMachineState = BUSY;
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  Time tEvent = Seconds (m_bps.CalculateTxTime(p.GetSize()));
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  NS_DEBUG ("PointToPointNetDevice::TransmitStart (): " <<
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    "Schedule TransmitCompleteEvent in " << 
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    tEvent.GetSeconds () << "sec");
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  Simulator::Schedule (tEvent, 
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                       &PointToPointNetDevice::TransmitCompleteEvent, 
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                       this);
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  return m_channel->TransmitStart (p, this); 
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}
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  void
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PointToPointNetDevice::TransmitCompleteEvent (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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// schedule an event that will be executed when it's time to re-enable
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// the transmitter after the interframe gap.
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//
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  NS_ASSERT(m_txMachineState == BUSY && "Must be BUSY if transmitting");
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  m_txMachineState = GAP;
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  Packet p;
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  bool found = m_queue->Dequeue (p);
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  NS_ASSERT(found && "Packet must be on queue if transmitted");
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  NS_DEBUG ("PointToPointNetDevice::TransmitCompleteEvent (): Pkt UID is " << 
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            p.GetUid () << ")");
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  m_channel->TransmitEnd (p, this); 
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  NS_DEBUG (
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    "PointToPointNetDevice::TransmitCompleteEvent (): " <<
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    "Schedule TransmitReadyEvent in "
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    << m_tInterframeGap.GetSeconds () << "sec");
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  Simulator::Schedule (m_tInterframeGap, 
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                       &PointToPointNetDevice::TransmitReadyEvent, 
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                       this);
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}
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  void
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PointToPointNetDevice::TransmitReadyEvent (void)
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{
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  NS_DEBUG ("PointToPointNetDevice::TransmitReadyEvent ()");
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//
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// This function is called to enable the transmitter after the interframe
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// gap has passed.  If there are pending transmissions, we use this opportunity
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// to start the next transmit.
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//
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  NS_ASSERT(m_txMachineState == GAP && "Must be in interframe gap");
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  m_txMachineState = READY;
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  if (m_queue->IsEmpty())
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    {
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      return;
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    }
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  else
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    {
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      Packet p;
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      bool found = m_queue->Peek (p);
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      NS_ASSERT(found && "IsEmpty false but no Packet on queue?");
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      TransmitStart (p);
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    }
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}
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TraceResolver *
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PointToPointNetDevice::DoCreateTraceResolver (TraceContext const &context)
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{
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  CompositeTraceResolver *resolver = new CompositeTraceResolver (context);
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  resolver->Add ("queue", 
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                 MakeCallback (&Queue::CreateTraceResolver, m_queue),
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                 PointToPointNetDevice::QUEUE);
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  resolver->Add ("rx",
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                 m_rxTrace,
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                 PointToPointNetDevice::RX);
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  return resolver;
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}
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bool
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PointToPointNetDevice::Attach (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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  m_tInterframeGap = m_channel->GetDelay ();
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  /* 
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   * For now, this device is up whenever a channel is attached to it.
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   * In fact, it should become up only when the second device
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   * is attached to the channel. So, there should be a way for
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   * 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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   * up, hence that they can call NotifyLinkUp. 
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   */
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  NotifyLinkUp ();
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  return true;
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}
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void
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PointToPointNetDevice::AddQueue (Queue* q)
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{
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  NS_DEBUG ("PointToPointNetDevice::AddQueue (" << q << ")");
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  m_queue = q;
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}
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void
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PointToPointNetDevice::Receive (Packet& p)
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{
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  // ignore return value for now.
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  NS_DEBUG ("PointToPointNetDevice::Receive (" << &p << ")");
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  m_rxTrace (p);
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  ForwardUp (p);
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}
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Queue* 
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PointToPointNetDevice::GetQueue(void) const 
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{ 
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    return m_queue;
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}
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PointToPointChannel* 
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PointToPointNetDevice::GetChannel(void) const 
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{ 
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    return m_channel;
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}
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} // namespace ns3