src/dev/etherlink.hh

   1 /*
   2  * Copyright (c) 2002-2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Nathan Binkert
  29  */
  30
  31 /* @file
  32  * Device module for modelling a fixed bandwidth full duplex ethernet link
  33  */
  34
  35 #ifndef __DEV_ETHERLINK_HH__
  36 #define __DEV_ETHERLINK_HH__
  37
  38 #include "base/types.hh"
  39 #include "dev/etherint.hh"
  40 #include "dev/etherobject.hh"
  41 #include "dev/etherpkt.hh"
  42 #include "params/EtherLink.hh"
  43 #include "params/EtherLink.hh"
  44 #include "sim/eventq.hh"
  45 #include "sim/sim_object.hh"
  46
  47 class EtherDump;
  48 class Checkpoint;
  49 /*
  50  * Model for a fixed bandwidth full duplex ethernet link
  51  */
  52 class EtherLink : public EtherObject
  53 {
  54   protected:
  55     class Interface;
  56
  57     friend class LinkDelayEvent;
  58      /*
  59       * Model for a single uni-directional link
  60       */
  61     class Link
  62     {
  63       protected:
  64         std::string objName;
  65
  66         EtherLink *parent;
  67         int number;
  68
  69         Interface *txint;
  70         Interface *rxint;
  71
  72         double ticksPerByte;
  73         Tick linkDelay;
  74         Tick delayVar;
  75         EtherDump *dump;
  76
  77       protected:
  78         /*
  79          * Transfer is complete
  80          */
  81         EthPacketPtr packet;
  82         void txDone();
  83         typedef EventWrapper<Link, &Link::txDone> DoneEvent;
  84         friend void DoneEvent::process();
  85         DoneEvent doneEvent;
  86
  87         friend class LinkDelayEvent;
  88         void txComplete(EthPacketPtr packet);
  89
  90       public:
  91         Link(const std::string &name, EtherLink *p, int num,
  92              double rate, Tick delay, Tick delay_var, EtherDump *dump);
  93         ~Link() {}
  94
  95         const std::string name() const { return objName; }
  96
  97         bool busy() const { return (bool)packet; }
  98         bool transmit(EthPacketPtr packet);
  99
 100         void setTxInt(Interface *i) { assert(!txint); txint = i; }
 101         void setRxInt(Interface *i) { assert(!rxint); rxint = i; }
 102
 103         void serialize(const std::string &base, std::ostream &os);
 104         void unserialize(const std::string &base, Checkpoint *cp,
 105                                  const std::string &section);
 106     };
 107
 108     /*
 109      * Interface at each end of the link
 110      */
 111     class Interface : public EtherInt
 112     {
 113       private:
 114         Link *txlink;
 115
 116       public:
 117         Interface(const std::string &name, Link *txlink, Link *rxlink);
 118         bool recvPacket(EthPacketPtr packet) { return txlink->transmit(packet); }
 119         void sendDone() { peer->sendDone(); }
 120         bool isBusy() { return txlink->busy(); }
 121     };
 122
 123     Link *link[2];
 124     Interface *interface[2];
 125
 126   public:
 127     typedef EtherLinkParams Params;
 128     EtherLink(const Params *p);
 129     virtual ~EtherLink();
 130
 131     const Params *
 132     params() const
 133     {
 134         return dynamic_cast<const Params *>(_params);
 135     }
 136
 137     virtual EtherInt *getEthPort(const std::string &if_name, int idx);
 138
 139     virtual void serialize(std::ostream &os);
 140     virtual void unserialize(Checkpoint *cp, const std::string &section);
 141
 142 };
 143
 144 #endif // __ETHERLINK_HH__