src/dev/etherbus.cc

   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 an ethernet hub
  33  */
  34
  35 #include <cmath>
  36 #include <deque>
  37 #include <string>
  38 #include <vector>
  39
  40 #include "base/trace.hh"
  41 #include "dev/etherbus.hh"
  42 #include "dev/etherdump.hh"
  43 #include "dev/etherint.hh"
  44 #include "dev/etherpkt.hh"
  45 #include "params/EtherBus.hh"
  46 #include "sim/core.hh"
  47
  48 using namespace std;
  49
  50 EtherBus::EtherBus(const Params *p)
  51     : EtherObject(p), ticksPerByte(p->speed), loopback(p->loopback),
  52       event(&mainEventQueue, this), sender(0), dump(p->dump)
  53 {
  54 }
  55
  56 void
  57 EtherBus::txDone()
  58 {
  59     devlist_t::iterator i = devlist.begin();
  60     devlist_t::iterator end = devlist.end();
  61
  62     DPRINTF(Ethernet, "ethernet packet received: length=%d\n", packet->length);
  63     DDUMP(EthernetData, packet->data, packet->length);
  64
  65     while (i != end) {
  66         if (loopback || *i != sender)
  67             (*i)->sendPacket(packet);
  68         ++i;
  69     }
  70
  71     sender->sendDone();
  72
  73     if (dump)
  74         dump->dump(packet);
  75
  76     sender = 0;
  77     packet = 0;
  78 }
  79
  80 EtherInt*
  81 EtherBus::getEthPort(const std::string &if_name, int idx)
  82 {
  83     panic("Etherbus doesn't work\n");
  84 }
  85
  86 bool
  87 EtherBus::send(EtherInt *sndr, EthPacketPtr &pkt)
  88 {
  89     if (busy()) {
  90         DPRINTF(Ethernet, "ethernet packet not sent, bus busy\n", curTick);
  91         return false;
  92     }
  93
  94     DPRINTF(Ethernet, "ethernet packet sent: length=%d\n", pkt->length);
  95     DDUMP(EthernetData, pkt->data, pkt->length);
  96
  97     packet = pkt;
  98     sender = sndr;
  99     int delay = (int)ceil(((double)pkt->length * ticksPerByte) + 1.0);
 100     DPRINTF(Ethernet, "scheduling packet: delay=%d, (rate=%f)\n",
 101             delay, ticksPerByte);
 102     event.schedule(curTick + delay);
 103
 104     return true;
 105 }
 106
 107 EtherBus *
 108 EtherBusParams::create()
 109 {
 110     return new EtherBus(this);
 111 }