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 "debug/Ethernet.hh"
  42 #include "debug/EthernetData.hh"
  43 #include "dev/etherbus.hh"
  44 #include "dev/etherdump.hh"
  45 #include "dev/etherint.hh"
  46 #include "dev/etherpkt.hh"
  47 #include "params/EtherBus.hh"
  48 #include "sim/core.hh"
  49
  50 using namespace std;
  51
  52 EtherBus::EtherBus(const Params *p)
  53     : EtherObject(p), ticksPerByte(p->speed), loopback(p->loopback),
  54       event(this), sender(0), dump(p->dump)
  55 {
  56 }
  57
  58 void
  59 EtherBus::txDone()
  60 {
  61     devlist_t::iterator i = devlist.begin();
  62     devlist_t::iterator end = devlist.end();
  63
  64     DPRINTF(Ethernet, "ethernet packet received: length=%d\n", packet->length);
  65     DDUMP(EthernetData, packet->data, packet->length);
  66
  67     while (i != end) {
  68         if (loopback || *i != sender)
  69             (*i)->sendPacket(packet);
  70         ++i;
  71     }
  72
  73     sender->sendDone();
  74
  75     if (dump)
  76         dump->dump(packet);
  77
  78     sender = 0;
  79     packet = 0;
  80 }
  81
  82 EtherInt*
  83 EtherBus::getEthPort(const std::string &if_name, int idx)
  84 {
  85     panic("Etherbus doesn't work\n");
  86 }
  87
  88 bool
  89 EtherBus::send(EtherInt *sndr, EthPacketPtr &pkt)
  90 {
  91     if (busy()) {
  92         DPRINTF(Ethernet, "ethernet packet not sent, bus busy\n", curTick());
  93         return false;
  94     }
  95
  96     DPRINTF(Ethernet, "ethernet packet sent: length=%d\n", pkt->length);
  97     DDUMP(EthernetData, pkt->data, pkt->length);
  98
  99     packet = pkt;
 100     sender = sndr;
 101     int delay = (int)ceil(((double)pkt->length * ticksPerByte) + 1.0);
 102     DPRINTF(Ethernet, "scheduling packet: delay=%d, (rate=%f)\n",
 103             delay, ticksPerByte);
 104     schedule(event, curTick() + delay);
 105
 106     return true;
 107 }
 108
 109 EtherBus *
 110 EtherBusParams::create()
 111 {
 112     return new EtherBus(this);
 113 }