src/dev/net/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 #include "dev/net/etherbus.hh"
  35
  36 #include <cmath>
  37 #include <deque>
  38 #include <string>
  39 #include <vector>
  40
  41 #include "base/logging.hh"
  42 #include "base/trace.hh"
  43 #include "debug/Ethernet.hh"
  44 #include "debug/EthernetData.hh"
  45 #include "dev/net/etherdump.hh"
  46 #include "dev/net/etherint.hh"
  47 #include "dev/net/etherpkt.hh"
  48 #include "params/EtherBus.hh"
  49 #include "sim/core.hh"
  50
  51 using namespace std;
  52
  53 EtherBus::EtherBus(const Params *p)
  54     : SimObject(p), ticksPerByte(p->speed), loopback(p->loopback),
  55       event([this]{ txDone(); }, "ethernet bus completion"),
  56       sender(0), dump(p->dump)
  57 {
  58 }
  59
  60 void
  61 EtherBus::txDone()
  62 {
  63     devlist_t::iterator i = devlist.begin();
  64     devlist_t::iterator end = devlist.end();
  65
  66     DPRINTF(Ethernet, "ethernet packet received: length=%d\n", packet->length);
  67     DDUMP(EthernetData, packet->data, packet->length);
  68
  69     while (i != end) {
  70         if (loopback || *i != sender)
  71             (*i)->sendPacket(packet);
  72         ++i;
  73     }
  74
  75     sender->sendDone();
  76
  77     if (dump)
  78         dump->dump(packet);
  79
  80     sender = 0;
  81     packet = 0;
  82 }
  83
  84 Port &
  85 EtherBus::getPort(const std::string &if_name, PortID idx)
  86 {
  87     panic("Etherbus doesn't work\n");
  88 }
  89
  90 bool
  91 EtherBus::send(EtherInt *sndr, EthPacketPtr &pkt)
  92 {
  93     if (busy()) {
  94         DPRINTF(Ethernet, "ethernet packet not sent, bus busy\n", curTick());
  95         return false;
  96     }
  97
  98     DPRINTF(Ethernet, "ethernet packet sent: length=%d\n", pkt->length);
  99     DDUMP(EthernetData, pkt->data, pkt->length);
 100
 101     packet = pkt;
 102     sender = sndr;
 103     int delay = (int)ceil(((double)pkt->simLength * ticksPerByte) + 1.0);
 104     DPRINTF(Ethernet, "scheduling packet: delay=%d, (rate=%f)\n",
 105             delay, ticksPerByte);
 106     schedule(event, curTick() + delay);
 107
 108     return true;
 109 }
 110
 111 EtherBus *
 112 EtherBusParams::create()
 113 {
 114     return new EtherBus(this);
 115 }