etherbus.cc revision 2566
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 29/* @file 30 * Device module for modelling an ethernet hub 31 */ 32 33#include <cmath> 34#include <deque> 35#include <string> 36#include <vector> 37 38#include "base/trace.hh" 39#include "dev/etherbus.hh" 40#include "dev/etherdump.hh" 41#include "dev/etherint.hh" 42#include "dev/etherpkt.hh" 43#include "sim/builder.hh" 44#include "sim/root.hh" 45 46using namespace std; 47 48EtherBus::EtherBus(const string &name, double speed, bool loop, 49 EtherDump *packet_dump) 50 : SimObject(name), ticksPerByte(speed), loopback(loop), 51 event(&mainEventQueue, this), sender(0), dump(packet_dump) 52{ 53} 54 55void 56EtherBus::txDone() 57{ 58 devlist_t::iterator i = devlist.begin(); 59 devlist_t::iterator end = devlist.end(); 60 61 DPRINTF(Ethernet, "ethernet packet received: length=%d\n", packet->length); 62 DDUMP(EthernetData, packet->data, packet->length); 63 64 while (i != end) { 65 if (loopback || *i != sender) 66 (*i)->sendPacket(packet); 67 ++i; 68 } 69 70 sender->sendDone(); 71 72 if (dump) 73 dump->dump(packet); 74 75 sender = 0; 76 packet = 0; 77} 78 79void 80EtherBus::reg(EtherInt *dev) 81{ devlist.push_back(dev); } 82 83bool 84EtherBus::send(EtherInt *sndr, EthPacketPtr &pkt) 85{ 86 if (busy()) { 87 DPRINTF(Ethernet, "ethernet packet not sent, bus busy\n", curTick); 88 return false; 89 } 90 91 DPRINTF(Ethernet, "ethernet packet sent: length=%d\n", pkt->length); 92 DDUMP(EthernetData, pkt->data, pkt->length); 93 94 packet = pkt; 95 sender = sndr; 96 int delay = (int)ceil(((double)pkt->length * ticksPerByte) + 1.0); 97 DPRINTF(Ethernet, "scheduling packet: delay=%d, (rate=%f)\n", 98 delay, ticksPerByte); 99 event.schedule(curTick + delay); 100 101 return true; 102} 103 104BEGIN_DECLARE_SIM_OBJECT_PARAMS(EtherBus) 105 106 Param<bool> loopback; 107 Param<double> speed; 108 SimObjectParam<EtherDump *> packet_dump; 109 110END_DECLARE_SIM_OBJECT_PARAMS(EtherBus) 111 112BEGIN_INIT_SIM_OBJECT_PARAMS(EtherBus) 113 114 INIT_PARAM(loopback, "send the packet back to the sending interface"), 115 INIT_PARAM(speed, "bus speed in ticks per byte"), 116 INIT_PARAM(packet_dump, "object to dump network packets to") 117 118END_INIT_SIM_OBJECT_PARAMS(EtherBus) 119 120CREATE_SIM_OBJECT(EtherBus) 121{ 122 return new EtherBus(getInstanceName(), speed, loopback, packet_dump); 123} 124 125REGISTER_SIM_OBJECT("EtherBus", EtherBus) 126