etherbus.cc revision 4762
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 48using namespace std; 49 50EtherBus::EtherBus(const string &name, double speed, bool loop, 51 EtherDump *packet_dump) 52 : SimObject(name), ticksPerByte(speed), loopback(loop), 53 event(&mainEventQueue, this), sender(0), dump(packet_dump) 54{ 55} 56 57void 58EtherBus::txDone() 59{ 60 devlist_t::iterator i = devlist.begin(); 61 devlist_t::iterator end = devlist.end(); 62 63 DPRINTF(Ethernet, "ethernet packet received: length=%d\n", packet->length); 64 DDUMP(EthernetData, packet->data, packet->length); 65 66 while (i != end) { 67 if (loopback || *i != sender) 68 (*i)->sendPacket(packet); 69 ++i; 70 } 71 72 sender->sendDone(); 73 74 if (dump) 75 dump->dump(packet); 76 77 sender = 0; 78 packet = 0; 79} 80 81void 82EtherBus::reg(EtherInt *dev) 83{ devlist.push_back(dev); } 84 85bool 86EtherBus::send(EtherInt *sndr, EthPacketPtr &pkt) 87{ 88 if (busy()) { 89 DPRINTF(Ethernet, "ethernet packet not sent, bus busy\n", curTick); 90 return false; 91 } 92 93 DPRINTF(Ethernet, "ethernet packet sent: length=%d\n", pkt->length); 94 DDUMP(EthernetData, pkt->data, pkt->length); 95 96 packet = pkt; 97 sender = sndr; 98 int delay = (int)ceil(((double)pkt->length * ticksPerByte) + 1.0); 99 DPRINTF(Ethernet, "scheduling packet: delay=%d, (rate=%f)\n", 100 delay, ticksPerByte); 101 event.schedule(curTick + delay); 102 103 return true; 104} 105 106EtherBus * 107EtherBusParams::create() 108{ 109 return new EtherBus(name, speed, loopback, dump); 110} 111