etherbus.cc revision 4981
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 Params *p) 51 : EtherObject(p), ticksPerByte(p->speed), loopback(p->loopback), 52 event(&mainEventQueue, this), sender(0), dump(p->dump) 53{ 54} 55 56void 57EtherBus::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 80EtherInt* 81EtherBus::getEthPort(const std::string &if_name, int idx) 82{ 83 panic("Etherbus doesn't work\n"); 84} 85 86bool 87EtherBus::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 107EtherBus * 108EtherBusParams::create() 109{ 110 return new EtherBus(this); 111} 112