etherbus.cc

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/*
 * Copyright (c) 2002-2005 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/* @file
 * Device module for modelling an ethernet hub
 */
#include "dev/net/etherbus.hh"
 
#include <cmath>
#include <deque>
#include <string>
#include <vector>
 
#include "base/logging.hh"
#include "base/trace.hh"
#include "debug/Ethernet.hh"
#include "debug/EthernetData.hh"
#include "dev/net/etherdump.hh"
#include "dev/net/etherint.hh"
#include "dev/net/etherpkt.hh"
#include "params/EtherBus.hh"
#include "sim/cur_tick.hh"
 
namespace gem5
{
 
EtherBus::EtherBus(const Params &p)
    : SimObject(p), ticksPerByte(p.speed), loopback(p.loopback),
      event([this]{ txDone(); }, "ethernet bus completion"),
      sender(0), dump(p.dump)
{
}
 
void
EtherBus::txDone()
{
    devlist_t::iterator i = devlist.begin();
    devlist_t::iterator end = devlist.end();
 
    DPRINTF(Ethernet, "ethernet packet received: length=%d\n", packet->length);
    DDUMP(EthernetData, packet->data, packet->length);
 
    while (i != end) {
        if (loopback || *i != sender)
            (*i)->sendPacket(packet);
        ++i;
    }
 
    sender->sendDone();
 
    if (dump)
        dump->dump(packet);
 
    sender = 0;
    packet = 0;
}
 
Port &
EtherBus::getPort(const std::string &if_name, PortID idx)
{
    panic("Etherbus doesn't work\n");
}
 
bool
EtherBus::send(EtherInt *sndr, EthPacketPtr &pkt)
{
    if (busy()) {
        DPRINTF(Ethernet, "ethernet packet not sent, bus busy\n", curTick());
        return false;
    }
 
    DPRINTF(Ethernet, "ethernet packet sent: length=%d\n", pkt->length);
    DDUMP(EthernetData, pkt->data, pkt->length);
 
    packet = pkt;
    sender = sndr;
    int delay = (int)ceil(((double)pkt->simLength * ticksPerByte) + 1.0);
    DPRINTF(Ethernet, "scheduling packet: delay=%d, (rate=%f)\n",
            delay, ticksPerByte);
    schedule(event, curTick() + delay);
 
    return true;
}
 
} // namespace gem5