etherbus.cc

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· CC 代码 · 共 112 行

/*
 * Copyright (c) 2002, 2003, 2004, 2005
 * The Regents of The University of Michigan
 * All Rights Reserved
 *
 * This code is part of the M5 simulator.
 *
 * Permission is granted to use, copy, create derivative works and
 * redistribute this software and such derivative works for any
 * purpose, so long as the copyright notice above, this grant of
 * permission, and the disclaimer below appear in all copies made; and
 * so long as the name of The University of Michigan is not used in
 * any advertising or publicity pertaining to the use or distribution
 * of this software without specific, written prior authorization.
 *
 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
 * UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
 * WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
 * LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 *
 * Authors: Nathan L. Binkert
 */

/* @file
 * Device module for modelling an ethernet hub
 */

#include <cmath>
#include <deque>
#include <string>
#include <vector>

#include "base/trace.hh"
#include "dev/etherbus.hh"
#include "dev/etherdump.hh"
#include "dev/etherint.hh"
#include "dev/etherpkt.hh"
#include "params/EtherBus.hh"
#include "sim/core.hh"

using namespace std;

EtherBus::EtherBus(const Params *p)
    : EtherObject(p), ticksPerByte(p->speed), loopback(p->loopback),
      event(&mainEventQueue, this), 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;
}

EtherInt*
EtherBus::getEthPort(const std::string &if_name, int 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->length * ticksPerByte) + 1.0);
    DPRINTF(Ethernet, "scheduling packet: delay=%d, (rate=%f)\n",
            delay, ticksPerByte);
    event.schedule(curTick + delay);

    return true;
}

EtherBus *
EtherBusParams::create()
{
    return new EtherBus(this);
}