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/*
* Copyright (c) 2003 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
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* @file
* Device module for modelling a fixed bandwidth full duplex ethernet link
*/
#include <cmath>
#include <deque>
#include <string>
#include <vector>
#include "base/trace.hh"
#include "dev/etherdump.hh"
#include "dev/etherint.hh"
#include "dev/etherlink.hh"
#include "dev/etherpkt.hh"
#include "sim/builder.hh"
#include "sim/universe.hh"
using namespace std;
EtherLink::EtherLink(const std::string &name, EtherInt *i1, EtherInt *i2,
Tick speed, EtherDump *dump)
: SimObject(name)
{
double rate = ((double)ticksPerSecond * 8.0) / (double)speed;
link1 = new Link(name + ".link1", rate, dump);
link2 = new Link(name + ".link2", rate, dump);
int1 = new Interface(name + ".int1", link1, link2);
int2 = new Interface(name + ".int2", link2, link1);
int1->setPeer(i1);
i1->setPeer(int1);
int2->setPeer(i2);
i2->setPeer(int2);
}
EtherLink::~EtherLink()
{
delete link1;
delete link2;
delete int1;
delete int2;
}
EtherLink::Interface::Interface(const std::string &name, Link *tx, Link *rx)
: EtherInt(name), txlink(tx)
{
tx->setTxInt(this);
rx->setRxInt(this);
}
EtherLink::Link::Link(const std::string &name, double rate, EtherDump *d)
: objName(name), txint(NULL), rxint(NULL), ticks_per_byte(rate),
dump(d), event(&mainEventQueue, this)
{}
void
EtherLink::Link::txDone()
{
if (dump)
dump->dump(packet);
DPRINTF(Ethernet, "EtherLink packet received: len=%d\n", packet->length);
DDUMP(EthernetData, packet->data, packet->length);
rxint->sendPacket(packet);
packet = 0;
assert(!busy());
txint->sendDone();
}
bool
EtherLink::Link::transmit(PacketPtr pkt)
{
if (busy()) {
DPRINTF(Ethernet, "EtherLink packet not sent, link busy\n");
return false;
}
DPRINTF(Ethernet, "EtherLink packet sent: len=%d\n", pkt->length);
DDUMP(EthernetData, pkt->data, pkt->length);
packet = pkt;
int delay = (int)ceil(((double)pkt->length * ticks_per_byte) + 1.0);
DPRINTF(Ethernet, "EtherLink scheduling packet: delay=%d, (rate=%f)\n",
delay, ticks_per_byte);
event.schedule(curTick + delay);
return true;
}
BEGIN_DECLARE_SIM_OBJECT_PARAMS(EtherLink)
SimObjectParam<EtherInt *> interface1;
SimObjectParam<EtherInt *> interface2;
Param<Tick> link_speed;
SimObjectParam<EtherDump *> packet_dump;
END_DECLARE_SIM_OBJECT_PARAMS(EtherLink)
BEGIN_INIT_SIM_OBJECT_PARAMS(EtherLink)
INIT_PARAM(interface1, "interface 1"),
INIT_PARAM(interface2, "interface 2"),
INIT_PARAM_DFLT(link_speed, "link speed in bits per second", 100000000),
INIT_PARAM_DFLT(packet_dump, "object to dump network packets to", NULL)
END_INIT_SIM_OBJECT_PARAMS(EtherLink)
CREATE_SIM_OBJECT(EtherLink)
{
return new EtherLink(getInstanceName(), interface1, interface2, link_speed,
packet_dump);
}
REGISTER_SIM_OBJECT("EtherLink", EtherLink)
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