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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
- * 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/random.hh"
-#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/serialize.hh"
-#include "sim/system.hh"
-#include "sim/root.hh"
-
-using namespace std;
-
-EtherLink::EtherLink(const string &name, EtherInt *peer0, EtherInt *peer1,
- double rate, Tick delay, Tick delayVar, EtherDump *dump)
- : SimObject(name)
-{
- link[0] = new Link(name + ".link0", this, 0, rate, delay, delayVar, dump);
- link[1] = new Link(name + ".link1", this, 1, rate, delay, delayVar, dump);
-
- interface[0] = new Interface(name + ".int0", link[0], link[1]);
- interface[1] = new Interface(name + ".int1", link[1], link[0]);
-
- interface[0]->setPeer(peer0);
- peer0->setPeer(interface[0]);
- interface[1]->setPeer(peer1);
- peer1->setPeer(interface[1]);
-}
-
-EtherLink::~EtherLink()
-{
- delete link[0];
- delete link[1];
-
- delete interface[0];
- delete interface[1];
-}
-
-EtherLink::Interface::Interface(const string &name, Link *tx, Link *rx)
- : EtherInt(name), txlink(tx)
-{
- tx->setTxInt(this);
- rx->setRxInt(this);
-}
-
-EtherLink::Link::Link(const string &name, EtherLink *p, int num,
- double rate, Tick delay, Tick delay_var, EtherDump *d)
- : objName(name), parent(p), number(num), txint(NULL), rxint(NULL),
- ticksPerByte(rate), linkDelay(delay), delayVar(delay_var), dump(d),
- doneEvent(this)
-{ }
-
-void
-EtherLink::serialize(ostream &os)
-{
- link[0]->serialize("link0", os);
- link[1]->serialize("link1", os);
-}
-
-void
-EtherLink::unserialize(Checkpoint *cp, const string &section)
-{
- link[0]->unserialize("link0", cp, section);
- link[1]->unserialize("link1", cp, section);
-}
-
-void
-EtherLink::Link::txComplete(PacketPtr packet)
-{
- DPRINTF(Ethernet, "packet received: len=%d\n", packet->length);
- DDUMP(EthernetData, packet->data, packet->length);
- rxint->sendPacket(packet);
-}
-
-class LinkDelayEvent : public Event
-{
- protected:
- EtherLink::Link *link;
- PacketPtr packet;
-
- public:
- // non-scheduling version for createForUnserialize()
- LinkDelayEvent();
- LinkDelayEvent(EtherLink::Link *link, PacketPtr pkt, Tick when);
-
- void process();
-
- virtual void serialize(ostream &os);
- virtual void unserialize(Checkpoint *cp, const string &section);
- static Serializable *createForUnserialize(Checkpoint *cp,
- const string &section);
-};
-
-void
-EtherLink::Link::txDone()
-{
- if (dump)
- dump->dump(packet);
-
- if (linkDelay > 0) {
- DPRINTF(Ethernet, "packet delayed: delay=%d\n", linkDelay);
- new LinkDelayEvent(this, packet, curTick + linkDelay);
- } else {
- txComplete(packet);
- }
-
- packet = 0;
- assert(!busy());
-
- txint->sendDone();
-}
-
-bool
-EtherLink::Link::transmit(PacketPtr pkt)
-{
- if (busy()) {
- DPRINTF(Ethernet, "packet not sent, link busy\n");
- return false;
- }
-
- DPRINTF(Ethernet, "packet sent: len=%d\n", pkt->length);
- DDUMP(EthernetData, pkt->data, pkt->length);
-
- packet = pkt;
- Tick delay = (Tick)ceil(((double)pkt->length * ticksPerByte) + 1.0);
- if (delayVar != 0) {
- Random<Tick> var;
- delay += var.uniform(0, delayVar);
- }
- DPRINTF(Ethernet, "scheduling packet: delay=%d, (rate=%f)\n",
- delay, ticksPerByte);
- doneEvent.schedule(curTick + delay);
-
- return true;
-}
-
-void
-EtherLink::Link::serialize(const string &base, ostream &os)
-{
- bool packet_exists = packet;
- paramOut(os, base + ".packet_exists", packet_exists);
- if (packet_exists)
- packet->serialize(base + ".packet", os);
-
- bool event_scheduled = doneEvent.scheduled();
- paramOut(os, base + ".event_scheduled", event_scheduled);
- if (event_scheduled) {
- Tick event_time = doneEvent.when();
- paramOut(os, base + ".event_time", event_time);
- }
-
-}
-
-void
-EtherLink::Link::unserialize(const string &base, Checkpoint *cp,
- const string &section)
-{
- bool packet_exists;
- paramIn(cp, section, base + ".packet_exists", packet_exists);
- if (packet_exists) {
- packet = new PacketData(16384);
- packet->unserialize(base + ".packet", cp, section);
- }
-
- bool event_scheduled;
- paramIn(cp, section, base + ".event_scheduled", event_scheduled);
- if (event_scheduled) {
- Tick event_time;
- paramIn(cp, section, base + ".event_time", event_time);
- doneEvent.schedule(event_time);
- }
-}
-
-LinkDelayEvent::LinkDelayEvent()
- : Event(&mainEventQueue), link(NULL)
-{
- setFlags(AutoSerialize);
- setFlags(AutoDelete);
-}
-
-LinkDelayEvent::LinkDelayEvent(EtherLink::Link *l, PacketPtr p, Tick when)
- : Event(&mainEventQueue), link(l), packet(p)
-{
- setFlags(AutoSerialize);
- setFlags(AutoDelete);
- schedule(when);
-}
-
-void
-LinkDelayEvent::process()
-{
- link->txComplete(packet);
-}
-
-void
-LinkDelayEvent::serialize(ostream &os)
-{
- paramOut(os, "type", string("LinkDelayEvent"));
- Event::serialize(os);
-
- EtherLink *parent = link->parent;
- bool number = link->number;
- SERIALIZE_OBJPTR(parent);
- SERIALIZE_SCALAR(number);
-
- packet->serialize("packet", os);
-}
-
-
-void
-LinkDelayEvent::unserialize(Checkpoint *cp, const string &section)
-{
- Event::unserialize(cp, section);
-
- EtherLink *parent;
- bool number;
- UNSERIALIZE_OBJPTR(parent);
- UNSERIALIZE_SCALAR(number);
-
- link = parent->link[number];
-
- packet = new PacketData(16384);
- packet->unserialize("packet", cp, section);
-}
-
-
-Serializable *
-LinkDelayEvent::createForUnserialize(Checkpoint *cp, const string &section)
-{
- return new LinkDelayEvent();
-}
-
-REGISTER_SERIALIZEABLE("LinkDelayEvent", LinkDelayEvent)
-
-BEGIN_DECLARE_SIM_OBJECT_PARAMS(EtherLink)
-
- SimObjectParam<EtherInt *> int1;
- SimObjectParam<EtherInt *> int2;
- Param<double> speed;
- Param<Tick> delay;
- Param<Tick> delay_var;
- SimObjectParam<EtherDump *> dump;
-
-END_DECLARE_SIM_OBJECT_PARAMS(EtherLink)
-
-BEGIN_INIT_SIM_OBJECT_PARAMS(EtherLink)
-
- INIT_PARAM(int1, "interface 1"),
- INIT_PARAM(int2, "interface 2"),
- INIT_PARAM(speed, "link speed in bits per second"),
- INIT_PARAM(delay, "transmit delay of packets in us"),
- INIT_PARAM(delay_var, "Difference in amount of time to traverse wire"),
- INIT_PARAM(dump, "object to dump network packets to")
-
-END_INIT_SIM_OBJECT_PARAMS(EtherLink)
-
-CREATE_SIM_OBJECT(EtherLink)
-{
- return new EtherLink(getInstanceName(), int1, int2, speed, delay, delay_var,
- dump);
-}
-
-REGISTER_SIM_OBJECT("EtherLink", EtherLink)
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