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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(EthPacketPtr 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;
+ EthPacketPtr packet;
+
+ public:
+ // non-scheduling version for createForUnserialize()
+ LinkDelayEvent();
+ LinkDelayEvent(EtherLink::Link *link, EthPacketPtr 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(EthPacketPtr 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 EthPacketData(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, EthPacketPtr 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 EthPacketData(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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