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+/*
+ * Copyright (c) 2015 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder. You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
+ * 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.
+ *
+ * Authors: Gabor Dozsa
+ */
+
+/* @file
+ * Device module for a full duplex ethernet link for multi gem5 simulations.
+ */
+
+#include "dev/multi_etherlink.hh"
+
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include <cmath>
+#include <deque>
+#include <string>
+#include <vector>
+
+#include "base/random.hh"
+#include "base/trace.hh"
+#include "debug/EthernetData.hh"
+#include "debug/MultiEthernet.hh"
+#include "debug/MultiEthernetPkt.hh"
+#include "dev/etherdump.hh"
+#include "dev/etherint.hh"
+#include "dev/etherlink.hh"
+#include "dev/etherobject.hh"
+#include "dev/etherpkt.hh"
+#include "dev/multi_iface.hh"
+#include "dev/tcp_iface.hh"
+#include "params/EtherLink.hh"
+#include "sim/core.hh"
+#include "sim/serialize.hh"
+#include "sim/system.hh"
+
+using namespace std;
+
+MultiEtherLink::MultiEtherLink(const Params *p)
+ : EtherObject(p)
+{
+ DPRINTF(MultiEthernet,"MultiEtherLink::MultiEtherLink() "
+ "link delay:%llu\n", p->delay);
+
+ txLink = new TxLink(name() + ".link0", this, p->speed, p->delay_var,
+ p->dump);
+ rxLink = new RxLink(name() + ".link1", this, p->delay, p->dump);
+
+ // create the multi (TCP) interface to talk to the peer gem5 processes.
+ multiIface = new TCPIface(p->server_name, p->server_port, p->multi_rank,
+ p->sync_start, p->sync_repeat, this);
+
+ localIface = new LocalIface(name() + ".int0", txLink, rxLink, multiIface);
+}
+
+MultiEtherLink::~MultiEtherLink()
+{
+ delete txLink;
+ delete rxLink;
+ delete localIface;
+ delete multiIface;
+}
+
+EtherInt*
+MultiEtherLink::getEthPort(const std::string &if_name, int idx)
+{
+ if (if_name != "int0") {
+ return nullptr;
+ } else {
+ panic_if(localIface->getPeer(), "interface already connected to");
+ }
+ return localIface;
+}
+
+void MultiEtherLink::memWriteback()
+{
+ DPRINTF(MultiEthernet,"MultiEtherLink::memWriteback() called\n");
+ multiIface->drainDone();
+}
+
+void
+MultiEtherLink::serialize(CheckpointOut &cp) const
+{
+ multiIface->serialize("multiIface", cp);
+ txLink->serialize("txLink", cp);
+ rxLink->serialize("rxLink", cp);
+}
+
+void
+MultiEtherLink::unserialize(CheckpointIn &cp)
+{
+ multiIface->unserialize("multiIface", cp);
+ txLink->unserialize("txLink", cp);
+ rxLink->unserialize("rxLink", cp);
+}
+
+void
+MultiEtherLink::init()
+{
+ DPRINTF(MultiEthernet,"MultiEtherLink::init() called\n");
+ multiIface->initRandom();
+}
+
+void
+MultiEtherLink::startup()
+{
+ DPRINTF(MultiEthernet,"MultiEtherLink::startup() called\n");
+ multiIface->startPeriodicSync();
+}
+
+void
+MultiEtherLink::RxLink::setMultiInt(MultiIface *m)
+{
+ assert(!multiIface);
+ multiIface = m;
+ // Spawn a new receiver thread that will process messages
+ // coming in from peer gem5 processes.
+ // The receive thread will also schedule a (receive) doneEvent
+ // for each incoming data packet.
+ multiIface->spawnRecvThread(&doneEvent, linkDelay);
+}
+
+void
+MultiEtherLink::RxLink::rxDone()
+{
+ assert(!busy());
+
+ // retrieve the packet that triggered the receive done event
+ packet = multiIface->packetIn();
+
+ if (dump)
+ dump->dump(packet);
+
+ DPRINTF(MultiEthernetPkt, "MultiEtherLink::MultiLink::rxDone() "
+ "packet received: len=%d\n", packet->length);
+ DDUMP(EthernetData, packet->data, packet->length);
+
+ localIface->sendPacket(packet);
+
+ packet = nullptr;
+}
+
+void
+MultiEtherLink::TxLink::txDone()
+{
+ if (dump)
+ dump->dump(packet);
+
+ packet = nullptr;
+ assert(!busy());
+
+ localIface->sendDone();
+}
+
+bool
+MultiEtherLink::TxLink::transmit(EthPacketPtr pkt)
+{
+ if (busy()) {
+ DPRINTF(MultiEthernet, "packet not sent, link busy\n");
+ return false;
+ }
+
+ packet = pkt;
+ Tick delay = (Tick)ceil(((double)pkt->length * ticksPerByte) + 1.0);
+ if (delayVar != 0)
+ delay += random_mt.random<Tick>(0, delayVar);
+
+ // send the packet to the peers
+ assert(multiIface);
+ multiIface->packetOut(pkt, delay);
+
+ // schedule the send done event
+ parent->schedule(doneEvent, curTick() + delay);
+
+ return true;
+}
+
+void
+MultiEtherLink::Link::serialize(const string &base, CheckpointOut &cp) const
+{
+ bool packet_exists = (packet != nullptr);
+ paramOut(cp, base + ".packet_exists", packet_exists);
+ if (packet_exists)
+ packet->serialize(base + ".packet", cp);
+
+ bool event_scheduled = event->scheduled();
+ paramOut(cp, base + ".event_scheduled", event_scheduled);
+ if (event_scheduled) {
+ Tick event_time = event->when();
+ paramOut(cp, base + ".event_time", event_time);
+ }
+}
+
+void
+MultiEtherLink::Link::unserialize(const string &base, CheckpointIn &cp)
+{
+ bool packet_exists;
+ paramIn(cp, base + ".packet_exists", packet_exists);
+ if (packet_exists) {
+ packet = make_shared<EthPacketData>(16384);
+ packet->unserialize(base + ".packet", cp);
+ }
+
+ bool event_scheduled;
+ paramIn(cp, base + ".event_scheduled", event_scheduled);
+ if (event_scheduled) {
+ Tick event_time;
+ paramIn(cp, base + ".event_time", event_time);
+ parent->schedule(*event, event_time);
+ }
+}
+
+MultiEtherLink::LocalIface::LocalIface(const std::string &name,
+ TxLink *tx,
+ RxLink *rx,
+ MultiIface *m) :
+ EtherInt(name), txLink(tx)
+{
+ tx->setLocalInt(this);
+ rx->setLocalInt(this);
+ tx->setMultiInt(m);
+ rx->setMultiInt(m);
+}
+
+MultiEtherLink *
+MultiEtherLinkParams::create()
+{
+ return new MultiEtherLink(this);
+}
+
+
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