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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
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*
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* 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
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* 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
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*/
/* @file
* Device module for a full duplex ethernet link for dist gem5 simulations.
*/
#include "dev/net/dist_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/DistEthernet.hh"
#include "debug/DistEthernetPkt.hh"
#include "debug/EthernetData.hh"
#include "dev/net/dist_iface.hh"
#include "dev/net/etherdump.hh"
#include "dev/net/etherint.hh"
#include "dev/net/etherlink.hh"
#include "dev/net/etherpkt.hh"
#include "dev/net/tcp_iface.hh"
#include "params/EtherLink.hh"
#include "sim/core.hh"
#include "sim/serialize.hh"
#include "sim/system.hh"
DistEtherLink::DistEtherLink(const Params &p)
: SimObject(p), linkDelay(p.delay)
{
DPRINTF(DistEthernet,"DistEtherLink::DistEtherLink() "
"link delay:%llu ticksPerByte:%f\n", p.delay, p.speed);
txLink = new TxLink(name() + ".link0", this, p.speed, p.delay_var,
p.dump);
rxLink = new RxLink(name() + ".link1", this, p.delay, p.dump);
Tick sync_repeat;
if (p.sync_repeat != 0) {
if (p.sync_repeat != p.delay)
warn("DistEtherLink(): sync_repeat is %lu and linkdelay is %lu",
p.sync_repeat, p.delay);
sync_repeat = p.sync_repeat;
} else {
sync_repeat = p.delay;
}
// create the dist (TCP) interface to talk to the peer gem5 processes.
distIface = new TCPIface(p.server_name, p.server_port,
p.dist_rank, p.dist_size,
p.sync_start, sync_repeat, this,
p.dist_sync_on_pseudo_op, p.is_switch,
p.num_nodes);
localIface = new LocalIface(name() + ".int0", txLink, rxLink, distIface);
}
DistEtherLink::~DistEtherLink()
{
delete txLink;
delete rxLink;
delete localIface;
delete distIface;
}
Port &
DistEtherLink::getPort(const std::string &if_name, PortID idx)
{
if (if_name == "int0")
return *localIface;
return SimObject::getPort(if_name, idx);
}
void
DistEtherLink::serialize(CheckpointOut &cp) const
{
distIface->serializeSection(cp, "distIface");
txLink->serializeSection(cp, "txLink");
rxLink->serializeSection(cp, "rxLink");
}
void
DistEtherLink::unserialize(CheckpointIn &cp)
{
distIface->unserializeSection(cp, "distIface");
txLink->unserializeSection(cp, "txLink");
rxLink->unserializeSection(cp, "rxLink");
}
void
DistEtherLink::init()
{
DPRINTF(DistEthernet,"DistEtherLink::init() called\n");
distIface->init(rxLink->doneEvent(), linkDelay);
}
void
DistEtherLink::startup()
{
DPRINTF(DistEthernet,"DistEtherLink::startup() called\n");
distIface->startup();
}
void
DistEtherLink::RxLink::setDistInt(DistIface *m)
{
assert(!distIface);
distIface = m;
}
void
DistEtherLink::RxLink::rxDone()
{
assert(!busy());
// retrieve the packet that triggered the receive done event
packet = distIface->packetIn();
if (dump)
dump->dump(packet);
DPRINTF(DistEthernetPkt, "DistEtherLink::DistLink::rxDone() "
"packet received: len=%d\n", packet->length);
DDUMP(EthernetData, packet->data, packet->length);
localIface->sendPacket(packet);
packet = nullptr;
}
void
DistEtherLink::TxLink::txDone()
{
if (dump)
dump->dump(packet);
packet = nullptr;
assert(!busy());
localIface->sendDone();
}
bool
DistEtherLink::TxLink::transmit(EthPacketPtr pkt)
{
if (busy()) {
DPRINTF(DistEthernet, "packet not sent, link busy\n");
return false;
}
packet = pkt;
Tick delay = (Tick)ceil(((double)pkt->simLength * ticksPerByte) + 1.0);
if (delayVar != 0)
delay += random_mt.random<Tick>(0, delayVar);
// send the packet to the peers
assert(distIface);
distIface->packetOut(pkt, delay);
// schedule the send done event
parent->schedule(doneEvent, curTick() + delay);
return true;
}
void
DistEtherLink::Link::serialize(CheckpointOut &cp) const
{
bool packet_exists = (packet != nullptr);
SERIALIZE_SCALAR(packet_exists);
if (packet_exists)
packet->serialize("packet", cp);
bool event_scheduled = event->scheduled();
SERIALIZE_SCALAR(event_scheduled);
if (event_scheduled) {
Tick event_time = event->when();
SERIALIZE_SCALAR(event_time);
}
}
void
DistEtherLink::Link::unserialize(CheckpointIn &cp)
{
bool packet_exists;
UNSERIALIZE_SCALAR(packet_exists);
if (packet_exists) {
packet = std::make_shared<EthPacketData>();
packet->unserialize("packet", cp);
}
bool event_scheduled;
UNSERIALIZE_SCALAR(event_scheduled);
if (event_scheduled) {
Tick event_time;
UNSERIALIZE_SCALAR(event_time);
parent->schedule(*event, event_time);
}
}
DistEtherLink::LocalIface::LocalIface(const std::string &name,
TxLink *tx,
RxLink *rx,
DistIface *m) :
EtherInt(name), txLink(tx)
{
tx->setLocalInt(this);
rx->setLocalInt(this);
tx->setDistInt(m);
rx->setDistInt(m);
}