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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.
*
* See comments in dev/multi_iface.hh for a generic description of multi
* gem5 simulations.
*
* This class is meant to be a drop in replacement for the EtherLink class for
* multi gem5 runs.
*
*/
#ifndef __DEV_MULTIETHERLINK_HH__
#define __DEV_MULTIETHERLINK_HH__
#include <iostream>
#include "dev/etherlink.hh"
#include "params/MultiEtherLink.hh"
class MultiIface;
class EthPacketData;
/**
* Model for a fixed bandwidth full duplex ethernet link.
*/
class MultiEtherLink : public EtherObject
{
protected:
class LocalIface;
/**
* Model base class for a single uni-directional link.
*
* The link will encapsulate and transfer Ethernet packets to/from
* the message server.
*/
class Link
{
protected:
std::string objName;
MultiEtherLink *parent;
LocalIface *localIface;
EtherDump *dump;
MultiIface *multiIface;
Event *event;
EthPacketPtr packet;
public:
Link(const std::string &name, MultiEtherLink *p,
EtherDump *d, Event *e) :
objName(name), parent(p), localIface(nullptr), dump(d),
multiIface(nullptr), event(e) {}
~Link() {}
const std::string name() const { return objName; }
bool busy() const { return (bool)packet; }
void setLocalInt(LocalIface *i) { assert(!localIface); localIface=i; }
void serialize(const std::string &base, CheckpointOut &cp) const;
void unserialize(const std::string &base, CheckpointIn &cp);
};
/**
* Model for a send link.
*/
class TxLink : public Link
{
protected:
/**
* Per byte send delay
*/
double ticksPerByte;
/**
* Random component of the send delay
*/
Tick delayVar;
/**
* Send done callback. Called from doneEvent.
*/
void txDone();
typedef EventWrapper<TxLink, &TxLink::txDone> DoneEvent;
friend void DoneEvent::process();
DoneEvent doneEvent;
public:
TxLink(const std::string &name, MultiEtherLink *p,
double invBW, Tick delay_var, EtherDump *d) :
Link(name, p, d, &doneEvent), ticksPerByte(invBW),
delayVar(delay_var), doneEvent(this) {}
~TxLink() {}
/**
* Register the multi interface to be used to talk to the
* peer gem5 processes.
*/
void setMultiInt(MultiIface *m) { assert(!multiIface); multiIface=m; }
/**
* Initiate sending of a packet via this link.
*
* @param packet Ethernet packet to send
*/
bool transmit(EthPacketPtr packet);
};
/**
* Model for a receive link.
*/
class RxLink : public Link
{
protected:
/**
* Transmission delay for the simulated Ethernet link.
*/
Tick linkDelay;
/**
* Receive done callback method. Called from doneEvent.
*/
void rxDone() ;
typedef EventWrapper<RxLink, &RxLink::rxDone> DoneEvent;
friend void DoneEvent::process();
DoneEvent doneEvent;
public:
RxLink(const std::string &name, MultiEtherLink *p,
Tick delay, EtherDump *d) :
Link(name, p, d, &doneEvent),
linkDelay(delay), doneEvent(this) {}
~RxLink() {}
/**
* Register our multi interface to talk to the peer gem5 processes.
*/
void setMultiInt(MultiIface *m);
};
/**
* Interface to the local simulated system
*/
class LocalIface : public EtherInt
{
private:
TxLink *txLink;
public:
LocalIface(const std::string &name, TxLink *tx, RxLink *rx,
MultiIface *m);
bool recvPacket(EthPacketPtr pkt) { return txLink->transmit(pkt); }
void sendDone() { peer->sendDone(); }
bool isBusy() { return txLink->busy(); }
};
protected:
/**
* Interface to talk to the peer gem5 processes.
*/
MultiIface *multiIface;
/**
* Send link
*/
TxLink *txLink;
/**
* Receive link
*/
RxLink *rxLink;
LocalIface *localIface;
public:
typedef MultiEtherLinkParams Params;
MultiEtherLink(const Params *p);
~MultiEtherLink();
const Params *
params() const
{
return dynamic_cast<const Params *>(_params);
}
virtual EtherInt *getEthPort(const std::string &if_name,
int idx) override;
void memWriteback() override;
void init() override;
void startup() override;
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
};
#endif // __DEV_MULTIETHERLINK_HH__
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