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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.
*
* 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.
*
* Authors: Nathan Binkert
*/
/* @file
* Device module for modelling a fixed bandwidth full duplex ethernet link
*/
#ifndef __DEV_ETHERLINK_HH__
#define __DEV_ETHERLINK_HH__
#include <queue>
#include "base/types.hh"
#include "dev/etherint.hh"
#include "dev/etherobject.hh"
#include "dev/etherpkt.hh"
#include "params/EtherLink.hh"
#include "sim/eventq.hh"
#include "sim/sim_object.hh"
class EtherDump;
class Checkpoint;
/*
* Model for a fixed bandwidth full duplex ethernet link
*/
class EtherLink : public EtherObject
{
protected:
class Interface;
/*
* Model for a single uni-directional link
*/
class Link
{
protected:
const std::string objName;
EtherLink *const parent;
const int number;
Interface *txint;
Interface *rxint;
const double ticksPerByte;
const Tick linkDelay;
const Tick delayVar;
EtherDump *const dump;
protected:
/*
* Transfer is complete
*/
EthPacketPtr packet;
void txDone();
typedef EventWrapper<Link, &Link::txDone> DoneEvent;
friend void DoneEvent::process();
DoneEvent doneEvent;
/**
* Maintain a queue of in-flight packets. Assume that the
* delay is non-zero and constant (i.e., at most one packet
* per tick).
*/
std::deque<std::pair<Tick, EthPacketPtr>> txQueue;
void processTxQueue();
typedef EventWrapper<Link, &Link::processTxQueue> TxQueueEvent;
friend void TxQueueEvent::process();
TxQueueEvent txQueueEvent;
void txComplete(EthPacketPtr packet);
public:
Link(const std::string &name, EtherLink *p, int num,
double rate, Tick delay, Tick delay_var, EtherDump *dump);
~Link() {}
const std::string name() const { return objName; }
bool busy() const { return (bool)packet; }
bool transmit(EthPacketPtr packet);
void setTxInt(Interface *i) { assert(!txint); txint = i; }
void setRxInt(Interface *i) { assert(!rxint); rxint = i; }
void serialize(const std::string &base, CheckpointOut &cp) const;
void unserialize(const std::string &base, CheckpointIn &cp);
};
/*
* Interface at each end of the link
*/
class Interface : public EtherInt
{
private:
Link *txlink;
public:
Interface(const std::string &name, Link *txlink, Link *rxlink);
bool recvPacket(EthPacketPtr packet) { return txlink->transmit(packet); }
void sendDone() { peer->sendDone(); }
bool isBusy() { return txlink->busy(); }
};
Link *link[2];
Interface *interface[2];
public:
typedef EtherLinkParams Params;
EtherLink(const Params *p);
virtual ~EtherLink();
const Params *
params() const
{
return dynamic_cast<const Params *>(_params);
}
EtherInt *getEthPort(const std::string &if_name, int idx) override;
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
};
#endif // __ETHERLINK_HH__
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