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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.
*
* Authors: Nathan Binkert
*/
/* @file
* Device module for modelling a fixed bandwidth full duplex ethernet link
*/
#ifndef __DEV_ETHERLINK_HH__
#define __DEV_ETHERLINK_HH__
#include "dev/etherobject.hh"
#include "dev/etherint.hh"
#include "dev/etherpkt.hh"
#include "params/EtherLink.hh"
#include "sim/eventq.hh"
#include "sim/host.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;
friend class LinkDelayEvent;
/*
* Model for a single uni-directional link
*/
class Link
{
protected:
std::string objName;
EtherLink *parent;
int number;
Interface *txint;
Interface *rxint;
double ticksPerByte;
Tick linkDelay;
Tick delayVar;
EtherDump *dump;
protected:
/*
* Transfer is complete
*/
EthPacketPtr packet;
void txDone();
typedef EventWrapper<Link, &Link::txDone> DoneEvent;
friend void DoneEvent::process();
DoneEvent doneEvent;
friend class LinkDelayEvent;
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, std::ostream &os);
void unserialize(const std::string &base, Checkpoint *cp,
const std::string §ion);
};
/*
* 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);
}
virtual EtherInt *getEthPort(const std::string &if_name, int idx);
virtual void serialize(std::ostream &os);
virtual void unserialize(Checkpoint *cp, const std::string §ion);
};
#endif // __ETHERLINK_HH__
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