dist_etherlink.hh

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/*
 * Copyright (c) 2015 ARM Limited
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 *
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 * 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
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 * modified or unmodified, in source code or in binary form.
 *
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 * modification, are permitted provided that the following conditions are
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 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * Authors: Gabor Dozsa
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/* @file
 * Device module for a full duplex ethernet link for dist gem5 simulations.
 *
 * See comments in dev/net/dist_iface.hh for a generic description of dist
 * gem5 simulations.
 *
 * This class is meant to be a drop in replacement for the EtherLink class for
 * dist gem5 runs.
 *
 */
#ifndef __DEV_DIST_ETHERLINK_HH__
#define __DEV_DIST_ETHERLINK_HH__

#include <iostream>

#include "dev/net/etherlink.hh"
#include "params/DistEtherLink.hh"

class DistIface;
class EthPacketData;

class DistEtherLink : public SimObject
{
  protected:
    class LocalIface;

    class Link : public Serializable
    {
      protected:
        std::string objName;
        DistEtherLink *parent;
        LocalIface *localIface;
        EtherDump *dump;
        DistIface *distIface;
        Event *event;
        EthPacketPtr packet;

      public:
        Link(const std::string &name, DistEtherLink *p,
             EtherDump *d, Event *e) :
            objName(name), parent(p), localIface(nullptr), dump(d),
            distIface(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(CheckpointOut &cp) const override;
        void unserialize(CheckpointIn &cp) override;
    };

    class TxLink : public Link
    {
      protected:
        double ticksPerByte;
        Tick delayVar;

        void txDone();
        EventFunctionWrapper doneEvent;

      public:
        TxLink(const std::string &name, DistEtherLink *p,
               double invBW, Tick delay_var, EtherDump *d) :
            Link(name, p, d, &doneEvent), ticksPerByte(invBW),
            delayVar(delay_var), doneEvent([this]{ txDone(); }, name) {}
        ~TxLink() {}

        void setDistInt(DistIface *m) { assert(!distIface); distIface=m; }

        bool transmit(EthPacketPtr packet);
    };

    class RxLink : public Link
    {
      protected:

        Tick linkDelay;

        void rxDone();
        EventFunctionWrapper _doneEvent;

      public:

        RxLink(const std::string &name, DistEtherLink *p,
               Tick delay, EtherDump *d) :
            Link(name, p, d, &_doneEvent), linkDelay(delay),
            _doneEvent([this]{ rxDone(); }, name) {}
        ~RxLink() {}

        void setDistInt(DistIface *m);
        const EventFunctionWrapper *doneEvent() const { return &_doneEvent; }
    };

    class LocalIface : public EtherInt
    {
      private:
        TxLink *txLink;

      public:
        LocalIface(const std::string &name, TxLink *tx, RxLink *rx,
                   DistIface *m);

        bool recvPacket(EthPacketPtr pkt) { return txLink->transmit(pkt); }
        void sendDone() { peer->sendDone(); }
        bool isBusy() { return txLink->busy(); }
    };


  protected:
    DistIface *distIface;
    TxLink *txLink;
    RxLink *rxLink;
    LocalIface *localIface;

    Tick linkDelay;

  public:
    typedef DistEtherLinkParams Params;
    DistEtherLink(const Params *p);
    ~DistEtherLink();

    const Params *
    params() const
    {
        return dynamic_cast<const Params *>(_params);
    }

    Port &getPort(const std::string &if_name,
                  PortID idx=InvalidPortID) override;

    virtual void init() override;
    virtual void startup() override;

    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;
};

#endif // __DEV_DIST_ETHERLINK_HH__