etherlink.hh

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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
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 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2002-2005 The Regents of The University of Michigan
 * All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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/* @file
 * Device module for modelling a fixed bandwidth full duplex ethernet link
 */
 
#ifndef __DEV_NET_ETHERLINK_HH__
#define __DEV_NET_ETHERLINK_HH__
 
#include <queue>
#include <utility>
 
#include "base/types.hh"
#include "dev/net/etherint.hh"
#include "dev/net/etherpkt.hh"
#include "params/EtherLink.hh"
#include "sim/eventq.hh"
#include "sim/sim_object.hh"
 
namespace gem5
{
 
class EtherDump;
class Checkpoint;
/*
 * Model for a fixed bandwidth full duplex ethernet link
 */
class EtherLink : public SimObject
{
  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();
        EventFunctionWrapper doneEvent;
 
        std::deque<std::pair<Tick, EthPacketPtr>> txQueue;
 
        void processTxQueue();
        EventFunctionWrapper 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:
    using Params = EtherLinkParams;
    EtherLink(const Params &p);
    virtual ~EtherLink();
 
    Port &getPort(const std::string &if_name,
                  PortID idx=InvalidPortID) override;
 
    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;
 
};
 
} // namespace gem5
 
#endif // __DEV_NET_ETHERLINK_HH__