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Diffstat (limited to 'src/dev/net/etherlink.hh')
| -rw-r--r-- | src/dev/net/etherlink.hh | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/src/dev/net/etherlink.hh b/src/dev/net/etherlink.hh new file mode 100644 index 000000000..1d02dec3b --- /dev/null +++ b/src/dev/net/etherlink.hh @@ -0,0 +1,166 @@ +/* + * 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_NET_ETHERLINK_HH__ +#define __DEV_NET_ETHERLINK_HH__ + +#include <queue> + +#include "base/types.hh" +#include "dev/net/etherint.hh" +#include "dev/net/etherobject.hh" +#include "dev/net/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 // __DEV_NET_ETHERLINK_HH__ |