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/*
* Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
* 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.
*/
/*
* Router.h
*
* Niket Agarwal, Princeton University
*
* */
#ifndef ROUTER_H
#define ROUTER_H
#include "NetworkHeader.hh"
#include "GarnetNetwork.hh"
#include "FlexibleConsumer.hh"
#include "PrioHeap.hh"
#include "NetworkLink.hh"
#include "NetDest.hh"
#include "flitBuffer.hh"
#include "InVcState.hh"
#include "OutVcState.hh"
class VCarbiter;
class Router : public FlexibleConsumer {
public:
Router(int id, GarnetNetwork *network_ptr);
~Router();
void addInPort(NetworkLink *in_link);
void addOutPort(NetworkLink *out_link, const NetDest& routing_table_entry, int link_weight);
void wakeup();
void request_vc(int in_vc, int in_port, NetDest destination, Time request_time);
bool isBufferNotFull(int vc, int inport);
void grant_vc(int out_port, int vc, Time grant_time);
void release_vc(int out_port, int vc, Time release_time);
void vc_arbitrate();
void printConfig(ostream& out) const;
void print(ostream& out) const;
private:
/***************Data Members******************/
int m_id;
int m_virtual_networks, m_num_vcs, m_vc_per_vnet;
GarnetNetwork *m_net_ptr;
Vector<int > m_vc_round_robin; // For scheduling of out source queues
int m_round_robin_inport, m_round_robin_start; // for vc arbitration
Vector<int > m_round_robin_invc; // For every outport. for vc arbitration
Vector<Vector<flitBuffer *> > m_router_buffers; // These are essentially output buffers
Vector<flitBuffer *> m_out_src_queue; // These are source queues for the output link
Vector<NetworkLink *> m_in_link;
Vector<NetworkLink *> m_out_link;
Vector<Vector<InVcState * > > m_in_vc_state;
Vector<Vector<OutVcState * > > m_out_vc_state;
Vector<NetDest> m_routing_table;
Vector<int > m_link_weights;
VCarbiter *m_vc_arbiter;
/*********** Private methods *************/
int getRoute(NetDest destination);
Vector<int > get_valid_vcs(int invc);
void routeCompute(flit *m_flit, int inport);
void checkReschedule();
void check_arbiter_reschedule();
void scheduleOutputLinks();
};
#endif
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