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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.
*/
/*
* Routingunit_d.C
*
* Niket Agarwal, Princeton University
*
* */
#include "mem/ruby/network/garnet-fixed-pipeline/RoutingUnit_d.hh"
#include "mem/ruby/network/garnet-fixed-pipeline/Router_d.hh"
#include "mem/ruby/network/garnet-fixed-pipeline/InputUnit_d.hh"
#include "mem/ruby/slicc_interface/NetworkMessage.hh"
RoutingUnit_d::RoutingUnit_d(Router_d *router)
{
m_router = router;
m_routing_table.clear();
m_weight_table.clear();
}
void RoutingUnit_d::addRoute(const NetDest& routing_table_entry)
{
m_routing_table.insertAtBottom(routing_table_entry);
}
void RoutingUnit_d::addWeight(int link_weight)
{
m_weight_table.insertAtBottom(link_weight);
}
void RoutingUnit_d::RC_stage(flit_d *t_flit, InputUnit_d *in_unit, int invc)
{
int outport = routeCompute(t_flit);
in_unit->updateRoute(invc, outport);
t_flit->advance_stage(VA_);
m_router->vcarb_req();
}
int RoutingUnit_d::routeCompute(flit_d *t_flit)
{
MsgPtr msg_ptr = t_flit->get_msg_ptr();
NetworkMessage* net_msg_ptr = NULL;
net_msg_ptr = dynamic_cast<NetworkMessage*>(msg_ptr.ref());
NetDest msg_destination = net_msg_ptr->getInternalDestination();
int output_link = -1;
int min_weight = INFINITE_;
for(int link = 0; link < m_routing_table.size(); link++)
{
if (msg_destination.intersectionIsNotEmpty(m_routing_table[link]))
{
if(m_weight_table[link] >= min_weight)
continue;
output_link = link;
min_weight = m_weight_table[link];
}
}
if(output_link == -1)
{
ERROR_MSG("Fatal Error:: No Route exists from this Router.");
exit(0);
}
return output_link;
}
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