42044645b9
Garnet's NetworkInterface does not consider the size of MessageBuffers when ejecting a Message from the network. Add a size check for the MessageBuffer and only enqueue if space is available. If space is not available, the message if placed in a queue and the credit is held. A callback from the MessageBuffer is implemented to wake the NetworkInterface. If there are messages in the stalled queue, they are processed first, in a FIFO manner and if succesfully ejected, the credit is finally sent back upstream. The maximum size of the stall queue is equal to the number of valid VNETs with MessageBuffers attached.
87 lines
2.9 KiB
C++
87 lines
2.9 KiB
C++
/*
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* Copyright (c) 2008 Princeton University
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* Copyright (c) 2016 Georgia Institute of Technology
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Niket Agarwal
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* Tushar Krishna
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*/
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#include "mem/ruby/network/garnet2.0/flit.hh"
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// Constructor for the flit
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flit::flit(int id, int vc, int vnet, RouteInfo route, int size,
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MsgPtr msg_ptr, Cycles curTime)
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{
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m_size = size;
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m_msg_ptr = msg_ptr;
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m_enqueue_time = curTime;
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m_dequeue_time = curTime;
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m_time = curTime;
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m_id = id;
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m_vnet = vnet;
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m_vc = vc;
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m_route = route;
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m_stage.first = I_;
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m_stage.second = m_time;
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if (size == 1) {
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m_type = HEAD_TAIL_;
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return;
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}
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if (id == 0)
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m_type = HEAD_;
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else if (id == (size - 1))
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m_type = TAIL_;
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else
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m_type = BODY_;
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}
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// Flit can be printed out for debugging purposes
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void
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flit::print(std::ostream& out) const
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{
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out << "[flit:: ";
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out << "Id=" << m_id << " ";
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out << "Type=" << m_type << " ";
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out << "Vnet=" << m_vnet << " ";
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out << "VC=" << m_vc << " ";
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out << "Src NI=" << m_route.src_ni << " ";
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out << "Src Router=" << m_route.src_router << " ";
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out << "Dest NI=" << m_route.dest_ni << " ";
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out << "Dest Router=" << m_route.dest_router << " ";
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out << "Enqueue Time=" << m_enqueue_time << " ";
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out << "]";
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}
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bool
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flit::functionalWrite(Packet *pkt)
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{
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Message *msg = m_msg_ptr.get();
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return msg->functionalWrite(pkt);
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}
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