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acastong |
//LogicalLayer.cpp
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is HyperTransport Tunnel IP Core.
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*
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* The Initial Developer of the Original Code is
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* Ecole Polytechnique de Montreal.
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Ami Castonguay <acastong@grm.polymtl.ca>
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*
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* Alternatively, the contents of this file may be used under the terms
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* of the Polytechnique HyperTransport Tunnel IP Core Source Code License
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* (the "PHTICSCL License", see the file PHTICSCL.txt), in which case the
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* provisions of PHTICSCL License are applicable instead of those
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* above. If you wish to allow use of your version of this file only
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* under the terms of the PHTICSCL License and not to allow others to use
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* your version of this file under the MPL, indicate your decision by
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* deleting the provisions above and replace them with the notice and
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* other provisions required by the PHTICSCL License. If you do not delete
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* the provisions above, a recipient may use your version of this file
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* under either the MPL or the PHTICSCL License."
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*
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* ***** END LICENSE BLOCK ***** */
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#include "../core/PacketContainer.h"
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#include "../core/InfoPacket.h"
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#include "../core/RequestPacket.h"
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#include "LogicalLayer.h"
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const int LogicalLayer::PER_PACKET_CRC_POLY = 0x04C11DB7;
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const int LogicalLayer::MAX_BUFFERS = 8;
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#include <iostream>
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using namespace std;
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LogicalLayer::LogicalLayer(sc_module_name name) : sc_module(name){
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SC_THREAD(reset_thread);
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sensitive_pos(clk);
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sensitive_neg(resetx);
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inter = NULL;
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physicalLayer = NULL;
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packetIdCounter = 0;
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retry_mode = false;
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retry_mode_after_reset = false;
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initiate_retry_disconnect = false;
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receivedPacket = NULL;
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receivedDataCount = 0;
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receive_state = RECEIVE_IDLE;
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rx_ack_value = 0;
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rx_retry_waiting_for_nop = false;
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nopSendPacket = NULL;
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currentSendPacket.data = NULL;
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currentSendPacket.packet = NULL;
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disconNop = false;
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ignoreIncoming = false;
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displayReceivedDword = false;
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for(int n = 0; n < 3; n++){
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nextNodeCommandBuffersFree[n] = 0;
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nextNodeDataBuffersFree[n] = 0;
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commandBuffersAdvertised[n] = 0;
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dataBuffersAdvertised[n] = 0;
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commandBuffersFree[n] = MAX_BUFFERS;
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dataBuffersFree[n] = MAX_BUFFERS;
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}
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}
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LogicalLayer::~LogicalLayer(){
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delete nopSendPacket;
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//currentSendPacket is deleted after it's used, no need to delete immediately
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delete receivedPacket;
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//Packets are both in history and packetQueue. Clear packetQueue and delete
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//the entries in packetHistory
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packetQueue.clear();
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//Delete packets in the history
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deque<PacketAndData>::iterator i;
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for(i = packetHistory.begin(); i != packetHistory.end();i++){
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delete (*i).packet;
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delete [] (*i).data;
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}
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}
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void LogicalLayer::reset_thread(){
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while(true){
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if(!resetx.read()){
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retry_mode = retry_mode_after_reset;
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packetIdCounter = 0;
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receivedDataCount = 0;
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rx_ack_value = 0;
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receive_state = RECEIVE_IDLE;
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//Packets are both in history and packetQueue. Clear packetQueue and delete
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//the entries in packetHistory
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packetQueue.clear();
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//Delete packets in the history
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deque<PacketAndData>::iterator i;
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for(i = packetHistory.begin(); i != packetHistory.end();i++){
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delete (*i).packet;
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delete [] (*i).data;
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}
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packetHistory.clear();
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for(int n = 0; n < 3; n++){
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nextNodeCommandBuffersFree[n] = 0;
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nextNodeDataBuffersFree[n] = 0;
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commandBuffersAdvertised[n] = 0;
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dataBuffersAdvertised[n] = 0;
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}
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}
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wait();
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}
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}
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void LogicalLayer::receivedDwordEvent(sc_bv<32> &dword,bool lctl,bool hctl){
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if(displayReceivedDword) cout << "Received dword: " << dword.to_string(SC_HEX) << endl;
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//If reset or during a retry sequence, ignore the received data
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if(!resetx.read() || initiate_retry_disconnect || ignoreIncoming)return;
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if(receive_state == RECEIVE_SECOND_DWORD){
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//Set the seconde dword of the packet (it only had the first dword set)
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receivedPacket->setSecondDword(dword);
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//If there is any data with that packet, go into receiving data state
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if(receivedPacket->hasDataAssociated()){
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receivedDataCount = 0;
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receive_state = RECEIVE_DATA;
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}
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else{
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//If in retry mode, start by receiving the CRC
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if(retry_mode){
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receive_state = RECEIVE_CRC;
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}
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else{
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//Generate event of received packet and wait for next packet
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receive_state = RECEIVE_IDLE;
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inter->receivedHtPacketEvent(receivedPacket,NULL,this);
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updateRxBufferCount(receivedPacket);
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}
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}
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}
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else if(receive_state == RECEIVE_DATA){
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//If CTL is activated, it is a nop inside data
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if(lctl || hctl){
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if(retry_mode){
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firstReceivedDword = dword;
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receive_state = RECEIVE_NOP_CRC;
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}
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else handleNopPacket(dword);
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}
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else{
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//Set the received data
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receivedData[receivedDataCount] = dword.to_int();
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//Check if receiving data is done
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if(receivedDataCount++ == receivedPacket->getDataLengthm1()){
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if(retry_mode){
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receive_state = RECEIVE_CRC;
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}
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else{
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//When it's done, generate event that packet is received
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inter->receivedHtPacketEvent(receivedPacket,receivedData,this);
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updateRxBufferCount(receivedPacket);
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receive_state = RECEIVE_IDLE;
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}
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}
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}
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}
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else if(receive_state == RECEIVE_CRC){
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//Calculate the packet CRC
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int crc = calcultatePacketCrc(receivedPacket,receivedData);
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//CRC is inversed before being sent out, check if it's invalid
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if(~crc != dword.to_int()){
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cout << "Wrong CRC received for packet: " << (*receivedPacket) << endl;
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initiateRetrySequence();
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}
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/**If valid, handle the packet*/
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else{
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//If nop, update the buffer count
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if(receivedPacket->getPacketCommand() == NOP)
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handleNopPacket(firstReceivedDword);
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//Otherwise, notify of received packet and update ack value
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else{
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rx_ack_value++;
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inter->receivedHtPacketEvent(receivedPacket,receivedData,this);
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updateRxBufferCount(receivedPacket);
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}
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}
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receive_state = RECEIVE_IDLE;
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}
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//RECEIVE_NOP_CRC is a state for receiving nops inside data packets. Check
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//if the crc is correct, handle the nop packet and go back to receiving data,
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//or initiate retry sequence if crc is incorrect
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else if(receive_state == RECEIVE_NOP_CRC){
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PacketContainer c = ControlPacket::createPacketFromDword(firstReceivedDword);
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int crc = calcultatePacketCrc(c.getPacketRef(),NULL);
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if(~crc != dword.to_int()) initiateRetrySequence();
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else handleNopPacket(firstReceivedDword);
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receive_state = RECEIVE_DATA;
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}
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//Otherwise in IDLE state
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else{
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//store the received dword
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firstReceivedDword = dword;
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//Create a packet object from the dword
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PacketContainer c = ControlPacket::createPacketFromDword(dword);
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//If its a nop
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if(c->getPacketCommand() == NOP){
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if(retry_mode){
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//Delete any previously allocated packet
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delete receivedPacket;
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receivedPacket = c.giveControl();
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receive_state = RECEIVE_CRC;
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}
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else handleNopPacket(dword);
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}
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//If if only has one dword
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else if(c->isDwordPacket()){
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//If it has any data associated to it, go to receiving data state
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if(c->hasDataAssociated()){
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receive_state = RECEIVE_DATA;
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receivedDataCount = 0;
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//Delete any previously allocated packet
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delete receivedPacket;
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receivedPacket = c.giveControl();
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}
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else{
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//packet received, either receive CRC if in retry mode or generate event
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if(retry_mode){
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receive_state = RECEIVE_CRC;
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//Delete any previously allocated packet
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delete receivedPacket;
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receivedPacket = c.giveControl();
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}
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else{
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inter->receivedHtPacketEvent(c.getPacketRef(),NULL,this);
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updateRxBufferCount(c.getPacketRef());
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}
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}
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}
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//If not dword packet, go to receive second dword state
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else{
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receive_state = RECEIVE_SECOND_DWORD;
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delete receivedPacket;
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receivedPacket = c.giveControl();
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}
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}
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}
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void LogicalLayer::handleNopPacket(sc_bv<32> &dword){
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//Create a nop packet
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NopPacket* nop = new NopPacket(dword);
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//Update the next node buffer free count
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nextNodeCommandBuffersFree[VC_POSTED] += (int)nop->getFreeBufPostedCmd();
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nextNodeDataBuffersFree[VC_POSTED] += (int)nop->getFreeBufPostedData();
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nextNodeCommandBuffersFree[VC_NON_POSTED] += (int)nop->freeBufNonPostedCmd();
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nextNodeDataBuffersFree[VC_NON_POSTED] += (int)nop->freeBufNonPostedData();
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nextNodeCommandBuffersFree[VC_RESPONSE] += (int)nop->freeBufResponseCmd();
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nextNodeDataBuffersFree[VC_RESPONSE] += (int)nop->freeBufResponseData();
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packetIdCounter = (int)nop->getRxNextPacketToAck();
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//If in retry mode, delete old entries in the history
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if(retry_mode){
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bool done = packetHistory.empty();
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while(!done){
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if(((packetIdCounter - packetHistory.front().id + 256) % 256) < 128){
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delete packetHistory.front().packet;
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delete [] packetHistory.front().data;
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packetHistory.pop_front();
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done = packetHistory.empty();
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}
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else done = true;
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}
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}
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}
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void LogicalLayer::dwordToSendRequested(sc_bv<32> &dword,bool &lctl,bool &hctl){
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//during reset, don't send anything
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if(!resetx.read()) return;
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if(send_state == SEND_SECOND_DWORD){
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//get the second dword from the packet
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dword = currentSendPacket.packet->getVector().range(63,32);
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//Command packet have CTL=1
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lctl = true; hctl = true;
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//Go to the correct state depending on packet type
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if(currentSendPacket.packet->hasDataAssociated()){
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sendDataCount = 0;
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send_state = SEND_DATA;
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}
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else{
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if(retry_mode){
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send_state = SEND_CRC;
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| 332 |
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}
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| 333 |
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/** In retry mode, packets are stored in history and can be
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| 334 |
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deleted when history is acknowleged. When not in retry mode,
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| 335 |
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this does not happen so delete immediately after send*/
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| 336 |
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else{
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| 337 |
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delete currentSendPacket.packet;
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| 338 |
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send_state = SEND_IDLE;
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| 339 |
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}
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| 340 |
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}
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| 341 |
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}
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| 342 |
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//If sending an address extension. This is not supported by the tunnel but
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| 343 |
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//should be handle cleanly by responding with an error response. If here,
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| 344 |
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//the address extension has already been sent, now send the actual packet
|
| 345 |
|
|
else if(send_state == SEND_ADDR_EXT){
|
| 346 |
|
|
//send first dword
|
| 347 |
|
|
dword = currentSendPacket.packet->getVector().range(31,0);
|
| 348 |
|
|
|
| 349 |
|
|
//go to correct state depending on packet content
|
| 350 |
|
|
bool has_data = currentSendPacket.packet->hasDataAssociated();
|
| 351 |
|
|
VirtualChannel vc = currentSendPacket.packet->getVirtualChannel();
|
| 352 |
|
|
|
| 353 |
|
|
if(!currentSendPacket.packet->isDwordPacket()){
|
| 354 |
|
|
send_state = SEND_SECOND_DWORD;
|
| 355 |
|
|
}
|
| 356 |
|
|
else if(has_data){
|
| 357 |
|
|
send_state = SEND_DATA;
|
| 358 |
|
|
}
|
| 359 |
|
|
else if(retry_mode){
|
| 360 |
|
|
send_state = SEND_CRC;
|
| 361 |
|
|
}
|
| 362 |
|
|
/** In retry mode, packets are stored in history and can be
|
| 363 |
|
|
deleted when history is acknowleged. When not in retry mode,
|
| 364 |
|
|
this does not happen so delete immediately after send*/
|
| 365 |
|
|
else{
|
| 366 |
|
|
send_state = SEND_IDLE;
|
| 367 |
|
|
delete currentSendPacket.packet;
|
| 368 |
|
|
}
|
| 369 |
|
|
}
|
| 370 |
|
|
else if(send_state == SEND_DATA){
|
| 371 |
|
|
//Check if sending a nop in the middle of the data is necessary
|
| 372 |
|
|
if(isSendingNopRequired()){
|
| 373 |
|
|
//Delete any previous nop packet
|
| 374 |
|
|
delete nopSendPacket;
|
| 375 |
|
|
nopSendPacket = generateNopPacket();
|
| 376 |
|
|
dword = nopSendPacket->getVector().range(31,0);
|
| 377 |
|
|
lctl = true; hctl = true;
|
| 378 |
|
|
if(retry_mode){
|
| 379 |
|
|
send_state = SEND_NOP_CRC;
|
| 380 |
|
|
}
|
| 381 |
|
|
}
|
| 382 |
|
|
//otherwise keep sending data
|
| 383 |
|
|
else{
|
| 384 |
|
|
lctl = false; hctl = false;
|
| 385 |
|
|
dword = currentSendPacket.data[sendDataCount];
|
| 386 |
|
|
if(sendDataCount++ == currentSendPacket.packet->getDataLengthm1()){
|
| 387 |
|
|
if(retry_mode){
|
| 388 |
|
|
send_state = SEND_CRC;
|
| 389 |
|
|
}
|
| 390 |
|
|
/** In retry mode, packets are stored in history and can be
|
| 391 |
|
|
deleted when history is acknowleged. When not in retry mode,
|
| 392 |
|
|
this does not happen so delete immediately after send*/
|
| 393 |
|
|
else{
|
| 394 |
|
|
send_state = SEND_IDLE;
|
| 395 |
|
|
delete currentSendPacket.packet;
|
| 396 |
|
|
delete[] currentSendPacket.data;
|
| 397 |
|
|
}
|
| 398 |
|
|
}
|
| 399 |
|
|
}
|
| 400 |
|
|
}
|
| 401 |
|
|
else if(send_state == SEND_NOP_CRC){
|
| 402 |
|
|
int crc = calcultatePacketCrc(nopSendPacket,NULL);
|
| 403 |
|
|
dword = ~crc;
|
| 404 |
|
|
lctl = true; hctl = false;
|
| 405 |
|
|
send_state = SEND_DATA;
|
| 406 |
|
|
}
|
| 407 |
|
|
else if(send_state == SEND_CRC){
|
| 408 |
|
|
int crc = calcultatePacketCrc(currentSendPacket.packet,currentSendPacket.data);
|
| 409 |
|
|
dword = ~crc;
|
| 410 |
|
|
//Value of lctl and hctl depends on if the packet has data or not
|
| 411 |
|
|
if(currentSendPacket.packet->hasDataAssociated()){
|
| 412 |
|
|
lctl = false; hctl = true;
|
| 413 |
|
|
}
|
| 414 |
|
|
else{
|
| 415 |
|
|
lctl = true; hctl = false;
|
| 416 |
|
|
}
|
| 417 |
|
|
send_state = SEND_IDLE;
|
| 418 |
|
|
|
| 419 |
|
|
//If what was just sent a disconnect nop, then we must complete the retry sequence
|
| 420 |
|
|
if(disconNop){
|
| 421 |
|
|
//reset retry initiation variables
|
| 422 |
|
|
initiate_retry_disconnect = false;
|
| 423 |
|
|
disconNop = false;
|
| 424 |
|
|
|
| 425 |
|
|
//Start the retry disconnect and reconnect on the physical level
|
| 426 |
|
|
physicalLayer->retryDisconnectAndReconnect();
|
| 427 |
|
|
|
| 428 |
|
|
//Clear current list of packets to send
|
| 429 |
|
|
packetQueue.clear();
|
| 430 |
|
|
packetQueue = packetHistory;
|
| 431 |
|
|
for(int n = 0; n < 3; n++){
|
| 432 |
|
|
commandBuffersAdvertised[n] = 0;
|
| 433 |
|
|
dataBuffersAdvertised[n] = 0;
|
| 434 |
|
|
}
|
| 435 |
|
|
}
|
| 436 |
|
|
}
|
| 437 |
|
|
else{
|
| 438 |
|
|
//If a retry sequence should be initiated
|
| 439 |
|
|
if(initiate_retry_disconnect){
|
| 440 |
|
|
//Generate a disconnect nop
|
| 441 |
|
|
delete nopSendPacket;
|
| 442 |
|
|
nopSendPacket = new NopPacket(0,0,0,0,0,0,
|
| 443 |
|
|
true, false, false, 0);
|
| 444 |
|
|
currentSendPacket.packet = nopSendPacket;
|
| 445 |
|
|
currentSendPacket.data = NULL;
|
| 446 |
|
|
disconNop = true;
|
| 447 |
|
|
|
| 448 |
|
|
//Send that disconnect nop
|
| 449 |
|
|
dword = nopSendPacket->getVector().range(31,0); lctl = true; hctl = true;
|
| 450 |
|
|
send_state = SEND_CRC;
|
| 451 |
|
|
}
|
| 452 |
|
|
//Send nop if it is required (for buffer reasons, or if nothing else to send|)
|
| 453 |
|
|
else if(isSendingNopRequired() || packetQueue.empty()){
|
| 454 |
|
|
//Delete any previous nop packet
|
| 455 |
|
|
delete nopSendPacket;
|
| 456 |
|
|
//create a new not
|
| 457 |
|
|
nopSendPacket = generateNopPacket();
|
| 458 |
|
|
currentSendPacket.packet = nopSendPacket;
|
| 459 |
|
|
currentSendPacket.data = NULL;
|
| 460 |
|
|
|
| 461 |
|
|
//Send the nop
|
| 462 |
|
|
dword = currentSendPacket.packet->getVector().range(31,0);
|
| 463 |
|
|
lctl = true; hctl = true;
|
| 464 |
|
|
if(retry_mode){
|
| 465 |
|
|
send_state = SEND_CRC;
|
| 466 |
|
|
}
|
| 467 |
|
|
}
|
| 468 |
|
|
//Otherwise, attempt to send the packet on top of the queue
|
| 469 |
|
|
else{
|
| 470 |
|
|
|
| 471 |
|
|
//Check if the top packet can be sent : check if the next
|
| 472 |
|
|
//node has sufficient buffers to receive it
|
| 473 |
|
|
ControlPacket * cmd = packetQueue.front().packet;
|
| 474 |
|
|
bool has_data = cmd->hasDataAssociated();
|
| 475 |
|
|
VirtualChannel vc = cmd->getVirtualChannel();
|
| 476 |
|
|
bool canBeSent = false;
|
| 477 |
|
|
if(vc <= 2){
|
| 478 |
|
|
canBeSent = nextNodeCommandBuffersFree[vc] &&
|
| 479 |
|
|
(nextNodeDataBuffersFree[vc] || !has_data);
|
| 480 |
|
|
}
|
| 481 |
|
|
bool delete_command = false;
|
| 482 |
|
|
|
| 483 |
|
|
//If it can be sent, go to the appropriate state to send it
|
| 484 |
|
|
if(cmd->getPacketCommand() == NOP){
|
| 485 |
|
|
currentSendPacket = packetQueue.front();
|
| 486 |
|
|
packetQueue.pop_front();
|
| 487 |
|
|
if(retry_mode){
|
| 488 |
|
|
send_state = SEND_CRC;
|
| 489 |
|
|
}
|
| 490 |
|
|
else delete_command = true;
|
| 491 |
|
|
}
|
| 492 |
|
|
if(canBeSent){
|
| 493 |
|
|
nextNodeCommandBuffersFree[vc]--;
|
| 494 |
|
|
if(has_data) nextNodeDataBuffersFree[vc]--;
|
| 495 |
|
|
|
| 496 |
|
|
currentSendPacket = packetQueue.front();
|
| 497 |
|
|
packetQueue.pop_front();
|
| 498 |
|
|
if(cmd->getPacketCommand() == ADDR_EXT){
|
| 499 |
|
|
send_state = SEND_ADDR_EXT;
|
| 500 |
|
|
}
|
| 501 |
|
|
else if(!cmd->isDwordPacket()){
|
| 502 |
|
|
send_state = SEND_SECOND_DWORD;
|
| 503 |
|
|
}
|
| 504 |
|
|
else if(has_data){
|
| 505 |
|
|
send_state = SEND_DATA;
|
| 506 |
|
|
}
|
| 507 |
|
|
else if(retry_mode){
|
| 508 |
|
|
send_state = SEND_CRC;
|
| 509 |
|
|
}
|
| 510 |
|
|
/** In retry mode, packets are stored in history and can be
|
| 511 |
|
|
deleted when history is acknowleged. When not in retry mode,
|
| 512 |
|
|
this does not happen so delete immediately after send*/
|
| 513 |
|
|
else delete_command = true;
|
| 514 |
|
|
}
|
| 515 |
|
|
//Otherwise, send a nop
|
| 516 |
|
|
else{
|
| 517 |
|
|
//cout << "Not enough buffers, sending nop instead" << endl;
|
| 518 |
|
|
delete nopSendPacket;
|
| 519 |
|
|
nopSendPacket = generateNopPacket();
|
| 520 |
|
|
currentSendPacket.packet = nopSendPacket;
|
| 521 |
|
|
currentSendPacket.data = NULL;
|
| 522 |
|
|
if(retry_mode){
|
| 523 |
|
|
send_state = SEND_CRC;
|
| 524 |
|
|
}
|
| 525 |
|
|
}
|
| 526 |
|
|
|
| 527 |
|
|
//If the packet is an address extension, send the address extension first
|
| 528 |
|
|
if(currentSendPacket.packet->getPacketCommand() == ADDR_EXT){
|
| 529 |
|
|
dword = ((AddressExtensionPacket*)(currentSendPacket.packet))->getAddressExtension();
|
| 530 |
|
|
}
|
| 531 |
|
|
//otherwise, send the first dword
|
| 532 |
|
|
else{
|
| 533 |
|
|
dword = currentSendPacket.packet->getVector().range(31,0);
|
| 534 |
|
|
}
|
| 535 |
|
|
if(delete_command) delete cmd;
|
| 536 |
|
|
lctl = true; hctl = true;
|
| 537 |
|
|
}
|
| 538 |
|
|
}
|
| 539 |
|
|
}
|
| 540 |
|
|
|
| 541 |
|
|
void LogicalLayer::crcErrorDetected(){
|
| 542 |
|
|
//If in retry mode, periodic CRC is not checked. In retry mode,
|
| 543 |
|
|
//pass the message up to the next layer
|
| 544 |
|
|
if(!retry_mode)
|
| 545 |
|
|
inter->crcErrorDetected();
|
| 546 |
|
|
}
|
| 547 |
|
|
|
| 548 |
|
|
void LogicalLayer::sendPacket(ControlPacket * packet,int * data){
|
| 549 |
|
|
//Add the packet to the queue
|
| 550 |
|
|
PacketAndData pad;
|
| 551 |
|
|
pad.packet = packet;
|
| 552 |
|
|
pad.data = data;
|
| 553 |
|
|
pad.id = ++packetIdCounter;
|
| 554 |
|
|
packetQueue.push_back(pad);
|
| 555 |
|
|
|
| 556 |
|
|
//If in retry mode, also add it to history
|
| 557 |
|
|
if(retry_mode)
|
| 558 |
|
|
packetHistory.push_back(pad);
|
| 559 |
|
|
}
|
| 560 |
|
|
|
| 561 |
|
|
void LogicalLayer::flush(){
|
| 562 |
|
|
//Wait (block) until all packet are sent
|
| 563 |
|
|
while(!packetQueue.empty())wait();
|
| 564 |
|
|
}
|
| 565 |
|
|
|
| 566 |
|
|
int LogicalLayer::calcultatePacketCrc(ControlPacket * pkt,int * data){
|
| 567 |
|
|
int crc = 0xFFFFFFFF;
|
| 568 |
|
|
sc_bv<32> dword;
|
| 569 |
|
|
|
| 570 |
|
|
if(pkt->getPacketCommand() == ADDR_EXT){
|
| 571 |
|
|
dword = ((AddressExtensionPacket*)(currentSendPacket.packet))->getAddressExtension();
|
| 572 |
|
|
calcultateDwordCrc(crc,dword,true);
|
| 573 |
|
|
}
|
| 574 |
|
|
|
| 575 |
|
|
dword = pkt->getVector().range(31,0);
|
| 576 |
|
|
calcultateDwordCrc(crc,dword,true);
|
| 577 |
|
|
|
| 578 |
|
|
if(!pkt->isDwordPacket()){
|
| 579 |
|
|
dword = pkt->getVector().range(63,32);
|
| 580 |
|
|
calcultateDwordCrc(crc,dword,true);
|
| 581 |
|
|
}
|
| 582 |
|
|
|
| 583 |
|
|
if(pkt->hasDataAssociated()){
|
| 584 |
|
|
int max = (int)pkt->getDataLengthm1();
|
| 585 |
|
|
for(int n = 0; n <= max; n++){
|
| 586 |
|
|
dword = data[n];
|
| 587 |
|
|
calcultateDwordCrc(crc,dword,false);
|
| 588 |
|
|
}
|
| 589 |
|
|
}
|
| 590 |
|
|
return crc;
|
| 591 |
|
|
}
|
| 592 |
|
|
|
| 593 |
|
|
void LogicalLayer::calcultateDwordCrc(int &crc,sc_bv<32> &dword,bool ctl){
|
| 594 |
|
|
for(int n = 0; n < 2; n++){
|
| 595 |
|
|
int ctl_or = ctl ? 0x10000 : 0;
|
| 596 |
|
|
int data = (dword.to_int() >> (n*16)) & 0xFFFF | ctl_or;
|
| 597 |
|
|
|
| 598 |
|
|
for(int i = 0; i < 17; i++){
|
| 599 |
|
|
//xor highest bit w/ message
|
| 600 |
|
|
int tmp = ((crc >> 31 & 1)^((data >> i) & 1));
|
| 601 |
|
|
//substract poly if greater
|
| 602 |
|
|
crc = (tmp) ? (crc << 1) ^ PER_PACKET_CRC_POLY : ((crc << 1) | tmp);
|
| 603 |
|
|
}
|
| 604 |
|
|
}
|
| 605 |
|
|
}
|
| 606 |
|
|
|
| 607 |
|
|
|
| 608 |
|
|
void LogicalLayer::initiateRetrySequence(){
|
| 609 |
|
|
//initiate_retry_disconnect will make the link send a disconnect nop and ignore RX
|
| 610 |
|
|
initiate_retry_disconnect = true;
|
| 611 |
|
|
//Go to idle RX state to be ready for a new packet when coming out of retry sequence
|
| 612 |
|
|
receive_state = RECEIVE_IDLE;
|
| 613 |
|
|
|
| 614 |
|
|
//Clear the current buffer count
|
| 615 |
|
|
for(int n = 0; n < 3; n++){
|
| 616 |
|
|
nextNodeCommandBuffersFree[n] = 0;
|
| 617 |
|
|
nextNodeDataBuffersFree[n] = 0;
|
| 618 |
|
|
}
|
| 619 |
|
|
}
|
| 620 |
|
|
|
| 621 |
|
|
bool LogicalLayer::isSendingNopRequired(){
|
| 622 |
|
|
bool required = false;
|
| 623 |
|
|
for(int n = 0; n < 3; n++){
|
| 624 |
|
|
if((commandBuffersFree[n] - commandBuffersAdvertised[n]) > 2) required = true;
|
| 625 |
|
|
if((dataBuffersFree[n] - dataBuffersAdvertised[n]) > 2) required = true;
|
| 626 |
|
|
}
|
| 627 |
|
|
return required;
|
| 628 |
|
|
}
|
| 629 |
|
|
|
| 630 |
|
|
void LogicalLayer::updateRxBufferCount(ControlPacket * receivedPacket){
|
| 631 |
|
|
VirtualChannel vc = receivedPacket->getVirtualChannel();
|
| 632 |
|
|
bool hasData = receivedPacket->hasDataAssociated();
|
| 633 |
|
|
|
| 634 |
|
|
if(vc == VC_NONE) return;
|
| 635 |
|
|
if(hasData) dataBuffersAdvertised[vc]--;
|
| 636 |
|
|
else commandBuffersAdvertised[vc]--;
|
| 637 |
|
|
}
|
| 638 |
|
|
|
| 639 |
|
|
NopPacket * LogicalLayer::generateNopPacket(){
|
| 640 |
|
|
sc_uint<2> responseBuffersToSend = min((commandBuffersFree[VC_RESPONSE] - commandBuffersAdvertised[VC_RESPONSE]),3);
|
| 641 |
|
|
sc_uint<2> responseDataBuffersToSend = min((dataBuffersFree[VC_RESPONSE] - dataBuffersAdvertised[VC_RESPONSE]),3);
|
| 642 |
|
|
sc_uint<2> postedBuffersToSend = min((commandBuffersFree[VC_POSTED] - commandBuffersAdvertised[VC_POSTED]),3);
|
| 643 |
|
|
sc_uint<2> postedDataBuffersToSend = min((dataBuffersFree[VC_POSTED] - dataBuffersAdvertised[VC_POSTED]),3);
|
| 644 |
|
|
sc_uint<2> npostedBuffersToSend = min((commandBuffersFree[VC_NON_POSTED] - commandBuffersAdvertised[VC_NON_POSTED]),3);
|
| 645 |
|
|
sc_uint<2> npostedDataBuffersToSend = min((dataBuffersFree[VC_NON_POSTED] - dataBuffersAdvertised[VC_NON_POSTED]),3);
|
| 646 |
|
|
|
| 647 |
|
|
commandBuffersAdvertised[VC_RESPONSE] += (int)responseBuffersToSend;
|
| 648 |
|
|
dataBuffersAdvertised[VC_RESPONSE] += (int)responseDataBuffersToSend;
|
| 649 |
|
|
commandBuffersAdvertised[VC_POSTED] += (int)postedBuffersToSend;
|
| 650 |
|
|
dataBuffersAdvertised[VC_POSTED] += (int)postedDataBuffersToSend;
|
| 651 |
|
|
commandBuffersAdvertised[VC_NON_POSTED] += (int)npostedBuffersToSend;
|
| 652 |
|
|
dataBuffersAdvertised[VC_NON_POSTED] += (int)npostedDataBuffersToSend;
|
| 653 |
|
|
|
| 654 |
|
|
return new NopPacket(responseBuffersToSend,
|
| 655 |
|
|
responseDataBuffersToSend,
|
| 656 |
|
|
postedBuffersToSend,
|
| 657 |
|
|
postedDataBuffersToSend,
|
| 658 |
|
|
npostedBuffersToSend,
|
| 659 |
|
|
npostedDataBuffersToSend,
|
| 660 |
|
|
false, false, false, rx_ack_value);
|
| 661 |
|
|
}
|
| 662 |
|
|
|
