void xyyx_flatfly( const Router *r, const Flit *f, int in_channel,
OutputSet *outputs, bool inject )
{
// ( Traffic Class , Routing Order ) -> Virtual Channel Range
int vcBegin = 0, vcEnd = gNumVCs-1;
if ( f->type == Flit::READ_REQUEST ) {
vcBegin = gReadReqBeginVC;
vcEnd = gReadReqEndVC;
} else if ( f->type == Flit::WRITE_REQUEST ) {
vcBegin = gWriteReqBeginVC;
vcEnd = gWriteReqEndVC;
} else if ( f->type == Flit::READ_REPLY ) {
vcBegin = gReadReplyBeginVC;
vcEnd = gReadReplyEndVC;
} else if ( f->type == Flit::WRITE_REPLY ) {
vcBegin = gWriteReplyBeginVC;
vcEnd = gWriteReplyEndVC;
}
assert(((f->vc >= vcBegin) && (f->vc <= vcEnd)) || (inject && (f->vc < 0)));
int out_port;
if(inject) {
out_port = 0;
} else {
int dest = flatfly_transformation(f->dest);
int targetr = (int)(dest/gC);
if(targetr==r->GetID()){ //if we are at the final router, yay, output to client
out_port = dest - targetr*gC;
} else {
//each class must have at least 2 vcs assigned or else xy_yx will deadlock
int const available_vcs = (vcEnd - vcBegin + 1) / 2;
assert(available_vcs > 0);
// randomly select dimension order at first hop
bool x_then_y = ((in_channel < gC) ?
(RandomInt(1) > 0) :
(f->vc < (vcBegin + available_vcs)));
if(x_then_y) {
out_port = flatfly_outport(dest, r->GetID());
vcEnd -= available_vcs;
} else {
out_port = flatfly_outport_yx(dest, r->GetID());
vcBegin += available_vcs;
}
}
}
outputs->Clear( );
outputs->AddRange( out_port , vcBegin, vcEnd );
}
void xyyx_flatfly( const Router *r, const Flit *f, int in_channel,
OutputSet *outputs, bool inject )
{
outputs->Clear( );
int dest = flatfly_transformation(f->dest);
int targetr= (int)(dest/gC);
int out_port = -1;
if(in_channel<gC){
if(RandomInt(1)){
f->x_then_y = true;
} else {
f->x_then_y = false;
}
}
if(targetr==r->GetID()){ //if we are at the final router, yay, output to client
out_port = dest - targetr*gC;
} else{
if(f->x_then_y){
out_port = flatfly_outport(dest, r->GetID());
} else {
out_port = flatfly_outport_yx(dest, r->GetID());
}
}
int vcBegin = 0, vcEnd = gNumVCS-1;
int available_vcs = 0;
//each class must have ast east 2 vcs assigned or else xy_yx will deadlock
if ( f->type == Flit::READ_REQUEST ) {
available_vcs = (gReadReqEndVC-gReadReqBeginVC)+1;
vcBegin = gReadReqBeginVC;
} else if ( f->type == Flit::WRITE_REQUEST ) {
available_vcs = (gWriteReqEndVC-gWriteReqBeginVC)+1;
vcBegin = gWriteReqBeginVC;
} else if ( f->type == Flit::READ_REPLY ) {
available_vcs = (gReadReplyEndVC-gReadReplyBeginVC)+1;
vcBegin = gReadReplyBeginVC;
} else if ( f->type == Flit::WRITE_REPLY ) {
available_vcs = (gWriteReplyEndVC-gWriteReplyBeginVC)+1;
vcBegin = gWriteReplyBeginVC;
} else if ( f->type == Flit::ANY_TYPE ) {
available_vcs = gNumVCS;
vcBegin = 0;
}
assert( available_vcs>=2);
if(f->x_then_y){
vcEnd =vcBegin +(available_vcs>>1)-1;
}else{
//same as ugal except uses xyyx routing
void ugal_xyyx_flatfly_onchip( const Router *r, const Flit *f, int in_channel,
OutputSet *outputs, bool inject )
{
// ( Traffic Class , Routing Order ) -> Virtual Channel Range
int vcBegin = 0, vcEnd = gNumVCs-1;
if ( f->type == Flit::READ_REQUEST ) {
vcBegin = gReadReqBeginVC;
vcEnd = gReadReqEndVC;
} else if ( f->type == Flit::WRITE_REQUEST ) {
vcBegin = gWriteReqBeginVC;
vcEnd = gWriteReqEndVC;
} else if ( f->type == Flit::READ_REPLY ) {
vcBegin = gReadReplyBeginVC;
vcEnd = gReadReplyEndVC;
} else if ( f->type == Flit::WRITE_REPLY ) {
vcBegin = gWriteReplyBeginVC;
vcEnd = gWriteReplyEndVC;
}
assert(((f->vc >= vcBegin) && (f->vc <= vcEnd)) || (inject && (f->vc < 0)));
int out_port;
if(inject) {
out_port = 0;
} else {
int dest = flatfly_transformation(f->dest);
int rID = r->GetID();
int _concentration = gC;
int found;
int debug = 0;
int tmp_out_port, _ran_intm;
int _min_hop, _nonmin_hop, _min_queucnt, _nonmin_queucnt;
int threshold = 2;
if ( in_channel < gC ){
if(gTrace){
cout<<"New Flit "<<f->src<<endl;
}
f->ph = 0;
}
if(gTrace){
int load = 0;
cout<<"Router "<<rID<<endl;
cout<<"Input Channel "<<in_channel<<endl;
//need to modify router to report the buffere depth
load +=r->GetBuffer(in_channel);
cout<<"Rload "<<load<<endl;
}
if (debug){
cout << " FLIT ID: " << f->id << " Router: " << rID << " routing from src : " << f->src << " to dest : " << dest << " f->ph: " <<f->ph << " intm: " << f->intm << endl;
}
// f->ph == 0 ==> make initial global adaptive decision
// f->ph == 1 ==> route nonminimaly to random intermediate node
// f->ph == 2 ==> route minimally to destination
found = 0;
if (f->ph == 1){
dest = f->intm;
}
if (dest >= rID*_concentration && dest < (rID+1)*_concentration) {
if (f->ph == 1) {
f->ph = 2;
dest = flatfly_transformation(f->dest);
if (debug) cout << " done routing to intermediate ";
}
else {
found = 1;
out_port = dest % gC;
if (debug) cout << " final routing to destination ";
}
}
if (!found) {
int const xy_available_vcs = (vcEnd - vcBegin + 1) / 2;
assert(xy_available_vcs > 0);
// randomly select dimension order at first hop
bool x_then_y = ((in_channel < gC) ?
(RandomInt(1) > 0) :
(f->vc < (vcBegin + xy_available_vcs)));
if (f->ph == 0) {
//find the min port and min distance
_min_hop = find_distance(flatfly_transformation(f->src),dest);
if(x_then_y){
tmp_out_port = flatfly_outport(dest, rID);
} else {
tmp_out_port = flatfly_outport_yx(dest, rID);
}
if (f->watch){
cout << " MIN tmp_out_port: " << tmp_out_port;
}
//sum over all vcs of that port
_min_queucnt = r->GetCredit(tmp_out_port, -1, -1);
//find the nonmin router, nonmin port, nonmin count
_ran_intm = find_ran_intm(flatfly_transformation(f->src), dest);
_nonmin_hop = find_distance(flatfly_transformation(f->src),_ran_intm) + find_distance(_ran_intm, dest);
if(x_then_y){
tmp_out_port = flatfly_outport(_ran_intm, rID);
} else {
tmp_out_port = flatfly_outport_yx(_ran_intm, rID);
}
if (f->watch){
cout << " NONMIN tmp_out_port: " << tmp_out_port << endl;
}
if (_ran_intm >= rID*_concentration && _ran_intm < (rID+1)*_concentration) {
_nonmin_queucnt = numeric_limits<int>::max();
} else {
_nonmin_queucnt = r->GetCredit(tmp_out_port, -1, -1);
}
if (debug){
cout << " _min_hop " << _min_hop << " _min_queucnt: " <<_min_queucnt << " _nonmin_hop: " << _nonmin_hop << " _nonmin_queucnt :" << _nonmin_queucnt << endl;
}
if (_min_hop * _min_queucnt <= _nonmin_hop * _nonmin_queucnt +threshold) {
if (debug) cout << " Route MINIMALLY " << endl;
f->ph = 2;
} else {
// route non-minimally
f->minimal = 0;
if (debug) { cout << " Route NONMINIMALLY int node: " <<_ran_intm << endl; }
f->ph = 1;
f->intm = _ran_intm;
dest = f->intm;
if (dest >= rID*_concentration && dest < (rID+1)*_concentration) {
f->ph = 2;
dest = flatfly_transformation(f->dest);
}
}
}
//dest here should be == intm if ph==1, or dest == dest if ph == 2
if(x_then_y){
out_port = flatfly_outport(dest, rID);
if(out_port >= gC) {
vcEnd -= xy_available_vcs;
}
} else {
out_port = flatfly_outport_yx(dest, rID);
if(out_port >= gC) {
vcBegin += xy_available_vcs;
}
}
// if we haven't reached our destination, restrict VCs appropriately to avoid routing deadlock
if(out_port >= gC) {
int const ph_available_vcs = xy_available_vcs / 2;
assert(ph_available_vcs > 0);
if(f->ph == 1) {
vcEnd -= ph_available_vcs;
} else {
assert(f->ph == 2);
vcBegin += ph_available_vcs;
}
}
found = 1;
}
if (!found) {
cout << " ERROR: output not found in routing. " << endl;
cout << *f; exit (-1);
}
if (out_port >= gN*(gK-1) + gC) {
cout << " ERROR: output port too big! " << endl;
cout << " OUTPUT select: " << out_port << endl;
cout << " router radix: " << gN*(gK-1) + gK << endl;
exit (-1);
}
if (debug) cout << " through output port : " << out_port << endl;
if(gTrace){cout<<"Outport "<<out_port<<endl;cout<<"Stop Mark"<<endl;}
}
outputs->Clear( );
outputs->AddRange( out_port , vcBegin, vcEnd );
}
//The initial XY or YX minimal routing direction is chosen adaptively
void adaptive_xyyx_flatfly( const Router *r, const Flit *f, int in_channel,
OutputSet *outputs, bool inject )
{
// ( Traffic Class , Routing Order ) -> Virtual Channel Range
int vcBegin = 0, vcEnd = gNumVCs-1;
if ( f->type == Flit::READ_REQUEST ) {
vcBegin = gReadReqBeginVC;
vcEnd = gReadReqEndVC;
} else if ( f->type == Flit::WRITE_REQUEST ) {
vcBegin = gWriteReqBeginVC;
vcEnd = gWriteReqEndVC;
} else if ( f->type == Flit::READ_REPLY ) {
vcBegin = gReadReplyBeginVC;
vcEnd = gReadReplyEndVC;
} else if ( f->type == Flit::WRITE_REPLY ) {
vcBegin = gWriteReplyBeginVC;
vcEnd = gWriteReplyEndVC;
}
assert(((f->vc >= vcBegin) && (f->vc <= vcEnd)) || (inject && (f->vc < 0)));
int out_port;
if(inject) {
out_port = -1;
} else {
int dest = flatfly_transformation(f->dest);
int targetr = (int)(dest/gC);
if(targetr==r->GetID()){ //if we are at the final router, yay, output to client
out_port = dest % gC;
} else {
//each class must have at least 2 vcs assigned or else xy_yx will deadlock
int const available_vcs = (vcEnd - vcBegin + 1) / 2;
assert(available_vcs > 0);
int out_port_xy = flatfly_outport(dest, r->GetID());
int out_port_yx = flatfly_outport_yx(dest, r->GetID());
// Route order (XY or YX) determined when packet is injected
// into the network, adaptively
bool x_then_y;
if(in_channel < gC){
int credit_xy = r->GetUsedCredit(out_port_xy);
int credit_yx = r->GetUsedCredit(out_port_yx);
if(credit_xy > credit_yx) {
x_then_y = false;
} else if(credit_xy < credit_yx) {
x_then_y = true;
} else {
x_then_y = (RandomInt(1) > 0);
}
} else {
x_then_y = (f->vc < (vcBegin + available_vcs));
}
if(x_then_y) {
out_port = out_port_xy;
vcEnd -= available_vcs;
} else {
out_port = out_port_yx;
vcBegin += available_vcs;
}
}
}
outputs->Clear( );
outputs->AddRange( out_port , vcBegin, vcEnd );
}
