DIRECTORY
Basics USING [bytesPerWord],
BasicTime USING [GetClockPulses, MicrosecondsToPulses, Pulses],
CommBuffer USING [Overhead],
CommDriver USING [AllocBuffer, Buffer, FreeBuffer, GetNetworkChain, InsertReceiveProc, Network, RecvProc],
CommDriverType USING [Encapsulation, ethernetOneBroadcastHost],
Process USING [SecondsToTicks, SetPriority, SetTimeout, Ticks],
Pup USING [allHosts, Host, nullHost],
XNS USING [broadcastHost, GetThisHost, Host];

XNSEthernetOneTranslation: CEDAR MONITOR
LOCKS cH USING cH: Cache
IMPORTS BasicTime, CommDriver, XNS, Process
EXPORTS CommBuffer
~ {

BYTE: TYPE ~ [0..100H);
bytesPerWord: NAT ~ Basics.bytesPerWord;

Buffer: TYPE ~ CommDriver.Buffer;
Network: TYPE ~ CommDriver.Network;

Encapsulation: PUBLIC TYPE ~ CommDriverType.Encapsulation; -- exported to CommBuffer

thisHost: XNS.Host ~ XNS.GetThisHost[];

Pulses: TYPE ~ BasicTime.Pulses;

MSecsToPulses: PROC [n: LONG CARDINAL] RETURNS[Pulses] ~ INLINE {
RETURN [BasicTime.MicrosecondsToPulses[1000*n]] };

PulsesSince: PROC [then: Pulses] RETURNS[Pulses] ~ INLINE {
RETURN [BasicTime.GetClockPulses[] - then] };


TranslationType: TYPE ~ MACHINE DEPENDENT RECORD [a, b: BYTE];

requestType: TranslationType ~ [010H, 041H];
replyType: TranslationType ~ [00eH, 038H];

HostPair: TYPE ~ MACHINE DEPENDENT RECORD [
nsHost: XNS.Host,
pupHost: Pup.Host,
filler: BYTE];

hostPairBytes: CARDINAL ~ bytesPerWord*SIZE[HostPair]; -- Should be BYTES[HostPair]

TranslationPacketObject: TYPE ~ MACHINE DEPENDENT RECORD [
translationType: TranslationType,
replier: HostPair,
requestor: HostPair];

translationPacketBytes: CARDINAL ~ bytesPerWord*SIZE[TranslationPacketObject]; -- Should be BYTES[TranslationPacketObject]; Must be even!
translationShortPacketBytes: CARDINAL ~ translationPacketBytes - hostPairBytes; -- CROCK: some old implementations send reply packets without the requestor field

TranslationBuffer: TYPE ~ REF TranslationBufferObject;
TranslationBufferObject: TYPE ~ MACHINE DEPENDENT RECORD [
ovh: CommBuffer.Overhead,
translationType: TranslationType,
replier: HostPair,
requestor: HostPair];

numHashHeaders: CARDINAL ~ 101;
HashIndex: TYPE ~ [0..numHashHeaders);

Hash: PROC [nsHost: XNS.Host] RETURNS [HashIndex] ~ INLINE {
RETURN [ nsHost.f MOD numHashHeaders ] };

Cache: TYPE ~ REF CacheObject;
CacheObject: TYPE ~ MONITORED RECORD [
daemon: PROCESS,
event: CONDITION,
newPendingEntry: BOOL _ FALSE,
sweepCheckTime: Pulses _ 0,
sweepChecksUntilSweep: CARDINAL _ sweepChecksPerSweep,
sendHead, sendTail: Buffer,
broadcastHostEntry: CacheEntry,
thisHostEntry: CacheEntry,
pendingEntries: CacheEntry,
validEntries: ARRAY HashIndex OF CacheEntry];


CacheEntry: TYPE ~ REF CacheEntryObject;
CacheEntryObject: TYPE ~ RECORD [
next: CacheEntry,
hosts: HostPair,
referenced: BOOL,
timeStamp: Pulses,
tries: CARDINAL
]; 
pulsesPerSweepCheck: Pulses ~ MSecsToPulses[59500];
sweepCheckTimeout: Process.Ticks ~ Process.SecondsToTicks[60];
sweepChecksPerSweep: CARDINAL ~ 5;

pulsesPerResend: Pulses ~ MSecsToPulses[1500];
resendTimeout: Process.Ticks _ Process.SecondsToTicks[1];

maxTries: CARDINAL ~ 8;

noTranslation: INT _ 0;
notQuick: INT _ 0;

GetEncapsulation: PROC [network: Network, nsHost: XNS.Host] RETURNS [Encapsulation] ~ {
cH: Cache ~ NARROW[network.xns.translation];
eH: CacheEntry _ NIL;
hashIndex: HashIndex ~ Hash[nsHost];

BEGIN
IF (eH _ cH.validEntries[hashIndex]) # NIL THEN {
IF eH.hosts.nsHost = nsHost THEN GOTO Found;
IF (eH _ eH.next) # NIL THEN {
IF eH.hosts.nsHost = nsHost THEN GOTO Found;
NULL; -- more checks would go here ... 
};
};
IF nsHost = XNS.broadcastHost THEN { eH _ cH.broadcastHostEntry; GOTO Found };
IF nsHost = thisHost THEN { eH _ cH.thisHostEntry; GOTO Found };
notQuick _ notQuick.SUCC;
IF (eH _ GetCacheEntry[cH, hashIndex, nsHost]) # NIL THEN GOTO Found;
GOTO NotFound;

EXITS
Found => {
eH.referenced _ TRUE;
TRUSTED { RETURN[ [ethernetOne[etherSpare1~0, etherSpare2~0, etherSpare3~0, etherSpare4~0, etherSpare5~0, ethernetOneDest~eH.hosts.pupHost, ethernetOneSource~network.pup.host, ethernetOneType~xns]] ] }
};
NotFound => {
noTranslation _ noTranslation.SUCC;
TRUSTED { RETURN[ [ethernetOne[etherSpare1~0, etherSpare2~0, etherSpare3~0, etherSpare4~0, etherSpare5~0, ethernetOneDest~Pup.nullHost, ethernetOneSource~network.pup.host, ethernetOneType~translationFailed]] ] }
};
END;
};


GetCacheEntry: ENTRY PROC [cH: Cache, hashIndex: HashIndex, nsHost: XNS.Host] RETURNS [CacheEntry] ~ {

eH, prevH: CacheEntry;

eH _ cH.validEntries[hashIndex];  prevH _ NIL;
WHILE eH # NIL DO
IF eH.hosts.nsHost = nsHost THEN {
IF prevH # NIL THEN {
prevH.next _ eH.next;
eH.next _ cH.validEntries[hashIndex];
cH.validEntries[hashIndex] _ eH };
RETURN[eH] };
prevH _ eH;  eH _ eH.next
ENDLOOP;

FOR eH _ cH.pendingEntries, eH.next WHILE eH # NIL DO
IF eH.hosts.nsHost = nsHost THEN RETURN[NIL];
ENDLOOP;

TRUSTED { cH.pendingEntries _ NEW[ CacheEntryObject _ [next~cH.pendingEntries, hosts~[nsHost~nsHost, pupHost~Pup.allHosts, filler~], referenced~TRUE, timeStamp~BasicTime.GetClockPulses[], tries~0] ] };
cH.newPendingEntry _ TRUE;  NOTIFY cH.event;
RETURN[NIL] };

MakeRequest: PROC [cH: Cache, nsHost: XNS.Host, sendTo: Pup.Host _ Pup.allHosts] RETURNS [b: Buffer] ~ {
bH: TranslationBuffer;
b _ CommDriver.AllocBuffer[];
TRUSTED { bH _ LOOPHOLE[b] };
bH.translationType _ requestType;
bH.replier _ [nsHost~nsHost, pupHost~Pup.nullHost, filler~0];
bH.requestor _ cH.thisHostEntry.hosts;
TRUSTED { bH.ovh.encap _ Encapsulation[ethernetOne[etherSpare1~0, etherSpare2~0, etherSpare3~0, etherSpare4~0, etherSpare5~0, ethernetOneDest~sendTo, ethernetOneSource~cH.thisHostEntry.hosts.pupHost, ethernetOneType~translation]] };
};

ConvertToReply: PROC [cH: Cache, bH: TranslationBuffer] ~ {
bH.translationType _ replyType;
bH.replier _ cH.thisHostEntry.hosts;
TRUSTED { bH.ovh.encap _ Encapsulation[ethernetOne[etherSpare1~0, etherSpare2~0, etherSpare3~0, etherSpare4~0, etherSpare5~0, ethernetOneDest~bH.requestor.pupHost, ethernetOneSource~cH.thisHostEntry.hosts.pupHost, ethernetOneType~translation]] };
};

AddTranslation: ENTRY PROC [cH: Cache, hosts: HostPair] ~ {
eH, prevH: CacheEntry;
i: HashIndex ~ Hash[hosts.nsHost];

eH _ cH.pendingEntries;  prevH _ NIL;
WHILE eH # NIL DO
IF eH.hosts.nsHost = hosts.nsHost THEN {
IF prevH = NIL THEN cH.pendingEntries _ eH.next ELSE prevH.next _ eH.next;
eH.hosts.pupHost _ hosts.pupHost;
EXIT };
prevH _ eH;  eH _ eH.next
ENDLOOP;

IF eH = NIL THEN {
eH _ cH.validEntries[i];  prevH _ NIL;
WHILE eH # NIL DO
IF eH.hosts.nsHost = hosts.nsHost THEN {
IF prevH = NIL THEN cH.validEntries[i] _ eH.next ELSE prevH.next _ eH.next;
IF eH.hosts.pupHost # hosts.pupHost THEN eH _ NIL;
EXIT };
prevH _ eH;  eH _ eH.next
ENDLOOP;
};

IF eH = NIL
THEN cH.validEntries[i] _ NEW[ CacheEntryObject _ [next~cH.validEntries[i], hosts~hosts, referenced~TRUE, timeStamp~BasicTime.GetClockPulses[], tries~0] ]
ELSE { eH.next _ cH.validEntries[i];  cH.validEntries[i] _ eH };
};


requestsReceived: INT _ 0;
repliesReceived: INT _ 0;
tooShort: INT _ 0;
badProtocol: INT _ 0;

RecvTranslation: CommDriver.RecvProc
~ {
cH: Cache ~ NARROW[network.xns.translation];
bH: TranslationBuffer;

IF bytes < translationShortPacketBytes THEN {
tooShort _ tooShort.SUCC;
RETURN [buffer] };

TRUSTED { bH _ LOOPHOLE[buffer] };
SELECT TRUE FROM
bH.translationType = requestType => {
IF bytes < translationPacketBytes THEN {
tooShort _ tooShort.SUCC;
RETURN [buffer] };
IF bH.replier.nsHost = thisHost THEN {
requestsReceived _ requestsReceived.SUCC;
AddTranslation[cH, bH.requestor];
ConvertToReply[cH, bH];
EnqueueForSending[cH, buffer];
buffer _ NIL;
};
};
bH.translationType = replyType => {
repliesReceived _ repliesReceived.SUCC;
AddTranslation[cH, bH.replier];
};
ENDCASE => {
badProtocol _ badProtocol.SUCC };
RETURN[buffer];
};

EnqueueForSending: ENTRY PROC [cH: Cache, b: Buffer] ~ {
IF cH.sendHead = NIL THEN cH.sendHead _ b ELSE cH.sendTail.ovh.next _ b;
cH.sendTail _ b;
b.ovh.next _ NIL;
NOTIFY cH.event };

InternalEnqueueForSending: INTERNAL PROC [cH: Cache, b: Buffer] ~ {
IF cH.sendHead = NIL THEN cH.sendHead _ b ELSE cH.sendTail.ovh.next _ b;
cH.sendTail _ b;
b.ovh.next _ NIL;
NOTIFY cH.event };

DequeueForSending: ENTRY PROC [cH: Cache] RETURNS [b: Buffer] ~ {
IF (b _ cH.sendHead) = NIL THEN RETURN;
IF (cH.sendHead _ NARROW[b.ovh.next]) = NIL THEN cH.sendTail _ NIL;
};

InternalSendQueueIsEmpty: INTERNAL PROC [cH: Cache] RETURNS [BOOL] ~ INLINE {
RETURN [cH.sendHead = NIL] };


WaitAndScanCache: ENTRY PROC [cH: Cache] ~ {
eH, prevH: CacheEntry;

IF InternalSendQueueIsEmpty[cH] AND NOT cH.newPendingEntry THEN {
TRUSTED { IF cH.pendingEntries # NIL
THEN Process.SetTimeout[@cH.event, resendTimeout]
ELSE Process.SetTimeout[@cH.event, sweepCheckTimeout] };
WAIT cH.event };

prevH _ NIL;  eH _ cH.pendingEntries;
WHILE eH # NIL DO
IF PulsesSince[eH.timeStamp] >= pulsesPerResend THEN {
IF eH.tries >= maxTries THEN {
eH _ eH.next;
IF prevH = NIL THEN cH.pendingEntries _ eH ELSE prevH.next _ eH;
LOOP };
eH.tries _ eH.tries + 1;
eH.timeStamp _ BasicTime.GetClockPulses[];
{ buffer: Buffer ~ MakeRequest[cH, eH.hosts.nsHost];
InternalEnqueueForSending[cH, buffer] };
};
prevH _ eH;  eH _ eH.next;
ENDLOOP;
cH.newPendingEntry _ FALSE;

IF PulsesSince[cH.sweepCheckTime] >= pulsesPerSweepCheck THEN {
cH.sweepCheckTime _ BasicTime.GetClockPulses[];
IF cH.sweepChecksUntilSweep = 0
THEN {
FOR i: HashIndex IN [0..numHashHeaders) DO
eH _ cH.validEntries[i];  prevH _ NIL;
WHILE eH # NIL DO
IF eH.referenced
THEN {
eH.referenced _ FALSE;
prevH _ eH;  eH _ eH.next }
ELSE {
eH _ eH.next;
IF prevH = NIL THEN cH.validEntries[i] _ eH ELSE prevH.next _ eH };
ENDLOOP;
ENDLOOP;
cH.sweepChecksUntilSweep _ sweepChecksPerSweep;
}
ELSE {
cH.sweepChecksUntilSweep _ cH.sweepChecksUntilSweep - 1;
};
};

};


Daemon: PROC [network: Network] ~ {
cH: Cache ~ NARROW[ network.xns.translation ];
buffer: Buffer;
Process.SetPriority[3]; -- ???
DO
WaitAndScanCache[cH];
WHILE (buffer _ DequeueForSending[cH]) # NIL DO
network.xns.sendTranslate[network, buffer, translationPacketBytes];
CommDriver.FreeBuffer[buffer];
ENDLOOP;
ENDLOOP;
};

Init: PROC = {
cH: Cache;

FOR network: Network _ CommDriver.GetNetworkChain[], network.next UNTIL network = NIL DO
IF network.type # ethernetOne THEN LOOP;
cH _ NEW[ CacheObject _ [] ];
cH.broadcastHostEntry _ NEW[ CacheEntryObject _ [hosts~[nsHost~XNS.broadcastHost, pupHost~CommDriverType.ethernetOneBroadcastHost, filler~], referenced~, timeStamp~, tries~] ];
cH.thisHostEntry _ NEW[ CacheEntryObject _ [hosts~[nsHost~thisHost, pupHost~network.pup.host, filler~], referenced~, timeStamp~, tries~] ];
network.xns.translation _ cH;
network.xns.getEncapsulation _ GetEncapsulation;
CommDriver.InsertReceiveProc[network~network, type~xnsTranslate, proc~RecvTranslation];
cH.daemon _ FORK Daemon[network];
ENDLOOP;
};


TryHost: PROC [nsHost: XNS.Host] ~ {
FOR network: Network _ CommDriver.GetNetworkChain[], network.next UNTIL network = NIL DO
IF network.type = ethernetOne THEN {
[] _ GetEncapsulation[network, nsHost];  EXIT };
ENDLOOP;
};

TryLogan: PROC ~ { TryHost[ [a~02H, b~60H, c~8cH, d~00H, e~34H, f~48H] ] };

TryHubbard: PROC ~ { TryHost[ [a~02H, b~60H, c~8cH, d~10H, e~89H, f~25H] ] };

Try: PROC [n: LONG CARDINAL] = TRUSTED {
t1: MACHINE DEPENDENT RECORD [b, c: CARDINAL];
t2: MACHINE DEPENDENT RECORD [a, b, c: CARDINAL];
t1 _ LOOPHOLE[n];
t2.a _ 0;  t2.b _ t1.c;  t2.c _ t1.b;
TryHost[ LOOPHOLE[t2] ];
};

Init[];

}.

`XNSEthernetOneTranslation.mesa
Copyright c 1986 by Xerox Corporation.  All rights reserved.
Demers, June 5, 1986 10:38:20 pm PDT

Very freely adapted from translation code in: Cedar6.0>OISCP>EthernetOneDriver.mesa
Birrell on:  9-Oct-81 16:43:32
BLyon on: March 13, 1981  10:47 PM
Levin, August 9, 1983 9:28 am
Russ Atkinson (RRA) February 19, 1985 7:44:43 pm PST
Time
Translation Request / Reply Packets
Translation Entry Cache
Timeouts
Encapsulating NS Packets
Statistics
Quick check of first couple of entries without acquiring ML.
Search for a valid cache entry for the given nsHost.  If a valid entry is found, return it; otherwise return NIL and arrange for an entry to be added.
Move entry to head of list.
Building Request / Reply Packets
Allocate a buffer, build a request packet in it, and return it.
The sendTo parameter is the Pup Host to which the request packet will be sent.  It should be allHosts (broadcast) for a normal request.
Given a request buffer, convert it to the corresponding reply.
Fill in the encapsulation part here, so the buffer can be sent using network.sendTranslate rather than network.return.
Processing Received Translation Packets
Look for a pending entry.
If no pending entry, look for a valid one.
If existing entry is incorrect, drop it on the floor ...
Receive Statistics
[network: Network, buffer: Buffer, bytes: NAT] RETURNS [Buffer]
CROCK: the following test should be "< translationPacketBytes", but some old implementations send reply packets without the requestor field.  Eventually, when the old implementations go away, fix it by moving the other CROCK (below) up to this position.
CROCK: the following test should be moved up to replace the previous CROCK.
Daemon Process
Delete the entry.
Do a sweep check ...
Do a sweep ...
Delete the entry.
Initialization
Install a cache (and start a daemon) for each ethernetOne on the chain.
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