1/*
2 * Copyright (c) 2014 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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42
43EtherSwitch::EtherSwitch(const Params *p)
44 : EtherObject(p), ttl(p->time_to_live)
45{
46 for (int i = 0; i < p->port_interface_connection_count; ++i) {
47 std::string interfaceName = csprintf("%s.interface%d", name(), i);
48 Interface *interface = new Interface(interfaceName, this,
49 p->output_buffer_size, p->delay,
50 p->delay_var, p->fabric_speed, i);
51 interfaces.push_back(interface);
52 }
53}
54
55EtherSwitch::~EtherSwitch()
56{
57 for (auto it : interfaces)
58 delete it;

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67 return nullptr;
68
69 Interface *interface = interfaces.at(idx);
70 panic_if(interface->getPeer(), "interface already connected\n");
71
72 return interface;
73}
74
75bool
76EtherSwitch::Interface::PortFifo::push(EthPacketPtr ptr, unsigned senderId)
77{
78 assert(ptr->length);
79
80 _size += ptr->length;
81 fifo.emplace_hint(fifo.end(), ptr, curTick(), senderId);
82
83 // Drop the extra pushed packets from end of the fifo
84 while (avail() < 0) {
85 DPRINTF(Ethernet, "Fifo is full. Drop packet: len=%d\n",
86 std::prev(fifo.end())->packet->length);
87
88 _size -= std::prev(fifo.end())->packet->length;
89 fifo.erase(std::prev(fifo.end()));
90 }
91
92 if (empty()) {
93 warn("EtherSwitch: Packet length (%d) exceeds the maximum storage "
94 "capacity of port fifo (%d)", ptr->length, _maxsize);
95 }
96
97 // Return true if the newly pushed packet gets inserted
98 // at the head of the queue, otherwise return false
99 // We need this information to deschedule the event that has been
100 // scheduled for the old head of queue packet and schedule a new one
101 if (!empty() && fifo.begin()->packet == ptr) {
102 return true;
103 }
104 return false;
105}
106
107void
108EtherSwitch::Interface::PortFifo::pop()
109{
110 if (empty())
111 return;
112
113 assert(_size >= fifo.begin()->packet->length);
114 // Erase the packet at the head of the queue
115 _size -= fifo.begin()->packet->length;
116 fifo.erase(fifo.begin());
117}
118
119void
120EtherSwitch::Interface::PortFifo::clear()
121{
122 fifo.clear();
123 _size = 0;
124}
125
126EtherSwitch::Interface::Interface(const std::string &name,
127 EtherSwitch *etherSwitch,
128 uint64_t outputBufferSize, Tick delay,
129 Tick delay_var, double rate, unsigned id)
130 : EtherInt(name), ticksPerByte(rate), switchDelay(delay),
131 delayVar(delay_var), interfaceId(id), parent(etherSwitch),
132 outputFifo(name + ".outputFifo", outputBufferSize), txEvent(this)
133{
134}
135
136bool
137EtherSwitch::Interface::recvPacket(EthPacketPtr packet)
138{
139 Net::EthAddr destMacAddr(packet->data);
140 Net::EthAddr srcMacAddr(&packet->data[6]);
141
142 learnSenderAddr(srcMacAddr, this);
143 Interface *receiver = lookupDestPort(destMacAddr);
144
145 if (!receiver || destMacAddr.multicast() || destMacAddr.broadcast()) {
146 for (auto it : parent->interfaces)
147 if (it != this)
148 it->enqueue(packet, interfaceId);
149 } else {
150 DPRINTF(Ethernet, "sending packet from MAC %x on port "
151 "%s to MAC %x on port %s\n", uint64_t(srcMacAddr),
152 this->name(), uint64_t(destMacAddr), receiver->name());
153
154 receiver->enqueue(packet, interfaceId);
155 }
156 // At the output port, we either have buffer space (no drop) or
157 // don't (drop packet); in both cases packet is received on
158 // the interface successfully and there is no notion of busy
159 // interface here (as we don't have inputFifo)
160 return true;
161}
162
163void
164EtherSwitch::Interface::enqueue(EthPacketPtr packet, unsigned senderId)
165{
166 // assuming per-interface transmission events,
167 // if the newly push packet gets inserted at the head of the queue
168 // (either there was nothing in the queue or the priority of the new
169 // packet was higher than the packets already in the fifo)
170 // then we need to schedule an event at
171 // "curTick" + "switchingDelay of the packet at the head of the fifo"
172 // to send this packet out the external link
173 // otherwise, there is already a txEvent scheduled
174 if (outputFifo.push(packet, senderId)) {
175 parent->reschedule(txEvent, curTick() + switchingDelay());
176 }
177}
178
179void
180EtherSwitch::Interface::transmit()
181{
182 // there should be something in the output queue
183 assert(!outputFifo.empty());

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254 it->second.lastUseTime = curTick();
255 }
256}
257
258void
259EtherSwitch::serialize(CheckpointOut &cp) const
260{
261 for (auto it : interfaces)
262 it->serializeSection(cp, it->name());
263
264}
265
266void
267EtherSwitch::unserialize(CheckpointIn &cp)
268{
269 for (auto it : interfaces)
270 it->unserializeSection(cp, it->name());
271
272}
273
274void
275EtherSwitch::Interface::serialize(CheckpointOut &cp) const
276{
277 bool event_scheduled = txEvent.scheduled();
278 SERIALIZE_SCALAR(event_scheduled);
279
280 if (event_scheduled) {
281 Tick event_time = txEvent.when();
282 SERIALIZE_SCALAR(event_time);
283 }
284 outputFifo.serializeSection(cp, "outputFifo");
285}
286
287void
288EtherSwitch::Interface::unserialize(CheckpointIn &cp)
289{
290 bool event_scheduled;
291 UNSERIALIZE_SCALAR(event_scheduled);
292
293 if (event_scheduled) {
294 Tick event_time;
295 UNSERIALIZE_SCALAR(event_time);
296 parent->schedule(txEvent, event_time);
297 }
298 outputFifo.unserializeSection(cp, "outputFifo");
299}
300
301void
302EtherSwitch::Interface::PortFifoEntry::serialize(CheckpointOut &cp) const
303{
304 packet->serialize("packet", cp);
305 SERIALIZE_SCALAR(recvTick);
306 SERIALIZE_SCALAR(srcId);
307}
308
309void
310EtherSwitch::Interface::PortFifoEntry::unserialize(CheckpointIn &cp)
311{
312 packet = make_shared<EthPacketData>(16384);
313 packet->unserialize("packet", cp);
314 UNSERIALIZE_SCALAR(recvTick);
315 UNSERIALIZE_SCALAR(srcId);
316}
317
318void
319EtherSwitch::Interface::PortFifo::serialize(CheckpointOut &cp) const
320{
321 SERIALIZE_SCALAR(_size);
322 int fifosize = fifo.size();
323
324 SERIALIZE_SCALAR(fifosize);
325
326 int i = 0;
327 for (const auto &entry : fifo)
328 entry.serializeSection(cp, csprintf("entry%d", i++));
329}
330
331void
332EtherSwitch::Interface::PortFifo::unserialize(CheckpointIn &cp)
333{
334 UNSERIALIZE_SCALAR(_size);
335 int fifosize;
336
337 UNSERIALIZE_SCALAR(fifosize);
338 fifo.clear();
339
340 for (int i = 0; i < fifosize; ++i) {
341 PortFifoEntry entry(nullptr, 0, 0);
342
343 entry.unserializeSection(cp, csprintf("entry%d", i));
344
345 fifo.insert(entry);
346
347 }
348}
349
350EtherSwitch *
351EtherSwitchParams::create()
352{
353 return new EtherSwitch(this);
354}