dist_etherlink.cc revision 13766 
1/*
2 * Copyright (c) 2015 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Gabor Dozsa
38 */
39
40/* @file
41 * Device module for a full duplex ethernet link for dist gem5 simulations.
42 */
43
44#include "dev/net/dist_etherlink.hh"
45
46#include <arpa/inet.h>
47#include <sys/socket.h>
48#include <unistd.h>
49
50#include <cmath>
51#include <deque>
52#include <string>
53#include <vector>
54
55#include "base/random.hh"
56#include "base/trace.hh"
57#include "debug/DistEthernet.hh"
58#include "debug/DistEthernetPkt.hh"
59#include "debug/EthernetData.hh"
60#include "dev/net/dist_iface.hh"
61#include "dev/net/etherdump.hh"
62#include "dev/net/etherint.hh"
63#include "dev/net/etherlink.hh"
64#include "dev/net/etherobject.hh"
65#include "dev/net/etherpkt.hh"
66#include "dev/net/tcp_iface.hh"
67#include "params/EtherLink.hh"
68#include "sim/core.hh"
69#include "sim/serialize.hh"
70#include "sim/system.hh"
71
72using namespace std;
73
74DistEtherLink::DistEtherLink(const Params *p)
75    : SimObject(p), linkDelay(p->delay)
76{
77    DPRINTF(DistEthernet,"DistEtherLink::DistEtherLink() "
78            "link delay:%llu ticksPerByte:%f\n", p->delay, p->speed);
79
80    txLink = new TxLink(name() + ".link0", this, p->speed, p->delay_var,
81                        p->dump);
82    rxLink = new RxLink(name() + ".link1", this, p->delay, p->dump);
83
84    Tick sync_repeat;
85    if (p->sync_repeat != 0) {
86        if (p->sync_repeat != p->delay)
87            warn("DistEtherLink(): sync_repeat is %lu and linkdelay is %lu",
88                 p->sync_repeat, p->delay);
89        sync_repeat = p->sync_repeat;
90    } else {
91        sync_repeat = p->delay;
92    }
93
94    // create the dist (TCP) interface to talk to the peer gem5 processes.
95    distIface = new TCPIface(p->server_name, p->server_port,
96                             p->dist_rank, p->dist_size,
97                             p->sync_start, sync_repeat, this,
98                             p->dist_sync_on_pseudo_op, p->is_switch,
99                             p->num_nodes);
100
101    localIface = new LocalIface(name() + ".int0", txLink, rxLink, distIface);
102}
103
104DistEtherLink::~DistEtherLink()
105{
106    delete txLink;
107    delete rxLink;
108    delete localIface;
109    delete distIface;
110}
111
112EtherInt*
113DistEtherLink::getEthPort(const std::string &if_name, int idx)
114{
115    if (if_name != "int0") {
116        return nullptr;
117    } else {
118        panic_if(localIface->getPeer(), "interface already connected to");
119    }
120    return localIface;
121}
122
123void
124DistEtherLink::serialize(CheckpointOut &cp) const
125{
126    distIface->serializeSection(cp, "distIface");
127    txLink->serializeSection(cp, "txLink");
128    rxLink->serializeSection(cp, "rxLink");
129}
130
131void
132DistEtherLink::unserialize(CheckpointIn &cp)
133{
134    distIface->unserializeSection(cp, "distIface");
135    txLink->unserializeSection(cp, "txLink");
136    rxLink->unserializeSection(cp, "rxLink");
137}
138
139void
140DistEtherLink::init()
141{
142    DPRINTF(DistEthernet,"DistEtherLink::init() called\n");
143    distIface->init(rxLink->doneEvent(), linkDelay);
144}
145
146void
147DistEtherLink::startup()
148{
149    DPRINTF(DistEthernet,"DistEtherLink::startup() called\n");
150    distIface->startup();
151}
152
153void
154DistEtherLink::RxLink::setDistInt(DistIface *m)
155{
156    assert(!distIface);
157    distIface = m;
158}
159
160void
161DistEtherLink::RxLink::rxDone()
162{
163    assert(!busy());
164
165    // retrieve the packet that triggered the receive done event
166    packet = distIface->packetIn();
167
168    if (dump)
169        dump->dump(packet);
170
171    DPRINTF(DistEthernetPkt, "DistEtherLink::DistLink::rxDone() "
172            "packet received: len=%d\n", packet->length);
173    DDUMP(EthernetData, packet->data, packet->length);
174
175    localIface->sendPacket(packet);
176
177    packet = nullptr;
178}
179
180void
181DistEtherLink::TxLink::txDone()
182{
183    if (dump)
184        dump->dump(packet);
185
186    packet = nullptr;
187    assert(!busy());
188
189    localIface->sendDone();
190}
191
192bool
193DistEtherLink::TxLink::transmit(EthPacketPtr pkt)
194{
195    if (busy()) {
196        DPRINTF(DistEthernet, "packet not sent, link busy\n");
197        return false;
198    }
199
200    packet = pkt;
201    Tick delay = (Tick)ceil(((double)pkt->simLength * ticksPerByte) + 1.0);
202    if (delayVar != 0)
203        delay += random_mt.random<Tick>(0, delayVar);
204
205    // send the packet to the peers
206    assert(distIface);
207    distIface->packetOut(pkt, delay);
208
209    // schedule the send done event
210    parent->schedule(doneEvent, curTick() + delay);
211
212    return true;
213}
214
215void
216DistEtherLink::Link::serialize(CheckpointOut &cp) const
217{
218    bool packet_exists = (packet != nullptr);
219    SERIALIZE_SCALAR(packet_exists);
220    if (packet_exists)
221        packet->serialize("packet", cp);
222
223    bool event_scheduled = event->scheduled();
224    SERIALIZE_SCALAR(event_scheduled);
225    if (event_scheduled) {
226        Tick event_time = event->when();
227        SERIALIZE_SCALAR(event_time);
228    }
229}
230
231void
232DistEtherLink::Link::unserialize(CheckpointIn &cp)
233{
234    bool packet_exists;
235    UNSERIALIZE_SCALAR(packet_exists);
236    if (packet_exists) {
237        packet = make_shared<EthPacketData>();
238        packet->unserialize("packet", cp);
239    }
240
241    bool event_scheduled;
242    UNSERIALIZE_SCALAR(event_scheduled);
243    if (event_scheduled) {
244        Tick event_time;
245        UNSERIALIZE_SCALAR(event_time);
246        parent->schedule(*event, event_time);
247    }
248}
249
250DistEtherLink::LocalIface::LocalIface(const std::string &name,
251                                       TxLink *tx,
252                                       RxLink *rx,
253                                       DistIface *m) :
254    EtherInt(name), txLink(tx)
255{
256    tx->setLocalInt(this);
257    rx->setLocalInt(this);
258    tx->setDistInt(m);
259    rx->setDistInt(m);
260}
261
262DistEtherLink *
263DistEtherLinkParams::create()
264{
265    return new DistEtherLink(this);
266}
267
268
269