etherbus.cc revision 4762 
1/*
2 * Copyright (c) 2002-2005 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;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Nathan Binkert
29 */
30
31/* @file
32 * Device module for modelling an ethernet hub
33 */
34
35#include <cmath>
36#include <deque>
37#include <string>
38#include <vector>
39
40#include "base/trace.hh"
41#include "dev/etherbus.hh"
42#include "dev/etherdump.hh"
43#include "dev/etherint.hh"
44#include "dev/etherpkt.hh"
45#include "params/EtherBus.hh"
46#include "sim/core.hh"
47
48using namespace std;
49
50EtherBus::EtherBus(const string &name, double speed, bool loop,
51                   EtherDump *packet_dump)
52    : SimObject(name), ticksPerByte(speed), loopback(loop),
53      event(&mainEventQueue, this), sender(0), dump(packet_dump)
54{
55}
56
57void
58EtherBus::txDone()
59{
60    devlist_t::iterator i = devlist.begin();
61    devlist_t::iterator end = devlist.end();
62
63    DPRINTF(Ethernet, "ethernet packet received: length=%d\n", packet->length);
64    DDUMP(EthernetData, packet->data, packet->length);
65
66    while (i != end) {
67        if (loopback || *i != sender)
68            (*i)->sendPacket(packet);
69        ++i;
70    }
71
72    sender->sendDone();
73
74    if (dump)
75        dump->dump(packet);
76
77    sender = 0;
78    packet = 0;
79}
80
81void
82EtherBus::reg(EtherInt *dev)
83{ devlist.push_back(dev); }
84
85bool
86EtherBus::send(EtherInt *sndr, EthPacketPtr &pkt)
87{
88    if (busy()) {
89        DPRINTF(Ethernet, "ethernet packet not sent, bus busy\n", curTick);
90        return false;
91    }
92
93    DPRINTF(Ethernet, "ethernet packet sent: length=%d\n", pkt->length);
94    DDUMP(EthernetData, pkt->data, pkt->length);
95
96    packet = pkt;
97    sender = sndr;
98    int delay = (int)ceil(((double)pkt->length * ticksPerByte) + 1.0);
99    DPRINTF(Ethernet, "scheduling packet: delay=%d, (rate=%f)\n",
100            delay, ticksPerByte);
101    event.schedule(curTick + delay);
102
103    return true;
104}
105
106EtherBus *
107EtherBusParams::create()
108{
109    return new EtherBus(name, speed, loopback, dump);
110}
111