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#include "dev/net/etherbus.hh"
35
36#include <cmath>
37#include <deque>
38#include <string>
39#include <vector>
40
41#include "base/logging.hh"
42#include "base/trace.hh"
43#include "debug/Ethernet.hh"
44#include "debug/EthernetData.hh"
45#include "dev/net/etherdump.hh"
46#include "dev/net/etherint.hh"
47#include "dev/net/etherpkt.hh"
48#include "params/EtherBus.hh"
49#include "sim/core.hh"
50
51using namespace std;
52
53EtherBus::EtherBus(const Params *p)
54    : SimObject(p), ticksPerByte(p->speed), loopback(p->loopback),
55      event([this]{ txDone(); }, "ethernet bus completion"),
56      sender(0), dump(p->dump)
57{
58}
59
60void
61EtherBus::txDone()
62{
63    devlist_t::iterator i = devlist.begin();
64    devlist_t::iterator end = devlist.end();
65
66    DPRINTF(Ethernet, "ethernet packet received: length=%d\n", packet->length);
67    DDUMP(EthernetData, packet->data, packet->length);
68
69    while (i != end) {
70        if (loopback || *i != sender)
71            (*i)->sendPacket(packet);
72        ++i;
73    }
74
75    sender->sendDone();
76
77    if (dump)
78        dump->dump(packet);
79
80    sender = 0;
81    packet = 0;
82}
83
84Port &
85EtherBus::getPort(const std::string &if_name, PortID idx)
86{
87    panic("Etherbus doesn't work\n");
88}
89
90bool
91EtherBus::send(EtherInt *sndr, EthPacketPtr &pkt)
92{
93    if (busy()) {
94        DPRINTF(Ethernet, "ethernet packet not sent, bus busy\n", curTick());
95        return false;
96    }
97
98    DPRINTF(Ethernet, "ethernet packet sent: length=%d\n", pkt->length);
99    DDUMP(EthernetData, pkt->data, pkt->length);
100
101    packet = pkt;
102    sender = sndr;
103    int delay = (int)ceil(((double)pkt->simLength * ticksPerByte) + 1.0);
104    DPRINTF(Ethernet, "scheduling packet: delay=%d, (rate=%f)\n",
105            delay, ticksPerByte);
106    schedule(event, curTick() + delay);
107
108    return true;
109}
110
111EtherBus *
112EtherBusParams::create()
113{
114    return new EtherBus(this);
115}
116