etherbus.cc revision 7823 
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 Params *p)
51    : EtherObject(p), ticksPerByte(p->speed), loopback(p->loopback),
52      event(this), sender(0), dump(p->dump)
53{
54}
55
56void
57EtherBus::txDone()
58{
59    devlist_t::iterator i = devlist.begin();
60    devlist_t::iterator end = devlist.end();
61
62    DPRINTF(Ethernet, "ethernet packet received: length=%d\n", packet->length);
63    DDUMP(EthernetData, packet->data, packet->length);
64
65    while (i != end) {
66        if (loopback || *i != sender)
67            (*i)->sendPacket(packet);
68        ++i;
69    }
70
71    sender->sendDone();
72
73    if (dump)
74        dump->dump(packet);
75
76    sender = 0;
77    packet = 0;
78}
79
80EtherInt*
81EtherBus::getEthPort(const std::string &if_name, int idx)
82{
83    panic("Etherbus doesn't work\n");
84}
85
86bool
87EtherBus::send(EtherInt *sndr, EthPacketPtr &pkt)
88{
89    if (busy()) {
90        DPRINTF(Ethernet, "ethernet packet not sent, bus busy\n", curTick());
91        return false;
92    }
93
94    DPRINTF(Ethernet, "ethernet packet sent: length=%d\n", pkt->length);
95    DDUMP(EthernetData, pkt->data, pkt->length);
96
97    packet = pkt;
98    sender = sndr;
99    int delay = (int)ceil(((double)pkt->length * ticksPerByte) + 1.0);
100    DPRINTF(Ethernet, "scheduling packet: delay=%d, (rate=%f)\n",
101            delay, ticksPerByte);
102    schedule(event, curTick() + delay);
103
104    return true;
105}
106
107EtherBus *
108EtherBusParams::create()
109{
110    return new EtherBus(this);
111}
112