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/*
* Copyright (c) 2003 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* @file
* Device module for modelling an ethernet hub
*/
#include <cmath>
#include <deque>
#include <string>
#include <vector>
#include "base/trace.hh"
#include "dev/etherbus.hh"
#include "dev/etherdump.hh"
#include "dev/etherint.hh"
#include "dev/etherpkt.hh"
#include "sim/builder.hh"
#include "sim/universe.hh"
using namespace std;
EtherBus::EtherBus(const string &name, double rate, bool loop,
EtherDump *packet_dump)
: SimObject(name), ticks_per_byte(rate), loopback(loop),
event(&mainEventQueue, this),
sender(0), dump(packet_dump)
{ }
void
EtherBus::txDone()
{
devlist_t::iterator i = devlist.begin();
devlist_t::iterator end = devlist.end();
DPRINTF(Ethernet, "ethernet packet received: length=%d\n", packet->length);
DDUMP(EthernetData, packet->data, packet->length);
while (i != end) {
if (loopback || *i != sender)
(*i)->sendPacket(packet);
++i;
}
sender->sendDone();
if (dump)
dump->dump(packet);
sender = 0;
packet = 0;
}
void
EtherBus::reg(EtherInt *dev)
{ devlist.push_back(dev); }
bool
EtherBus::send(EtherInt *sndr, PacketPtr pkt)
{
if (busy()) {
DPRINTF(Ethernet, "ethernet packet not sent, bus busy\n", curTick);
return false;
}
DPRINTF(Ethernet, "ethernet packet sent: length=%d\n", pkt->length);
DDUMP(EthernetData, pkt->data, pkt->length);
packet = pkt;
sender = sndr;
int delay = (int)ceil(((double)pkt->length * ticks_per_byte) + 1.0);
DPRINTF(Ethernet, "scheduling packet: delay=%d, (rate=%f)\n",
delay, ticks_per_byte);
event.schedule(curTick + delay);
return true;
}
BEGIN_DECLARE_SIM_OBJECT_PARAMS(EtherBus)
Param<bool> loopback;
Param<int> speed;
SimObjectParam<EtherDump *> packet_dump;
END_DECLARE_SIM_OBJECT_PARAMS(EtherBus)
BEGIN_INIT_SIM_OBJECT_PARAMS(EtherBus)
INIT_PARAM_DFLT(loopback,
"send the packet back to the interface from which it came",
true),
INIT_PARAM_DFLT(speed, "bus speed in bits per second", 100000000),
INIT_PARAM_DFLT(packet_dump, "object to dump network packets to", NULL)
END_INIT_SIM_OBJECT_PARAMS(EtherBus)
CREATE_SIM_OBJECT(EtherBus)
{
double rate = ((double)ticksPerSecond * 8.0) / (double)speed;
return new EtherBus(getInstanceName(), rate, loopback, packet_dump);
}
REGISTER_SIM_OBJECT("EtherBus", EtherBus)
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