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/*
* Copyright (c) 2004-2005 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.
*/
#ifndef __DEV_PKTFIFO_HH__
#define __DEV_PKTFIFO_HH__
#include <iosfwd>
#include <list>
#include <string>
#include "dev/etherpkt.hh"
#include "sim/serialize.hh"
class Checkpoint;
class PacketFifo
{
public:
typedef std::list<EthPacketPtr> fifo_list;
typedef fifo_list::iterator iterator;
protected:
std::list<EthPacketPtr> fifo;
int _maxsize;
int _size;
int _reserved;
public:
explicit PacketFifo(int max) : _maxsize(max), _size(0), _reserved(0) {}
virtual ~PacketFifo() {}
int packets() const { return fifo.size(); }
int maxsize() const { return _maxsize; }
int size() const { return _size; }
int reserved() const { return _reserved; }
int avail() const { return _maxsize - _size - _reserved; }
bool empty() const { return size() <= 0; }
bool full() const { return avail() <= 0; }
int reserve(int len = 0)
{
_reserved += len;
assert(avail() >= 0);
return _reserved;
}
iterator begin() { return fifo.begin(); }
iterator end() { return fifo.end(); }
EthPacketPtr front() { return fifo.front(); }
bool push(EthPacketPtr ptr)
{
assert(ptr->length);
assert(_reserved <= ptr->length);
assert(ptr->slack == 0);
if (avail() < ptr->length - _reserved)
return false;
_size += ptr->length;
fifo.push_back(ptr);
_reserved = 0;
return true;
}
void pop()
{
if (empty())
return;
EthPacketPtr &packet = fifo.front();
_size -= packet->length;
_size -= packet->slack;
packet->slack = 0;
packet = NULL;
fifo.pop_front();
}
void clear()
{
for (iterator i = begin(); i != end(); ++i)
(*i)->slack = 0;
fifo.clear();
_size = 0;
_reserved = 0;
}
void remove(iterator i)
{
EthPacketPtr &packet = *i;
if (i != fifo.begin()) {
iterator prev = i;
--prev;
assert(prev != fifo.end());
(*prev)->slack += packet->length;
} else {
_size -= packet->length;
_size -= packet->slack;
}
packet->slack = 0;
packet = NULL;
fifo.erase(i);
}
bool copyout(void *dest, int offset, int len);
int countPacketsBefore(iterator end)
{
iterator i = fifo.begin();
int count = 0;
while (i != end) {
++count;
++i;
}
return count;
}
int countPacketsAfter(iterator i)
{
iterator end = fifo.end();
int count = 0;
while (i != end) {
++count;
++i;
}
return count;
}
/**
* Serialization stuff
*/
public:
void serialize(const std::string &base, std::ostream &os);
void unserialize(const std::string &base,
Checkpoint *cp, const std::string §ion);
};
#endif // __DEV_PKTFIFO_HH__
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