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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_NET_PKTFIFO_HH__
#define __DEV_NET_PKTFIFO_HH__
#include <iosfwd>
#include <list>
#include <string>
#include "base/logging.hh"
#include "dev/net/etherpkt.hh"
#include "sim/serialize.hh"
class Checkpoint;
struct PacketFifoEntry
{
EthPacketPtr packet;
uint64_t number;
unsigned slack;
int priv;
PacketFifoEntry()
{
clear();
}
PacketFifoEntry(const PacketFifoEntry &s)
: packet(s.packet), number(s.number), slack(s.slack), priv(s.priv)
{
}
PacketFifoEntry(EthPacketPtr p, uint64_t n)
: packet(p), number(n), slack(0), priv(-1)
{
}
void clear()
{
packet = NULL;
number = 0;
slack = 0;
priv = -1;
}
void serialize(const std::string &base, CheckpointOut &cp) const;
void unserialize(const std::string &base, CheckpointIn &cp);
};
class PacketFifo
{
public:
typedef std::list<PacketFifoEntry> fifo_list;
typedef fifo_list::iterator iterator;
typedef fifo_list::const_iterator const_iterator;
protected:
std::list<PacketFifoEntry> fifo;
uint64_t _counter;
unsigned _maxsize;
unsigned _size;
unsigned _reserved;
public:
explicit PacketFifo(int max)
: _counter(0), _maxsize(max), _size(0), _reserved(0) {}
virtual ~PacketFifo() {}
unsigned packets() const { return fifo.size(); }
unsigned maxsize() const { return _maxsize; }
unsigned size() const { return _size; }
unsigned reserved() const { return _reserved; }
unsigned avail() const { return _maxsize - _size - _reserved; }
bool empty() const { return size() <= 0; }
bool full() const { return avail() <= 0; }
unsigned
reserve(unsigned len = 0)
{
assert(avail() >= len);
_reserved += len;
return _reserved;
}
iterator begin() { return fifo.begin(); }
iterator end() { return fifo.end(); }
const_iterator begin() const { return fifo.begin(); }
const_iterator end() const { return fifo.end(); }
EthPacketPtr front() { return fifo.begin()->packet; }
bool push(EthPacketPtr ptr)
{
assert(ptr->length);
assert(_reserved <= ptr->length);
if (avail() < ptr->length - _reserved)
return false;
_size += ptr->length;
PacketFifoEntry entry;
entry.packet = ptr;
entry.number = _counter++;
fifo.push_back(entry);
_reserved = 0;
return true;
}
void pop()
{
if (empty())
return;
iterator entry = fifo.begin();
_size -= entry->packet->length;
_size -= entry->slack;
entry->packet = NULL;
fifo.pop_front();
}
void clear()
{
for (iterator i = begin(); i != end(); ++i)
i->clear();
fifo.clear();
_size = 0;
_reserved = 0;
}
void remove(iterator i)
{
if (i != fifo.begin()) {
iterator prev = i;
--prev;
assert(prev != fifo.end());
prev->slack += i->packet->length;
prev->slack += i->slack;
} else {
_size -= i->packet->length;
_size -= i->slack;
}
i->clear();
fifo.erase(i);
}
bool copyout(void *dest, unsigned offset, unsigned len);
int countPacketsBefore(const_iterator i) const
{
if (i == fifo.end())
return 0;
return i->number - fifo.begin()->number;
}
int countPacketsAfter(const_iterator i) const
{
auto end = fifo.end();
if (i == end)
return 0;
return (--end)->number - i->number;
}
void check() const
{
unsigned total = 0;
for (auto i = begin(); i != end(); ++i)
total += i->packet->length + i->slack;
if (total != _size)
panic("total (%d) is not == to size (%d)\n", total, _size);
}
/**
* Serialization stuff
*/
public:
void serialize(const std::string &base, CheckpointOut &cp) const;
void unserialize(const std::string &base, CheckpointIn &cp);
};
#endif // __DEV_NET_PKTFIFO_HH__