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// -*- c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t -*-
// Copyright (c) 2001-2009 XORP, Inc.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License, Version 2, June
// 1991 as published by the Free Software Foundation. Redistribution
// and/or modification of this program under the terms of any other
// version of the GNU General Public License is not permitted.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For more details,
// see the GNU General Public License, Version 2, a copy of which can be
// found in the XORP LICENSE.gpl file.
//
// XORP Inc, 2953 Bunker Hill Lane, Suite 204, Santa Clara, CA 95054, USA;
// http://xorp.net
#include "rip_module.h"
#include "libxorp/xorp.h"
#include "libxorp/xlog.h"
#include "libxorp/ipv4.hh"
#include "libxorp/ipv6.hh"
#include "packet_queue.hh"
template <typename A>
PacketQueue<A>::PacketQueue()
: _buffered_bytes(0), _max_buffered_bytes(64000), _drops(0)
{
}
template <typename A>
PacketQueue<A>::~PacketQueue()
{
flush_packets();
}
template <typename A>
void
PacketQueue<A>::enqueue_packet(const RipPacket<A>* pkt)
{
while (_buffered_bytes + pkt->data_bytes() >= _max_buffered_bytes
&& drop_old() == true) {
// XXX: Empty body
}
_buffered_bytes += pkt->data_bytes();
_ready_packets.push_back(pkt);
}
template <typename A>
bool
PacketQueue<A>::empty() const
{
return _ready_packets.empty();
}
template <typename A>
const RipPacket<A>*
PacketQueue<A>::head() const
{
if (_ready_packets.empty())
return 0;
return _ready_packets.front();
}
template <typename A>
void
PacketQueue<A>::pop_head()
{
if (_ready_packets.empty() == false) {
_buffered_bytes -= _ready_packets.front()->data_bytes();
delete _ready_packets.front();
_ready_packets.pop_front();
}
}
template <typename A>
bool
PacketQueue<A>::drop_old()
{
if (_ready_packets.empty() == false) {
typename QueueRep::iterator i = ++_ready_packets.begin();
if (i != _ready_packets.end()) {
XLOG_INFO("Dropping outbound RIP packet");
delete *i;
_ready_packets.erase(i);
_drops++;
return true;
}
}
return false;
}
template <typename A>
uint32_t
PacketQueue<A>::drop_count() const
{
return _drops;
}
template <typename A>
void
PacketQueue<A>::reset_drop_count()
{
_drops = 0;
}
template <typename A>
void
PacketQueue<A>::flush_packets()
{
while (_ready_packets.empty() == false) {
_buffered_bytes -= _ready_packets.front()->data_bytes();
delete _ready_packets.front();
_ready_packets.pop_front();
}
XLOG_ASSERT(_buffered_bytes == 0);
}
template <typename A>
void
PacketQueue<A>::set_max_buffered_bytes(uint32_t mbb)
{
_max_buffered_bytes = mbb;
}
template <typename A>
uint32_t
PacketQueue<A>::max_buffered_bytes() const
{
return _max_buffered_bytes;
}
template <typename A>
uint32_t
PacketQueue<A>::buffered_bytes() const
{
return _buffered_bytes;
}
// ----------------------------------------------------------------------------
// Instantiations
#ifdef INSTANTIATE_IPV4
template class PacketQueue<IPv4>;
#endif
#ifdef INSTANTIATE_IPV6
template class PacketQueue<IPv6>;
#endif
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