a109296bde
full by adding a reserve feature to the packet fifo which allows
us to reserve space in the fifo if only part of a packet was
copied into the fifo.
dev/ns_gige.cc:
use the new reserve feature in the fifo to properly determine
when we're full. assert that adding a packet to the fifo suceeds.
dev/pktfifo.hh:
add the ability to reserve space in the fifo. This is useful for
partial writing of packets into the fifo.
--HG--
extra : convert_revision : 83f871f34fac237bb464c9513cf6490b5c62420e
106 lines
3.1 KiB
C++
106 lines
3.1 KiB
C++
/*
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* Copyright (c) 2002-2004 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __DEV_PKTFIFO_HH__
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#define __DEV_PKTFIFO_HH__
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#include <iosfwd>
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#include <list>
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#include <string>
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#include "dev/etherpkt.hh"
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#include "sim/serialize.hh"
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class Checkpoint;
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class PacketFifo
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{
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protected:
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std::list<PacketPtr> fifo;
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int _maxsize;
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int _size;
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int _reserved;
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public:
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explicit PacketFifo(int max) : _maxsize(max), _size(0) {}
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virtual ~PacketFifo() {}
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int maxsize() const { return _maxsize; }
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int packets() const { return fifo.size(); }
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int size() const { return _size + _reserved; }
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int avail() const { return maxsize() - size(); }
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bool empty() const { return size() == 0; }
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bool full() const { return size() >= maxsize(); }
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int reserve(int len = 0)
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{
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_reserved += len;
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assert(avail() >= 0);
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return _reserved;
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}
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bool push(PacketPtr ptr)
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{
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assert(_reserved <= ptr->length);
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if (avail() < ptr->length - _reserved)
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return false;
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_size += ptr->length;
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fifo.push_back(ptr);
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_reserved = 0;
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return true;
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}
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PacketPtr front() { return fifo.front(); }
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void pop()
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{
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if (empty())
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return;
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_size -= fifo.front()->length;
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fifo.front() = NULL;
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fifo.pop_front();
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}
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void clear()
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{
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fifo.clear();
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_size = 0;
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}
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/**
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* Serialization stuff
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*/
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public:
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void serialize(const std::string &base, std::ostream &os);
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void unserialize(const std::string &base,
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Checkpoint *cp, const std::string §ion);
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};
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#endif // __DEV_PKTFIFO_HH__
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