1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/*
* 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.
*
* Authors: Nathan Binkert
*/
#ifndef __DEV_NET_PKTFIFO_HH__
#define __DEV_NET_PKTFIFO_HH__
#include <iosfwd>
#include <list>
#include <string>
#include "base/misc.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)
{
_reserved += len;
assert(avail() >= 0);
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__
|
