src/dev/net/pktfifo.cc

   1 /*
   2  * Copyright (c) 2004-2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Nathan Binkert
  29  */
  30
  31 #include "dev/net/pktfifo.hh"
  32
  33 #include "base/misc.hh"
  34
  35 using namespace std;
  36
  37 bool
  38 PacketFifo::copyout(void *dest, unsigned offset, unsigned len)
  39 {
  40     char *data = (char *)dest;
  41     if (offset + len >= size())
  42         return false;
  43
  44     iterator i = fifo.begin();
  45     iterator end = fifo.end();
  46     while (len > 0) {
  47         EthPacketPtr &pkt = i->packet;
  48         while (offset >= pkt->length) {
  49             offset -= pkt->length;
  50             ++i;
  51         }
  52
  53         if (i == end)
  54             panic("invalid fifo");
  55
  56         unsigned size = min(pkt->length - offset, len);
  57         memcpy(data, pkt->data, size);
  58         offset = 0;
  59         len -= size;
  60         data += size;
  61         ++i;
  62     }
  63
  64     return true;
  65 }
  66
  67
  68 void
  69 PacketFifoEntry::serialize(const string &base, CheckpointOut &cp) const
  70 {
  71     packet->serialize(base + ".packet", cp);
  72     paramOut(cp, base + ".slack", slack);
  73     paramOut(cp, base + ".number", number);
  74     paramOut(cp, base + ".priv", priv);
  75 }
  76
  77 void
  78 PacketFifoEntry::unserialize(const string &base, CheckpointIn &cp)
  79 {
  80     packet = make_shared<EthPacketData>(16384);
  81     packet->unserialize(base + ".packet", cp);
  82     paramIn(cp, base + ".slack", slack);
  83     paramIn(cp, base + ".number", number);
  84     paramIn(cp, base + ".priv", priv);
  85 }
  86
  87 void
  88 PacketFifo::serialize(const string &base, CheckpointOut &cp) const
  89 {
  90     paramOut(cp, base + ".size", _size);
  91     paramOut(cp, base + ".maxsize", _maxsize);
  92     paramOut(cp, base + ".reserved", _reserved);
  93     paramOut(cp, base + ".packets", fifo.size());
  94
  95     int i = 0;
  96     for (const auto &entry : fifo)
  97         entry.serialize(csprintf("%s.entry%d", base, i++), cp);
  98 }
  99
 100 void
 101 PacketFifo::unserialize(const string &base, CheckpointIn &cp)
 102 {
 103     paramIn(cp, base + ".size", _size);
 104 //  paramIn(cp, base + ".maxsize", _maxsize);
 105     paramIn(cp, base + ".reserved", _reserved);
 106     int fifosize;
 107     paramIn(cp, base + ".packets", fifosize);
 108
 109     fifo.clear();
 110
 111     for (int i = 0; i < fifosize; ++i) {
 112         PacketFifoEntry entry;
 113         entry.unserialize(csprintf("%s.entry%d", base, i), cp);
 114         fifo.push_back(entry);
 115     }
 116 }