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/*
* Copyright (c) 2015 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* 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: Gabor Dozsa
*/
/* @file
* Header packet class for dist-gem5 runs.
*
* For a high level description about dist-gem5 see comments in
* header file dist_iface.hh.
*
* The DistHeaderPkt class defines the format of message headers
* sent among gem5 processes during a dist gem5 simulation. A header packet
* can either carry the description of data packet (i.e. a simulated Ethernet
* packet) or a synchronisation related control command. In case of
* data packet description, the corresponding data packet always follows
* the header packet back-to-back.
*/
#ifndef __DEV_DIST_PACKET_HH__
#define __DEV_DIST_PACKET_HH__
#include <cstring>
#include "base/types.hh"
class DistHeaderPkt
{
private:
DistHeaderPkt() {}
~DistHeaderPkt() {}
public:
enum class ReqType { immediate, collective, pending, none };
/**
* The msg type defines what information a dist header packet carries.
*/
enum class MsgType
{
dataDescriptor,
cmdSyncReq,
cmdSyncAck,
unknown
};
struct Header
{
/**
* The msg type field is valid for all header packets.
*
* @note senderRank is used with data packets while collFlags are used
* by sync ack messages to trigger collective ckpt or exit events.
*/
MsgType msgType;
Tick sendTick;
union {
Tick sendDelay;
Tick syncRepeat;
};
union {
/**
* Actual length of the simulated Ethernet packet.
*/
unsigned dataPacketLength;
struct {
ReqType needCkpt;
ReqType needExit;
};
};
};
};
#endif
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