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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
* Mohammad Alian
*/
/* @file
* TCP stream socket based interface class for dist-gem5 runs.
*
* For a high level description about dist-gem5 see comments in
* header file dist_iface.hh.
*
* Each gem5 process connects to the server (another gem5 process which
* simulates a switch box) via a stream socket. The server process
* transfers messages and co-ordinates the synchronisation among the gem5
* peers.
*/
#ifndef __DEV_NET_TCP_IFACE_HH__
#define __DEV_NET_TCP_IFACE_HH__
#include <string>
#include "dev/net/dist_iface.hh"
class EventManager;
class TCPIface : public DistIface
{
private:
/**
* The stream socket to connect to the server.
*/
int sock;
std::string serverName;
int serverPort;
bool isSwitch;
bool listening;
static bool anyListening;
static int fdStatic;
/**
* Compute node info and storage for the very first connection from each
* node (used by the switch)
*/
struct NodeInfo
{
unsigned rank;
unsigned distIfaceId;
unsigned distIfaceNum;
};
static std::vector<std::pair<NodeInfo, int> > nodes;
/**
* Storage for all opened sockets
*/
static std::vector<int> sockRegistry;
private:
/**
* Send out a message through a TCP stream socket.
*
* @param sock TCP stream socket.
* @param buf Start address of the message.
* @param length Size of the message in bytes.
*/
void
sendTCP(int sock, const void *buf, unsigned length);
/**
* Receive the next incoming message through a TCP stream socket.
*
* @param sock TCP stream socket.
* @param buf Start address of buffer to store the message.
* @param length Exact size of the expected message in bytes.
*/
bool recvTCP(int sock, void *buf, unsigned length);
bool listen(int port);
void accept();
void connect();
int getfdStatic() const { return fdStatic; }
bool islistening() const { return listening; }
bool anyislistening() const { return anyListening; }
void establishConnection();
protected:
void sendPacket(const Header &header,
const EthPacketPtr &packet) override;
void sendCmd(const Header &header) override;
bool recvHeader(Header &header) override;
void recvPacket(const Header &header, EthPacketPtr &packet) override;
void initTransport() override;
public:
/**
* The ctor creates and connects the stream socket to the server.
* @param server_name The name (or IP address) of the host running the
* server process.
* @param server_port The port number the server listening for new
* connections.
* @param sync_start The tick for the first dist synchronisation.
* @param sync_repeat The frequency of dist synchronisation.
* @param em The EventManager object associated with the simulated
* Ethernet link.
*/
TCPIface(std::string server_name, unsigned server_port,
unsigned dist_rank, unsigned dist_size,
Tick sync_start, Tick sync_repeat, EventManager *em,
bool is_switch, int num_nodes);
~TCPIface() override;
};
#endif // __DEV_NET_TCP_IFACE_HH__
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