tcp_iface.hh

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/*
 * Copyright (c) 2015 ARM Limited
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 * 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
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 * modified or unmodified, in source code or in binary form.
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/* @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"
 
namespace gem5
{
 
class EventManager;
 
class TCPIface : public DistIface
{
  private:
    int sock;
 
    std::string serverName;
    int serverPort;
 
    bool isSwitch;
 
    bool listening;
    static bool anyListening;
    static int fdStatic;
 
    struct NodeInfo
    {
        unsigned rank;
        unsigned distIfaceId;
        unsigned distIfaceNum;
    };
    static std::vector<std::pair<NodeInfo, int> > nodes;
    static std::vector<int> sockRegistry;
 
  private:
 
    void
    sendTCP(int sock, const void *buf, unsigned length);
 
    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:
    TCPIface(std::string server_name, unsigned server_port,
             unsigned dist_rank, unsigned dist_size,
             Tick sync_start, Tick sync_repeat, EventManager *em,
             bool use_pseudo_op, bool is_switch, int num_nodes);
 
    ~TCPIface() override;
};
 
} // namespace gem5
 
#endif // __DEV_NET_TCP_IFACE_HH__