OutputUnit.hh

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/*
 * Copyright (c) 2020 Inria
 * Copyright (c) 2016 Georgia Institute of Technology
 * Copyright (c) 2008 Princeton University
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#ifndef __MEM_RUBY_NETWORK_GARNET2_0_OUTPUTUNIT_HH__
#define __MEM_RUBY_NETWORK_GARNET2_0_OUTPUTUNIT_HH__

#include <iostream>
#include <vector>

#include "base/compiler.hh"
#include "mem/ruby/common/Consumer.hh"
#include "mem/ruby/network/garnet2.0/CommonTypes.hh"
#include "mem/ruby/network/garnet2.0/NetworkLink.hh"
#include "mem/ruby/network/garnet2.0/OutVcState.hh"

class CreditLink;
class Router;

class OutputUnit : public Consumer
{
  public:
    OutputUnit(int id, PortDirection direction, Router *router);
    ~OutputUnit() = default;
    void set_out_link(NetworkLink *link);
    void set_credit_link(CreditLink *credit_link);
    void wakeup();
    flitBuffer* getOutQueue();
    void print(std::ostream& out) const {};
    void decrement_credit(int out_vc);
    void increment_credit(int out_vc);
    bool has_credit(int out_vc);
    bool has_free_vc(int vnet);
    int select_free_vc(int vnet);

    inline PortDirection get_direction() { return m_direction; }

    int
    get_credit_count(int vc)
    {
        return outVcState[vc].get_credit_count();
    }

    inline int
    get_outlink_id()
    {
        return m_out_link->get_id();
    }

    inline void
    set_vc_state(VC_state_type state, int vc, Cycles curTime)
    {
      outVcState[vc].setState(state, curTime);
    }

    inline bool
    is_vc_idle(int vc, Cycles curTime)
    {
        return (outVcState[vc].isInState(IDLE_, curTime));
    }

    void insert_flit(flit *t_flit);

    uint32_t functionalWrite(Packet *pkt);

  private:
    Router *m_router;
    int M5_CLASS_VAR_USED m_id;
    PortDirection m_direction;
    int m_vc_per_vnet;
    NetworkLink *m_out_link;
    CreditLink *m_credit_link;

    // This is for the network link to consume
    flitBuffer outBuffer;
    // vc state of downstream router
    std::vector<OutVcState> outVcState;
};

#endif // __MEM_RUBY_NETWORK_GARNET2_0_OUTPUTUNIT_HH__