stream_gen.hh

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/*
 * Copyright (c) 2018 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
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 * Authors: Giacomo Travaglini
 */

#ifndef __CPU_TRAFFIC_GEN_STREAM_GEN_HH__
#define __CPU_TRAFFIC_GEN_STREAM_GEN_HH__

#include "params/BaseTrafficGen.hh"

class StreamGen
{
  protected:
    StreamGen(const BaseTrafficGenParams *p)
      : streamIds(p->sids), substreamIds(p->ssids)
    {
        // A non empty vector of StreamIDs must be provided.
        // SubstreamIDs are not mandatory hence having an empty
        // vector means that they are not used and no configuration
        // error must be thrown
        fatal_if(streamIds.empty(),
            "Must provide a vector of StreamIDs");
    }

  public:
    virtual ~StreamGen() {};

    virtual uint32_t pickStreamID() = 0;
    virtual uint32_t pickSubStreamID() = 0;

    static StreamGen* create(const BaseTrafficGenParams *p);

    bool ssidValid() const { return !substreamIds.empty(); }

  protected:
    std::vector<uint32_t> streamIds;
    std::vector<uint32_t> substreamIds;
};

class FixedStreamGen : public StreamGen
{
  public:
    FixedStreamGen(const BaseTrafficGenParams *p)
      : StreamGen(p)
    {
        // For a fixed stream generator only one sid must be provided. The
        // ssid can have either 0 (not used) or 1 value.
        fatal_if(streamIds.size() != 1 || substreamIds.size() > 1,
                 "Invalid sids/ssids configuration");
    }

    uint32_t pickStreamID() override
    { return streamIds[0]; }

    uint32_t pickSubStreamID() override
    { return substreamIds[0]; }
};

class RandomStreamGen : public StreamGen
{
  public:
    RandomStreamGen(const BaseTrafficGenParams *p)
      : StreamGen(p)
    {}

    uint32_t pickStreamID() override
    { return randomPick(streamIds); }

    uint32_t pickSubStreamID() override
    { return randomPick(substreamIds); }

  protected:
    uint32_t randomPick(const std::vector<uint32_t> &svec);
};

#endif // __CPU_TRAFFIC_GEN_STREAM_GEN_HH__