/*
 * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
 * All rights reserved.
 *
 * 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.
 */

/*
 * The SimpleNetwork class implements the interconnection
 * SimpleNetwork between components (processor/cache components and
 * memory/directory components).  The interconnection network as
 * described here is not a physical network, but a programming concept
 * used to implement all communication between components.  Thus parts
 * of this 'network' may model the on-chip connections between cache
 * controllers and directory controllers as well as the links between
 * chip and network switches.
 *
 * Two conceptual networks, an address and data network, are modeled.
 * The data network is unordered, where the address network provides
 * and conforms to a global ordering of all transactions.
 *
 * Currently the data network is point-to-point and the address
 * network is a broadcast network. These two distinct conceptual
 * network can be modeled as physically separate networks or
 * multiplexed over a single physical network.
 *
 * The network encapsulates all notion of virtual global time and is
 * responsible for ordering the network transactions received.  This
 * hides all of these ordering details from the processor/cache and
 * directory/memory modules.
 *
 * FIXME: Various flavor of networks are provided as a compiler time
 *        configurable. We currently include this SimpleNetwork in the
 *        makefile's vpath, so that SimpleNetwork.cc can provide an alternative
 *        version constructor for the abstract Network class. It is easy to
 *        modify this to make network a runtime configuable. Just make the
 *        abstract Network class take a enumeration parameter, and based on
 *        that to initial proper network. Or even better, just make the ruby
 *        system initializer choose the proper network to initiate.
 */

#ifndef __MEM_RUBY_NETWORK_SIMPLE_SIMPLENETWORK_HH__
#define __MEM_RUBY_NETWORK_SIMPLE_SIMPLENETWORK_HH__

#include <iostream>
#include <vector>

#include "mem/ruby/common/Global.hh"
#include "mem/ruby/network/Network.hh"
#include "mem/ruby/system/NodeID.hh"
#include "params/SimpleNetwork.hh"
#include "sim/sim_object.hh"

class NetDest;
class MessageBuffer;
class Throttle;
class Switch;
class Topology;

class SimpleNetwork : public Network
{
  public:
    typedef SimpleNetworkParams Params;
    SimpleNetwork(const Params *p);
    ~SimpleNetwork();

    void init();

    void printStats(std::ostream& out) const;
    void clearStats();
    void printConfig(std::ostream& out) const;

    void reset();

    // returns the queue requested for the given component
    MessageBuffer* getToNetQueue(NodeID id, bool ordered, int network_num);
    MessageBuffer* getFromNetQueue(NodeID id, bool ordered, int network_num);
    virtual const std::vector<Throttle*>* getThrottles(NodeID id) const;

    bool isVNetOrdered(int vnet) { return m_ordered[vnet]; }
    bool validVirtualNetwork(int vnet) { return m_in_use[vnet]; }

    int getNumNodes() {return m_nodes; }

    // Methods used by Topology to setup the network
    void makeOutLink(SwitchID src, NodeID dest,
        const NetDest& routing_table_entry, int link_latency, int link_weight,
        int bw_multiplier, bool isReconfiguration);
    void makeInLink(SwitchID src, NodeID dest,
        const NetDest& routing_table_entry, int link_latency,
        int bw_multiplier, bool isReconfiguration);
    void makeInternalLink(SwitchID src, NodeID dest,
        const NetDest& routing_table_entry, int link_latency, int link_weight,
        int bw_multiplier, bool isReconfiguration);

    void print(std::ostream& out) const;

  private:
    void checkNetworkAllocation(NodeID id, bool ordered, int network_num);
    void addLink(SwitchID src, SwitchID dest, int link_latency);
    void makeLink(SwitchID src, SwitchID dest,
        const NetDest& routing_table_entry, int link_latency);
    SwitchID createSwitch();
    void makeTopology();
    void linkTopology();

    // Private copy constructor and assignment operator
    SimpleNetwork(const SimpleNetwork& obj);
    SimpleNetwork& operator=(const SimpleNetwork& obj);

    // vector of queues from the components
    std::vector<std::vector<MessageBuffer*> > m_toNetQueues;
    std::vector<std::vector<MessageBuffer*> > m_fromNetQueues;

    std::vector<bool> m_in_use;
    std::vector<bool> m_ordered;
    std::vector<Switch*> m_switch_ptr_vector;
    std::vector<MessageBuffer*> m_buffers_to_free;
    std::vector<Switch*> m_endpoint_switches;
};

inline std::ostream&
operator<<(std::ostream& out, const SimpleNetwork& obj)
{
    obj.print(out);
    out << std::flush;
    return out;
}

#endif // __MEM_RUBY_NETWORK_SIMPLE_SIMPLENETWORK_HH__