phy.h

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/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1997 Regents of the University of California.
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    must display the following acknowledgement:
 *  This product includes software developed by the Computer Systems
 *  Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS 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
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 *
 * Ported from CMU/Monarch's code, nov'98 -Padma Haldar.
 *
 * @(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/mac/phy.h,v 1.7 2000/08/17 00:03:38 haoboy Exp $
 *
 * superclass for all network interfaces
 
 ===================================================================

 * Phy represents the hardware that actually controls the channel
 * access for the node. Phy transmits/receives pkts from the channel
 * to which it is connected. No pkts are buffered at this layer as
 * the decision to send has already been made and the packet is on
 * its way to the "Channel".
 *==================================================================
 */

#ifndef ns_phy_h
#define ns_phy_h

#include <assert.h>
#include "bi-connector.h"
#include "lib/bsd-list.h"

class Phy;
LIST_HEAD(if_head, Phy);

#include "channel.h"
#include "node.h"
#include "mac.h"

class Node;
class LinkHead;
/*--------------------------------------------------------------
  Phy : Base class for all network interfaces used to control
  channel access
 ---------------------------------------------------------------*/

class Phy : public BiConnector {
 public:
    Phy();

    void recv(Packet* p, Handler* h);
    
    virtual void sendDown(Packet *p)=0;
    
    virtual int sendUp(Packet *p)=0;

    inline double  txtime(Packet *p) {
        return (hdr_cmn::access(p)->size() * 8.0) / bandwidth_; }
    inline double txtime(int bytes) {
        return (8.0 * bytes / bandwidth_); }
    virtual double  bittime() const { return 1/bandwidth_; }

    // list of all network interfaces on a channel
    Phy* nextchnl(void) const { return chnl_link_.le_next; }
    inline void insertchnl(struct if_head *head) {
        LIST_INSERT_HEAD(head, this, chnl_link_);
        //channel_ = chnl;
    }
    // list of all network interfaces on a node
    Phy* nextnode(void) const { return node_link_.le_next; }
    inline void insertnode(struct if_head* head) {
        LIST_INSERT_HEAD(head, this, node_link_);
        //node_ = node;
    }
    inline void removechnl() {
        LIST_REMOVE(this, chnl_link_);
    }
    void setchnl (Channel *chnl) { channel_ = chnl; }
    virtual void setnode (Node *node) { node_ = node; }
    virtual Node* node(void) const { return node_; }
    virtual Channel* channel(void) const {return channel_;} 
    
    virtual void    dump(void) const;
    LinkHead* head() { return head_; }

 protected:
    //void      drop(Packet *p);
    int     command(int argc, const char*const* argv);
    int             index_;
    
    Node* node_;
    LinkHead* head_; // the entry point of this network stack
  
    /*
   * A list of all "network interfaces" on a given channel.
   * Note: a node may have multiple interfaces, each of which
   * is on a different channel.
   */
    LIST_ENTRY(Phy) chnl_link_;

  /*
   * A list of all "network interfaces" for a given node.
   * Each interface is assoicated with exactly one node
   * and one channel.
   */
    LIST_ENTRY(Phy) node_link_;
    
/* ============================================================
     Physical Layer State
   ============================================================ */
    
    
    double bandwidth_;                   // bit rate
    Channel         *channel_;    // the channel for output

};


#endif // ns_phy_h

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