usr/src/lib/librstp/common/p2p.c

   1 /************************************************************************
   2  * RSTP library - Rapid Spanning Tree (802.1t, 802.1w)
   3  * Copyright (C) 2001-2003 Optical Access
   4  * Author: Alex Rozin
   5  *
   6  * This file is part of RSTP library.
   7  *
   8  * RSTP library is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by the
  10  * Free Software Foundation; version 2.1
  11  *
  12  * RSTP library is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public License
  18  * along with RSTP library; see the file COPYING.  If not, write to the Free
  19  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20  * 02111-1307, USA.
  21  **********************************************************************/
  22
  23 /* Point To Point MAC mode selection machine : 6.4.3, 6.5.1 */
  24
  25 #include "base.h"
  26 #include "stpm.h"
  27 #include "stp_to.h" /* for STP_OUT_get_duplex */
  28
  29 #define STATES { \
  30   CHOOSE(INIT),     \
  31   CHOOSE(RECOMPUTE),    \
  32   CHOOSE(STABLE)    \
  33 }
  34
  35 #define GET_STATE_NAME STP_p2p_get_state_name
  36 #include "choose.h"
  37
  38 static Bool
  39 computeP2P (PORT_T *port)
  40 {
  41     switch (port->adminPointToPointMac) {
  42       case P2P_FORCE_TRUE:
  43         return True;
  44       case P2P_FORCE_FALSE:
  45         return False;
  46       default:
  47       case P2P_AUTO:
  48         return STP_OUT_get_duplex (port->port_index);
  49     }
  50 }
  51
  52 void
  53 STP_p2p_enter_state (STATE_MACH_T* s)
  54 {
  55   register PORT_T* port = s->owner.port;
  56
  57   switch (s->State) {
  58     case BEGIN:
  59     case INIT:
  60       port->p2p_recompute = True;
  61       break;
  62     case RECOMPUTE:
  63       port->operPointToPointMac = computeP2P (port);
  64       port->p2p_recompute = False;
  65       break;
  66     case STABLE:
  67       break;
  68   }
  69 }
  70
  71 Bool
  72 STP_p2p_check_conditions (STATE_MACH_T* s)
  73 {
  74   register PORT_T* port = s->owner.port;
  75
  76   switch (s->State) {
  77     case BEGIN:
  78     case INIT:
  79       return STP_hop_2_state (s, STABLE);
  80     case RECOMPUTE:
  81       return STP_hop_2_state (s, STABLE);
  82     case STABLE:
  83       if (port->p2p_recompute) {
  84         return STP_hop_2_state (s, RECOMPUTE);
  85       }
  86       break;
  87   }
  88   return False;
  89 }
  90