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
computeP2P(PORT_T * port)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
STP_p2p_enter_state(STATE_MACH_T * s)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
STP_p2p_check_conditions(STATE_MACH_T * s)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
91