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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 |