Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6
[linux-2.6] / net / bridge / br_stp_timer.c
1 /*
2  *      Spanning tree protocol; timer-related code
3  *      Linux ethernet bridge
4  *
5  *      Authors:
6  *      Lennert Buytenhek               <buytenh@gnu.org>
7  *
8  *      $Id: br_stp_timer.c,v 1.3 2000/05/05 02:17:17 davem Exp $
9  *
10  *      This program is free software; you can redistribute it and/or
11  *      modify it under the terms of the GNU General Public License
12  *      as published by the Free Software Foundation; either version
13  *      2 of the License, or (at your option) any later version.
14  */
15
16 #include <linux/kernel.h>
17 #include <linux/times.h>
18
19 #include "br_private.h"
20 #include "br_private_stp.h"
21
22 /* called under bridge lock */
23 static int br_is_designated_for_some_port(const struct net_bridge *br)
24 {
25         struct net_bridge_port *p;
26
27         list_for_each_entry(p, &br->port_list, list) {
28                 if (p->state != BR_STATE_DISABLED &&
29                     !memcmp(&p->designated_bridge, &br->bridge_id, 8))
30                         return 1;
31         }
32
33         return 0;
34 }
35
36 static void br_hello_timer_expired(unsigned long arg)
37 {
38         struct net_bridge *br = (struct net_bridge *)arg;
39
40         pr_debug("%s: hello timer expired\n", br->dev->name);
41         spin_lock(&br->lock);
42         if (br->dev->flags & IFF_UP) {
43                 br_config_bpdu_generation(br);
44
45                 mod_timer(&br->hello_timer, round_jiffies(jiffies + br->hello_time));
46         }
47         spin_unlock(&br->lock);
48 }
49
50 static void br_message_age_timer_expired(unsigned long arg)
51 {
52         struct net_bridge_port *p = (struct net_bridge_port *) arg;
53         struct net_bridge *br = p->br;
54         const bridge_id *id = &p->designated_bridge;
55         int was_root;
56
57         if (p->state == BR_STATE_DISABLED)
58                 return;
59
60
61         pr_info("%s: neighbor %.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x lost on port %d(%s)\n",
62                 br->dev->name,
63                 id->prio[0], id->prio[1],
64                 id->addr[0], id->addr[1], id->addr[2],
65                 id->addr[3], id->addr[4], id->addr[5],
66                 p->port_no, p->dev->name);
67
68         /*
69          * According to the spec, the message age timer cannot be
70          * running when we are the root bridge. So..  this was_root
71          * check is redundant. I'm leaving it in for now, though.
72          */
73         spin_lock(&br->lock);
74         if (p->state == BR_STATE_DISABLED)
75                 goto unlock;
76         was_root = br_is_root_bridge(br);
77
78         br_become_designated_port(p);
79         br_configuration_update(br);
80         br_port_state_selection(br);
81         if (br_is_root_bridge(br) && !was_root)
82                 br_become_root_bridge(br);
83  unlock:
84         spin_unlock(&br->lock);
85 }
86
87 static void br_forward_delay_timer_expired(unsigned long arg)
88 {
89         struct net_bridge_port *p = (struct net_bridge_port *) arg;
90         struct net_bridge *br = p->br;
91
92         pr_debug("%s: %d(%s) forward delay timer\n",
93                  br->dev->name, p->port_no, p->dev->name);
94         spin_lock(&br->lock);
95         if (p->state == BR_STATE_LISTENING) {
96                 p->state = BR_STATE_LEARNING;
97                 mod_timer(&p->forward_delay_timer,
98                           jiffies + br->forward_delay);
99         } else if (p->state == BR_STATE_LEARNING) {
100                 p->state = BR_STATE_FORWARDING;
101                 if (br_is_designated_for_some_port(br))
102                         br_topology_change_detection(br);
103         }
104         br_log_state(p);
105         spin_unlock(&br->lock);
106 }
107
108 static void br_tcn_timer_expired(unsigned long arg)
109 {
110         struct net_bridge *br = (struct net_bridge *) arg;
111
112         pr_debug("%s: tcn timer expired\n", br->dev->name);
113         spin_lock(&br->lock);
114         if (br->dev->flags & IFF_UP) {
115                 br_transmit_tcn(br);
116
117                 mod_timer(&br->tcn_timer,jiffies + br->bridge_hello_time);
118         }
119         spin_unlock(&br->lock);
120 }
121
122 static void br_topology_change_timer_expired(unsigned long arg)
123 {
124         struct net_bridge *br = (struct net_bridge *) arg;
125
126         pr_debug("%s: topo change timer expired\n", br->dev->name);
127         spin_lock(&br->lock);
128         br->topology_change_detected = 0;
129         br->topology_change = 0;
130         spin_unlock(&br->lock);
131 }
132
133 static void br_hold_timer_expired(unsigned long arg)
134 {
135         struct net_bridge_port *p = (struct net_bridge_port *) arg;
136
137         pr_debug("%s: %d(%s) hold timer expired\n",
138                  p->br->dev->name,  p->port_no, p->dev->name);
139
140         spin_lock(&p->br->lock);
141         if (p->config_pending)
142                 br_transmit_config(p);
143         spin_unlock(&p->br->lock);
144 }
145
146 void br_stp_timer_init(struct net_bridge *br)
147 {
148         setup_timer(&br->hello_timer, br_hello_timer_expired,
149                       (unsigned long) br);
150
151         setup_timer(&br->tcn_timer, br_tcn_timer_expired,
152                       (unsigned long) br);
153
154         setup_timer(&br->topology_change_timer,
155                       br_topology_change_timer_expired,
156                       (unsigned long) br);
157
158         setup_timer(&br->gc_timer, br_fdb_cleanup, (unsigned long) br);
159 }
160
161 void br_stp_port_timer_init(struct net_bridge_port *p)
162 {
163         setup_timer(&p->message_age_timer, br_message_age_timer_expired,
164                       (unsigned long) p);
165
166         setup_timer(&p->forward_delay_timer, br_forward_delay_timer_expired,
167                       (unsigned long) p);
168
169         setup_timer(&p->hold_timer, br_hold_timer_expired,
170                       (unsigned long) p);
171 }
172
173 /* Report ticks left (in USER_HZ) used for API */
174 unsigned long br_timer_value(const struct timer_list *timer)
175 {
176         return timer_pending(timer)
177                 ? jiffies_to_clock_t(timer->expires - jiffies) : 0;
178 }