[BRIDGE]: use kcalloc
[linux-2.6.git] / 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 #include <linux/smp_lock.h>
19
20 #include "br_private.h"
21 #include "br_private_stp.h"
22
23 /* called under bridge lock */
24 static int br_is_designated_for_some_port(const struct net_bridge *br)
25 {
26         struct net_bridge_port *p;
27
28         list_for_each_entry(p, &br->port_list, list) {
29                 if (p->state != BR_STATE_DISABLED &&
30                     !memcmp(&p->designated_bridge, &br->bridge_id, 8)) 
31                         return 1;
32         }
33
34         return 0;
35 }
36
37 static void br_hello_timer_expired(unsigned long arg)
38 {
39         struct net_bridge *br = (struct net_bridge *)arg;
40         
41         pr_debug("%s: hello timer expired\n", br->dev->name);
42         spin_lock(&br->lock);
43         if (br->dev->flags & IFF_UP) {
44                 br_config_bpdu_generation(br);
45
46                 mod_timer(&br->hello_timer, jiffies + br->hello_time);
47         }
48         spin_unlock(&br->lock);
49 }
50
51 static void br_message_age_timer_expired(unsigned long arg)
52 {
53         struct net_bridge_port *p = (struct net_bridge_port *) arg;
54         struct net_bridge *br = p->br;
55         const bridge_id *id = &p->designated_bridge;
56         int was_root;
57
58         if (p->state == BR_STATE_DISABLED)
59                 return;
60
61         
62         pr_info("%s: neighbor %.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x lost on port %d(%s)\n",
63                 br->dev->name, 
64                 id->prio[0], id->prio[1], 
65                 id->addr[0], id->addr[1], id->addr[2], 
66                 id->addr[3], id->addr[4], id->addr[5],
67                 p->port_no, p->dev->name);
68
69         /*
70          * According to the spec, the message age timer cannot be
71          * running when we are the root bridge. So..  this was_root
72          * check is redundant. I'm leaving it in for now, though.
73          */
74         spin_lock(&br->lock);
75         if (p->state == BR_STATE_DISABLED)
76                 goto unlock;
77         was_root = br_is_root_bridge(br);
78
79         br_become_designated_port(p);
80         br_configuration_update(br);
81         br_port_state_selection(br);
82         if (br_is_root_bridge(br) && !was_root)
83                 br_become_root_bridge(br);
84  unlock:
85         spin_unlock(&br->lock);
86 }
87
88 static void br_forward_delay_timer_expired(unsigned long arg)
89 {
90         struct net_bridge_port *p = (struct net_bridge_port *) arg;
91         struct net_bridge *br = p->br;
92
93         pr_debug("%s: %d(%s) forward delay timer\n",
94                  br->dev->name, p->port_no, p->dev->name);
95         spin_lock(&br->lock);
96         if (p->state == BR_STATE_LISTENING) {
97                 p->state = BR_STATE_LEARNING;
98                 mod_timer(&p->forward_delay_timer,
99                           jiffies + br->forward_delay);
100         } else if (p->state == BR_STATE_LEARNING) {
101                 p->state = BR_STATE_FORWARDING;
102                 if (br_is_designated_for_some_port(br))
103                         br_topology_change_detection(br);
104         }
105         br_log_state(p);
106         spin_unlock(&br->lock);
107 }
108
109 static void br_tcn_timer_expired(unsigned long arg)
110 {
111         struct net_bridge *br = (struct net_bridge *) arg;
112
113         pr_debug("%s: tcn timer expired\n", br->dev->name);
114         spin_lock(&br->lock);
115         if (br->dev->flags & IFF_UP) {
116                 br_transmit_tcn(br);
117         
118                 mod_timer(&br->tcn_timer,jiffies + br->bridge_hello_time);
119         }
120         spin_unlock(&br->lock);
121 }
122
123 static void br_topology_change_timer_expired(unsigned long arg)
124 {
125         struct net_bridge *br = (struct net_bridge *) arg;
126
127         pr_debug("%s: topo change timer expired\n", br->dev->name);
128         spin_lock(&br->lock);
129         br->topology_change_detected = 0;
130         br->topology_change = 0;
131         spin_unlock(&br->lock);
132 }
133
134 static void br_hold_timer_expired(unsigned long arg)
135 {
136         struct net_bridge_port *p = (struct net_bridge_port *) arg;
137
138         pr_debug("%s: %d(%s) hold timer expired\n", 
139                  p->br->dev->name,  p->port_no, p->dev->name);
140
141         spin_lock(&p->br->lock);
142         if (p->config_pending)
143                 br_transmit_config(p);
144         spin_unlock(&p->br->lock);
145 }
146
147 void br_stp_timer_init(struct net_bridge *br)
148 {
149         setup_timer(&br->hello_timer, br_hello_timer_expired,
150                       (unsigned long) br);
151
152         setup_timer(&br->tcn_timer, br_tcn_timer_expired,
153                       (unsigned long) br);
154
155         setup_timer(&br->topology_change_timer,
156                       br_topology_change_timer_expired,
157                       (unsigned long) br);
158
159         setup_timer(&br->gc_timer, br_fdb_cleanup, (unsigned long) br);
160 }
161
162 void br_stp_port_timer_init(struct net_bridge_port *p)
163 {
164         setup_timer(&p->message_age_timer, br_message_age_timer_expired,
165                       (unsigned long) p);
166
167         setup_timer(&p->forward_delay_timer, br_forward_delay_timer_expired,
168                       (unsigned long) p);
169                       
170         setup_timer(&p->hold_timer, br_hold_timer_expired,
171                       (unsigned long) p);
172 }       
173
174 /* Report ticks left (in USER_HZ) used for API */
175 unsigned long br_timer_value(const struct timer_list *timer)
176 {
177         return timer_pending(timer)
178                 ? jiffies_to_clock_t(timer->expires - jiffies) : 0;
179 }