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