2 * Spanning tree protocol; timer-related code
3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
8 * $Id: br_stp_timer.c,v 1.3 2000/05/05 02:17:17 davem Exp $
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.
16 #include <linux/kernel.h>
17 #include <linux/times.h>
19 #include "br_private.h"
20 #include "br_private_stp.h"
22 /* called under bridge lock */
23 static int br_is_designated_for_some_port(const struct net_bridge
*br
)
25 struct net_bridge_port
*p
;
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))
36 static void br_hello_timer_expired(unsigned long arg
)
38 struct net_bridge
*br
= (struct net_bridge
*)arg
;
40 pr_debug("%s: hello timer expired\n", br
->dev
->name
);
42 if (br
->dev
->flags
& IFF_UP
) {
43 br_config_bpdu_generation(br
);
45 mod_timer(&br
->hello_timer
, jiffies
+ br
->hello_time
);
47 spin_unlock(&br
->lock
);
50 static void br_message_age_timer_expired(unsigned long arg
)
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
;
57 if (p
->state
== BR_STATE_DISABLED
)
61 pr_info("%s: neighbor %.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x lost on port %d(%s)\n",
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
);
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.
74 if (p
->state
== BR_STATE_DISABLED
)
76 was_root
= br_is_root_bridge(br
);
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
);
84 spin_unlock(&br
->lock
);
87 static void br_forward_delay_timer_expired(unsigned long arg
)
89 struct net_bridge_port
*p
= (struct net_bridge_port
*) arg
;
90 struct net_bridge
*br
= p
->br
;
92 pr_debug("%s: %d(%s) forward delay timer\n",
93 br
->dev
->name
, p
->port_no
, p
->dev
->name
);
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
);
105 spin_unlock(&br
->lock
);
108 static void br_tcn_timer_expired(unsigned long arg
)
110 struct net_bridge
*br
= (struct net_bridge
*) arg
;
112 pr_debug("%s: tcn timer expired\n", br
->dev
->name
);
113 spin_lock(&br
->lock
);
114 if (br
->dev
->flags
& IFF_UP
) {
117 mod_timer(&br
->tcn_timer
,jiffies
+ br
->bridge_hello_time
);
119 spin_unlock(&br
->lock
);
122 static void br_topology_change_timer_expired(unsigned long arg
)
124 struct net_bridge
*br
= (struct net_bridge
*) arg
;
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
);
133 static void br_hold_timer_expired(unsigned long arg
)
135 struct net_bridge_port
*p
= (struct net_bridge_port
*) arg
;
137 pr_debug("%s: %d(%s) hold timer expired\n",
138 p
->br
->dev
->name
, p
->port_no
, p
->dev
->name
);
140 spin_lock(&p
->br
->lock
);
141 if (p
->config_pending
)
142 br_transmit_config(p
);
143 spin_unlock(&p
->br
->lock
);
146 void br_stp_timer_init(struct net_bridge
*br
)
148 setup_timer(&br
->hello_timer
, br_hello_timer_expired
,
151 setup_timer(&br
->tcn_timer
, br_tcn_timer_expired
,
154 setup_timer(&br
->topology_change_timer
,
155 br_topology_change_timer_expired
,
158 setup_timer(&br
->gc_timer
, br_fdb_cleanup
, (unsigned long) br
);
161 void br_stp_port_timer_init(struct net_bridge_port
*p
)
163 setup_timer(&p
->message_age_timer
, br_message_age_timer_expired
,
166 setup_timer(&p
->forward_delay_timer
, br_forward_delay_timer_expired
,
169 setup_timer(&p
->hold_timer
, br_hold_timer_expired
,
173 /* Report ticks left (in USER_HZ) used for API */
174 unsigned long br_timer_value(const struct timer_list
*timer
)
176 return timer_pending(timer
)
177 ? jiffies_to_clock_t(timer
->expires
- jiffies
) : 0;