Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization"
[pv_ops_mirror.git] / net / bridge / br_stp_timer.c
blob24e0ca4a3131948af3cf2d59c956ccf9f852fc96
1 /*
2 * Spanning tree protocol; timer-related code
3 * Linux ethernet bridge
5 * Authors:
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))
30 return 1;
33 return 0;
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);
41 spin_lock(&br->lock);
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;
55 int was_root;
57 if (p->state == BR_STATE_DISABLED)
58 return;
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);
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.
73 spin_lock(&br->lock);
74 if (p->state == BR_STATE_DISABLED)
75 goto unlock;
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);
83 unlock:
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);
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);
104 br_log_state(p);
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) {
115 br_transmit_tcn(br);
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,
149 (unsigned long) br);
151 setup_timer(&br->tcn_timer, br_tcn_timer_expired,
152 (unsigned long) br);
154 setup_timer(&br->topology_change_timer,
155 br_topology_change_timer_expired,
156 (unsigned long) br);
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,
164 (unsigned long) p);
166 setup_timer(&p->forward_delay_timer, br_forward_delay_timer_expired,
167 (unsigned long) p);
169 setup_timer(&p->hold_timer, br_hold_timer_expired,
170 (unsigned long) p);
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;