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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/bridge/br_stp_timer.c
downloadlinux-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
linux-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/bridge/br_stp_timer.c')
-rw-r--r--net/bridge/br_stp_timer.c188
1 files changed, 188 insertions, 0 deletions
diff --git a/net/bridge/br_stp_timer.c b/net/bridge/br_stp_timer.c
new file mode 100644
index 000000000000..9bef55f56425
--- /dev/null
+++ b/net/bridge/br_stp_timer.c
@@ -0,0 +1,188 @@
+/*
+ * Spanning tree protocol; timer-related code
+ * Linux ethernet bridge
+ *
+ * Authors:
+ * Lennert Buytenhek <buytenh@gnu.org>
+ *
+ * $Id: br_stp_timer.c,v 1.3 2000/05/05 02:17:17 davem Exp $
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/times.h>
+#include <linux/smp_lock.h>
+
+#include "br_private.h"
+#include "br_private_stp.h"
+
+/* called under bridge lock */
+static int br_is_designated_for_some_port(const struct net_bridge *br)
+{
+ struct net_bridge_port *p;
+
+ list_for_each_entry(p, &br->port_list, list) {
+ if (p->state != BR_STATE_DISABLED &&
+ !memcmp(&p->designated_bridge, &br->bridge_id, 8))
+ return 1;
+ }
+
+ return 0;
+}
+
+static void br_hello_timer_expired(unsigned long arg)
+{
+ struct net_bridge *br = (struct net_bridge *)arg;
+
+ pr_debug("%s: hello timer expired\n", br->dev->name);
+ spin_lock_bh(&br->lock);
+ if (br->dev->flags & IFF_UP) {
+ br_config_bpdu_generation(br);
+
+ mod_timer(&br->hello_timer, jiffies + br->hello_time);
+ }
+ spin_unlock_bh(&br->lock);
+}
+
+static void br_message_age_timer_expired(unsigned long arg)
+{
+ struct net_bridge_port *p = (struct net_bridge_port *) arg;
+ struct net_bridge *br = p->br;
+ const bridge_id *id = &p->designated_bridge;
+ int was_root;
+
+ if (p->state == BR_STATE_DISABLED)
+ return;
+
+
+ pr_info("%s: neighbor %.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x lost on port %d(%s)\n",
+ br->dev->name,
+ id->prio[0], id->prio[1],
+ id->addr[0], id->addr[1], id->addr[2],
+ id->addr[3], id->addr[4], id->addr[5],
+ p->port_no, p->dev->name);
+
+ /*
+ * According to the spec, the message age timer cannot be
+ * running when we are the root bridge. So.. this was_root
+ * check is redundant. I'm leaving it in for now, though.
+ */
+ spin_lock_bh(&br->lock);
+ if (p->state == BR_STATE_DISABLED)
+ goto unlock;
+ was_root = br_is_root_bridge(br);
+
+ br_become_designated_port(p);
+ br_configuration_update(br);
+ br_port_state_selection(br);
+ if (br_is_root_bridge(br) && !was_root)
+ br_become_root_bridge(br);
+ unlock:
+ spin_unlock_bh(&br->lock);
+}
+
+static void br_forward_delay_timer_expired(unsigned long arg)
+{
+ struct net_bridge_port *p = (struct net_bridge_port *) arg;
+ struct net_bridge *br = p->br;
+
+ pr_debug("%s: %d(%s) forward delay timer\n",
+ br->dev->name, p->port_no, p->dev->name);
+ spin_lock_bh(&br->lock);
+ if (p->state == BR_STATE_LISTENING) {
+ p->state = BR_STATE_LEARNING;
+ mod_timer(&p->forward_delay_timer,
+ jiffies + br->forward_delay);
+ } else if (p->state == BR_STATE_LEARNING) {
+ p->state = BR_STATE_FORWARDING;
+ if (br_is_designated_for_some_port(br))
+ br_topology_change_detection(br);
+ }
+ br_log_state(p);
+ spin_unlock_bh(&br->lock);
+}
+
+static void br_tcn_timer_expired(unsigned long arg)
+{
+ struct net_bridge *br = (struct net_bridge *) arg;
+
+ pr_debug("%s: tcn timer expired\n", br->dev->name);
+ spin_lock_bh(&br->lock);
+ if (br->dev->flags & IFF_UP) {
+ br_transmit_tcn(br);
+
+ mod_timer(&br->tcn_timer,jiffies + br->bridge_hello_time);
+ }
+ spin_unlock_bh(&br->lock);
+}
+
+static void br_topology_change_timer_expired(unsigned long arg)
+{
+ struct net_bridge *br = (struct net_bridge *) arg;
+
+ pr_debug("%s: topo change timer expired\n", br->dev->name);
+ spin_lock_bh(&br->lock);
+ br->topology_change_detected = 0;
+ br->topology_change = 0;
+ spin_unlock_bh(&br->lock);
+}
+
+static void br_hold_timer_expired(unsigned long arg)
+{
+ struct net_bridge_port *p = (struct net_bridge_port *) arg;
+
+ pr_debug("%s: %d(%s) hold timer expired\n",
+ p->br->dev->name, p->port_no, p->dev->name);
+
+ spin_lock_bh(&p->br->lock);
+ if (p->config_pending)
+ br_transmit_config(p);
+ spin_unlock_bh(&p->br->lock);
+}
+
+static inline void br_timer_init(struct timer_list *timer,
+ void (*_function)(unsigned long),
+ unsigned long _data)
+{
+ init_timer(timer);
+ timer->function = _function;
+ timer->data = _data;
+}
+
+void br_stp_timer_init(struct net_bridge *br)
+{
+ br_timer_init(&br->hello_timer, br_hello_timer_expired,
+ (unsigned long) br);
+
+ br_timer_init(&br->tcn_timer, br_tcn_timer_expired,
+ (unsigned long) br);
+
+ br_timer_init(&br->topology_change_timer,
+ br_topology_change_timer_expired,
+ (unsigned long) br);
+
+ br_timer_init(&br->gc_timer, br_fdb_cleanup, (unsigned long) br);
+}
+
+void br_stp_port_timer_init(struct net_bridge_port *p)
+{
+ br_timer_init(&p->message_age_timer, br_message_age_timer_expired,
+ (unsigned long) p);
+
+ br_timer_init(&p->forward_delay_timer, br_forward_delay_timer_expired,
+ (unsigned long) p);
+
+ br_timer_init(&p->hold_timer, br_hold_timer_expired,
+ (unsigned long) p);
+}
+
+/* Report ticks left (in USER_HZ) used for API */
+unsigned long br_timer_value(const struct timer_list *timer)
+{
+ return timer_pending(timer)
+ ? jiffies_to_clock_t(timer->expires - jiffies) : 0;
+}