Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / bridge / br_stp_timer.c

diff --git a/kernel/net/bridge/br_stp_timer.c b/kernel/net/bridge/br_stp_timer.c
new file mode 100644 (file)
index 0000000..7caf7fa
--- /dev/null
+++ b/kernel/net/bridge/br_stp_timer.c
@@ -0,0 +1,176 @@
+/*
+ *     Spanning tree protocol; timer-related code
+ *     Linux ethernet bridge
+ *
+ *     Authors:
+ *     Lennert Buytenhek               <buytenh@gnu.org>
+ *
+ *     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 "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;
+
+       br_debug(br, "hello timer expired\n");
+       spin_lock(&br->lock);
+       if (br->dev->flags & IFF_UP) {
+               br_config_bpdu_generation(br);
+
+               mod_timer(&br->hello_timer, round_jiffies(jiffies + br->hello_time));
+       }
+       spin_unlock(&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;
+
+       br_info(br, "port %u(%s) neighbor %.2x%.2x.%pM lost\n",
+               (unsigned int) p->port_no, p->dev->name,
+               id->prio[0], id->prio[1], &id->addr);
+
+       /*
+        * 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(&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(&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;
+
+       br_debug(br, "port %u(%s) forward delay timer\n",
+                (unsigned int) p->port_no, p->dev->name);
+       spin_lock(&br->lock);
+       if (p->state == BR_STATE_LISTENING) {
+               br_set_state(p, BR_STATE_LEARNING);
+               mod_timer(&p->forward_delay_timer,
+                         jiffies + br->forward_delay);
+       } else if (p->state == BR_STATE_LEARNING) {
+               br_set_state(p, BR_STATE_FORWARDING);
+               if (br_is_designated_for_some_port(br))
+                       br_topology_change_detection(br);
+               netif_carrier_on(br->dev);
+       }
+       br_log_state(p);
+       rcu_read_lock();
+       br_ifinfo_notify(RTM_NEWLINK, p);
+       rcu_read_unlock();
+       spin_unlock(&br->lock);
+}
+
+static void br_tcn_timer_expired(unsigned long arg)
+{
+       struct net_bridge *br = (struct net_bridge *) arg;
+
+       br_debug(br, "tcn timer expired\n");
+       spin_lock(&br->lock);
+       if (!br_is_root_bridge(br) && (br->dev->flags & IFF_UP)) {
+               br_transmit_tcn(br);
+
+               mod_timer(&br->tcn_timer, jiffies + br->bridge_hello_time);
+       }
+       spin_unlock(&br->lock);
+}
+
+static void br_topology_change_timer_expired(unsigned long arg)
+{
+       struct net_bridge *br = (struct net_bridge *) arg;
+
+       br_debug(br, "topo change timer expired\n");
+       spin_lock(&br->lock);
+       br->topology_change_detected = 0;
+       br->topology_change = 0;
+       spin_unlock(&br->lock);
+}
+
+static void br_hold_timer_expired(unsigned long arg)
+{
+       struct net_bridge_port *p = (struct net_bridge_port *) arg;
+
+       br_debug(p->br, "port %u(%s) hold timer expired\n",
+                (unsigned int) p->port_no, p->dev->name);
+
+       spin_lock(&p->br->lock);
+       if (p->config_pending)
+               br_transmit_config(p);
+       spin_unlock(&p->br->lock);
+}
+
+void br_stp_timer_init(struct net_bridge *br)
+{
+       setup_timer(&br->hello_timer, br_hello_timer_expired,
+                     (unsigned long) br);
+
+       setup_timer(&br->tcn_timer, br_tcn_timer_expired,
+                     (unsigned long) br);
+
+       setup_timer(&br->topology_change_timer,
+                     br_topology_change_timer_expired,
+                     (unsigned long) br);
+
+       setup_timer(&br->gc_timer, br_fdb_cleanup, (unsigned long) br);
+}
+
+void br_stp_port_timer_init(struct net_bridge_port *p)
+{
+       setup_timer(&p->message_age_timer, br_message_age_timer_expired,
+                     (unsigned long) p);
+
+       setup_timer(&p->forward_delay_timer, br_forward_delay_timer_expired,
+                     (unsigned long) p);
+
+       setup_timer(&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_delta_to_clock_t(timer->expires - jiffies) : 0;
+}