Convert bonding timers to workqueues

	Convert bonding timers to workqueues.  This converts the various
monitor functions to run in periodic work queues instead of timers.  This
patch introduces the framework and convers the calls, but does not resolve
various locking issues, and does not stand alone.

Signed-off-by: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 79 insertions, 68 deletions

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 6f85cc31f8a2..ed361d62d702 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2089,9 +2089,10 @@ static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *in
 /*-------------------------------- Monitoring -------------------------------*/
 
 /* this function is called regularly to monitor each slave's link. */
-void bond_mii_monitor(struct net_device *bond_dev)
+void bond_mii_monitor(struct work_struct *work)
 {
-	struct bonding *bond = bond_dev->priv;
+	struct bonding *bond = container_of(work, struct bonding,
+					    mii_work.work);
 	struct slave *slave, *oldcurrent;
 	int do_failover = 0;
 	int delta_in_ticks;
@@ -2156,7 +2157,7 @@ void bond_mii_monitor(struct net_device *bond_dev)
 					       ": %s: link status down for %s "
 					       "interface %s, disabling it in "
 					       "%d ms.\n",
-					       bond_dev->name,
+					       bond->dev->name,
 					       IS_UP(slave_dev)
 					       ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
 						  ? ((slave == oldcurrent)
@@ -2189,7 +2190,7 @@ void bond_mii_monitor(struct net_device *bond_dev)
 					       ": %s: link status definitely "
 					       "down for interface %s, "
 					       "disabling it\n",
-					       bond_dev->name,
+					       bond->dev->name,
 					       slave_dev->name);
 
 					/* notify ad that the link status has changed */
@@ -2215,7 +2216,7 @@ void bond_mii_monitor(struct net_device *bond_dev)
 				printk(KERN_INFO DRV_NAME
 				       ": %s: link status up again after %d "
 				       "ms for interface %s.\n",
-				       bond_dev->name,
+				       bond->dev->name,
 				       (bond->params.downdelay - slave->delay) * bond->params.miimon,
 				       slave_dev->name);
 			}
@@ -2235,7 +2236,7 @@ void bond_mii_monitor(struct net_device *bond_dev)
 					       ": %s: link status up for "
 					       "interface %s, enabling it "
 					       "in %d ms.\n",
-					       bond_dev->name,
+					       bond->dev->name,
 					       slave_dev->name,
 					       bond->params.updelay * bond->params.miimon);
 				}
@@ -2251,7 +2252,7 @@ void bond_mii_monitor(struct net_device *bond_dev)
 				printk(KERN_INFO DRV_NAME
 				       ": %s: link status down again after %d "
 				       "ms for interface %s.\n",
-				       bond_dev->name,
+				       bond->dev->name,
 				       (bond->params.updelay - slave->delay) * bond->params.miimon,
 				       slave_dev->name);
 			} else {
@@ -2275,7 +2276,7 @@ void bond_mii_monitor(struct net_device *bond_dev)
 					printk(KERN_INFO DRV_NAME
 					       ": %s: link status definitely "
 					       "up for interface %s.\n",
-					       bond_dev->name,
+					       bond->dev->name,
 					       slave_dev->name);
 
 					/* notify ad that the link status has changed */
@@ -2301,7 +2302,7 @@ void bond_mii_monitor(struct net_device *bond_dev)
 			/* Should not happen */
 			printk(KERN_ERR DRV_NAME
 			       ": %s: Error: %s Illegal value (link=%d)\n",
-			       bond_dev->name,
+			       bond->dev->name,
 			       slave->dev->name,
 			       slave->link);
 			goto out;
@@ -2331,9 +2332,8 @@ void bond_mii_monitor(struct net_device *bond_dev)
 		bond_set_carrier(bond);
 
 re_arm:
-	if (bond->params.miimon) {
-		mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
-	}
+	if (bond->params.miimon)
+		queue_delayed_work(bond->wq, &bond->mii_work, delta_in_ticks);
 out:
 	read_unlock(&bond->lock);
 }
@@ -2636,9 +2636,10 @@ out:
  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
  * arp monitoring in active backup mode.
  */
-void bond_loadbalance_arp_mon(struct net_device *bond_dev)
+void bond_loadbalance_arp_mon(struct work_struct *work)
 {
-	struct bonding *bond = bond_dev->priv;
+	struct bonding *bond = container_of(work, struct bonding,
+					    arp_work.work);
 	struct slave *slave, *oldcurrent;
 	int do_failover = 0;
 	int delta_in_ticks;
@@ -2685,13 +2686,13 @@ void bond_loadbalance_arp_mon(struct net_device *bond_dev)
 					printk(KERN_INFO DRV_NAME
 					       ": %s: link status definitely "
 					       "up for interface %s, ",
-					       bond_dev->name,
+					       bond->dev->name,
 					       slave->dev->name);
 					do_failover = 1;
 				} else {
 					printk(KERN_INFO DRV_NAME
 					       ": %s: interface %s is now up\n",
-					       bond_dev->name,
+					       bond->dev->name,
 					       slave->dev->name);
 				}
 			}
@@ -2715,7 +2716,7 @@ void bond_loadbalance_arp_mon(struct net_device *bond_dev)
 
 				printk(KERN_INFO DRV_NAME
 				       ": %s: interface %s is now down.\n",
-				       bond_dev->name,
+				       bond->dev->name,
 				       slave->dev->name);
 
 				if (slave == oldcurrent) {
@@ -2745,9 +2746,8 @@ void bond_loadbalance_arp_mon(struct net_device *bond_dev)
 	}
 
 re_arm:
-	if (bond->params.arp_interval) {
-		mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
-	}
+	if (bond->params.arp_interval)
+		queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
 out:
 	read_unlock(&bond->lock);
 }
@@ -2767,9 +2767,10 @@ out:
  * may have received.
  * see loadbalance_arp_monitor for arp monitoring in load balancing mode
  */
-void bond_activebackup_arp_mon(struct net_device *bond_dev)
+void bond_activebackup_arp_mon(struct work_struct *work)
 {
-	struct bonding *bond = bond_dev->priv;
+	struct bonding *bond = container_of(work, struct bonding,
+					    arp_work.work);
 	struct slave *slave;
 	int delta_in_ticks;
 	int i;
@@ -2821,14 +2822,14 @@ void bond_activebackup_arp_mon(struct net_device *bond_dev)
 					printk(KERN_INFO DRV_NAME
 					       ": %s: %s is up and now the "
 					       "active interface\n",
-					       bond_dev->name,
+					       bond->dev->name,
 					       slave->dev->name);
 					netif_carrier_on(bond->dev);
 				} else {
 					printk(KERN_INFO DRV_NAME
 					       ": %s: backup interface %s is "
 					       "now up\n",
-					       bond_dev->name,
+					       bond->dev->name,
 					       slave->dev->name);
 				}
 
@@ -2864,7 +2865,7 @@ void bond_activebackup_arp_mon(struct net_device *bond_dev)
 
 				printk(KERN_INFO DRV_NAME
 				       ": %s: backup interface %s is now down\n",
-				       bond_dev->name,
+				       bond->dev->name,
 				       slave->dev->name);
 			} else {
 				read_unlock(&bond->curr_slave_lock);
@@ -2899,7 +2900,7 @@ void bond_activebackup_arp_mon(struct net_device *bond_dev)
 			printk(KERN_INFO DRV_NAME
 			       ": %s: link status down for active interface "
 			       "%s, disabling it\n",
-			       bond_dev->name,
+			       bond->dev->name,
 			       slave->dev->name);
 
 			write_lock(&bond->curr_slave_lock);
@@ -2921,7 +2922,7 @@ void bond_activebackup_arp_mon(struct net_device *bond_dev)
 			printk(KERN_INFO DRV_NAME
 			       ": %s: changing from interface %s to primary "
 			       "interface %s\n",
-			       bond_dev->name,
+			       bond->dev->name,
 			       slave->dev->name,
 			       bond->primary_slave->dev->name);
 
@@ -2985,7 +2986,7 @@ void bond_activebackup_arp_mon(struct net_device *bond_dev)
 					printk(KERN_INFO DRV_NAME
 					       ": %s: backup interface %s is "
 					       "now down.\n",
-					       bond_dev->name,
+					       bond->dev->name,
 					       slave->dev->name);
 				}
 			}
@@ -2994,7 +2995,7 @@ void bond_activebackup_arp_mon(struct net_device *bond_dev)
 
 re_arm:
 	if (bond->params.arp_interval) {
-		mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
+		queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
 	}
 out:
 	read_unlock(&bond->lock);
@@ -3582,15 +3583,11 @@ static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
 static int bond_open(struct net_device *bond_dev)
 {
 	struct bonding *bond = bond_dev->priv;
-	struct timer_list *mii_timer = &bond->mii_timer;
-	struct timer_list *arp_timer = &bond->arp_timer;
 
 	bond->kill_timers = 0;
 
 	if ((bond->params.mode == BOND_MODE_TLB) ||
 	    (bond->params.mode == BOND_MODE_ALB)) {
-		struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
-
 		/* bond_alb_initialize must be called before the timer
 		 * is started.
 		 */
@@ -3599,44 +3596,31 @@ static int bond_open(struct net_device *bond_dev)
 			return -1;
 		}
 
-		init_timer(alb_timer);
-		alb_timer->expires  = jiffies + 1;
-		alb_timer->data     = (unsigned long)bond;
-		alb_timer->function = (void *)&bond_alb_monitor;
-		add_timer(alb_timer);
+		INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
+		queue_delayed_work(bond->wq, &bond->alb_work, 0);
 	}
 
 	if (bond->params.miimon) {  /* link check interval, in milliseconds. */
-		init_timer(mii_timer);
-		mii_timer->expires  = jiffies + 1;
-		mii_timer->data     = (unsigned long)bond_dev;
-		mii_timer->function = (void *)&bond_mii_monitor;
-		add_timer(mii_timer);
+		INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
+		queue_delayed_work(bond->wq, &bond->mii_work, 0);
 	}
 
 	if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
-		init_timer(arp_timer);
-		arp_timer->expires  = jiffies + 1;
-		arp_timer->data     = (unsigned long)bond_dev;
-		if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
-			arp_timer->function = (void *)&bond_activebackup_arp_mon;
-		} else {
-			arp_timer->function = (void *)&bond_loadbalance_arp_mon;
-		}
+		if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
+			INIT_DELAYED_WORK(&bond->arp_work,
+					  bond_activebackup_arp_mon);
+		else
+			INIT_DELAYED_WORK(&bond->arp_work,
+					  bond_loadbalance_arp_mon);
+
+		queue_delayed_work(bond->wq, &bond->arp_work, 0);
 		if (bond->params.arp_validate)
 			bond_register_arp(bond);
-
-		add_timer(arp_timer);
 	}
 
 	if (bond->params.mode == BOND_MODE_8023AD) {
-		struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
-		init_timer(ad_timer);
-		ad_timer->expires  = jiffies + 1;
-		ad_timer->data     = (unsigned long)bond;
-		ad_timer->function = (void *)&bond_3ad_state_machine_handler;
-		add_timer(ad_timer);
-
+		INIT_DELAYED_WORK(&bond->ad_work, bond_alb_monitor);
+		queue_delayed_work(bond->wq, &bond->ad_work, 0);
 		/* register to receive LACPDUs */
 		bond_register_lacpdu(bond);
 	}
@@ -3664,25 +3648,21 @@ static int bond_close(struct net_device *bond_dev)
 
 	write_unlock_bh(&bond->lock);
 
-	/* del_timer_sync must run without holding the bond->lock
-	 * because a running timer might be trying to hold it too
-	 */
-
 	if (bond->params.miimon) {  /* link check interval, in milliseconds. */
-		del_timer_sync(&bond->mii_timer);
+		cancel_delayed_work(&bond->mii_work);
 	}
 
 	if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
-		del_timer_sync(&bond->arp_timer);
+		cancel_delayed_work(&bond->arp_work);
 	}
 
 	switch (bond->params.mode) {
 	case BOND_MODE_8023AD:
-		del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
+		cancel_delayed_work(&bond->ad_work);
 		break;
 	case BOND_MODE_TLB:
 	case BOND_MODE_ALB:
-		del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
+		cancel_delayed_work(&bond->alb_work);
 		break;
 	default:
 		break;
@@ -4340,6 +4320,10 @@ static int bond_init(struct net_device *bond_dev, struct bond_params *params)
 
 	bond->params = *params; /* copy params struct */
 
+	bond->wq = create_singlethread_workqueue(bond_dev->name);
+	if (!bond->wq)
+		return -ENOMEM;
+
 	/* Initialize pointers */
 	bond->first_slave = NULL;
 	bond->curr_active_slave = NULL;
@@ -4826,10 +4810,32 @@ out_rtnl:
 	return res;
 }
 
+static void bond_work_cancel_all(struct bonding *bond)
+{
+	write_lock_bh(&bond->lock);
+	bond->kill_timers = 1;
+	write_unlock_bh(&bond->lock);
+
+	if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
+		cancel_delayed_work(&bond->mii_work);
+
+	if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
+		cancel_delayed_work(&bond->arp_work);
+
+	if (bond->params.mode == BOND_MODE_ALB &&
+	    delayed_work_pending(&bond->alb_work))
+		cancel_delayed_work(&bond->alb_work);
+
+	if (bond->params.mode == BOND_MODE_8023AD &&
+	    delayed_work_pending(&bond->ad_work))
+		cancel_delayed_work(&bond->ad_work);
+}
+
 static int __init bonding_init(void)
 {
 	int i;
 	int res;
+	struct bonding *bond, *nxt;
 
 	printk(KERN_INFO "%s", version);
 
@@ -4856,6 +4862,11 @@ static int __init bonding_init(void)
 
 	goto out;
 err:
+	list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
+		bond_work_cancel_all(bond);
+		destroy_workqueue(bond->wq);
+	}
+
 	rtnl_lock();
 	bond_free_all();
 	bond_destroy_sysfs();