[PATCH] bonding: support carrier state for master

	Add support for the bonding master to specify its carrier state
based upon the state of the slaves.  For 802.3ad, the bond is up if
there is an active, parterned aggregator.  For other modes, the bond is
up if any slaves are up.  Updates driver version to 3.0.3.

	Based on a patch by jamal <hadi@cyberus.ca>.

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

4 files changed, 102 insertions, 28 deletions

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index f3f5825469d..6a407070c2e 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -2294,6 +2294,34 @@ void bond_3ad_handle_link_change(struct slave *slave, char link)
 	port->sm_vars |= AD_PORT_BEGIN;
 }
 
+/*
+ * set link state for bonding master: if we have an active partnered
+ * aggregator, we're up, if not, we're down.  Presumes that we cannot
+ * have an active aggregator if there are no slaves with link up.
+ *
+ * Called by bond_set_carrier(). Return zero if carrier state does not
+ * change, nonzero if it does.
+ */
+int bond_3ad_set_carrier(struct bonding *bond)
+{
+	struct aggregator *agg;
+
+	agg = __get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator));
+	if (agg && MAC_ADDRESS_COMPARE(&agg->partner_system, &null_mac_addr)) {
+		if (!netif_carrier_ok(bond->dev)) {
+			netif_carrier_on(bond->dev);
+			return 1;
+		}
+		return 0;
+	}
+
+	if (netif_carrier_ok(bond->dev)) {
+		netif_carrier_off(bond->dev);
+		return 1;
+	}
+	return 0;
+}
+
 /**
  * bond_3ad_get_active_agg_info - get information of the active aggregator
  * @bond: bonding struct to work on
diff --git a/drivers/net/bonding/bond_3ad.h b/drivers/net/bonding/bond_3ad.h
index 5ee2cef5b03..6ad5ad6e65d 100644
--- a/drivers/net/bonding/bond_3ad.h
+++ b/drivers/net/bonding/bond_3ad.h
@@ -283,5 +283,6 @@ void bond_3ad_handle_link_change(struct slave *slave, char link);
 int  bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info);
 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev);
 int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type* ptype, struct net_device *orig_dev);
+int bond_3ad_set_carrier(struct bonding *bond);
 #endif //__BOND_3AD_H__
 
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index f13a539dc16..55d236726d1 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -559,6 +559,42 @@ out:
 /*------------------------------- Link status -------------------------------*/
 
 /*
+ * Set the carrier state for the master according to the state of its
+ * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
+ * do special 802.3ad magic.
+ *
+ * Returns zero if carrier state does not change, nonzero if it does.
+ */
+static int bond_set_carrier(struct bonding *bond)
+{
+	struct slave *slave;
+	int i;
+
+	if (bond->slave_cnt == 0)
+		goto down;
+
+	if (bond->params.mode == BOND_MODE_8023AD)
+		return bond_3ad_set_carrier(bond);
+
+	bond_for_each_slave(bond, slave, i) {
+		if (slave->link == BOND_LINK_UP) {
+			if (!netif_carrier_ok(bond->dev)) {
+				netif_carrier_on(bond->dev);
+				return 1;
+			}
+			return 0;
+		}
+	}
+
+down:
+	if (netif_carrier_ok(bond->dev)) {
+		netif_carrier_off(bond->dev);
+		return 1;
+	}
+	return 0;
+}
+
+/*
  * Get link speed and duplex from the slave's base driver
  * using ethtool. If for some reason the call fails or the
  * values are invalid, fake speed and duplex to 100/Full
@@ -1074,10 +1110,24 @@ void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 void bond_select_active_slave(struct bonding *bond)
 {
 	struct slave *best_slave;
+	int rv;
 
 	best_slave = bond_find_best_slave(bond);
 	if (best_slave != bond->curr_active_slave) {
 		bond_change_active_slave(bond, best_slave);
+		rv = bond_set_carrier(bond);
+		if (!rv)
+			return;
+
+		if (netif_carrier_ok(bond->dev)) {
+			printk(KERN_INFO DRV_NAME
+			       ": %s: first active interface up!\n",
+			       bond->dev->name);
+		} else {
+			printk(KERN_INFO DRV_NAME ": %s: "
+			       "now running without any active interface !\n",
+			       bond->dev->name);
+		}
 	}
 }
 
@@ -1458,10 +1508,14 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 		if (((!bond->curr_active_slave) ||
 		     (bond->curr_active_slave->dev->priv_flags & IFF_SLAVE_INACTIVE)) &&
 		    (new_slave->link != BOND_LINK_DOWN)) {
-			dprintk("This is the first active slave\n");
 			/* first slave or no active slave yet, and this link
 			   is OK, so make this interface the active one */
 			bond_change_active_slave(bond, new_slave);
+			printk(KERN_INFO DRV_NAME
+			       ": %s: first active interface up!\n",
+			       bond->dev->name);
+			netif_carrier_on(bond->dev);
+
 		} else {
 			dprintk("This is just a backup slave\n");
 			bond_set_slave_inactive_flags(new_slave);
@@ -1517,6 +1571,8 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 		break;
 	} /* switch(bond_mode) */
 
+	bond_set_carrier(bond);
+
 	write_unlock_bh(&bond->lock);
 
 	res = bond_create_slave_symlinks(bond_dev, slave_dev);
@@ -1656,18 +1712,12 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
 		bond_alb_deinit_slave(bond, slave);
 	}
 
-	if (oldcurrent == slave) {
+	if (oldcurrent == slave)
 		bond_select_active_slave(bond);
 
-		if (!bond->curr_active_slave) {
-			printk(KERN_INFO DRV_NAME
-			       ": %s: now running without any active "
-			       "interface !\n",
-			       bond_dev->name);
-		}
-	}
-
 	if (bond->slave_cnt == 0) {
+		bond_set_carrier(bond);
+
 		/* if the last slave was removed, zero the mac address
 		 * of the master so it will be set by the application
 		 * to the mac address of the first slave
@@ -1751,6 +1801,8 @@ static int bond_release_all(struct net_device *bond_dev)
 
 	write_lock_bh(&bond->lock);
 
+	netif_carrier_off(bond_dev);
+
 	if (bond->slave_cnt == 0) {
 		goto out;
 	}
@@ -2187,15 +2239,9 @@ void bond_mii_monitor(struct net_device *bond_dev)
 
 		bond_select_active_slave(bond);
 
-		if (oldcurrent && !bond->curr_active_slave) {
-			printk(KERN_INFO DRV_NAME
-			       ": %s: now running without any active "
-			       "interface !\n",
-			       bond_dev->name);
-		}
-
 		write_unlock(&bond->curr_slave_lock);
-	}
+	} else
+		bond_set_carrier(bond);
 
 re_arm:
 	if (bond->params.miimon) {
@@ -2499,13 +2545,6 @@ void bond_loadbalance_arp_mon(struct net_device *bond_dev)
 
 		bond_select_active_slave(bond);
 
-		if (oldcurrent && !bond->curr_active_slave) {
-			printk(KERN_INFO DRV_NAME
-			       ": %s: now running without any active "
-			       "interface !\n",
-			       bond_dev->name);
-		}
-
 		write_unlock(&bond->curr_slave_lock);
 	}
 
@@ -2579,12 +2618,15 @@ void bond_activebackup_arp_mon(struct net_device *bond_dev)
 					bond->current_arp_slave = NULL;
 				}
 
+				bond_set_carrier(bond);
+
 				if (slave == bond->curr_active_slave) {
 					printk(KERN_INFO DRV_NAME
 					       ": %s: %s is up and now the "
 					       "active interface\n",
 					       bond_dev->name,
 					       slave->dev->name);
+					netif_carrier_on(bond->dev);
 				} else {
 					printk(KERN_INFO DRV_NAME
 					       ": %s: backup interface %s is "
@@ -2844,7 +2886,8 @@ static void bond_info_show_master(struct seq_file *seq)
 			   (curr) ? curr->dev->name : "None");
 	}
 
-	seq_printf(seq, "MII Status: %s\n", (curr) ? "up" : "down");
+	seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
+		   "up" : "down");
 	seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
 	seq_printf(seq, "Up Delay (ms): %d\n",
 		   bond->params.updelay * bond->params.miimon);
@@ -4531,6 +4574,8 @@ int bond_create(char *name, struct bond_params *params, struct bonding **newbond
 	if (newbond)
 		*newbond = bond_dev->priv;
 
+	netif_carrier_off(bond_dev);
+
 	rtnl_unlock(); /* allows sysfs registration of net device */
 	res = bond_create_sysfs_entry(bond_dev->priv);
 	goto done;
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index ce9dc9b4e2d..0bdfe2c7145 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -22,8 +22,8 @@
 #include "bond_3ad.h"
 #include "bond_alb.h"
 
-#define DRV_VERSION	"3.0.2"
-#define DRV_RELDATE	"February 21, 2006"
+#define DRV_VERSION	"3.0.3"
+#define DRV_RELDATE	"March 23, 2006"
 #define DRV_NAME	"bonding"
 #define DRV_DESCRIPTION	"Ethernet Channel Bonding Driver"