[PATCH] bonding: add sysfs functionality to bonding (large)

This large patch adds sysfs functionality to the channel bonding module.
Bonds can be added, removed, and reconfigured at runtime without having
to reload the module.  Multiple bonds with different configurations are
easily configured, and ifenslave is no longer required to configure bonds.
Signed-off-by: NMitch Williams <mitch.a.williams@intel.com>
Acked-by: NJay Vosburgh <fubar@us.ibm.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/bonding/Makefile

@@ -4,5 +4,5 @@
 
 obj-$(CONFIG_BONDING) += bonding.o
 
-bonding-objs := bond_main.o bond_3ad.o bond_alb.o
+bonding-objs := bond_main.o bond_3ad.o bond_alb.o bond_sysfs.o
 

drivers/net/bonding/bond_main.c

@@ -600,6 +600,7 @@ LIST_HEAD(bond_dev_list);
 static struct proc_dir_entry *bond_proc_dir = NULL;
 #endif
 
+extern struct rw_semaphore bonding_rwsem;
 static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
 static int arp_ip_count	= 0;
 static int bond_mode	= BOND_MODE_ROUNDROBIN;
@@ -1960,6 +1961,10 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 
 	write_unlock_bh(&bond->lock);
 
+	res = bond_create_slave_symlinks(bond_dev, slave_dev);
+	if (res)
+		goto err_unset_master;
+
 	printk(KERN_INFO DRV_NAME
 	       ": %s: enslaving %s as a%s interface with a%s link.\n",
 	       bond_dev->name, slave_dev->name,
@@ -2133,6 +2138,9 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
 
 	write_unlock_bh(&bond->lock);
 
+	/* must do this from outside any spinlocks */
+	bond_destroy_slave_symlinks(bond_dev, slave_dev);
+
 	bond_del_vlans_from_slave(bond, slave_dev);
 
 	/* If the mode USES_PRIMARY, then we should only remove its
@@ -2224,6 +2232,7 @@ static int bond_release_all(struct net_device *bond_dev)
 		 */
 		write_unlock_bh(&bond->lock);
 
+		bond_destroy_slave_symlinks(bond_dev, slave_dev);
 		bond_del_vlans_from_slave(bond, slave_dev);
 
 		/* If the mode USES_PRIMARY, then we should only remove its
@@ -3518,7 +3527,10 @@ static int bond_event_changename(struct bonding *bond)
 	bond_remove_proc_entry(bond);
 	bond_create_proc_entry(bond);
 #endif
-
+	down_write(&(bonding_rwsem));
+        bond_destroy_sysfs_entry(bond);
+        bond_create_sysfs_entry(bond);
+	up_write(&(bonding_rwsem));
 	return NOTIFY_DONE;
 }
 
@@ -3995,6 +4007,7 @@ static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd
 		return -EPERM;
 	}
 
+	down_write(&(bonding_rwsem));
 	slave_dev = dev_get_by_name(ifr->ifr_slave);
 
 	dprintk("slave_dev=%p: \n", slave_dev);
@@ -4027,6 +4040,7 @@ static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd
 		dev_put(slave_dev);
 	}
 
+	up_write(&(bonding_rwsem));
 	return res;
 }
 
@@ -4962,6 +4976,7 @@ int bond_create(char *name, struct bond_params *params, struct bonding **newbond
 		*newbond = bond_dev->priv;
 
 	rtnl_unlock(); /* allows sysfs registration of net device */
+	res = bond_create_sysfs_entry(bond_dev->priv);
 	goto done;
 out_bond:
 	bond_deinit(bond_dev);
@@ -4996,6 +5011,10 @@ static int __init bonding_init(void)
 			goto err;
 	}
 
+	res = bond_create_sysfs();
+	if (res)
+		goto err;
+
 	register_netdevice_notifier(&bond_netdev_notifier);
 	register_inetaddr_notifier(&bond_inetaddr_notifier);
 
@@ -5003,6 +5022,7 @@ static int __init bonding_init(void)
 err:
 	rtnl_lock();
 	bond_free_all();
+	bond_destroy_sysfs();
 	rtnl_unlock();
 out:
 	return res;
@@ -5016,6 +5036,7 @@ static void __exit bonding_exit(void)
 
 	rtnl_lock();
 	bond_free_all();
+	bond_destroy_sysfs();
 	rtnl_unlock();
 }
 

drivers/net/bonding/bonding.h

@@ -37,6 +37,7 @@
 #include <linux/timer.h>
 #include <linux/proc_fs.h>
 #include <linux/if_bonding.h>
+#include <linux/kobject.h>
 #include "bond_3ad.h"
 #include "bond_alb.h"
 
@@ -262,6 +263,12 @@ struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 int bond_create(char *name, struct bond_params *params, struct bonding **newbond);
 void bond_deinit(struct net_device *bond_dev);
+int bond_create_sysfs(void);
+void bond_destroy_sysfs(void);
+void bond_destroy_sysfs_entry(struct bonding *bond);
+int bond_create_sysfs_entry(struct bonding *bond);
+int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
+void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 int bond_sethwaddr(struct net_device *bond_dev, struct net_device *slave_dev);