[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: Mitch Williams <[e-mail]>
Acked-by: Jay Vosburgh <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

drivers/net/bonding/Makefile

···
 
 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

···
 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;
···
 
 	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,
···
 
 	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
···
 		 */
 		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
···
 	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;
 }
 
···
 		return -EPERM;
 	}
 
+	down_write(&(bonding_rwsem));
 	slave_dev = dev_get_by_name(ifr->ifr_slave);
 
 	dprintk("slave_dev=%p: \n", slave_dev);
···
 		dev_put(slave_dev);
 	}
 
+	up_write(&(bonding_rwsem));
 	return res;
 }
 
···
 		*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);
···
 			goto err;
 	}
 
+	res = bond_create_sysfs();
+	if (res)
+		goto err;
+
 	register_netdevice_notifier(&bond_netdev_notifier);
 	register_inetaddr_notifier(&bond_inetaddr_notifier);
 
···
 err:
 	rtnl_lock();
 	bond_free_all();
+	bond_destroy_sysfs();
 	rtnl_unlock();
 out:
 	return res;
···
 
 	rtnl_lock();
 	bond_free_all();
+	bond_destroy_sysfs();
 	rtnl_unlock();
 }
 

drivers/net/bonding/bond_sysfs.c

···
+
+/*
+ * Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called LICENSE.
+ *
+ *
+ * Changes:
+ *
+ * 2004/12/12 - Mitch Williams <mitch.a.williams at intel dot com>
+ *	- Initial creation of sysfs interface.
+ *
+ * 2005/06/22 - Radheka Godse <radheka.godse at intel dot com>
+ *	- Added ifenslave -c type functionality to sysfs
+ *	- Added sysfs files for attributes such as  MII Status and
+ *	  802.3ad aggregator that are displayed in /proc
+ *	- Added "name value" format to sysfs "mode" and
+ *	  "lacp_rate", for e.g., "active-backup 1" or "slow 0" for
+ *	  consistency and ease of script parsing
+ *	- Fixed reversal of octets in arp_ip_targets via sysfs
+ *	- sysfs support to handle bond interface re-naming
+ *	- Moved all sysfs entries into /sys/class/net instead of
+ *	  of using a standalone subsystem.
+ *	- Added sysfs symlinks between masters and slaves
+ *	- Corrected bugs in sysfs unload path when creating bonds
+ *	  with existing interface names.
+ *	- Removed redundant sysfs stat file since it duplicates slave info
+ *	  from the proc file
+ *	- Fixed errors in sysfs show/store arp targets.
+ *	- For consistency with ifenslave, instead of exiting
+ *	  with an error, updated bonding sysfs to
+ *	  close and attempt to enslave an up adapter.
+ *	- Fixed NULL dereference when adding a slave interface
+ *	  that does not exist.
+ *	- Added checks in sysfs bonding to reject invalid ip addresses
+ *	- Synch up with post linux-2.6.12 bonding changes
+ *	- Created sysfs bond attrib for xmit_hash_policy
+ *
+ * 2005/09/19 - Mitch Williams <mitch.a.williams at intel dot com>
+ *	- Changed semantics of multi-item files to be command-based
+ *	  instead of list-based.
+ *	- Changed ARP target handler to use in_aton instead of sscanf
+ *      - Style changes.
+ * 2005/09/27 - Mitch Williams <mitch.a.williams at intel dot com>
+ *      - Made line endings consistent.
+ *      - Removed "none" from primary output - just put blank instead
+ *      - Fixed bug with long interface names
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <linux/sysdev.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/in.h>
+#include <linux/sysfs.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/inet.h>
+#include <linux/rtnetlink.h>
+
+/* #define BONDING_DEBUG 1 */
+#include "bonding.h"
+#define to_class_dev(obj) container_of(obj,struct class_device,kobj)
+#define to_net_dev(class) container_of(class, struct net_device, class_dev)
+#define to_bond(cd)	((struct bonding *)(to_net_dev(cd)->priv))
+
+/*---------------------------- Declarations -------------------------------*/
+
+
+extern struct list_head bond_dev_list;
+extern struct bond_params bonding_defaults;
+extern struct bond_parm_tbl bond_mode_tbl[];
+extern struct bond_parm_tbl bond_lacp_tbl[];
+extern struct bond_parm_tbl xmit_hashtype_tbl[];
+
+static int expected_refcount = -1;
+static struct class *netdev_class;
+/*--------------------------- Data Structures -----------------------------*/
+
+/* Bonding sysfs lock.  Why can't we just use the subsytem lock?
+ * Because kobject_register tries to acquire the subsystem lock.  If
+ * we already hold the lock (which we would if the user was creating
+ * a new bond through the sysfs interface), we deadlock.
+ * This lock is only needed when deleting a bond - we need to make sure
+ * that we don't collide with an ongoing ioctl.
+ */
+
+struct rw_semaphore bonding_rwsem;
+
+
+
+
+/*------------------------------ Functions --------------------------------*/
+
+/*
+ * "show" function for the bond_masters attribute.
+ * The class parameter is ignored.
+ */
+static ssize_t bonding_show_bonds(struct class *cls, char *buffer)
+{
+	int res = 0;
+	struct bonding *bond;
+
+	down_read(&(bonding_rwsem));
+
+	list_for_each_entry(bond, &bond_dev_list, bond_list) {
+		if (res > (PAGE_SIZE - IFNAMSIZ)) {
+			/* not enough space for another interface name */
+			if ((PAGE_SIZE - res) > 10)
+				res = PAGE_SIZE - 10;
+			res += sprintf(buffer + res, "++more++");
+			break;
+		}
+		res += sprintf(buffer + res, "%s ",
+			       bond->dev->name);
+	}
+	res += sprintf(buffer + res, "\n");
+	res++;
+	up_read(&(bonding_rwsem));
+	return res;
+}
+
+/*
+ * "store" function for the bond_masters attribute.  This is what
+ * creates and deletes entire bonds.
+ *
+ * The class parameter is ignored.
+ *
+ */
+
+static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t count)
+{
+	char command[IFNAMSIZ + 1] = {0, };
+	char *ifname;
+	int res = count;
+	struct bonding *bond;
+	struct bonding *nxt;
+
+	down_write(&(bonding_rwsem));
+	sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
+	ifname = command + 1;
+	if ((strlen(command) <= 1) ||
+	    !dev_valid_name(ifname))
+		goto err_no_cmd;
+
+	if (command[0] == '+') {
+
+		/* Check to see if the bond already exists. */
+		list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
+			if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
+				printk(KERN_ERR DRV_NAME
+					": cannot add bond %s; it already exists\n",
+					ifname);
+				res = -EPERM;
+				goto out;
+			}
+
+		printk(KERN_INFO DRV_NAME
+			": %s is being created...\n", ifname);
+		if (bond_create(ifname, &bonding_defaults, &bond)) {
+			printk(KERN_INFO DRV_NAME
+			": %s interface already exists. Bond creation failed.\n",
+			ifname);
+			res = -EPERM;
+		}
+		goto out;
+	}
+
+	if (command[0] == '-') {
+		list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
+			if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
+				rtnl_lock();
+				/* check the ref count on the bond's kobject.
+				 * If it's > expected, then there's a file open,
+				 * and we have to fail.
+				 */
+				if (atomic_read(&bond->dev->class_dev.kobj.kref.refcount)
+							> expected_refcount){
+					rtnl_unlock();
+					printk(KERN_INFO DRV_NAME
+						": Unable remove bond %s due to open references.\n",
+						ifname);
+					res = -EPERM;
+					goto out;
+				}
+				printk(KERN_INFO DRV_NAME
+					": %s is being deleted...\n",
+					bond->dev->name);
+				unregister_netdevice(bond->dev);
+				bond_deinit(bond->dev);
+		        	bond_destroy_sysfs_entry(bond);
+				rtnl_unlock();
+				goto out;
+			}
+
+		printk(KERN_ERR DRV_NAME
+			": unable to delete non-existent bond %s\n", ifname);
+		res = -ENODEV;
+		goto out;
+	}
+
+err_no_cmd:
+	printk(KERN_ERR DRV_NAME
+		": no command found in bonding_masters. Use +ifname or -ifname.\n");
+	res = -EPERM;
+
+	/* Always return either count or an error.  If you return 0, you'll
+	 * get called forever, which is bad.
+	 */
+out:
+	up_write(&(bonding_rwsem));
+	return res;
+}
+/* class attribute for bond_masters file.  This ends up in /sys/class/net */
+static CLASS_ATTR(bonding_masters,  S_IWUSR | S_IRUGO,
+		  bonding_show_bonds, bonding_store_bonds);
+
+int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave)
+{
+	char linkname[IFNAMSIZ+7];
+	int ret = 0;
+
+	/* first, create a link from the slave back to the master */
+	ret = sysfs_create_link(&(slave->class_dev.kobj), &(master->class_dev.kobj),
+				"master");
+	if (ret)
+		return ret;
+	/* next, create a link from the master to the slave */
+	sprintf(linkname,"slave_%s",slave->name);
+	ret = sysfs_create_link(&(master->class_dev.kobj), &(slave->class_dev.kobj),
+				linkname);
+	return ret;
+
+}
+
+void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave)
+{
+	char linkname[IFNAMSIZ+7];
+
+	sysfs_remove_link(&(slave->class_dev.kobj), "master");
+	sprintf(linkname,"slave_%s",slave->name);
+	sysfs_remove_link(&(master->class_dev.kobj), linkname);
+}
+
+
+/*
+ * Show the slaves in the current bond.
+ */
+static ssize_t bonding_show_slaves(struct class_device *cd, char *buf)
+{
+	struct slave *slave;
+	int i, res = 0;
+	struct bonding *bond = to_bond(cd);
+
+	read_lock_bh(&bond->lock);
+	bond_for_each_slave(bond, slave, i) {
+		if (res > (PAGE_SIZE - IFNAMSIZ)) {
+			/* not enough space for another interface name */
+			if ((PAGE_SIZE - res) > 10)
+				res = PAGE_SIZE - 10;
+			res += sprintf(buf + res, "++more++");
+			break;
+		}
+		res += sprintf(buf + res, "%s ", slave->dev->name);
+	}
+	read_unlock_bh(&bond->lock);
+	res += sprintf(buf + res, "\n");
+	res++;
+	return res;
+}
+
+/*
+ * Set the slaves in the current bond.  The bond interface must be
+ * up for this to succeed.
+ * This function is largely the same flow as bonding_update_bonds().
+ */
+static ssize_t bonding_store_slaves(struct class_device *cd, const char *buffer, size_t count)
+{
+	char command[IFNAMSIZ + 1] = { 0, };
+	char *ifname;
+	int i, res, found, ret = count;
+	struct slave *slave;
+	struct net_device *dev = 0;
+	struct bonding *bond = to_bond(cd);
+
+	/* Quick sanity check -- is the bond interface up? */
+	if (!(bond->dev->flags & IFF_UP)) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Unable to update slaves because interface is down.\n",
+		       bond->dev->name);
+		ret = -EPERM;
+		goto out;
+	}
+
+	/* Note:  We can't hold bond->lock here, as bond_create grabs it. */
+
+	sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
+	ifname = command + 1;
+	if ((strlen(command) <= 1) ||
+	    !dev_valid_name(ifname))
+		goto err_no_cmd;
+
+	if (command[0] == '+') {
+
+		/* Got a slave name in ifname.  Is it already in the list? */
+		found = 0;
+		read_lock_bh(&bond->lock);
+		bond_for_each_slave(bond, slave, i)
+			if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
+				printk(KERN_ERR DRV_NAME
+				       ": %s: Interface %s is already enslaved!\n",
+				       bond->dev->name, ifname);
+				ret = -EPERM;
+				read_unlock_bh(&bond->lock);
+				goto out;
+			}
+
+		read_unlock_bh(&bond->lock);
+		printk(KERN_INFO DRV_NAME ": %s: Adding slave %s.\n",
+		       bond->dev->name, ifname);
+		dev = dev_get_by_name(ifname);
+		if (!dev) {
+			printk(KERN_INFO DRV_NAME
+			       ": %s: Interface %s does not exist!\n",
+			       bond->dev->name, ifname);
+			ret = -EPERM;
+			goto out;
+		}
+		else
+			dev_put(dev);
+
+		if (dev->flags & IFF_UP) {
+			printk(KERN_ERR DRV_NAME
+			       ": %s: Error: Unable to enslave %s "
+			       "because it is already up.\n",
+			       bond->dev->name, dev->name);
+			ret = -EPERM;
+			goto out;
+		}
+		/* If this is the first slave, then we need to set
+		   the master's hardware address to be the same as the
+		   slave's. */
+		if (!(*((u32 *) & (bond->dev->dev_addr[0])))) {
+			memcpy(bond->dev->dev_addr, dev->dev_addr,
+			       dev->addr_len);
+		}
+
+		/* Set the slave's MTU to match the bond */
+		if (dev->mtu != bond->dev->mtu) {
+			if (dev->change_mtu) {
+				res = dev->change_mtu(dev,
+						      bond->dev->mtu);
+				if (res) {
+					ret = res;
+					goto out;
+				}
+			} else {
+				dev->mtu = bond->dev->mtu;
+			}
+		}
+		rtnl_lock();
+		res = bond_enslave(bond->dev, dev);
+		rtnl_unlock();
+		if (res) {
+			ret = res;
+		}
+		goto out;
+	}
+
+	if (command[0] == '-') {
+		dev = NULL;
+		bond_for_each_slave(bond, slave, i)
+			if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
+				dev = slave->dev;
+				break;
+			}
+		if (dev) {
+			printk(KERN_INFO DRV_NAME ": %s: Removing slave %s\n",
+				bond->dev->name, dev->name);
+			rtnl_lock();
+			res = bond_release(bond->dev, dev);
+			rtnl_unlock();
+			if (res) {
+				ret = res;
+				goto out;
+			}
+			/* set the slave MTU to the default */
+			if (dev->change_mtu) {
+				dev->change_mtu(dev, 1500);
+			} else {
+				dev->mtu = 1500;
+			}
+		}
+		else {
+			printk(KERN_ERR DRV_NAME ": unable to remove non-existent slave %s for bond %s.\n",
+				ifname, bond->dev->name);
+			ret = -ENODEV;
+		}
+		goto out;
+	}
+
+err_no_cmd:
+	printk(KERN_ERR DRV_NAME ": no command found in slaves file for bond %s. Use +ifname or -ifname.\n", bond->dev->name);
+	ret = -EPERM;
+
+out:
+	return ret;
+}
+
+static CLASS_DEVICE_ATTR(slaves, S_IRUGO | S_IWUSR, bonding_show_slaves, bonding_store_slaves);
+
+/*
+ * Show and set the bonding mode.  The bond interface must be down to
+ * change the mode.
+ */
+static ssize_t bonding_show_mode(struct class_device *cd, char *buf)
+{
+	struct bonding *bond = to_bond(cd);
+
+	return sprintf(buf, "%s %d\n",
+			bond_mode_tbl[bond->params.mode].modename,
+			bond->params.mode) + 1;
+}
+
+static ssize_t bonding_store_mode(struct class_device *cd, const char *buf, size_t count)
+{
+	int new_value, ret = count;
+	struct bonding *bond = to_bond(cd);
+
+	if (bond->dev->flags & IFF_UP) {
+		printk(KERN_ERR DRV_NAME
+		       ": unable to update mode of %s because interface is up.\n",
+		       bond->dev->name);
+		ret = -EPERM;
+		goto out;
+	}
+
+	new_value = bond_parse_parm((char *)buf, bond_mode_tbl);
+	if (new_value < 0)  {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Ignoring invalid mode value %.*s.\n",
+		       bond->dev->name,
+		       (int)strlen(buf) - 1, buf);
+		ret = -EINVAL;
+		goto out;
+	} else {
+		bond->params.mode = new_value;
+		bond_set_mode_ops(bond, bond->params.mode);
+		printk(KERN_INFO DRV_NAME ": %s: setting mode to %s (%d).\n",
+			bond->dev->name, bond_mode_tbl[new_value].modename, new_value);
+	}
+out:
+	return ret;
+}
+static CLASS_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, bonding_show_mode, bonding_store_mode);
+
+/*
+ * Show and set the bonding transmit hash method.  The bond interface must be down to
+ * change the xmit hash policy.
+ */
+static ssize_t bonding_show_xmit_hash(struct class_device *cd, char *buf)
+{
+	int count;
+	struct bonding *bond = to_bond(cd);
+
+	if ((bond->params.mode != BOND_MODE_XOR) &&
+	    (bond->params.mode != BOND_MODE_8023AD)) {
+		// Not Applicable
+		count = sprintf(buf, "NA\n") + 1;
+	} else {
+		count = sprintf(buf, "%s %d\n",
+			xmit_hashtype_tbl[bond->params.xmit_policy].modename,
+			bond->params.xmit_policy) + 1;
+	}
+
+	return count;
+}
+
+static ssize_t bonding_store_xmit_hash(struct class_device *cd, const char *buf, size_t count)
+{
+	int new_value, ret = count;
+	struct bonding *bond = to_bond(cd);
+
+	if (bond->dev->flags & IFF_UP) {
+		printk(KERN_ERR DRV_NAME
+		       "%s: Interface is up. Unable to update xmit policy.\n",
+		       bond->dev->name);
+		ret = -EPERM;
+		goto out;
+	}
+
+	if ((bond->params.mode != BOND_MODE_XOR) &&
+	    (bond->params.mode != BOND_MODE_8023AD)) {
+		printk(KERN_ERR DRV_NAME
+		       "%s: Transmit hash policy is irrelevant in this mode.\n",
+		       bond->dev->name);
+		ret = -EPERM;
+		goto out;
+	}
+
+	new_value = bond_parse_parm((char *)buf, xmit_hashtype_tbl);
+	if (new_value < 0)  {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Ignoring invalid xmit hash policy value %.*s.\n",
+		       bond->dev->name,
+		       (int)strlen(buf) - 1, buf);
+		ret = -EINVAL;
+		goto out;
+	} else {
+		bond->params.xmit_policy = new_value;
+		bond_set_mode_ops(bond, bond->params.mode);
+		printk(KERN_INFO DRV_NAME ": %s: setting xmit hash policy to %s (%d).\n",
+			bond->dev->name, xmit_hashtype_tbl[new_value].modename, new_value);
+	}
+out:
+	return ret;
+}
+static CLASS_DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR, bonding_show_xmit_hash, bonding_store_xmit_hash);
+
+/*
+ * Show and set the arp timer interval.  There are two tricky bits
+ * here.  First, if ARP monitoring is activated, then we must disable
+ * MII monitoring.  Second, if the ARP timer isn't running, we must
+ * start it.
+ */
+static ssize_t bonding_show_arp_interval(struct class_device *cd, char *buf)
+{
+	struct bonding *bond = to_bond(cd);
+
+	return sprintf(buf, "%d\n", bond->params.arp_interval) + 1;
+}
+
+static ssize_t bonding_store_arp_interval(struct class_device *cd, const char *buf, size_t count)
+{
+	int new_value, ret = count;
+	struct bonding *bond = to_bond(cd);
+
+	if (sscanf(buf, "%d", &new_value) != 1) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: no arp_interval value specified.\n",
+		       bond->dev->name);
+		ret = -EINVAL;
+		goto out;
+	}
+	if (new_value < 0) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Invalid arp_interval value %d not in range 1-%d; rejected.\n",
+		       bond->dev->name, new_value, INT_MAX);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	printk(KERN_INFO DRV_NAME
+	       ": %s: Setting ARP monitoring interval to %d.\n",
+	       bond->dev->name, new_value);
+	bond->params.arp_interval = new_value;
+	if (bond->params.miimon) {
+		printk(KERN_INFO DRV_NAME
+		       ": %s: ARP monitoring cannot be used with MII monitoring. "
+		       "%s Disabling MII monitoring.\n",
+		       bond->dev->name, bond->dev->name);
+		bond->params.miimon = 0;
+		/* Kill MII timer, else it brings bond's link down */
+		if (bond->arp_timer.function) {
+			printk(KERN_INFO DRV_NAME
+			": %s: Kill MII timer, else it brings bond's link down...\n",
+		       bond->dev->name);
+			del_timer_sync(&bond->mii_timer);
+		}
+	}
+	if (!bond->params.arp_targets[0]) {
+		printk(KERN_INFO DRV_NAME
+		       ": %s: ARP monitoring has been set up, "
+		       "but no ARP targets have been specified.\n",
+		       bond->dev->name);
+	}
+	if (bond->dev->flags & IFF_UP) {
+		/* If the interface is up, we may need to fire off
+		 * the ARP timer.  If the interface is down, the
+		 * timer will get fired off when the open function
+		 * is called.
+		 */
+		if (bond->arp_timer.function) {
+			/* The timer's already set up, so fire it off */
+			mod_timer(&bond->arp_timer, jiffies + 1);
+		} else {
+			/* Set up the timer. */
+			init_timer(&bond->arp_timer);
+			bond->arp_timer.expires = jiffies + 1;
+			bond->arp_timer.data =
+				(unsigned long) bond->dev;
+			if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
+				bond->arp_timer.function =
+					(void *)
+					&bond_activebackup_arp_mon;
+			} else {
+				bond->arp_timer.function =
+					(void *)
+					&bond_loadbalance_arp_mon;
+			}
+			add_timer(&bond->arp_timer);
+		}
+	}
+
+out:
+	return ret;
+}
+static CLASS_DEVICE_ATTR(arp_interval, S_IRUGO | S_IWUSR , bonding_show_arp_interval, bonding_store_arp_interval);
+
+/*
+ * Show and set the arp targets.
+ */
+static ssize_t bonding_show_arp_targets(struct class_device *cd, char *buf)
+{
+	int i, res = 0;
+	struct bonding *bond = to_bond(cd);
+
+	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
+		if (bond->params.arp_targets[i])
+			res += sprintf(buf + res, "%u.%u.%u.%u ",
+			       NIPQUAD(bond->params.arp_targets[i]));
+	}
+	if (res)
+		res--;  /* eat the leftover space */
+	res += sprintf(buf + res, "\n");
+	res++;
+	return res;
+}
+
+static ssize_t bonding_store_arp_targets(struct class_device *cd, const char *buf, size_t count)
+{
+	u32 newtarget;
+	int i = 0, done = 0, ret = count;
+	struct bonding *bond = to_bond(cd);
+	u32 *targets;
+
+	targets = bond->params.arp_targets;
+	newtarget = in_aton(buf + 1);
+	/* look for adds */
+	if (buf[0] == '+') {
+		if ((newtarget == 0) || (newtarget == INADDR_BROADCAST)) {
+			printk(KERN_ERR DRV_NAME
+			       ": %s: invalid ARP target %u.%u.%u.%u specified for addition\n",
+ 			       bond->dev->name, NIPQUAD(newtarget));
+			ret = -EINVAL;
+			goto out;
+		}
+		/* look for an empty slot to put the target in, and check for dupes */
+		for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
+			if (targets[i] == newtarget) { /* duplicate */
+				printk(KERN_ERR DRV_NAME
+				       ": %s: ARP target %u.%u.%u.%u is already present\n",
+				       bond->dev->name, NIPQUAD(newtarget));
+				if (done)
+					targets[i] = 0;
+				ret = -EINVAL;
+				goto out;
+			}
+			if (targets[i] == 0 && !done) {
+				printk(KERN_INFO DRV_NAME
+				       ": %s: adding ARP target %d.%d.%d.%d.\n",
+				       bond->dev->name, NIPQUAD(newtarget));
+				done = 1;
+				targets[i] = newtarget;
+			}
+		}
+		if (!done) {
+			printk(KERN_ERR DRV_NAME
+			       ": %s: ARP target table is full!\n",
+			       bond->dev->name);
+			ret = -EINVAL;
+			goto out;
+		}
+
+	}
+	else if (buf[0] == '-')	{
+		if ((newtarget == 0) || (newtarget == INADDR_BROADCAST)) {
+			printk(KERN_ERR DRV_NAME
+			       ": %s: invalid ARP target %d.%d.%d.%d specified for removal\n",
+			       bond->dev->name, NIPQUAD(newtarget));
+			ret = -EINVAL;
+			goto out;
+		}
+
+		for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
+			if (targets[i] == newtarget) {
+				printk(KERN_INFO DRV_NAME
+				       ": %s: removing ARP target %d.%d.%d.%d.\n",
+				       bond->dev->name, NIPQUAD(newtarget));
+				targets[i] = 0;
+				done = 1;
+			}
+		}
+		if (!done) {
+			printk(KERN_INFO DRV_NAME
+			       ": %s: unable to remove nonexistent ARP target %d.%d.%d.%d.\n",
+			       bond->dev->name, NIPQUAD(newtarget));
+			ret = -EINVAL;
+			goto out;
+		}
+	}
+	else {
+		printk(KERN_ERR DRV_NAME ": no command found in arp_ip_targets file for bond %s. Use +<addr> or -<addr>.\n",
+			bond->dev->name);
+		ret = -EPERM;
+		goto out;
+	}
+
+out:
+	return ret;
+}
+static CLASS_DEVICE_ATTR(arp_ip_target, S_IRUGO | S_IWUSR , bonding_show_arp_targets, bonding_store_arp_targets);
+
+/*
+ * Show and set the up and down delays.  These must be multiples of the
+ * MII monitoring value, and are stored internally as the multiplier.
+ * Thus, we must translate to MS for the real world.
+ */
+static ssize_t bonding_show_downdelay(struct class_device *cd, char *buf)
+{
+	struct bonding *bond = to_bond(cd);
+
+	return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon) + 1;
+}
+
+static ssize_t bonding_store_downdelay(struct class_device *cd, const char *buf, size_t count)
+{
+	int new_value, ret = count;
+	struct bonding *bond = to_bond(cd);
+
+	if (!(bond->params.miimon)) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Unable to set down delay as MII monitoring is disabled\n",
+		       bond->dev->name);
+		ret = -EPERM;
+		goto out;
+	}
+
+	if (sscanf(buf, "%d", &new_value) != 1) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: no down delay value specified.\n",
+		       bond->dev->name);
+		ret = -EINVAL;
+		goto out;
+	}
+	if (new_value < 0) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
+		       bond->dev->name, new_value, 1, INT_MAX);
+		ret = -EINVAL;
+		goto out;
+	} else {
+		if ((new_value % bond->params.miimon) != 0) {
+			printk(KERN_WARNING DRV_NAME
+			       ": %s: Warning: down delay (%d) is not a multiple "
+			       "of miimon (%d), delay rounded to %d ms\n",
+			       bond->dev->name, new_value, bond->params.miimon,
+			       (new_value / bond->params.miimon) *
+			       bond->params.miimon);
+		}
+		bond->params.downdelay = new_value / bond->params.miimon;
+		printk(KERN_INFO DRV_NAME ": %s: Setting down delay to %d.\n",
+		       bond->dev->name, bond->params.downdelay * bond->params.miimon);
+
+	}
+
+out:
+	return ret;
+}
+static CLASS_DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR , bonding_show_downdelay, bonding_store_downdelay);
+
+static ssize_t bonding_show_updelay(struct class_device *cd, char *buf)
+{
+	struct bonding *bond = to_bond(cd);
+
+	return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon) + 1;
+
+}
+
+static ssize_t bonding_store_updelay(struct class_device *cd, const char *buf, size_t count)
+{
+	int new_value, ret = count;
+	struct bonding *bond = to_bond(cd);
+
+	if (!(bond->params.miimon)) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Unable to set up delay as MII monitoring is disabled\n",
+		       bond->dev->name);
+		ret = -EPERM;
+		goto out;
+	}
+
+	if (sscanf(buf, "%d", &new_value) != 1) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: no up delay value specified.\n",
+		       bond->dev->name);
+		ret = -EINVAL;
+		goto out;
+	}
+	if (new_value < 0) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
+		       bond->dev->name, new_value, 1, INT_MAX);
+		ret = -EINVAL;
+		goto out;
+	} else {
+		if ((new_value % bond->params.miimon) != 0) {
+			printk(KERN_WARNING DRV_NAME
+			       ": %s: Warning: up delay (%d) is not a multiple "
+			       "of miimon (%d), updelay rounded to %d ms\n",
+			       bond->dev->name, new_value, bond->params.miimon,
+			       (new_value / bond->params.miimon) *
+			       bond->params.miimon);
+		}
+		bond->params.updelay = new_value / bond->params.miimon;
+		printk(KERN_INFO DRV_NAME ": %s: Setting up delay to %d.\n",
+		       bond->dev->name, bond->params.updelay * bond->params.miimon);
+
+	}
+
+out:
+	return ret;
+}
+static CLASS_DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR , bonding_show_updelay, bonding_store_updelay);
+
+/*
+ * Show and set the LACP interval.  Interface must be down, and the mode
+ * must be set to 802.3ad mode.
+ */
+static ssize_t bonding_show_lacp(struct class_device *cd, char *buf)
+{
+	struct bonding *bond = to_bond(cd);
+
+	return sprintf(buf, "%s %d\n",
+		bond_lacp_tbl[bond->params.lacp_fast].modename,
+		bond->params.lacp_fast) + 1;
+}
+
+static ssize_t bonding_store_lacp(struct class_device *cd, const char *buf, size_t count)
+{
+	int new_value, ret = count;
+	struct bonding *bond = to_bond(cd);
+
+	if (bond->dev->flags & IFF_UP) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Unable to update LACP rate because interface is up.\n",
+		       bond->dev->name);
+		ret = -EPERM;
+		goto out;
+	}
+
+	if (bond->params.mode != BOND_MODE_8023AD) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Unable to update LACP rate because bond is not in 802.3ad mode.\n",
+		       bond->dev->name);
+		ret = -EPERM;
+		goto out;
+	}
+
+	new_value = bond_parse_parm((char *)buf, bond_lacp_tbl);
+
+	if ((new_value == 1) || (new_value == 0)) {
+		bond->params.lacp_fast = new_value;
+		printk(KERN_INFO DRV_NAME
+		       ": %s: Setting LACP rate to %s (%d).\n",
+		       bond->dev->name, bond_lacp_tbl[new_value].modename, new_value);
+	} else {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Ignoring invalid LACP rate value %.*s.\n",
+		     	bond->dev->name, (int)strlen(buf) - 1, buf);
+		ret = -EINVAL;
+	}
+out:
+	return ret;
+}
+static CLASS_DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR, bonding_show_lacp, bonding_store_lacp);
+
+/*
+ * Show and set the MII monitor interval.  There are two tricky bits
+ * here.  First, if MII monitoring is activated, then we must disable
+ * ARP monitoring.  Second, if the timer isn't running, we must
+ * start it.
+ */
+static ssize_t bonding_show_miimon(struct class_device *cd, char *buf)
+{
+	struct bonding *bond = to_bond(cd);
+
+	return sprintf(buf, "%d\n", bond->params.miimon) + 1;
+}
+
+static ssize_t bonding_store_miimon(struct class_device *cd, const char *buf, size_t count)
+{
+	int new_value, ret = count;
+	struct bonding *bond = to_bond(cd);
+
+	if (sscanf(buf, "%d", &new_value) != 1) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: no miimon value specified.\n",
+		       bond->dev->name);
+		ret = -EINVAL;
+		goto out;
+	}
+	if (new_value < 0) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Invalid miimon value %d not in range %d-%d; rejected.\n",
+		       bond->dev->name, new_value, 1, INT_MAX);
+		ret = -EINVAL;
+		goto out;
+	} else {
+		printk(KERN_INFO DRV_NAME
+		       ": %s: Setting MII monitoring interval to %d.\n",
+		       bond->dev->name, new_value);
+		bond->params.miimon = new_value;
+		if(bond->params.updelay)
+			printk(KERN_INFO DRV_NAME
+			      ": %s: Note: Updating updelay (to %d) "
+			      "since it is a multiple of the miimon value.\n",
+			      bond->dev->name,
+			      bond->params.updelay * bond->params.miimon);
+		if(bond->params.downdelay)
+			printk(KERN_INFO DRV_NAME
+			      ": %s: Note: Updating downdelay (to %d) "
+			      "since it is a multiple of the miimon value.\n",
+			      bond->dev->name,
+			      bond->params.downdelay * bond->params.miimon);
+		if (bond->params.arp_interval) {
+			printk(KERN_INFO DRV_NAME
+			       ": %s: MII monitoring cannot be used with "
+			       "ARP monitoring. Disabling ARP monitoring...\n",
+			       bond->dev->name);
+			bond->params.arp_interval = 0;
+			/* Kill ARP timer, else it brings bond's link down */
+			if (bond->mii_timer.function) {
+				printk(KERN_INFO DRV_NAME
+				": %s: Kill ARP timer, else it brings bond's link down...\n",
+			       bond->dev->name);
+				del_timer_sync(&bond->arp_timer);
+			}
+		}
+
+		if (bond->dev->flags & IFF_UP) {
+			/* If the interface is up, we may need to fire off
+			 * the MII timer. If the interface is down, the
+			 * timer will get fired off when the open function
+			 * is called.
+			 */
+			if (bond->mii_timer.function) {
+				/* The timer's already set up, so fire it off */
+				mod_timer(&bond->mii_timer, jiffies + 1);
+			} else {
+				/* Set up the timer. */
+				init_timer(&bond->mii_timer);
+				bond->mii_timer.expires = jiffies + 1;
+				bond->mii_timer.data =
+					(unsigned long) bond->dev;
+				bond->mii_timer.function =
+					(void *) &bond_mii_monitor;
+				add_timer(&bond->mii_timer);
+			}
+		}
+	}
+out:
+	return ret;
+}
+static CLASS_DEVICE_ATTR(miimon, S_IRUGO | S_IWUSR, bonding_show_miimon, bonding_store_miimon);
+
+/*
+ * Show and set the primary slave.  The store function is much
+ * simpler than bonding_store_slaves function because it only needs to
+ * handle one interface name.
+ * The bond must be a mode that supports a primary for this be
+ * set.
+ */
+static ssize_t bonding_show_primary(struct class_device *cd, char *buf)
+{
+	int count = 0;
+	struct bonding *bond = to_bond(cd);
+
+	if (bond->primary_slave)
+		count = sprintf(buf, "%s\n", bond->primary_slave->dev->name) + 1;
+	else
+		count = sprintf(buf, "\n") + 1;
+
+	return count;
+}
+
+static ssize_t bonding_store_primary(struct class_device *cd, const char *buf, size_t count)
+{
+	int i;
+	struct slave *slave;
+	struct bonding *bond = to_bond(cd);
+
+	write_lock_bh(&bond->lock);
+	if (!USES_PRIMARY(bond->params.mode)) {
+		printk(KERN_INFO DRV_NAME
+		       ": %s: Unable to set primary slave; %s is in mode %d\n",
+		       bond->dev->name, bond->dev->name, bond->params.mode);
+	} else {
+		bond_for_each_slave(bond, slave, i) {
+			if (strnicmp
+			    (slave->dev->name, buf,
+			     strlen(slave->dev->name)) == 0) {
+				printk(KERN_INFO DRV_NAME
+				       ": %s: Setting %s as primary slave.\n",
+				       bond->dev->name, slave->dev->name);
+				bond->primary_slave = slave;
+				bond_select_active_slave(bond);
+				goto out;
+			}
+		}
+
+		/* if we got here, then we didn't match the name of any slave */
+
+		if (strlen(buf) == 0 || buf[0] == '\n') {
+			printk(KERN_INFO DRV_NAME
+			       ": %s: Setting primary slave to None.\n",
+			       bond->dev->name);
+			bond->primary_slave = 0;
+				bond_select_active_slave(bond);
+		} else {
+			printk(KERN_INFO DRV_NAME
+			       ": %s: Unable to set %.*s as primary slave as it is not a slave.\n",
+			       bond->dev->name, (int)strlen(buf) - 1, buf);
+		}
+	}
+out:
+	write_unlock_bh(&bond->lock);
+	return count;
+}
+static CLASS_DEVICE_ATTR(primary, S_IRUGO | S_IWUSR, bonding_show_primary, bonding_store_primary);
+
+/*
+ * Show and set the use_carrier flag.
+ */
+static ssize_t bonding_show_carrier(struct class_device *cd, char *buf)
+{
+	struct bonding *bond = to_bond(cd);
+
+	return sprintf(buf, "%d\n", bond->params.use_carrier) + 1;
+}
+
+static ssize_t bonding_store_carrier(struct class_device *cd, const char *buf, size_t count)
+{
+	int new_value, ret = count;
+	struct bonding *bond = to_bond(cd);
+
+
+	if (sscanf(buf, "%d", &new_value) != 1) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: no use_carrier value specified.\n",
+		       bond->dev->name);
+		ret = -EINVAL;
+		goto out;
+	}
+	if ((new_value == 0) || (new_value == 1)) {
+		bond->params.use_carrier = new_value;
+		printk(KERN_INFO DRV_NAME ": %s: Setting use_carrier to %d.\n",
+		       bond->dev->name, new_value);
+	} else {
+		printk(KERN_INFO DRV_NAME
+		       ": %s: Ignoring invalid use_carrier value %d.\n",
+		       bond->dev->name, new_value);
+	}
+out:
+	return count;
+}
+static CLASS_DEVICE_ATTR(use_carrier, S_IRUGO | S_IWUSR, bonding_show_carrier, bonding_store_carrier);
+
+
+/*
+ * Show and set currently active_slave.
+ */
+static ssize_t bonding_show_active_slave(struct class_device *cd, char *buf)
+{
+	struct slave *curr;
+	struct bonding *bond = to_bond(cd);
+	int count;
+
+
+	read_lock(&bond->curr_slave_lock);
+	curr = bond->curr_active_slave;
+	read_unlock(&bond->curr_slave_lock);
+
+	if (USES_PRIMARY(bond->params.mode) && curr)
+		count = sprintf(buf, "%s\n", curr->dev->name) + 1;
+	else
+		count = sprintf(buf, "\n") + 1;
+	return count;
+}
+
+static ssize_t bonding_store_active_slave(struct class_device *cd, const char *buf, size_t count)
+{
+	int i;
+	struct slave *slave;
+        struct slave *old_active = NULL;
+        struct slave *new_active = NULL;
+	struct bonding *bond = to_bond(cd);
+
+	write_lock_bh(&bond->lock);
+	if (!USES_PRIMARY(bond->params.mode)) {
+		printk(KERN_INFO DRV_NAME
+		       ": %s: Unable to change active slave; %s is in mode %d\n",
+		       bond->dev->name, bond->dev->name, bond->params.mode);
+	} else {
+		bond_for_each_slave(bond, slave, i) {
+			if (strnicmp
+			    (slave->dev->name, buf,
+			     strlen(slave->dev->name)) == 0) {
+        			old_active = bond->curr_active_slave;
+        			new_active = slave;
+        			if (new_active && (new_active == old_active)) {
+					/* do nothing */
+					printk(KERN_INFO DRV_NAME
+				       	       ": %s: %s is already the current active slave.\n",
+				               bond->dev->name, slave->dev->name);
+					goto out;
+				}
+				else {
+        				if ((new_active) &&
+            				    (old_active) &&
+				            (new_active->link == BOND_LINK_UP) &&
+				            IS_UP(new_active->dev)) {
+						printk(KERN_INFO DRV_NAME
+				       	              ": %s: Setting %s as active slave.\n",
+				                      bond->dev->name, slave->dev->name);
+                				bond_change_active_slave(bond, new_active);
+        				}
+					else {
+						printk(KERN_INFO DRV_NAME
+				       	              ": %s: Could not set %s as active slave; "
+						      "either %s is down or the link is down.\n",
+				                      bond->dev->name, slave->dev->name,
+						      slave->dev->name);
+					}
+					goto out;
+				}
+			}
+		}
+
+		/* if we got here, then we didn't match the name of any slave */
+
+		if (strlen(buf) == 0 || buf[0] == '\n') {
+			printk(KERN_INFO DRV_NAME
+			       ": %s: Setting active slave to None.\n",
+			       bond->dev->name);
+			bond->primary_slave = 0;
+				bond_select_active_slave(bond);
+		} else {
+			printk(KERN_INFO DRV_NAME
+			       ": %s: Unable to set %.*s as active slave as it is not a slave.\n",
+			       bond->dev->name, (int)strlen(buf) - 1, buf);
+		}
+	}
+out:
+	write_unlock_bh(&bond->lock);
+	return count;
+
+}
+static CLASS_DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR, bonding_show_active_slave, bonding_store_active_slave);
+
+
+/*
+ * Show link status of the bond interface.
+ */
+static ssize_t bonding_show_mii_status(struct class_device *cd, char *buf)
+{
+	struct slave *curr;
+	struct bonding *bond = to_bond(cd);
+
+	read_lock(&bond->curr_slave_lock);
+	curr = bond->curr_active_slave;
+	read_unlock(&bond->curr_slave_lock);
+
+	return sprintf(buf, "%s\n", (curr) ? "up" : "down") + 1;
+}
+static CLASS_DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
+
+
+/*
+ * Show current 802.3ad aggregator ID.
+ */
+static ssize_t bonding_show_ad_aggregator(struct class_device *cd, char *buf)
+{
+	int count = 0;
+	struct bonding *bond = to_bond(cd);
+
+	if (bond->params.mode == BOND_MODE_8023AD) {
+		struct ad_info ad_info;
+		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.aggregator_id) + 1;
+	}
+	else
+		count = sprintf(buf, "\n") + 1;
+
+	return count;
+}
+static CLASS_DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
+
+
+/*
+ * Show number of active 802.3ad ports.
+ */
+static ssize_t bonding_show_ad_num_ports(struct class_device *cd, char *buf)
+{
+	int count = 0;
+	struct bonding *bond = to_bond(cd);
+
+	if (bond->params.mode == BOND_MODE_8023AD) {
+		struct ad_info ad_info;
+		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0: ad_info.ports) + 1;
+	}
+	else
+		count = sprintf(buf, "\n") + 1;
+
+	return count;
+}
+static CLASS_DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
+
+
+/*
+ * Show current 802.3ad actor key.
+ */
+static ssize_t bonding_show_ad_actor_key(struct class_device *cd, char *buf)
+{
+	int count = 0;
+	struct bonding *bond = to_bond(cd);
+
+	if (bond->params.mode == BOND_MODE_8023AD) {
+		struct ad_info ad_info;
+		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.actor_key) + 1;
+	}
+	else
+		count = sprintf(buf, "\n") + 1;
+
+	return count;
+}
+static CLASS_DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
+
+
+/*
+ * Show current 802.3ad partner key.
+ */
+static ssize_t bonding_show_ad_partner_key(struct class_device *cd, char *buf)
+{
+	int count = 0;
+	struct bonding *bond = to_bond(cd);
+
+	if (bond->params.mode == BOND_MODE_8023AD) {
+		struct ad_info ad_info;
+		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.partner_key) + 1;
+	}
+	else
+		count = sprintf(buf, "\n") + 1;
+
+	return count;
+}
+static CLASS_DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
+
+
+/*
+ * Show current 802.3ad partner mac.
+ */
+static ssize_t bonding_show_ad_partner_mac(struct class_device *cd, char *buf)
+{
+	int count = 0;
+	struct bonding *bond = to_bond(cd);
+
+	if (bond->params.mode == BOND_MODE_8023AD) {
+		struct ad_info ad_info;
+		if (!bond_3ad_get_active_agg_info(bond, &ad_info)) {
+			count = sprintf(buf,"%02x:%02x:%02x:%02x:%02x:%02x\n",
+				       ad_info.partner_system[0],
+				       ad_info.partner_system[1],
+				       ad_info.partner_system[2],
+				       ad_info.partner_system[3],
+				       ad_info.partner_system[4],
+				       ad_info.partner_system[5]) + 1;
+		}
+	}
+	else
+		count = sprintf(buf, "\n") + 1;
+
+	return count;
+}
+static CLASS_DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
+
+
+
+static struct attribute *per_bond_attrs[] = {
+	&class_device_attr_slaves.attr,
+	&class_device_attr_mode.attr,
+	&class_device_attr_arp_interval.attr,
+	&class_device_attr_arp_ip_target.attr,
+	&class_device_attr_downdelay.attr,
+	&class_device_attr_updelay.attr,
+	&class_device_attr_lacp_rate.attr,
+	&class_device_attr_xmit_hash_policy.attr,
+	&class_device_attr_miimon.attr,
+	&class_device_attr_primary.attr,
+	&class_device_attr_use_carrier.attr,
+	&class_device_attr_active_slave.attr,
+	&class_device_attr_mii_status.attr,
+	&class_device_attr_ad_aggregator.attr,
+	&class_device_attr_ad_num_ports.attr,
+	&class_device_attr_ad_actor_key.attr,
+	&class_device_attr_ad_partner_key.attr,
+	&class_device_attr_ad_partner_mac.attr,
+	NULL,
+};
+
+static struct attribute_group bonding_group = {
+	.name = "bonding",
+	.attrs = per_bond_attrs,
+};
+
+/*
+ * Initialize sysfs.  This sets up the bonding_masters file in
+ * /sys/class/net.
+ */
+int bond_create_sysfs(void)
+{
+	int ret = 0;
+	struct bonding *firstbond;
+
+	init_rwsem(&bonding_rwsem);
+
+	/* get the netdev class pointer */
+	firstbond = container_of(bond_dev_list.next, struct bonding, bond_list);
+	if (!firstbond)
+		return -ENODEV;
+
+	netdev_class = firstbond->dev->class_dev.class;
+	if (!netdev_class)
+		return -ENODEV;
+
+	ret = class_create_file(netdev_class, &class_attr_bonding_masters);
+
+	return ret;
+
+}
+
+/*
+ * Remove /sys/class/net/bonding_masters.
+ */
+void bond_destroy_sysfs(void)
+{
+	if (netdev_class)
+		class_remove_file(netdev_class, &class_attr_bonding_masters);
+}
+
+/*
+ * Initialize sysfs for each bond.  This sets up and registers
+ * the 'bondctl' directory for each individual bond under /sys/class/net.
+ */
+int bond_create_sysfs_entry(struct bonding *bond)
+{
+	struct net_device *dev = bond->dev;
+	int err;
+
+	err = sysfs_create_group(&(dev->class_dev.kobj), &bonding_group);
+	if (err) {
+		printk(KERN_EMERG "eek! didn't create group!\n");
+	}
+
+	if (expected_refcount < 1)
+		expected_refcount = atomic_read(&bond->dev->class_dev.kobj.kref.refcount);
+
+	return err;
+}
+/*
+ * Remove sysfs entries for each bond.
+ */
+void bond_destroy_sysfs_entry(struct bonding *bond)
+{
+	struct net_device *dev = bond->dev;
+
+	sysfs_remove_group(&(dev->class_dev.kobj), &bonding_group);
+}
+

drivers/net/bonding/bonding.h

···
 #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"
 
···
 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);