Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 4708 insertions, 0 deletions

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
new file mode 100644
index 00000000000..770e28f98fd
--- /dev/null
+++ b/drivers/net/bonding/bond_main.c
@@ -0,0 +1,4708 @@
+/*
+ * originally based on the dummy device.
+ *
+ * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
+ * Licensed under the GPL. Based on dummy.c, and eql.c devices.
+ *
+ * bonding.c: an Ethernet Bonding driver
+ *
+ * This is useful to talk to a Cisco EtherChannel compatible equipment:
+ *	Cisco 5500
+ *	Sun Trunking (Solaris)
+ *	Alteon AceDirector Trunks
+ *	Linux Bonding
+ *	and probably many L2 switches ...
+ *
+ * How it works:
+ *    ifconfig bond0 ipaddress netmask up
+ *      will setup a network device, with an ip address.  No mac address
+ *	will be assigned at this time.  The hw mac address will come from
+ *	the first slave bonded to the channel.  All slaves will then use
+ *	this hw mac address.
+ *
+ *    ifconfig bond0 down
+ *         will release all slaves, marking them as down.
+ *
+ *    ifenslave bond0 eth0
+ *	will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
+ *	a: be used as initial mac address
+ *	b: if a hw mac address already is there, eth0's hw mac address
+ *	   will then be set from bond0.
+ *
+ * v0.1 - first working version.
+ * v0.2 - changed stats to be calculated by summing slaves stats.
+ *
+ * Changes:
+ * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ * - fix leaks on failure at bond_init
+ *
+ * 2000/09/30 - Willy Tarreau <willy at meta-x.org>
+ *     - added trivial code to release a slave device.
+ *     - fixed security bug (CAP_NET_ADMIN not checked)
+ *     - implemented MII link monitoring to disable dead links :
+ *       All MII capable slaves are checked every <miimon> milliseconds
+ *       (100 ms seems good). This value can be changed by passing it to
+ *       insmod. A value of zero disables the monitoring (default).
+ *     - fixed an infinite loop in bond_xmit_roundrobin() when there's no
+ *       good slave.
+ *     - made the code hopefully SMP safe
+ *
+ * 2000/10/03 - Willy Tarreau <willy at meta-x.org>
+ *     - optimized slave lists based on relevant suggestions from Thomas Davis
+ *     - implemented active-backup method to obtain HA with two switches:
+ *       stay as long as possible on the same active interface, while we
+ *       also monitor the backup one (MII link status) because we want to know
+ *       if we are able to switch at any time. ( pass "mode=1" to insmod )
+ *     - lots of stress testings because we need it to be more robust than the
+ *       wires ! :->
+ *
+ * 2000/10/09 - Willy Tarreau <willy at meta-x.org>
+ *     - added up and down delays after link state change.
+ *     - optimized the slaves chaining so that when we run forward, we never
+ *       repass through the bond itself, but we can find it by searching
+ *       backwards. Renders the deletion more difficult, but accelerates the
+ *       scan.
+ *     - smarter enslaving and releasing.
+ *     - finer and more robust SMP locking
+ *
+ * 2000/10/17 - Willy Tarreau <willy at meta-x.org>
+ *     - fixed two potential SMP race conditions
+ *
+ * 2000/10/18 - Willy Tarreau <willy at meta-x.org>
+ *     - small fixes to the monitoring FSM in case of zero delays
+ * 2000/11/01 - Willy Tarreau <willy at meta-x.org>
+ *     - fixed first slave not automatically used in trunk mode.
+ * 2000/11/10 : spelling of "EtherChannel" corrected.
+ * 2000/11/13 : fixed a race condition in case of concurrent accesses to ioctl().
+ * 2000/12/16 : fixed improper usage of rtnl_exlock_nowait().
+ *
+ * 2001/1/3 - Chad N. Tindel <ctindel at ieee dot org>
+ *     - The bonding driver now simulates MII status monitoring, just like
+ *       a normal network device.  It will show that the link is down iff
+ *       every slave in the bond shows that their links are down.  If at least
+ *       one slave is up, the bond's MII status will appear as up.
+ *
+ * 2001/2/7 - Chad N. Tindel <ctindel at ieee dot org>
+ *     - Applications can now query the bond from user space to get
+ *       information which may be useful.  They do this by calling
+ *       the BOND_INFO_QUERY ioctl.  Once the app knows how many slaves
+ *       are in the bond, it can call the BOND_SLAVE_INFO_QUERY ioctl to
+ *       get slave specific information (# link failures, etc).  See
+ *       <linux/if_bonding.h> for more details.  The structs of interest
+ *       are ifbond and ifslave.
+ *
+ * 2001/4/5 - Chad N. Tindel <ctindel at ieee dot org>
+ *     - Ported to 2.4 Kernel
+ *
+ * 2001/5/2 - Jeffrey E. Mast <jeff at mastfamily dot com>
+ *     - When a device is detached from a bond, the slave device is no longer
+ *       left thinking that is has a master.
+ *
+ * 2001/5/16 - Jeffrey E. Mast <jeff at mastfamily dot com>
+ *     - memset did not appropriately initialized the bond rw_locks. Used
+ *       rwlock_init to initialize to unlocked state to prevent deadlock when
+ *       first attempting a lock
+ *     - Called SET_MODULE_OWNER for bond device
+ *
+ * 2001/5/17 - Tim Anderson <tsa at mvista.com>
+ *     - 2 paths for releasing for slave release; 1 through ioctl
+ *       and 2) through close. Both paths need to release the same way.
+ *     - the free slave in bond release is changing slave status before
+ *       the free. The netdev_set_master() is intended to change slave state
+ *       so it should not be done as part of the release process.
+ *     - Simple rule for slave state at release: only the active in A/B and
+ *       only one in the trunked case.
+ *
+ * 2001/6/01 - Tim Anderson <tsa at mvista.com>
+ *     - Now call dev_close when releasing a slave so it doesn't screw up
+ *       out routing table.
+ *
+ * 2001/6/01 - Chad N. Tindel <ctindel at ieee dot org>
+ *     - Added /proc support for getting bond and slave information.
+ *       Information is in /proc/net/<bond device>/info.
+ *     - Changed the locking when calling bond_close to prevent deadlock.
+ *
+ * 2001/8/05 - Janice Girouard <girouard at us.ibm.com>
+ *     - correct problem where refcnt of slave is not incremented in bond_ioctl
+ *       so the system hangs when halting.
+ *     - correct locking problem when unable to malloc in bond_enslave.
+ *     - adding bond_xmit_xor logic.
+ *     - adding multiple bond device support.
+ *
+ * 2001/8/13 - Erik Habbinga <erik_habbinga at hp dot com>
+ *     - correct locking problem with rtnl_exlock_nowait
+ *
+ * 2001/8/23 - Janice Girouard <girouard at us.ibm.com>
+ *     - bzero initial dev_bonds, to correct oops
+ *     - convert SIOCDEVPRIVATE to new MII ioctl calls
+ *
+ * 2001/9/13 - Takao Indoh <indou dot takao at jp dot fujitsu dot com>
+ *     - Add the BOND_CHANGE_ACTIVE ioctl implementation
+ *
+ * 2001/9/14 - Mark Huth <mhuth at mvista dot com>
+ *     - Change MII_LINK_READY to not check for end of auto-negotiation,
+ *       but only for an up link.
+ *
+ * 2001/9/20 - Chad N. Tindel <ctindel at ieee dot org>
+ *     - Add the device field to bonding_t.  Previously the net_device
+ *       corresponding to a bond wasn't available from the bonding_t
+ *       structure.
+ *
+ * 2001/9/25 - Janice Girouard <girouard at us.ibm.com>
+ *     - add arp_monitor for active backup mode
+ *
+ * 2001/10/23 - Takao Indoh <indou dot takao at jp dot fujitsu dot com>
+ *     - Various memory leak fixes
+ *
+ * 2001/11/5 - Mark Huth <mark dot huth at mvista dot com>
+ *     - Don't take rtnl lock in bond_mii_monitor as it deadlocks under
+ *       certain hotswap conditions.
+ *       Note:  this same change may be required in bond_arp_monitor ???
+ *     - Remove possibility of calling bond_sethwaddr with NULL slave_dev ptr
+ *     - Handle hot swap ethernet interface deregistration events to remove
+ *       kernel oops following hot swap of enslaved interface
+ *
+ * 2002/1/2 - Chad N. Tindel <ctindel at ieee dot org>
+ *     - Restore original slave flags at release time.
+ *
+ * 2002/02/18 - Erik Habbinga <erik_habbinga at hp dot com>
+ *     - bond_release(): calling kfree on our_slave after call to
+ *       bond_restore_slave_flags, not before
+ *     - bond_enslave(): saving slave flags into original_flags before
+ *       call to netdev_set_master, so the IFF_SLAVE flag doesn't end
+ *       up in original_flags
+ *
+ * 2002/04/05 - Mark Smith <mark.smith at comdev dot cc> and
+ *              Steve Mead <steve.mead at comdev dot cc>
+ *     - Port Gleb Natapov's multicast support patchs from 2.4.12
+ *       to 2.4.18 adding support for multicast.
+ *
+ * 2002/06/10 - Tony Cureington <tony.cureington * hp_com>
+ *     - corrected uninitialized pointer (ifr.ifr_data) in bond_check_dev_link;
+ *       actually changed function to use MIIPHY, then MIIREG, and finally
+ *       ETHTOOL to determine the link status
+ *     - fixed bad ifr_data pointer assignments in bond_ioctl
+ *     - corrected mode 1 being reported as active-backup in bond_get_info;
+ *       also added text to distinguish type of load balancing (rr or xor)
+ *     - change arp_ip_target module param from "1-12s" (array of 12 ptrs)
+ *       to "s" (a single ptr)
+ *
+ * 2002/08/30 - Jay Vosburgh <fubar at us dot ibm dot com>
+ *     - Removed acquisition of xmit_lock in set_multicast_list; caused
+ *       deadlock on SMP (lock is held by caller).
+ *     - Revamped SIOCGMIIPHY, SIOCGMIIREG portion of bond_check_dev_link().
+ *
+ * 2002/09/18 - Jay Vosburgh <fubar at us dot ibm dot com>
+ *     - Fixed up bond_check_dev_link() (and callers): removed some magic
+ *	 numbers, banished local MII_ defines, wrapped ioctl calls to
+ *	 prevent EFAULT errors
+ *
+ * 2002/9/30 - Jay Vosburgh <fubar at us dot ibm dot com>
+ *     - make sure the ip target matches the arp_target before saving the
+ *	 hw address.
+ *
+ * 2002/9/30 - Dan Eisner <eisner at 2robots dot com>
+ *     - make sure my_ip is set before taking down the link, since
+ *	 not all switches respond if the source ip is not set.
+ *
+ * 2002/10/8 - Janice Girouard <girouard at us dot ibm dot com>
+ *     - read in the local ip address when enslaving a device
+ *     - add primary support
+ *     - make sure 2*arp_interval has passed when a new device
+ *       is brought on-line before taking it down.
+ *
+ * 2002/09/11 - Philippe De Muyter <phdm at macqel dot be>
+ *     - Added bond_xmit_broadcast logic.
+ *     - Added bond_mode() support function.
+ *
+ * 2002/10/26 - Laurent Deniel <laurent.deniel at free.fr>
+ *     - allow to register multicast addresses only on active slave
+ *       (useful in active-backup mode)
+ *     - add multicast module parameter
+ *     - fix deletion of multicast groups after unloading module
+ *
+ * 2002/11/06 - Kameshwara Rayaprolu <kameshwara.rao * wipro_com>
+ *     - Changes to prevent panic from closing the device twice; if we close
+ *       the device in bond_release, we must set the original_flags to down
+ *       so it won't be closed again by the network layer.
+ *
+ * 2002/11/07 - Tony Cureington <tony.cureington * hp_com>
+ *     - Fix arp_target_hw_addr memory leak
+ *     - Created activebackup_arp_monitor function to handle arp monitoring
+ *       in active backup mode - the bond_arp_monitor had several problems...
+ *       such as allowing slaves to tx arps sequentially without any delay
+ *       for a response
+ *     - Renamed bond_arp_monitor to loadbalance_arp_monitor and re-wrote
+ *       this function to just handle arp monitoring in load-balancing mode;
+ *       it is a lot more compact now
+ *     - Changes to ensure one and only one slave transmits in active-backup
+ *       mode
+ *     - Robustesize parameters; warn users about bad combinations of
+ *       parameters; also if miimon is specified and a network driver does
+ *       not support MII or ETHTOOL, inform the user of this
+ *     - Changes to support link_failure_count when in arp monitoring mode
+ *     - Fix up/down delay reported in /proc
+ *     - Added version; log version; make version available from "modinfo -d"
+ *     - Fixed problem in bond_check_dev_link - if the first IOCTL (SIOCGMIIPH)
+ *	 failed, the ETHTOOL ioctl never got a chance
+ *
+ * 2002/11/16 - Laurent Deniel <laurent.deniel at free.fr>
+ *     - fix multicast handling in activebackup_arp_monitor
+ *     - remove one unnecessary and confusing curr_active_slave == slave test
+ *	 in activebackup_arp_monitor
+ *
+ *  2002/11/17 - Laurent Deniel <laurent.deniel at free.fr>
+ *     - fix bond_slave_info_query when slave_id = num_slaves
+ *
+ *  2002/11/19 - Janice Girouard <girouard at us dot ibm dot com>
+ *     - correct ifr_data reference.  Update ifr_data reference
+ *       to mii_ioctl_data struct values to avoid confusion.
+ *
+ *  2002/11/22 - Bert Barbe <bert.barbe at oracle dot com>
+ *      - Add support for multiple arp_ip_target
+ *
+ *  2002/12/13 - Jay Vosburgh <fubar at us dot ibm dot com>
+ *	- Changed to allow text strings for mode and multicast, e.g.,
+ *	  insmod bonding mode=active-backup.  The numbers still work.
+ *	  One change: an invalid choice will cause module load failure,
+ *	  rather than the previous behavior of just picking one.
+ *	- Minor cleanups; got rid of dup ctype stuff, atoi function
+ *
+ * 2003/02/07 - Jay Vosburgh <fubar at us dot ibm dot com>
+ *	- Added use_carrier module parameter that causes miimon to
+ *	  use netif_carrier_ok() test instead of MII/ETHTOOL ioctls.
+ *	- Minor cleanups; consolidated ioctl calls to one function.
+ *
+ * 2003/02/07 - Tony Cureington <tony.cureington * hp_com>
+ *	- Fix bond_mii_monitor() logic error that could result in
+ *	  bonding round-robin mode ignoring links after failover/recovery
+ *
+ * 2003/03/17 - Jay Vosburgh <fubar at us dot ibm dot com>
+ *	- kmalloc fix (GFP_KERNEL to GFP_ATOMIC) reported by
+ *	  Shmulik dot Hen at intel.com.
+ *	- Based on discussion on mailing list, changed use of
+ *	  update_slave_cnt(), created wrapper functions for adding/removing
+ *	  slaves, changed bond_xmit_xor() to check slave_cnt instead of
+ *	  checking slave and slave->dev (which only worked by accident).
+ *	- Misc code cleanup: get arp_send() prototype from header file,
+ *	  add max_bonds to bonding.txt.
+ *
+ * 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and
+ *		Shmulik Hen <shmulik.hen at intel dot com>
+ *	- Make sure only bond_attach_slave() and bond_detach_slave() can
+ *	  manipulate the slave list, including slave_cnt, even when in
+ *	  bond_release_all().
+ *	- Fixed hang in bond_release() with traffic running:
+ *	  netdev_set_master() must not be called from within the bond lock.
+ *
+ * 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and
+ *		Shmulik Hen <shmulik.hen at intel dot com>
+ *	- Fixed hang in bond_enslave() with traffic running:
+ *	  netdev_set_master() must not be called from within the bond lock.
+ *
+ * 2003/03/18 - Amir Noam <amir.noam at intel dot com>
+ *	- Added support for getting slave's speed and duplex via ethtool.
+ *	  Needed for 802.3ad and other future modes.
+ *
+ * 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and
+ *		Shmulik Hen <shmulik.hen at intel dot com>
+ *	- Enable support of modes that need to use the unique mac address of
+ *	  each slave.
+ *	  * bond_enslave(): Moved setting the slave's mac address, and
+ *	    openning it, from the application to the driver. This breaks
+ *	    backward comaptibility with old versions of ifenslave that open
+ *	     the slave before enalsving it !!!.
+ *	  * bond_release(): The driver also takes care of closing the slave
+ *	    and restoring its original mac address.
+ *	- Removed the code that restores all base driver's flags.
+ *	  Flags are automatically restored once all undo stages are done
+ *	  properly.
+ *	- Block possibility of enslaving before the master is up. This
+ *	  prevents putting the system in an unstable state.
+ *
+ * 2003/03/18 - Amir Noam <amir.noam at intel dot com>,
+ *		Tsippy Mendelson <tsippy.mendelson at intel dot com> and
+ *		Shmulik Hen <shmulik.hen at intel dot com>
+ *	- Added support for IEEE 802.3ad Dynamic link aggregation mode.
+ *
+ * 2003/05/01 - Amir Noam <amir.noam at intel dot com>
+ *	- Added ABI version control to restore compatibility between
+ *	  new/old ifenslave and new/old bonding.
+ *
+ * 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com>
+ *	- Fixed bug in bond_release_all(): save old value of curr_active_slave
+ *	  before setting it to NULL.
+ *	- Changed driver versioning scheme to include version number instead
+ *	  of release date (that is already in another field). There are 3
+ *	  fields X.Y.Z where:
+ *		X - Major version - big behavior changes
+ *		Y - Minor version - addition of features
+ *		Z - Extra version - minor changes and bug fixes
+ *	  The current version is 1.0.0 as a base line.
+ *
+ * 2003/05/01 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and
+ *		Amir Noam <amir.noam at intel dot com>
+ *	- Added support for lacp_rate module param.
+ *	- Code beautification and style changes (mainly in comments).
+ *	  new version - 1.0.1
+ *
+ * 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com>
+ *	- Based on discussion on mailing list, changed locking scheme
+ *	  to use lock/unlock or lock_bh/unlock_bh appropriately instead
+ *	  of lock_irqsave/unlock_irqrestore. The new scheme helps exposing
+ *	  hidden bugs and solves system hangs that occurred due to the fact
+ *	  that holding lock_irqsave doesn't prevent softirqs from running.
+ *	  This also increases total throughput since interrupts are not
+ *	  blocked on each transmitted packets or monitor timeout.
+ *	  new version - 2.0.0
+ *
+ * 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com>
+ *	- Added support for Transmit load balancing mode.
+ *	- Concentrate all assignments of curr_active_slave to a single point
+ *	  so specific modes can take actions when the primary adapter is
+ *	  changed.
+ *	- Take the updelay parameter into consideration during bond_enslave
+ *	  since some adapters loose their link during setting the device.
+ *	- Renamed bond_3ad_link_status_changed() to
+ *	  bond_3ad_handle_link_change() for compatibility with TLB.
+ *	  new version - 2.1.0
+ *
+ * 2003/05/01 - Tsippy Mendelson <tsippy.mendelson at intel dot com>
+ *	- Added support for Adaptive load balancing mode which is
+ *	  equivalent to Transmit load balancing + Receive load balancing.
+ *	  new version - 2.2.0
+ *
+ * 2003/05/15 - Jay Vosburgh <fubar at us dot ibm dot com>
+ *	- Applied fix to activebackup_arp_monitor posted to bonding-devel
+ *	  by Tony Cureington <tony.cureington * hp_com>.  Fixes ARP
+ *	  monitor endless failover bug.  Version to 2.2.10
+ *
+ * 2003/05/20 - Amir Noam <amir.noam at intel dot com>
+ *	- Fixed bug in ABI version control - Don't commit to a specific
+ *	  ABI version if receiving unsupported ioctl commands.
+ *
+ * 2003/05/22 - Jay Vosburgh <fubar at us dot ibm dot com>
+ *	- Fix ifenslave -c causing bond to loose existing routes;
+ *	  added bond_set_mac_address() that doesn't require the
+ *	  bond to be down.
+ *	- In conjunction with fix for ifenslave -c, in
+ *	  bond_change_active(), changing to the already active slave
+ *	  is no longer an error (it successfully does nothing).
+ *
+ * 2003/06/30 - Amir Noam <amir.noam at intel dot com>
+ * 	- Fixed bond_change_active() for ALB/TLB modes.
+ *	  Version to 2.2.14.
+ *
+ * 2003/07/29 - Amir Noam <amir.noam at intel dot com>
+ * 	- Fixed ARP monitoring bug.
+ *	  Version to 2.2.15.
+ *
+ * 2003/07/31 - Willy Tarreau <willy at ods dot org>
+ * 	- Fixed kernel panic when using ARP monitoring without
+ *	  setting bond's IP address.
+ *	  Version to 2.2.16.
+ *
+ * 2003/08/06 - Amir Noam <amir.noam at intel dot com>
+ * 	- Back port from 2.6: use alloc_netdev(); fix /proc handling;
+ *	  made stats a part of bond struct so no need to allocate
+ *	  and free it separately; use standard list operations instead
+ *	  of pre-allocated array of bonds.
+ *	  Version to 2.3.0.
+ *
+ * 2003/08/07 - Jay Vosburgh <fubar at us dot ibm dot com>,
+ *	       Amir Noam <amir.noam at intel dot com> and
+ *	       Shmulik Hen <shmulik.hen at intel dot com>
+ *	- Propagating master's settings: Distinguish between modes that
+ *	  use a primary slave from those that don't, and propagate settings
+ *	  accordingly; Consolidate change_active opeartions and add
+ *	  reselect_active and find_best opeartions; Decouple promiscuous
+ *	  handling from the multicast mode setting; Add support for changing
+ *	  HW address and MTU with proper unwind; Consolidate procfs code,
+ *	  add CHANGENAME handler; Enhance netdev notification handling.
+ *	  Version to 2.4.0.
+ *
+ * 2003/09/15 - Stephen Hemminger <shemminger at osdl dot org>,
+ *	       Amir Noam <amir.noam at intel dot com>
+ *	- Convert /proc to seq_file interface.
+ *	  Change /proc/net/bondX/info to /proc/net/bonding/bondX.
+ *	  Set version to 2.4.1.
+ *
+ * 2003/11/20 - Amir Noam <amir.noam at intel dot com>
+ *	- Fix /proc creation/destruction.
+ *
+ * 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com>
+ *	- Massive cleanup - Set version to 2.5.0
+ *	  Code changes:
+ *	  o Consolidate format of prints and debug prints.
+ *	  o Remove bonding_t/slave_t typedefs and consolidate all casts.
+ *	  o Remove dead code and unnecessary checks.
+ *	  o Consolidate starting/stopping timers.
+ *	  o Consolidate handling of primary module param throughout the code.
+ *	  o Removed multicast module param support - all settings are done
+ *	    according to mode.
+ *	  o Slave list iteration - bond is no longer part of the list,
+ *	    added cyclic list iteration macros.
+ *	  o Consolidate error handling in all xmit functions.
+ *	  Style changes:
+ *	  o Consolidate function naming and declarations.
+ *	  o Consolidate function params and local variables names.
+ *	  o Consolidate return values.
+ *	  o Consolidate curly braces.
+ *	  o Consolidate conditionals format.
+ *	  o Change struct member names and types.
+ *	  o Chomp trailing spaces, remove empty lines, fix indentations.
+ *	  o Re-organize code according to context.
+ *
+ * 2003/12/30 - Amir Noam <amir.noam at intel dot com>
+ *	- Fixed: Cannot remove and re-enslave the original active slave.
+ *	- Fixed: Releasing the original active slave causes mac address
+ *		 duplication.
+ *	- Add support for slaves that use ethtool_ops.
+ *	  Set version to 2.5.3.
+ *
+ * 2004/01/05 - Amir Noam <amir.noam at intel dot com>
+ *	- Save bonding parameters per bond instead of using the global values.
+ *	  Set version to 2.5.4.
+ *
+ * 2004/01/14 - Shmulik Hen <shmulik.hen at intel dot com>
+ *	- Enhance VLAN support:
+ *	  * Add support for VLAN hardware acceleration capable slaves.
+ *	  * Add capability to tag self generated packets in ALB/TLB modes.
+ *	  Set version to 2.6.0.
+ * 2004/10/29 - Mitch Williams <mitch.a.williams at intel dot com>
+ *      - Fixed bug when unloading module while using 802.3ad.  If
+ *        spinlock debugging is turned on, this causes a stack dump.
+ *        Solution is to move call to dev_remove_pack outside of the
+ *        spinlock.
+ *        Set version to 2.6.1.
+ *
+ */
+
+//#define BONDING_DEBUG 1
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/socket.h>
+#include <linux/ctype.h>
+#include <linux/inet.h>
+#include <linux/bitops.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/uaccess.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <linux/rtnetlink.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/smp.h>
+#include <linux/if_ether.h>
+#include <net/arp.h>
+#include <linux/mii.h>
+#include <linux/ethtool.h>
+#include <linux/if_vlan.h>
+#include <linux/if_bonding.h>
+#include "bonding.h"
+#include "bond_3ad.h"
+#include "bond_alb.h"
+
+/*---------------------------- Module parameters ----------------------------*/
+
+/* monitor all links that often (in milliseconds). <=0 disables monitoring */
+#define BOND_LINK_MON_INTERV	0
+#define BOND_LINK_ARP_INTERV	0
+
+static int max_bonds	= BOND_DEFAULT_MAX_BONDS;
+static int miimon	= BOND_LINK_MON_INTERV;
+static int updelay	= 0;
+static int downdelay	= 0;
+static int use_carrier	= 1;
+static char *mode	= NULL;
+static char *primary	= NULL;
+static char *lacp_rate	= NULL;
+static int arp_interval = BOND_LINK_ARP_INTERV;
+static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
+
+module_param(max_bonds, int, 0);
+MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
+module_param(miimon, int, 0);
+MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
+module_param(updelay, int, 0);
+MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
+module_param(downdelay, int, 0);
+MODULE_PARM_DESC(downdelay, "Delay before considering link down, in milliseconds");
+module_param(use_carrier, int, 0);
+MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; 0 for off, 1 for on (default)");
+module_param(mode, charp, 0);
+MODULE_PARM_DESC(mode, "Mode of operation : 0 for round robin, 1 for active-backup, 2 for xor");
+module_param(primary, charp, 0);
+MODULE_PARM_DESC(primary, "Primary network device to use");
+module_param(lacp_rate, charp, 0);
+MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner (slow/fast)");
+module_param(arp_interval, int, 0);
+MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
+module_param_array(arp_ip_target, charp, NULL, 0);
+MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
+
+/*----------------------------- Global variables ----------------------------*/
+
+static const char *version =
+	DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
+
+static LIST_HEAD(bond_dev_list);
+
+#ifdef CONFIG_PROC_FS
+static struct proc_dir_entry *bond_proc_dir = NULL;
+#endif
+
+static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
+static int arp_ip_count	= 0;
+static u32 my_ip	= 0;
+static int bond_mode	= BOND_MODE_ROUNDROBIN;
+static int lacp_fast	= 0;
+static int app_abi_ver	= 0;
+static int orig_app_abi_ver = -1; /* This is used to save the first ABI version
+				   * we receive from the application. Once set,
+				   * it won't be changed, and the module will
+				   * refuse to enslave/release interfaces if the
+				   * command comes from an application using
+				   * another ABI version.
+				   */
+
+struct bond_parm_tbl {
+	char *modename;
+	int mode;
+};
+
+static struct bond_parm_tbl bond_lacp_tbl[] = {
+{	"slow",		AD_LACP_SLOW},
+{	"fast",		AD_LACP_FAST},
+{	NULL,		-1},
+};
+
+static struct bond_parm_tbl bond_mode_tbl[] = {
+{	"balance-rr",		BOND_MODE_ROUNDROBIN},
+{	"active-backup",	BOND_MODE_ACTIVEBACKUP},
+{	"balance-xor",		BOND_MODE_XOR},
+{	"broadcast",		BOND_MODE_BROADCAST},
+{	"802.3ad",		BOND_MODE_8023AD},
+{	"balance-tlb",		BOND_MODE_TLB},
+{	"balance-alb",		BOND_MODE_ALB},
+{	NULL,			-1},
+};
+
+/*-------------------------- Forward declarations ---------------------------*/
+
+static inline void bond_set_mode_ops(struct net_device *bond_dev, int mode);
+
+/*---------------------------- General routines -----------------------------*/
+
+static const char *bond_mode_name(int mode)
+{
+	switch (mode) {
+	case BOND_MODE_ROUNDROBIN :
+		return "load balancing (round-robin)";
+	case BOND_MODE_ACTIVEBACKUP :
+		return "fault-tolerance (active-backup)";
+	case BOND_MODE_XOR :
+		return "load balancing (xor)";
+	case BOND_MODE_BROADCAST :
+		return "fault-tolerance (broadcast)";
+	case BOND_MODE_8023AD:
+		return "IEEE 802.3ad Dynamic link aggregation";
+	case BOND_MODE_TLB:
+		return "transmit load balancing";
+	case BOND_MODE_ALB:
+		return "adaptive load balancing";
+	default:
+		return "unknown";
+	}
+}
+
+/*---------------------------------- VLAN -----------------------------------*/
+
+/**
+ * bond_add_vlan - add a new vlan id on bond
+ * @bond: bond that got the notification
+ * @vlan_id: the vlan id to add
+ *
+ * Returns -ENOMEM if allocation failed.
+ */
+static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
+{
+	struct vlan_entry *vlan;
+
+	dprintk("bond: %s, vlan id %d\n",
+		(bond ? bond->dev->name: "None"), vlan_id);
+
+	vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
+	if (!vlan) {
+		return -ENOMEM;
+	}
+
+	INIT_LIST_HEAD(&vlan->vlan_list);
+	vlan->vlan_id = vlan_id;
+
+	write_lock_bh(&bond->lock);
+
+	list_add_tail(&vlan->vlan_list, &bond->vlan_list);
+
+	write_unlock_bh(&bond->lock);
+
+	dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
+
+	return 0;
+}
+
+/**
+ * bond_del_vlan - delete a vlan id from bond
+ * @bond: bond that got the notification
+ * @vlan_id: the vlan id to delete
+ *
+ * returns -ENODEV if @vlan_id was not found in @bond.
+ */
+static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
+{
+	struct vlan_entry *vlan, *next;
+	int res = -ENODEV;
+
+	dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
+
+	write_lock_bh(&bond->lock);
+
+	list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) {
+		if (vlan->vlan_id == vlan_id) {
+			list_del(&vlan->vlan_list);
+
+			if ((bond->params.mode == BOND_MODE_TLB) ||
+			    (bond->params.mode == BOND_MODE_ALB)) {
+				bond_alb_clear_vlan(bond, vlan_id);
+			}
+
+			dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
+				bond->dev->name);
+
+			kfree(vlan);
+
+			if (list_empty(&bond->vlan_list) &&
+			    (bond->slave_cnt == 0)) {
+				/* Last VLAN removed and no slaves, so
+				 * restore block on adding VLANs. This will
+				 * be removed once new slaves that are not
+				 * VLAN challenged will be added.
+				 */
+				bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
+			}
+
+			res = 0;
+			goto out;
+		}
+	}
+
+	dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
+		bond->dev->name);
+
+out:
+	write_unlock_bh(&bond->lock);
+	return res;
+}
+
+/**
+ * bond_has_challenged_slaves
+ * @bond: the bond we're working on
+ *
+ * Searches the slave list. Returns 1 if a vlan challenged slave
+ * was found, 0 otherwise.
+ *
+ * Assumes bond->lock is held.
+ */
+static int bond_has_challenged_slaves(struct bonding *bond)
+{
+	struct slave *slave;
+	int i;
+
+	bond_for_each_slave(bond, slave, i) {
+		if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
+			dprintk("found VLAN challenged slave - %s\n",
+				slave->dev->name);
+			return 1;
+		}
+	}
+
+	dprintk("no VLAN challenged slaves found\n");
+	return 0;
+}
+
+/**
+ * bond_next_vlan - safely skip to the next item in the vlans list.
+ * @bond: the bond we're working on
+ * @curr: item we're advancing from
+ *
+ * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
+ * or @curr->next otherwise (even if it is @curr itself again).
+ * 
+ * Caller must hold bond->lock
+ */
+struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
+{
+	struct vlan_entry *next, *last;
+
+	if (list_empty(&bond->vlan_list)) {
+		return NULL;
+	}
+
+	if (!curr) {
+		next = list_entry(bond->vlan_list.next,
+				  struct vlan_entry, vlan_list);
+	} else {
+		last = list_entry(bond->vlan_list.prev,
+				  struct vlan_entry, vlan_list);
+		if (last == curr) {
+			next = list_entry(bond->vlan_list.next,
+					  struct vlan_entry, vlan_list);
+		} else {
+			next = list_entry(curr->vlan_list.next,
+					  struct vlan_entry, vlan_list);
+		}
+	}
+
+	return next;
+}
+
+/**
+ * bond_dev_queue_xmit - Prepare skb for xmit.
+ * 
+ * @bond: bond device that got this skb for tx.
+ * @skb: hw accel VLAN tagged skb to transmit
+ * @slave_dev: slave that is supposed to xmit this skbuff
+ * 
+ * When the bond gets an skb to transmit that is
+ * already hardware accelerated VLAN tagged, and it
+ * needs to relay this skb to a slave that is not
+ * hw accel capable, the skb needs to be "unaccelerated",
+ * i.e. strip the hwaccel tag and re-insert it as part
+ * of the payload.
+ */
+int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
+{
+	unsigned short vlan_id;
+
+	if (!list_empty(&bond->vlan_list) &&
+	    !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
+	    vlan_get_tag(skb, &vlan_id) == 0) {
+		skb->dev = slave_dev;
+		skb = vlan_put_tag(skb, vlan_id);
+		if (!skb) {
+			/* vlan_put_tag() frees the skb in case of error,
+			 * so return success here so the calling functions
+			 * won't attempt to free is again.
+			 */
+			return 0;
+		}
+	} else {
+		skb->dev = slave_dev;
+	}
+
+	skb->priority = 1;
+	dev_queue_xmit(skb);
+
+	return 0;
+}
+
+/*
+ * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
+ * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
+ * lock because:
+ * a. This operation is performed in IOCTL context,
+ * b. The operation is protected by the RTNL semaphore in the 8021q code,
+ * c. Holding a lock with BH disabled while directly calling a base driver
+ *    entry point is generally a BAD idea.
+ * 
+ * The design of synchronization/protection for this operation in the 8021q
+ * module is good for one or more VLAN devices over a single physical device
+ * and cannot be extended for a teaming solution like bonding, so there is a
+ * potential race condition here where a net device from the vlan group might
+ * be referenced (either by a base driver or the 8021q code) while it is being
+ * removed from the system. However, it turns out we're not making matters
+ * worse, and if it works for regular VLAN usage it will work here too.
+*/
+
+/**
+ * bond_vlan_rx_register - Propagates registration to slaves
+ * @bond_dev: bonding net device that got called
+ * @grp: vlan group being registered
+ */
+static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct slave *slave;
+	int i;
+
+	bond->vlgrp = grp;
+
+	bond_for_each_slave(bond, slave, i) {
+		struct net_device *slave_dev = slave->dev;
+
+		if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
+		    slave_dev->vlan_rx_register) {
+			slave_dev->vlan_rx_register(slave_dev, grp);
+		}
+	}
+}
+
+/**
+ * bond_vlan_rx_add_vid - Propagates adding an id to slaves
+ * @bond_dev: bonding net device that got called
+ * @vid: vlan id being added
+ */
+static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct slave *slave;
+	int i, res;
+
+	bond_for_each_slave(bond, slave, i) {
+		struct net_device *slave_dev = slave->dev;
+
+		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
+		    slave_dev->vlan_rx_add_vid) {
+			slave_dev->vlan_rx_add_vid(slave_dev, vid);
+		}
+	}
+
+	res = bond_add_vlan(bond, vid);
+	if (res) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Failed to add vlan id %d\n",
+		       bond_dev->name, vid);
+	}
+}
+
+/**
+ * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
+ * @bond_dev: bonding net device that got called
+ * @vid: vlan id being removed
+ */
+static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct slave *slave;
+	struct net_device *vlan_dev;
+	int i, res;
+
+	bond_for_each_slave(bond, slave, i) {
+		struct net_device *slave_dev = slave->dev;
+
+		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
+		    slave_dev->vlan_rx_kill_vid) {
+			/* Save and then restore vlan_dev in the grp array,
+			 * since the slave's driver might clear it.
+			 */
+			vlan_dev = bond->vlgrp->vlan_devices[vid];
+			slave_dev->vlan_rx_kill_vid(slave_dev, vid);
+			bond->vlgrp->vlan_devices[vid] = vlan_dev;
+		}
+	}
+
+	res = bond_del_vlan(bond, vid);
+	if (res) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Failed to remove vlan id %d\n",
+		       bond_dev->name, vid);
+	}
+}
+
+static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
+{
+	struct vlan_entry *vlan;
+
+	write_lock_bh(&bond->lock);
+
+	if (list_empty(&bond->vlan_list)) {
+		goto out;
+	}
+
+	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
+	    slave_dev->vlan_rx_register) {
+		slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
+	}
+
+	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
+	    !(slave_dev->vlan_rx_add_vid)) {
+		goto out;
+	}
+
+	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
+		slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
+	}
+
+out:
+	write_unlock_bh(&bond->lock);
+}
+
+static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
+{
+	struct vlan_entry *vlan;
+	struct net_device *vlan_dev;
+
+	write_lock_bh(&bond->lock);
+
+	if (list_empty(&bond->vlan_list)) {
+		goto out;
+	}
+
+	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
+	    !(slave_dev->vlan_rx_kill_vid)) {
+		goto unreg;
+	}
+
+	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
+		/* Save and then restore vlan_dev in the grp array,
+		 * since the slave's driver might clear it.
+		 */
+		vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
+		slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
+		bond->vlgrp->vlan_devices[vlan->vlan_id] = vlan_dev;
+	}
+
+unreg:
+	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
+	    slave_dev->vlan_rx_register) {
+		slave_dev->vlan_rx_register(slave_dev, NULL);
+	}
+
+out:
+	write_unlock_bh(&bond->lock);
+}
+
+/*------------------------------- Link status -------------------------------*/
+
+/*
+ * 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
+ * and return error.
+ */
+static int bond_update_speed_duplex(struct slave *slave)
+{
+	struct net_device *slave_dev = slave->dev;
+	static int (* ioctl)(struct net_device *, struct ifreq *, int);
+	struct ifreq ifr;
+	struct ethtool_cmd etool;
+
+	/* Fake speed and duplex */
+	slave->speed = SPEED_100;
+	slave->duplex = DUPLEX_FULL;
+
+	if (slave_dev->ethtool_ops) {
+		u32 res;
+
+		if (!slave_dev->ethtool_ops->get_settings) {
+			return -1;
+		}
+
+		res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
+		if (res < 0) {
+			return -1;
+		}
+
+		goto verify;
+	}
+
+	ioctl = slave_dev->do_ioctl;
+	strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
+	etool.cmd = ETHTOOL_GSET;
+	ifr.ifr_data = (char*)&etool;
+	if (!ioctl || (IOCTL(slave_dev, &ifr, SIOCETHTOOL) < 0)) {
+		return -1;
+	}
+
+verify:
+	switch (etool.speed) {
+	case SPEED_10:
+	case SPEED_100:
+	case SPEED_1000:
+		break;
+	default:
+		return -1;
+	}
+
+	switch (etool.duplex) {
+	case DUPLEX_FULL:
+	case DUPLEX_HALF:
+		break;
+	default:
+		return -1;
+	}
+
+	slave->speed = etool.speed;
+	slave->duplex = etool.duplex;
+
+	return 0;
+}
+
+/*
+ * if <dev> supports MII link status reporting, check its link status.
+ *
+ * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
+ * depening upon the setting of the use_carrier parameter.
+ *
+ * Return either BMSR_LSTATUS, meaning that the link is up (or we
+ * can't tell and just pretend it is), or 0, meaning that the link is
+ * down.
+ *
+ * If reporting is non-zero, instead of faking link up, return -1 if
+ * both ETHTOOL and MII ioctls fail (meaning the device does not
+ * support them).  If use_carrier is set, return whatever it says.
+ * It'd be nice if there was a good way to tell if a driver supports
+ * netif_carrier, but there really isn't.
+ */
+static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
+{
+	static int (* ioctl)(struct net_device *, struct ifreq *, int);
+	struct ifreq ifr;
+	struct mii_ioctl_data *mii;
+	struct ethtool_value etool;
+
+	if (bond->params.use_carrier) {
+		return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
+	}
+
+	ioctl = slave_dev->do_ioctl;
+	if (ioctl) {
+		/* TODO: set pointer to correct ioctl on a per team member */
+		/*       bases to make this more efficient. that is, once  */
+		/*       we determine the correct ioctl, we will always    */
+		/*       call it and not the others for that team          */
+		/*       member.                                           */
+
+		/*
+		 * We cannot assume that SIOCGMIIPHY will also read a
+		 * register; not all network drivers (e.g., e100)
+		 * support that.
+		 */
+
+		/* Yes, the mii is overlaid on the ifreq.ifr_ifru */
+		strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
+		mii = if_mii(&ifr);
+		if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
+			mii->reg_num = MII_BMSR;
+			if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
+				return (mii->val_out & BMSR_LSTATUS);
+			}
+		}
+	}
+
+	/* try SIOCETHTOOL ioctl, some drivers cache ETHTOOL_GLINK */
+	/* for a period of time so we attempt to get link status   */
+	/* from it last if the above MII ioctls fail...            */
+	if (slave_dev->ethtool_ops) {
+		if (slave_dev->ethtool_ops->get_link) {
+			u32 link;
+
+			link = slave_dev->ethtool_ops->get_link(slave_dev);
+
+			return link ? BMSR_LSTATUS : 0;
+		}
+	}
+
+	if (ioctl) {
+		strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
+		etool.cmd = ETHTOOL_GLINK;
+		ifr.ifr_data = (char*)&etool;
+		if (IOCTL(slave_dev, &ifr, SIOCETHTOOL) == 0) {
+			if (etool.data == 1) {
+				return BMSR_LSTATUS;
+			} else {
+				dprintk("SIOCETHTOOL shows link down\n");
+				return 0;
+			}
+		}
+	}
+
+	/*
+	 * If reporting, report that either there's no dev->do_ioctl,
+	 * or both SIOCGMIIREG and SIOCETHTOOL failed (meaning that we
+	 * cannot report link status).  If not reporting, pretend
+	 * we're ok.
+	 */
+	return (reporting ? -1 : BMSR_LSTATUS);
+}
+
+/*----------------------------- Multicast list ------------------------------*/
+
+/*
+ * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
+ */
+static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
+{
+	return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
+			dmi1->dmi_addrlen == dmi2->dmi_addrlen;
+}
+
+/*
+ * returns dmi entry if found, NULL otherwise
+ */
+static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
+{
+	struct dev_mc_list *idmi;
+
+	for (idmi = mc_list; idmi; idmi = idmi->next) {
+		if (bond_is_dmi_same(dmi, idmi)) {
+			return idmi;
+		}
+	}
+
+	return NULL;
+}
+
+/*
+ * Push the promiscuity flag down to appropriate slaves
+ */
+static void bond_set_promiscuity(struct bonding *bond, int inc)
+{
+	if (USES_PRIMARY(bond->params.mode)) {
+		/* write lock already acquired */
+		if (bond->curr_active_slave) {
+			dev_set_promiscuity(bond->curr_active_slave->dev, inc);
+		}
+	} else {
+		struct slave *slave;
+		int i;
+		bond_for_each_slave(bond, slave, i) {
+			dev_set_promiscuity(slave->dev, inc);
+		}
+	}
+}
+
+/*
+ * Push the allmulti flag down to all slaves
+ */
+static void bond_set_allmulti(struct bonding *bond, int inc)
+{
+	if (USES_PRIMARY(bond->params.mode)) {
+		/* write lock already acquired */
+		if (bond->curr_active_slave) {
+			dev_set_allmulti(bond->curr_active_slave->dev, inc);
+		}
+	} else {
+		struct slave *slave;
+		int i;
+		bond_for_each_slave(bond, slave, i) {
+			dev_set_allmulti(slave->dev, inc);
+		}
+	}
+}
+
+/*
+ * Add a Multicast address to slaves
+ * according to mode
+ */
+static void bond_mc_add(struct bonding *bond, void *addr, int alen)
+{
+	if (USES_PRIMARY(bond->params.mode)) {
+		/* write lock already acquired */
+		if (bond->curr_active_slave) {
+			dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
+		}
+	} else {
+		struct slave *slave;
+		int i;
+		bond_for_each_slave(bond, slave, i) {
+			dev_mc_add(slave->dev, addr, alen, 0);
+		}
+	}
+}
+
+/*
+ * Remove a multicast address from slave
+ * according to mode
+ */
+static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
+{
+	if (USES_PRIMARY(bond->params.mode)) {
+		/* write lock already acquired */
+		if (bond->curr_active_slave) {
+			dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
+		}
+	} else {
+		struct slave *slave;
+		int i;
+		bond_for_each_slave(bond, slave, i) {
+			dev_mc_delete(slave->dev, addr, alen, 0);
+		}
+	}
+}
+
+/*
+ * Totally destroys the mc_list in bond
+ */
+static void bond_mc_list_destroy(struct bonding *bond)
+{
+	struct dev_mc_list *dmi;
+
+	dmi = bond->mc_list;
+	while (dmi) {
+		bond->mc_list = dmi->next;
+		kfree(dmi);
+		dmi = bond->mc_list;
+	}
+}
+
+/*
+ * Copy all the Multicast addresses from src to the bonding device dst
+ */
+static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond, int gpf_flag)
+{
+	struct dev_mc_list *dmi, *new_dmi;
+
+	for (dmi = mc_list; dmi; dmi = dmi->next) {
+		new_dmi = kmalloc(sizeof(struct dev_mc_list), gpf_flag);
+
+		if (!new_dmi) {
+			/* FIXME: Potential memory leak !!! */
+			return -ENOMEM;
+		}
+
+		new_dmi->next = bond->mc_list;
+		bond->mc_list = new_dmi;
+		new_dmi->dmi_addrlen = dmi->dmi_addrlen;
+		memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
+		new_dmi->dmi_users = dmi->dmi_users;
+		new_dmi->dmi_gusers = dmi->dmi_gusers;
+	}
+
+	return 0;
+}
+
+/*
+ * flush all members of flush->mc_list from device dev->mc_list
+ */
+static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct dev_mc_list *dmi;
+
+	for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
+		dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
+	}
+
+	if (bond->params.mode == BOND_MODE_8023AD) {
+		/* del lacpdu mc addr from mc list */
+		u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
+
+		dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
+	}
+}
+
+/*--------------------------- Active slave change ---------------------------*/
+
+/*
+ * Update the mc list and multicast-related flags for the new and
+ * old active slaves (if any) according to the multicast mode, and
+ * promiscuous flags unconditionally.
+ */
+static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
+{
+	struct dev_mc_list *dmi;
+
+	if (!USES_PRIMARY(bond->params.mode)) {
+		/* nothing to do -  mc list is already up-to-date on
+		 * all slaves
+		 */
+		return;
+	}
+
+	if (old_active) {
+		if (bond->dev->flags & IFF_PROMISC) {
+			dev_set_promiscuity(old_active->dev, -1);
+		}
+
+		if (bond->dev->flags & IFF_ALLMULTI) {
+			dev_set_allmulti(old_active->dev, -1);
+		}
+
+		for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
+			dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
+		}
+	}
+
+	if (new_active) {
+		if (bond->dev->flags & IFF_PROMISC) {
+			dev_set_promiscuity(new_active->dev, 1);
+		}
+
+		if (bond->dev->flags & IFF_ALLMULTI) {
+			dev_set_allmulti(new_active->dev, 1);
+		}
+
+		for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
+			dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
+		}
+	}
+}
+
+/**
+ * find_best_interface - select the best available slave to be the active one
+ * @bond: our bonding struct
+ *
+ * Warning: Caller must hold curr_slave_lock for writing.
+ */
+static struct slave *bond_find_best_slave(struct bonding *bond)
+{
+	struct slave *new_active, *old_active;
+	struct slave *bestslave = NULL;
+	int mintime = bond->params.updelay;
+	int i;
+
+	new_active = old_active = bond->curr_active_slave;
+
+	if (!new_active) { /* there were no active slaves left */
+		if (bond->slave_cnt > 0) {  /* found one slave */
+			new_active = bond->first_slave;
+		} else {
+			return NULL; /* still no slave, return NULL */
+		}
+	}
+
+	/* first try the primary link; if arping, a link must tx/rx traffic
+	 * before it can be considered the curr_active_slave - also, we would skip
+	 * slaves between the curr_active_slave and primary_slave that may be up
+	 * and able to arp
+	 */
+	if ((bond->primary_slave) &&
+	    (!bond->params.arp_interval) &&
+	    (IS_UP(bond->primary_slave->dev))) {
+		new_active = bond->primary_slave;
+	}
+
+	/* remember where to stop iterating over the slaves */
+	old_active = new_active;
+
+	bond_for_each_slave_from(bond, new_active, i, old_active) {
+		if (IS_UP(new_active->dev)) {
+			if (new_active->link == BOND_LINK_UP) {
+				return new_active;
+			} else if (new_active->link == BOND_LINK_BACK) {
+				/* link up, but waiting for stabilization */
+				if (new_active->delay < mintime) {
+					mintime = new_active->delay;
+					bestslave = new_active;
+				}
+			}
+		}
+	}
+
+	return bestslave;
+}
+
+/**
+ * change_active_interface - change the active slave into the specified one
+ * @bond: our bonding struct
+ * @new: the new slave to make the active one
+ *
+ * Set the new slave to the bond's settings and unset them on the old
+ * curr_active_slave.
+ * Setting include flags, mc-list, promiscuity, allmulti, etc.
+ *
+ * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
+ * because it is apparently the best available slave we have, even though its
+ * updelay hasn't timed out yet.
+ *
+ * Warning: Caller must hold curr_slave_lock for writing.
+ */
+static void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
+{
+	struct slave *old_active = bond->curr_active_slave;
+
+	if (old_active == new_active) {
+		return;
+	}
+
+	if (new_active) {
+		if (new_active->link == BOND_LINK_BACK) {
+			if (USES_PRIMARY(bond->params.mode)) {
+				printk(KERN_INFO DRV_NAME
+				       ": %s: making interface %s the new "
+				       "active one %d ms earlier.\n",
+				       bond->dev->name, new_active->dev->name,
+				       (bond->params.updelay - new_active->delay) * bond->params.miimon);
+			}
+
+			new_active->delay = 0;
+			new_active->link = BOND_LINK_UP;
+			new_active->jiffies = jiffies;
+
+			if (bond->params.mode == BOND_MODE_8023AD) {
+				bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
+			}
+
+			if ((bond->params.mode == BOND_MODE_TLB) ||
+			    (bond->params.mode == BOND_MODE_ALB)) {
+				bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
+			}
+		} else {
+			if (USES_PRIMARY(bond->params.mode)) {
+				printk(KERN_INFO DRV_NAME
+				       ": %s: making interface %s the new "
+				       "active one.\n",
+				       bond->dev->name, new_active->dev->name);
+			}
+		}
+	}
+
+	if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
+		if (old_active) {
+			bond_set_slave_inactive_flags(old_active);
+		}
+
+		if (new_active) {
+			bond_set_slave_active_flags(new_active);
+		}
+	}
+
+	if (USES_PRIMARY(bond->params.mode)) {
+		bond_mc_swap(bond, new_active, old_active);
+	}
+
+	if ((bond->params.mode == BOND_MODE_TLB) ||
+	    (bond->params.mode == BOND_MODE_ALB)) {
+		bond_alb_handle_active_change(bond, new_active);
+	} else {
+		bond->curr_active_slave = new_active;
+	}
+}
+
+/**
+ * bond_select_active_slave - select a new active slave, if needed
+ * @bond: our bonding struct
+ *
+ * This functions shoud be called when one of the following occurs:
+ * - The old curr_active_slave has been released or lost its link.
+ * - The primary_slave has got its link back.
+ * - A slave has got its link back and there's no old curr_active_slave.
+ *
+ * Warning: Caller must hold curr_slave_lock for writing.
+ */
+static void bond_select_active_slave(struct bonding *bond)
+{
+	struct slave *best_slave;
+
+	best_slave = bond_find_best_slave(bond);
+	if (best_slave != bond->curr_active_slave) {
+		bond_change_active_slave(bond, best_slave);
+	}
+}
+
+/*--------------------------- slave list handling ---------------------------*/
+
+/*
+ * This function attaches the slave to the end of list.
+ *
+ * bond->lock held for writing by caller.
+ */
+static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
+{
+	if (bond->first_slave == NULL) { /* attaching the first slave */
+		new_slave->next = new_slave;
+		new_slave->prev = new_slave;
+		bond->first_slave = new_slave;
+	} else {
+		new_slave->next = bond->first_slave;
+		new_slave->prev = bond->first_slave->prev;
+		new_slave->next->prev = new_slave;
+		new_slave->prev->next = new_slave;
+	}
+
+	bond->slave_cnt++;
+}
+
+/*
+ * This function detaches the slave from the list.
+ * WARNING: no check is made to verify if the slave effectively
+ * belongs to <bond>.
+ * Nothing is freed on return, structures are just unchained.
+ * If any slave pointer in bond was pointing to <slave>,
+ * it should be changed by the calling function.
+ *
+ * bond->lock held for writing by caller.
+ */
+static void bond_detach_slave(struct bonding *bond, struct slave *slave)
+{
+	if (slave->next) {
+		slave->next->prev = slave->prev;
+	}
+
+	if (slave->prev) {
+		slave->prev->next = slave->next;
+	}
+
+	if (bond->first_slave == slave) { /* slave is the first slave */
+		if (bond->slave_cnt > 1) { /* there are more slave */
+			bond->first_slave = slave->next;
+		} else {
+			bond->first_slave = NULL; /* slave was the last one */
+		}
+	}
+
+	slave->next = NULL;
+	slave->prev = NULL;
+	bond->slave_cnt--;
+}
+
+/*---------------------------------- IOCTL ----------------------------------*/
+
+static int bond_sethwaddr(struct net_device *bond_dev, struct net_device *slave_dev)
+{
+	dprintk("bond_dev=%p\n", bond_dev);
+	dprintk("slave_dev=%p\n", slave_dev);
+	dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
+	memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
+	return 0;
+}
+
+/* enslave device <slave> to bond device <master> */
+static int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct slave *new_slave = NULL;
+	struct dev_mc_list *dmi;
+	struct sockaddr addr;
+	int link_reporting;
+	int old_features = bond_dev->features;
+	int res = 0;
+
+	if (slave_dev->do_ioctl == NULL) {
+		printk(KERN_WARNING DRV_NAME
+		       ": Warning : no link monitoring support for %s\n",
+		       slave_dev->name);
+	}
+
+	/* bond must be initialized by bond_open() before enslaving */
+	if (!(bond_dev->flags & IFF_UP)) {
+		dprintk("Error, master_dev is not up\n");
+		return -EPERM;
+	}
+
+	/* already enslaved */
+	if (slave_dev->flags & IFF_SLAVE) {
+		dprintk("Error, Device was already enslaved\n");
+		return -EBUSY;
+	}
+
+	/* vlan challenged mutual exclusion */
+	/* no need to lock since we're protected by rtnl_lock */
+	if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
+		dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
+		if (!list_empty(&bond->vlan_list)) {
+			printk(KERN_ERR DRV_NAME
+			       ": Error: cannot enslave VLAN "
+			       "challenged slave %s on VLAN enabled "
+			       "bond %s\n", slave_dev->name,
+			       bond_dev->name);
+			return -EPERM;
+		} else {
+			printk(KERN_WARNING DRV_NAME
+			       ": Warning: enslaved VLAN challenged "
+			       "slave %s. Adding VLANs will be blocked as "
+			       "long as %s is part of bond %s\n",
+			       slave_dev->name, slave_dev->name,
+			       bond_dev->name);
+			bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
+		}
+	} else {
+		dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
+		if (bond->slave_cnt == 0) {
+			/* First slave, and it is not VLAN challenged,
+			 * so remove the block of adding VLANs over the bond.
+			 */
+			bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
+		}
+	}
+
+	if (app_abi_ver >= 1) {
+		/* The application is using an ABI, which requires the
+		 * slave interface to be closed.
+		 */
+		if ((slave_dev->flags & IFF_UP)) {
+			printk(KERN_ERR DRV_NAME
+			       ": Error: %s is up\n",
+			       slave_dev->name);
+			res = -EPERM;
+			goto err_undo_flags;
+		}
+
+		if (slave_dev->set_mac_address == NULL) {
+			printk(KERN_ERR DRV_NAME
+			       ": Error: The slave device you specified does "
+			       "not support setting the MAC address.\n");
+			printk(KERN_ERR
+			       "Your kernel likely does not support slave "
+			       "devices.\n");
+
+			res = -EOPNOTSUPP;
+			goto err_undo_flags;
+		}
+	} else {
+		/* The application is not using an ABI, which requires the
+		 * slave interface to be open.
+		 */
+		if (!(slave_dev->flags & IFF_UP)) {
+			printk(KERN_ERR DRV_NAME
+			       ": Error: %s is not running\n",
+			       slave_dev->name);
+			res = -EINVAL;
+			goto err_undo_flags;
+		}
+
+		if ((bond->params.mode == BOND_MODE_8023AD) ||
+		    (bond->params.mode == BOND_MODE_TLB)    ||
+		    (bond->params.mode == BOND_MODE_ALB)) {
+			printk(KERN_ERR DRV_NAME
+			       ": Error: to use %s mode, you must upgrade "
+			       "ifenslave.\n",
+			       bond_mode_name(bond->params.mode));
+			res = -EOPNOTSUPP;
+			goto err_undo_flags;
+		}
+	}
+
+	new_slave = kmalloc(sizeof(struct slave), GFP_KERNEL);
+	if (!new_slave) {
+		res = -ENOMEM;
+		goto err_undo_flags;
+	}
+
+	memset(new_slave, 0, sizeof(struct slave));
+
+	/* save slave's original flags before calling
+	 * netdev_set_master and dev_open
+	 */
+	new_slave->original_flags = slave_dev->flags;
+
+	if (app_abi_ver >= 1) {
+		/* save slave's original ("permanent") mac address for
+		 * modes that needs it, and for restoring it upon release,
+		 * and then set it to the master's address
+		 */
+		memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
+
+		/* set slave to master's mac address
+		 * The application already set the master's
+		 * mac address to that of the first slave
+		 */
+		memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
+		addr.sa_family = slave_dev->type;
+		res = dev_set_mac_address(slave_dev, &addr);
+		if (res) {
+			dprintk("Error %d calling set_mac_address\n", res);
+			goto err_free;
+		}
+
+		/* open the slave since the application closed it */
+		res = dev_open(slave_dev);
+		if (res) {
+			dprintk("Openning slave %s failed\n", slave_dev->name);
+			goto err_restore_mac;
+		}
+	}
+
+	res = netdev_set_master(slave_dev, bond_dev);
+	if (res) {
+		dprintk("Error %d calling netdev_set_master\n", res);
+		if (app_abi_ver < 1) {
+			goto err_free;
+		} else {
+			goto err_close;
+		}
+	}
+
+	new_slave->dev = slave_dev;
+
+	if ((bond->params.mode == BOND_MODE_TLB) ||
+	    (bond->params.mode == BOND_MODE_ALB)) {
+		/* bond_alb_init_slave() must be called before all other stages since
+		 * it might fail and we do not want to have to undo everything
+		 */
+		res = bond_alb_init_slave(bond, new_slave);
+		if (res) {
+			goto err_unset_master;
+		}
+	}
+
+	/* If the mode USES_PRIMARY, then the new slave gets the
+	 * master's promisc (and mc) settings only if it becomes the
+	 * curr_active_slave, and that is taken care of later when calling
+	 * bond_change_active()
+	 */
+	if (!USES_PRIMARY(bond->params.mode)) {
+		/* set promiscuity level to new slave */
+		if (bond_dev->flags & IFF_PROMISC) {
+			dev_set_promiscuity(slave_dev, 1);
+		}
+
+		/* set allmulti level to new slave */
+		if (bond_dev->flags & IFF_ALLMULTI) {
+			dev_set_allmulti(slave_dev, 1);
+		}
+
+		/* upload master's mc_list to new slave */
+		for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
+			dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
+		}
+	}
+
+	if (bond->params.mode == BOND_MODE_8023AD) {
+		/* add lacpdu mc addr to mc list */
+		u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
+
+		dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
+	}
+
+	bond_add_vlans_on_slave(bond, slave_dev);
+
+	write_lock_bh(&bond->lock);
+
+	bond_attach_slave(bond, new_slave);
+
+	new_slave->delay = 0;
+	new_slave->link_failure_count = 0;
+
+	if (bond->params.miimon && !bond->params.use_carrier) {
+		link_reporting = bond_check_dev_link(bond, slave_dev, 1);
+
+		if ((link_reporting == -1) && !bond->params.arp_interval) {
+			/*
+			 * miimon is set but a bonded network driver
+			 * does not support ETHTOOL/MII and
+			 * arp_interval is not set.  Note: if
+			 * use_carrier is enabled, we will never go
+			 * here (because netif_carrier is always
+			 * supported); thus, we don't need to change
+			 * the messages for netif_carrier.
+			 */
+			printk(KERN_WARNING DRV_NAME
+			       ": Warning: MII and ETHTOOL support not "
+			       "available for interface %s, and "
+			       "arp_interval/arp_ip_target module parameters "
+			       "not specified, thus bonding will not detect "
+			       "link failures! see bonding.txt for details.\n",
+			       slave_dev->name);
+		} else if (link_reporting == -1) {
+			/* unable get link status using mii/ethtool */
+			printk(KERN_WARNING DRV_NAME
+			       ": Warning: can't get link status from "
+			       "interface %s; the network driver associated "
+			       "with this interface does not support MII or "
+			       "ETHTOOL link status reporting, thus miimon "
+			       "has no effect on this interface.\n",
+			       slave_dev->name);
+		}
+	}
+
+	/* check for initial state */
+	if (!bond->params.miimon ||
+	    (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
+		if (bond->params.updelay) {
+			dprintk("Initial state of slave_dev is "
+				"BOND_LINK_BACK\n");
+			new_slave->link  = BOND_LINK_BACK;
+			new_slave->delay = bond->params.updelay;
+		} else {
+			dprintk("Initial state of slave_dev is "
+				"BOND_LINK_UP\n");
+			new_slave->link  = BOND_LINK_UP;
+		}
+		new_slave->jiffies = jiffies;
+	} else {
+		dprintk("Initial state of slave_dev is "
+			"BOND_LINK_DOWN\n");
+		new_slave->link  = BOND_LINK_DOWN;
+	}
+
+	if (bond_update_speed_duplex(new_slave) &&
+	    (new_slave->link != BOND_LINK_DOWN)) {
+		printk(KERN_WARNING DRV_NAME
+		       ": Warning: failed to get speed and duplex from %s, "
+		       "assumed to be 100Mb/sec and Full.\n",
+		       new_slave->dev->name);
+
+		if (bond->params.mode == BOND_MODE_8023AD) {
+			printk(KERN_WARNING
+			       "Operation of 802.3ad mode requires ETHTOOL "
+			       "support in base driver for proper aggregator "
+			       "selection.\n");
+		}
+	}
+
+	if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
+		/* if there is a primary slave, remember it */
+		if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
+			bond->primary_slave = new_slave;
+		}
+	}
+
+	switch (bond->params.mode) {
+	case BOND_MODE_ACTIVEBACKUP:
+		/* if we're in active-backup mode, we need one and only one active
+		 * interface. The backup interfaces will have their NOARP flag set
+		 * because we need them to be completely deaf and not to respond to
+		 * any ARP request on the network to avoid fooling a switch. Thus,
+		 * since we guarantee that curr_active_slave always point to the last
+		 * usable interface, we just have to verify this interface's flag.
+		 */
+		if (((!bond->curr_active_slave) ||
+		     (bond->curr_active_slave->dev->flags & IFF_NOARP)) &&
+		    (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);
+		} else {
+			dprintk("This is just a backup slave\n");
+			bond_set_slave_inactive_flags(new_slave);
+		}
+		break;
+	case BOND_MODE_8023AD:
+		/* in 802.3ad mode, the internal mechanism
+		 * will activate the slaves in the selected
+		 * aggregator
+		 */
+		bond_set_slave_inactive_flags(new_slave);
+		/* if this is the first slave */
+		if (bond->slave_cnt == 1) {
+			SLAVE_AD_INFO(new_slave).id = 1;
+			/* Initialize AD with the number of times that the AD timer is called in 1 second
+			 * can be called only after the mac address of the bond is set
+			 */
+			bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
+					    bond->params.lacp_fast);
+		} else {
+			SLAVE_AD_INFO(new_slave).id =
+				SLAVE_AD_INFO(new_slave->prev).id + 1;
+		}
+
+		bond_3ad_bind_slave(new_slave);
+		break;
+	case BOND_MODE_TLB:
+	case BOND_MODE_ALB:
+		new_slave->state = BOND_STATE_ACTIVE;
+		if ((!bond->curr_active_slave) &&
+		    (new_slave->link != BOND_LINK_DOWN)) {
+			/* 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);
+		}
+		break;
+	default:
+		dprintk("This slave is always active in trunk mode\n");
+
+		/* always active in trunk mode */
+		new_slave->state = BOND_STATE_ACTIVE;
+
+		/* In trunking mode there is little meaning to curr_active_slave
+		 * anyway (it holds no special properties of the bond device),
+		 * so we can change it without calling change_active_interface()
+		 */
+		if (!bond->curr_active_slave) {
+			bond->curr_active_slave = new_slave;
+		}
+		break;
+	} /* switch(bond_mode) */
+
+	write_unlock_bh(&bond->lock);
+
+	if (app_abi_ver < 1) {
+		/*
+		 * !!! This is to support old versions of ifenslave.
+		 * We can remove this in 2.5 because our ifenslave takes
+		 * care of this for us.
+		 * We check to see if the master has a mac address yet.
+		 * If not, we'll give it the mac address of our slave device.
+		 */
+		int ndx = 0;
+
+		for (ndx = 0; ndx < bond_dev->addr_len; ndx++) {
+			dprintk("Checking ndx=%d of bond_dev->dev_addr\n",
+				ndx);
+			if (bond_dev->dev_addr[ndx] != 0) {
+				dprintk("Found non-zero byte at ndx=%d\n",
+					ndx);
+				break;
+			}
+		}
+
+		if (ndx == bond_dev->addr_len) {
+			/*
+			 * We got all the way through the address and it was
+			 * all 0's.
+			 */
+			dprintk("%s doesn't have a MAC address yet.  \n",
+				bond_dev->name);
+			dprintk("Going to give assign it from %s.\n",
+				slave_dev->name);
+			bond_sethwaddr(bond_dev, slave_dev);
+		}
+	}
+
+	printk(KERN_INFO DRV_NAME
+	       ": %s: enslaving %s as a%s interface with a%s link.\n",
+	       bond_dev->name, slave_dev->name,
+	       new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
+	       new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
+
+	/* enslave is successful */
+	return 0;
+
+/* Undo stages on error */
+err_unset_master:
+	netdev_set_master(slave_dev, NULL);
+
+err_close:
+	dev_close(slave_dev);
+
+err_restore_mac:
+	memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
+	addr.sa_family = slave_dev->type;
+	dev_set_mac_address(slave_dev, &addr);
+
+err_free:
+	kfree(new_slave);
+
+err_undo_flags:
+	bond_dev->features = old_features;
+
+	return res;
+}
+
+/*
+ * Try to release the slave device <slave> from the bond device <master>
+ * It is legal to access curr_active_slave without a lock because all the function
+ * is write-locked.
+ *
+ * The rules for slave state should be:
+ *   for Active/Backup:
+ *     Active stays on all backups go down
+ *   for Bonded connections:
+ *     The first up interface should be left on and all others downed.
+ */
+static int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct slave *slave, *oldcurrent;
+	struct sockaddr addr;
+	int mac_addr_differ;
+
+	/* slave is not a slave or master is not master of this slave */
+	if (!(slave_dev->flags & IFF_SLAVE) ||
+	    (slave_dev->master != bond_dev)) {
+		printk(KERN_ERR DRV_NAME
+		       ": Error: %s: cannot release %s.\n",
+		       bond_dev->name, slave_dev->name);
+		return -EINVAL;
+	}
+
+	write_lock_bh(&bond->lock);
+
+	slave = bond_get_slave_by_dev(bond, slave_dev);
+	if (!slave) {
+		/* not a slave of this bond */
+		printk(KERN_INFO DRV_NAME
+		       ": %s: %s not enslaved\n",
+		       bond_dev->name, slave_dev->name);
+		return -EINVAL;
+	}
+
+	mac_addr_differ = memcmp(bond_dev->dev_addr,
+				 slave->perm_hwaddr,
+				 ETH_ALEN);
+	if (!mac_addr_differ && (bond->slave_cnt > 1)) {
+		printk(KERN_WARNING DRV_NAME
+		       ": Warning: the permanent HWaddr of %s "
+		       "- %02X:%02X:%02X:%02X:%02X:%02X - is "
+		       "still in use by %s. Set the HWaddr of "
+		       "%s to a different address to avoid "
+		       "conflicts.\n",
+		       slave_dev->name,
+		       slave->perm_hwaddr[0],
+		       slave->perm_hwaddr[1],
+		       slave->perm_hwaddr[2],
+		       slave->perm_hwaddr[3],
+		       slave->perm_hwaddr[4],
+		       slave->perm_hwaddr[5],
+		       bond_dev->name,
+		       slave_dev->name);
+	}
+
+	/* Inform AD package of unbinding of slave. */
+	if (bond->params.mode == BOND_MODE_8023AD) {
+		/* must be called before the slave is
+		 * detached from the list
+		 */
+		bond_3ad_unbind_slave(slave);
+	}
+
+	printk(KERN_INFO DRV_NAME
+	       ": %s: releasing %s interface %s\n",
+	       bond_dev->name,
+	       (slave->state == BOND_STATE_ACTIVE)
+	       ? "active" : "backup",
+	       slave_dev->name);
+
+	oldcurrent = bond->curr_active_slave;
+
+	bond->current_arp_slave = NULL;
+
+	/* release the slave from its bond */
+	bond_detach_slave(bond, slave);
+
+	if (bond->primary_slave == slave) {
+		bond->primary_slave = NULL;
+	}
+
+	if (oldcurrent == slave) {
+		bond_change_active_slave(bond, NULL);
+	}
+
+	if ((bond->params.mode == BOND_MODE_TLB) ||
+	    (bond->params.mode == BOND_MODE_ALB)) {
+		/* Must be called only after the slave has been
+		 * detached from the list and the curr_active_slave
+		 * has been cleared (if our_slave == old_current),
+		 * but before a new active slave is selected.
+		 */
+		bond_alb_deinit_slave(bond, 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) {
+		/* 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
+		 */
+		memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
+
+		if (list_empty(&bond->vlan_list)) {
+			bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
+		} else {
+			printk(KERN_WARNING DRV_NAME
+			       ": Warning: clearing HW address of %s while it "
+			       "still has VLANs.\n",
+			       bond_dev->name);
+			printk(KERN_WARNING DRV_NAME
+			       ": When re-adding slaves, make sure the bond's "
+			       "HW address matches its VLANs'.\n");
+		}
+	} else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
+		   !bond_has_challenged_slaves(bond)) {
+		printk(KERN_INFO DRV_NAME
+		       ": last VLAN challenged slave %s "
+		       "left bond %s. VLAN blocking is removed\n",
+		       slave_dev->name, bond_dev->name);
+		bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
+	}
+
+	write_unlock_bh(&bond->lock);
+
+	bond_del_vlans_from_slave(bond, slave_dev);
+
+	/* If the mode USES_PRIMARY, then we should only remove its
+	 * promisc and mc settings if it was the curr_active_slave, but that was
+	 * already taken care of above when we detached the slave
+	 */
+	if (!USES_PRIMARY(bond->params.mode)) {
+		/* unset promiscuity level from slave */
+		if (bond_dev->flags & IFF_PROMISC) {
+			dev_set_promiscuity(slave_dev, -1);
+		}
+
+		/* unset allmulti level from slave */
+		if (bond_dev->flags & IFF_ALLMULTI) {
+			dev_set_allmulti(slave_dev, -1);
+		}
+
+		/* flush master's mc_list from slave */
+		bond_mc_list_flush(bond_dev, slave_dev);
+	}
+
+	netdev_set_master(slave_dev, NULL);
+
+	/* close slave before restoring its mac address */
+	dev_close(slave_dev);
+
+	if (app_abi_ver >= 1) {
+		/* restore original ("permanent") mac address */
+		memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
+		addr.sa_family = slave_dev->type;
+		dev_set_mac_address(slave_dev, &addr);
+	}
+
+	/* restore the original state of the
+	 * IFF_NOARP flag that might have been
+	 * set by bond_set_slave_inactive_flags()
+	 */
+	if ((slave->original_flags & IFF_NOARP) == 0) {
+		slave_dev->flags &= ~IFF_NOARP;
+	}
+
+	kfree(slave);
+
+	return 0;  /* deletion OK */
+}
+
+/*
+ * This function releases all slaves.
+ */
+static int bond_release_all(struct net_device *bond_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct slave *slave;
+	struct net_device *slave_dev;
+	struct sockaddr addr;
+
+	write_lock_bh(&bond->lock);
+
+	if (bond->slave_cnt == 0) {
+		goto out;
+	}
+
+	bond->current_arp_slave = NULL;
+	bond->primary_slave = NULL;
+	bond_change_active_slave(bond, NULL);
+
+	while ((slave = bond->first_slave) != NULL) {
+		/* Inform AD package of unbinding of slave
+		 * before slave is detached from the list.
+		 */
+		if (bond->params.mode == BOND_MODE_8023AD) {
+			bond_3ad_unbind_slave(slave);
+		}
+
+		slave_dev = slave->dev;
+		bond_detach_slave(bond, slave);
+
+		if ((bond->params.mode == BOND_MODE_TLB) ||
+		    (bond->params.mode == BOND_MODE_ALB)) {
+			/* must be called only after the slave
+			 * has been detached from the list
+			 */
+			bond_alb_deinit_slave(bond, slave);
+		}
+
+		/* now that the slave is detached, unlock and perform
+		 * all the undo steps that should not be called from
+		 * within a lock.
+		 */
+		write_unlock_bh(&bond->lock);
+
+		bond_del_vlans_from_slave(bond, slave_dev);
+
+		/* If the mode USES_PRIMARY, then we should only remove its
+		 * promisc and mc settings if it was the curr_active_slave, but that was
+		 * already taken care of above when we detached the slave
+		 */
+		if (!USES_PRIMARY(bond->params.mode)) {
+			/* unset promiscuity level from slave */
+			if (bond_dev->flags & IFF_PROMISC) {
+				dev_set_promiscuity(slave_dev, -1);
+			}
+
+			/* unset allmulti level from slave */
+			if (bond_dev->flags & IFF_ALLMULTI) {
+				dev_set_allmulti(slave_dev, -1);
+			}
+
+			/* flush master's mc_list from slave */
+			bond_mc_list_flush(bond_dev, slave_dev);
+		}
+
+		netdev_set_master(slave_dev, NULL);
+
+		/* close slave before restoring its mac address */
+		dev_close(slave_dev);
+
+		if (app_abi_ver >= 1) {
+			/* restore original ("permanent") mac address*/
+			memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
+			addr.sa_family = slave_dev->type;
+			dev_set_mac_address(slave_dev, &addr);
+		}
+
+		/* restore the original state of the IFF_NOARP flag that might have
+		 * been set by bond_set_slave_inactive_flags()
+		 */
+		if ((slave->original_flags & IFF_NOARP) == 0) {
+			slave_dev->flags &= ~IFF_NOARP;
+		}
+
+		kfree(slave);
+
+		/* re-acquire the lock before getting the next slave */
+		write_lock_bh(&bond->lock);
+	}
+
+	/* zero the mac address of the master so it will be
+	 * set by the application to the mac address of the
+	 * first slave
+	 */
+	memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
+
+	if (list_empty(&bond->vlan_list)) {
+		bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
+	} else {
+		printk(KERN_WARNING DRV_NAME
+		       ": Warning: clearing HW address of %s while it "
+		       "still has VLANs.\n",
+		       bond_dev->name);
+		printk(KERN_WARNING DRV_NAME
+		       ": When re-adding slaves, make sure the bond's "
+		       "HW address matches its VLANs'.\n");
+	}
+
+	printk(KERN_INFO DRV_NAME
+	       ": %s: released all slaves\n",
+	       bond_dev->name);
+
+out:
+	write_unlock_bh(&bond->lock);
+
+	return 0;
+}
+
+/*
+ * This function changes the active slave to slave <slave_dev>.
+ * It returns -EINVAL in the following cases.
+ *  - <slave_dev> is not found in the list.
+ *  - There is not active slave now.
+ *  - <slave_dev> is already active.
+ *  - The link state of <slave_dev> is not BOND_LINK_UP.
+ *  - <slave_dev> is not running.
+ * In these cases, this fuction does nothing.
+ * In the other cases, currnt_slave pointer is changed and 0 is returned.
+ */
+static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct slave *old_active = NULL;
+	struct slave *new_active = NULL;
+	int res = 0;
+
+	if (!USES_PRIMARY(bond->params.mode)) {
+		return -EINVAL;
+	}
+
+	/* Verify that master_dev is indeed the master of slave_dev */
+	if (!(slave_dev->flags & IFF_SLAVE) ||
+	    (slave_dev->master != bond_dev)) {
+		return -EINVAL;
+	}
+
+	write_lock_bh(&bond->lock);
+
+	old_active = bond->curr_active_slave;
+	new_active = bond_get_slave_by_dev(bond, slave_dev);
+
+	/*
+	 * Changing to the current active: do nothing; return success.
+	 */
+	if (new_active && (new_active == old_active)) {
+		write_unlock_bh(&bond->lock);
+		return 0;
+	}
+
+	if ((new_active) &&
+	    (old_active) &&
+	    (new_active->link == BOND_LINK_UP) &&
+	    IS_UP(new_active->dev)) {
+		bond_change_active_slave(bond, new_active);
+	} else {
+		res = -EINVAL;
+	}
+
+	write_unlock_bh(&bond->lock);
+
+	return res;
+}
+
+static int bond_ethtool_ioctl(struct net_device *bond_dev, struct ifreq *ifr)
+{
+	struct ethtool_drvinfo info;
+	void __user *addr = ifr->ifr_data;
+	uint32_t cmd;
+
+	if (get_user(cmd, (uint32_t __user *)addr)) {
+		return -EFAULT;
+	}
+
+	switch (cmd) {
+	case ETHTOOL_GDRVINFO:
+		if (copy_from_user(&info, addr, sizeof(info))) {
+			return -EFAULT;
+		}
+
+		if (strcmp(info.driver, "ifenslave") == 0) {
+			int new_abi_ver;
+			char *endptr;
+
+			new_abi_ver = simple_strtoul(info.fw_version,
+						     &endptr, 0);
+			if (*endptr) {
+				printk(KERN_ERR DRV_NAME
+				       ": Error: got invalid ABI "
+				       "version from application\n");
+
+				return -EINVAL;
+			}
+
+			if (orig_app_abi_ver == -1) {
+				orig_app_abi_ver  = new_abi_ver;
+			}
+
+			app_abi_ver = new_abi_ver;
+		}
+
+		strncpy(info.driver,  DRV_NAME, 32);
+		strncpy(info.version, DRV_VERSION, 32);
+		snprintf(info.fw_version, 32, "%d", BOND_ABI_VERSION);
+
+		if (copy_to_user(addr, &info, sizeof(info))) {
+			return -EFAULT;
+		}
+
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
+{
+	struct bonding *bond = bond_dev->priv;
+
+	info->bond_mode = bond->params.mode;
+	info->miimon = bond->params.miimon;
+
+	read_lock_bh(&bond->lock);
+	info->num_slaves = bond->slave_cnt;
+	read_unlock_bh(&bond->lock);
+
+	return 0;
+}
+
+static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct slave *slave;
+	int i, found = 0;
+
+	if (info->slave_id < 0) {
+		return -ENODEV;
+	}
+
+	read_lock_bh(&bond->lock);
+
+	bond_for_each_slave(bond, slave, i) {
+		if (i == (int)info->slave_id) {
+			found = 1;
+			break;
+		}
+	}
+
+	read_unlock_bh(&bond->lock);
+
+	if (found) {
+		strcpy(info->slave_name, slave->dev->name);
+		info->link = slave->link;
+		info->state = slave->state;
+		info->link_failure_count = slave->link_failure_count;
+	} else {
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+/*-------------------------------- Monitoring -------------------------------*/
+
+/* this function is called regularly to monitor each slave's link. */
+static void bond_mii_monitor(struct net_device *bond_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct slave *slave, *oldcurrent;
+	int do_failover = 0;
+	int delta_in_ticks;
+	int i;
+
+	read_lock(&bond->lock);
+
+	delta_in_ticks = (bond->params.miimon * HZ) / 1000;
+
+	if (bond->kill_timers) {
+		goto out;
+	}
+
+	if (bond->slave_cnt == 0) {
+		goto re_arm;
+	}
+
+	/* we will try to read the link status of each of our slaves, and
+	 * set their IFF_RUNNING flag appropriately. For each slave not
+	 * supporting MII status, we won't do anything so that a user-space
+	 * program could monitor the link itself if needed.
+	 */
+
+	read_lock(&bond->curr_slave_lock);
+	oldcurrent = bond->curr_active_slave;
+	read_unlock(&bond->curr_slave_lock);
+
+	bond_for_each_slave(bond, slave, i) {
+		struct net_device *slave_dev = slave->dev;
+		int link_state;
+		u16 old_speed = slave->speed;
+		u8 old_duplex = slave->duplex;
+
+		link_state = bond_check_dev_link(bond, slave_dev, 0);
+
+		switch (slave->link) {
+		case BOND_LINK_UP:	/* the link was up */
+			if (link_state == BMSR_LSTATUS) {
+				/* link stays up, nothing more to do */
+				break;
+			} else { /* link going down */
+				slave->link  = BOND_LINK_FAIL;
+				slave->delay = bond->params.downdelay;
+
+				if (slave->link_failure_count < UINT_MAX) {
+					slave->link_failure_count++;
+				}
+
+				if (bond->params.downdelay) {
+					printk(KERN_INFO DRV_NAME
+					       ": %s: link status down for %s "
+					       "interface %s, disabling it in "
+					       "%d ms.\n",
+					       bond_dev->name,
+					       IS_UP(slave_dev)
+					       ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
+						  ? ((slave == oldcurrent)
+						     ? "active " : "backup ")
+						  : "")
+					       : "idle ",
+					       slave_dev->name,
+					       bond->params.downdelay * bond->params.miimon);
+				}
+			}
+			/* no break ! fall through the BOND_LINK_FAIL test to
+			   ensure proper action to be taken
+			*/
+		case BOND_LINK_FAIL:	/* the link has just gone down */
+			if (link_state != BMSR_LSTATUS) {
+				/* link stays down */
+				if (slave->delay <= 0) {
+					/* link down for too long time */
+					slave->link = BOND_LINK_DOWN;
+
+					/* in active/backup mode, we must
+					 * completely disable this interface
+					 */
+					if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
+					    (bond->params.mode == BOND_MODE_8023AD)) {
+						bond_set_slave_inactive_flags(slave);
+					}
+
+					printk(KERN_INFO DRV_NAME
+					       ": %s: link status definitely "
+					       "down for interface %s, "
+					       "disabling it\n",
+					       bond_dev->name,
+					       slave_dev->name);
+
+					/* notify ad that the link status has changed */
+					if (bond->params.mode == BOND_MODE_8023AD) {
+						bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
+					}
+
+					if ((bond->params.mode == BOND_MODE_TLB) ||
+					    (bond->params.mode == BOND_MODE_ALB)) {
+						bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
+					}
+
+					if (slave == oldcurrent) {
+						do_failover = 1;
+					}
+				} else {
+					slave->delay--;
+				}
+			} else {
+				/* link up again */
+				slave->link  = BOND_LINK_UP;
+				slave->jiffies = jiffies;
+				printk(KERN_INFO DRV_NAME
+				       ": %s: link status up again after %d "
+				       "ms for interface %s.\n",
+				       bond_dev->name,
+				       (bond->params.downdelay - slave->delay) * bond->params.miimon,
+				       slave_dev->name);
+			}
+			break;
+		case BOND_LINK_DOWN:	/* the link was down */
+			if (link_state != BMSR_LSTATUS) {
+				/* the link stays down, nothing more to do */
+				break;
+			} else {	/* link going up */
+				slave->link  = BOND_LINK_BACK;
+				slave->delay = bond->params.updelay;
+
+				if (bond->params.updelay) {
+					/* if updelay == 0, no need to
+					   advertise about a 0 ms delay */
+					printk(KERN_INFO DRV_NAME
+					       ": %s: link status up for "
+					       "interface %s, enabling it "
+					       "in %d ms.\n",
+					       bond_dev->name,
+					       slave_dev->name,
+					       bond->params.updelay * bond->params.miimon);
+				}
+			}
+			/* no break ! fall through the BOND_LINK_BACK state in
+			   case there's something to do.
+			*/
+		case BOND_LINK_BACK:	/* the link has just come back */
+			if (link_state != BMSR_LSTATUS) {
+				/* link down again */
+				slave->link  = BOND_LINK_DOWN;
+
+				printk(KERN_INFO DRV_NAME
+				       ": %s: link status down again after %d "
+				       "ms for interface %s.\n",
+				       bond_dev->name,
+				       (bond->params.updelay - slave->delay) * bond->params.miimon,
+				       slave_dev->name);
+			} else {
+				/* link stays up */
+				if (slave->delay == 0) {
+					/* now the link has been up for long time enough */
+					slave->link = BOND_LINK_UP;
+					slave->jiffies = jiffies;
+
+					if (bond->params.mode == BOND_MODE_8023AD) {
+						/* prevent it from being the active one */
+						slave->state = BOND_STATE_BACKUP;
+					} else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
+						/* make it immediately active */
+						slave->state = BOND_STATE_ACTIVE;
+					} else if (slave != bond->primary_slave) {
+						/* prevent it from being the active one */
+						slave->state = BOND_STATE_BACKUP;
+					}
+
+					printk(KERN_INFO DRV_NAME
+					       ": %s: link status definitely "
+					       "up for interface %s.\n",
+					       bond_dev->name,
+					       slave_dev->name);
+
+					/* notify ad that the link status has changed */
+					if (bond->params.mode == BOND_MODE_8023AD) {
+						bond_3ad_handle_link_change(slave, BOND_LINK_UP);
+					}
+
+					if ((bond->params.mode == BOND_MODE_TLB) ||
+					    (bond->params.mode == BOND_MODE_ALB)) {
+						bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
+					}
+
+					if ((!oldcurrent) ||
+					    (slave == bond->primary_slave)) {
+						do_failover = 1;
+					}
+				} else {
+					slave->delay--;
+				}
+			}
+			break;
+		default:
+			/* Should not happen */
+			printk(KERN_ERR "bonding: Error: %s  Illegal value (link=%d)\n",
+			       slave->dev->name, slave->link);
+			goto out;
+		} /* end of switch (slave->link) */
+
+		bond_update_speed_duplex(slave);
+
+		if (bond->params.mode == BOND_MODE_8023AD) {
+			if (old_speed != slave->speed) {
+				bond_3ad_adapter_speed_changed(slave);
+			}
+
+			if (old_duplex != slave->duplex) {
+				bond_3ad_adapter_duplex_changed(slave);
+			}
+		}
+
+	} /* end of for */
+
+	if (do_failover) {
+		write_lock(&bond->curr_slave_lock);
+
+		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);
+	}
+
+re_arm:
+	if (bond->params.miimon) {
+		mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
+	}
+out:
+	read_unlock(&bond->lock);
+}
+
+static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
+{
+	int i;
+	u32 *targets = bond->params.arp_targets;
+
+	for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
+		arp_send(ARPOP_REQUEST, ETH_P_ARP, targets[i], slave->dev,
+			 my_ip, NULL, slave->dev->dev_addr,
+			 NULL);
+	}
+}
+
+/*
+ * this function is called regularly to monitor each slave's link
+ * ensuring that traffic is being sent and received when arp monitoring
+ * is used in load-balancing mode. if the adapter has been dormant, then an
+ * arp is transmitted to generate traffic. see activebackup_arp_monitor for
+ * arp monitoring in active backup mode.
+ */
+static void bond_loadbalance_arp_mon(struct net_device *bond_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct slave *slave, *oldcurrent;
+	int do_failover = 0;
+	int delta_in_ticks;
+	int i;
+
+	read_lock(&bond->lock);
+
+	delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
+
+	if (bond->kill_timers) {
+		goto out;
+	}
+
+	if (bond->slave_cnt == 0) {
+		goto re_arm;
+	}
+
+	read_lock(&bond->curr_slave_lock);
+	oldcurrent = bond->curr_active_slave;
+	read_unlock(&bond->curr_slave_lock);
+
+	/* see if any of the previous devices are up now (i.e. they have
+	 * xmt and rcv traffic). the curr_active_slave does not come into
+	 * the picture unless it is null. also, slave->jiffies is not needed
+	 * here because we send an arp on each slave and give a slave as
+	 * long as it needs to get the tx/rx within the delta.
+	 * TODO: what about up/down delay in arp mode? it wasn't here before
+	 *       so it can wait
+	 */
+	bond_for_each_slave(bond, slave, i) {
+		if (slave->link != BOND_LINK_UP) {
+			if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
+			    ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
+
+				slave->link  = BOND_LINK_UP;
+				slave->state = BOND_STATE_ACTIVE;
+
+				/* primary_slave has no meaning in round-robin
+				 * mode. the window of a slave being up and
+				 * curr_active_slave being null after enslaving
+				 * is closed.
+				 */
+				if (!oldcurrent) {
+					printk(KERN_INFO DRV_NAME
+					       ": %s: link status definitely "
+					       "up for interface %s, ",
+					       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,
+					       slave->dev->name);
+				}
+			}
+		} else {
+			/* slave->link == BOND_LINK_UP */
+
+			/* not all switches will respond to an arp request
+			 * when the source ip is 0, so don't take the link down
+			 * if we don't know our ip yet
+			 */
+			if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
+			    (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
+			     my_ip)) {
+
+				slave->link  = BOND_LINK_DOWN;
+				slave->state = BOND_STATE_BACKUP;
+
+				if (slave->link_failure_count < UINT_MAX) {
+					slave->link_failure_count++;
+				}
+
+				printk(KERN_INFO DRV_NAME
+				       ": %s: interface %s is now down.\n",
+				       bond_dev->name,
+				       slave->dev->name);
+
+				if (slave == oldcurrent) {
+					do_failover = 1;
+				}
+			}
+		}
+
+		/* note: if switch is in round-robin mode, all links
+		 * must tx arp to ensure all links rx an arp - otherwise
+		 * links may oscillate or not come up at all; if switch is
+		 * in something like xor mode, there is nothing we can
+		 * do - all replies will be rx'ed on same link causing slaves
+		 * to be unstable during low/no traffic periods
+		 */
+		if (IS_UP(slave->dev)) {
+			bond_arp_send_all(bond, slave);
+		}
+	}
+
+	if (do_failover) {
+		write_lock(&bond->curr_slave_lock);
+
+		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);
+	}
+
+re_arm:
+	if (bond->params.arp_interval) {
+		mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
+	}
+out:
+	read_unlock(&bond->lock);
+}
+
+/*
+ * When using arp monitoring in active-backup mode, this function is
+ * called to determine if any backup slaves have went down or a new
+ * current slave needs to be found.
+ * The backup slaves never generate traffic, they are considered up by merely
+ * receiving traffic. If the current slave goes down, each backup slave will
+ * be given the opportunity to tx/rx an arp before being taken down - this
+ * prevents all slaves from being taken down due to the current slave not
+ * sending any traffic for the backups to receive. The arps are not necessarily
+ * necessary, any tx and rx traffic will keep the current slave up. While any
+ * rx traffic will keep the backup slaves up, the current slave is responsible
+ * for generating traffic to keep them up regardless of any other traffic they
+ * may have received.
+ * see loadbalance_arp_monitor for arp monitoring in load balancing mode
+ */
+static void bond_activebackup_arp_mon(struct net_device *bond_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct slave *slave;
+	int delta_in_ticks;
+	int i;
+
+	read_lock(&bond->lock);
+
+	delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
+
+	if (bond->kill_timers) {
+		goto out;
+	}
+
+	if (bond->slave_cnt == 0) {
+		goto re_arm;
+	}
+
+	/* determine if any slave has come up or any backup slave has
+	 * gone down
+	 * TODO: what about up/down delay in arp mode? it wasn't here before
+	 *       so it can wait
+	 */
+	bond_for_each_slave(bond, slave, i) {
+		if (slave->link != BOND_LINK_UP) {
+			if ((jiffies - slave->dev->last_rx) <= delta_in_ticks) {
+
+				slave->link = BOND_LINK_UP;
+
+				write_lock(&bond->curr_slave_lock);
+
+				if ((!bond->curr_active_slave) &&
+				    ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
+					bond_change_active_slave(bond, slave);
+					bond->current_arp_slave = NULL;
+				} else if (bond->curr_active_slave != slave) {
+					/* this slave has just come up but we
+					 * already have a current slave; this
+					 * can also happen if bond_enslave adds
+					 * a new slave that is up while we are
+					 * searching for a new slave
+					 */
+					bond_set_slave_inactive_flags(slave);
+					bond->current_arp_slave = NULL;
+				}
+
+				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);
+				} else {
+					printk(KERN_INFO DRV_NAME
+					       ": %s: backup interface %s is "
+					       "now up\n",
+					       bond_dev->name,
+					       slave->dev->name);
+				}
+
+				write_unlock(&bond->curr_slave_lock);
+			}
+		} else {
+			read_lock(&bond->curr_slave_lock);
+
+			if ((slave != bond->curr_active_slave) &&
+			    (!bond->current_arp_slave) &&
+			    (((jiffies - slave->dev->last_rx) >= 3*delta_in_ticks) &&
+			     my_ip)) {
+				/* a backup slave has gone down; three times
+				 * the delta allows the current slave to be
+				 * taken out before the backup slave.
+				 * note: a non-null current_arp_slave indicates
+				 * the curr_active_slave went down and we are
+				 * searching for a new one; under this
+				 * condition we only take the curr_active_slave
+				 * down - this gives each slave a chance to
+				 * tx/rx traffic before being taken out
+				 */
+
+				read_unlock(&bond->curr_slave_lock);
+
+				slave->link  = BOND_LINK_DOWN;
+
+				if (slave->link_failure_count < UINT_MAX) {
+					slave->link_failure_count++;
+				}
+
+				bond_set_slave_inactive_flags(slave);
+
+				printk(KERN_INFO DRV_NAME
+				       ": %s: backup interface %s is now down\n",
+				       bond_dev->name,
+				       slave->dev->name);
+			} else {
+				read_unlock(&bond->curr_slave_lock);
+			}
+		}
+	}
+
+	read_lock(&bond->curr_slave_lock);
+	slave = bond->curr_active_slave;
+	read_unlock(&bond->curr_slave_lock);
+
+	if (slave) {
+		/* if we have sent traffic in the past 2*arp_intervals but
+		 * haven't xmit and rx traffic in that time interval, select
+		 * a different slave. slave->jiffies is only updated when
+		 * a slave first becomes the curr_active_slave - not necessarily
+		 * after every arp; this ensures the slave has a full 2*delta
+		 * before being taken out. if a primary is being used, check
+		 * if it is up and needs to take over as the curr_active_slave
+		 */
+		if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
+		     (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
+		      my_ip)) &&
+		    ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
+
+			slave->link  = BOND_LINK_DOWN;
+
+			if (slave->link_failure_count < UINT_MAX) {
+				slave->link_failure_count++;
+			}
+
+			printk(KERN_INFO DRV_NAME
+			       ": %s: link status down for active interface "
+			       "%s, disabling it\n",
+			       bond_dev->name,
+			       slave->dev->name);
+
+			write_lock(&bond->curr_slave_lock);
+
+			bond_select_active_slave(bond);
+			slave = bond->curr_active_slave;
+
+			write_unlock(&bond->curr_slave_lock);
+
+			bond->current_arp_slave = slave;
+
+			if (slave) {
+				slave->jiffies = jiffies;
+			}
+		} else if ((bond->primary_slave) &&
+			   (bond->primary_slave != slave) &&
+			   (bond->primary_slave->link == BOND_LINK_UP)) {
+			/* at this point, slave is the curr_active_slave */
+			printk(KERN_INFO DRV_NAME
+			       ": %s: changing from interface %s to primary "
+			       "interface %s\n",
+			       bond_dev->name,
+			       slave->dev->name,
+			       bond->primary_slave->dev->name);
+
+			/* primary is up so switch to it */
+			write_lock(&bond->curr_slave_lock);
+			bond_change_active_slave(bond, bond->primary_slave);
+			write_unlock(&bond->curr_slave_lock);
+
+			slave = bond->primary_slave;
+			slave->jiffies = jiffies;
+		} else {
+			bond->current_arp_slave = NULL;
+		}
+
+		/* the current slave must tx an arp to ensure backup slaves
+		 * rx traffic
+		 */
+		if (slave && my_ip) {
+			bond_arp_send_all(bond, slave);
+		}
+	}
+
+	/* if we don't have a curr_active_slave, search for the next available
+	 * backup slave from the current_arp_slave and make it the candidate
+	 * for becoming the curr_active_slave
+	 */
+	if (!slave) {
+		if (!bond->current_arp_slave) {
+			bond->current_arp_slave = bond->first_slave;
+		}
+
+		if (bond->current_arp_slave) {
+			bond_set_slave_inactive_flags(bond->current_arp_slave);
+
+			/* search for next candidate */
+			bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave) {
+				if (IS_UP(slave->dev)) {
+					slave->link = BOND_LINK_BACK;
+					bond_set_slave_active_flags(slave);
+					bond_arp_send_all(bond, slave);
+					slave->jiffies = jiffies;
+					bond->current_arp_slave = slave;
+					break;
+				}
+
+				/* if the link state is up at this point, we
+				 * mark it down - this can happen if we have
+				 * simultaneous link failures and
+				 * reselect_active_interface doesn't make this
+				 * one the current slave so it is still marked
+				 * up when it is actually down
+				 */
+				if (slave->link == BOND_LINK_UP) {
+					slave->link  = BOND_LINK_DOWN;
+					if (slave->link_failure_count < UINT_MAX) {
+						slave->link_failure_count++;
+					}
+
+					bond_set_slave_inactive_flags(slave);
+
+					printk(KERN_INFO DRV_NAME
+					       ": %s: backup interface %s is "
+					       "now down.\n",
+					       bond_dev->name,
+					       slave->dev->name);
+				}
+			}
+		}
+	}
+
+re_arm:
+	if (bond->params.arp_interval) {
+		mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
+	}
+out:
+	read_unlock(&bond->lock);
+}
+
+/*------------------------------ proc/seq_file-------------------------------*/
+
+#ifdef CONFIG_PROC_FS
+
+#define SEQ_START_TOKEN ((void *)1)
+
+static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	struct bonding *bond = seq->private;
+	loff_t off = 0;
+	struct slave *slave;
+	int i;
+
+	/* make sure the bond won't be taken away */
+	read_lock(&dev_base_lock);
+	read_lock_bh(&bond->lock);
+
+	if (*pos == 0) {
+		return SEQ_START_TOKEN;
+	}
+
+	bond_for_each_slave(bond, slave, i) {
+		if (++off == *pos) {
+			return slave;
+		}
+	}
+
+	return NULL;
+}
+
+static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct bonding *bond = seq->private;
+	struct slave *slave = v;
+
+	++*pos;
+	if (v == SEQ_START_TOKEN) {
+		return bond->first_slave;
+	}
+
+	slave = slave->next;
+
+	return (slave == bond->first_slave) ? NULL : slave;
+}
+
+static void bond_info_seq_stop(struct seq_file *seq, void *v)
+{
+	struct bonding *bond = seq->private;
+
+	read_unlock_bh(&bond->lock);
+	read_unlock(&dev_base_lock);
+}
+
+static void bond_info_show_master(struct seq_file *seq)
+{
+	struct bonding *bond = seq->private;
+	struct slave *curr;
+
+	read_lock(&bond->curr_slave_lock);
+	curr = bond->curr_active_slave;
+	read_unlock(&bond->curr_slave_lock);
+
+	seq_printf(seq, "Bonding Mode: %s\n",
+		   bond_mode_name(bond->params.mode));
+
+	if (USES_PRIMARY(bond->params.mode)) {
+		seq_printf(seq, "Primary Slave: %s\n",
+			   (bond->params.primary[0]) ?
+			   	bond->params.primary : "None");
+
+		seq_printf(seq, "Currently Active Slave: %s\n",
+			   (curr) ? curr->dev->name : "None");
+	}
+
+	seq_printf(seq, "MII Status: %s\n", (curr) ? "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);
+	seq_printf(seq, "Down Delay (ms): %d\n",
+		   bond->params.downdelay * bond->params.miimon);
+
+	if (bond->params.mode == BOND_MODE_8023AD) {
+		struct ad_info ad_info;
+
+		seq_puts(seq, "\n802.3ad info\n");
+		seq_printf(seq, "LACP rate: %s\n",
+			   (bond->params.lacp_fast) ? "fast" : "slow");
+
+		if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
+			seq_printf(seq, "bond %s has no active aggregator\n",
+				   bond->dev->name);
+		} else {
+			seq_printf(seq, "Active Aggregator Info:\n");
+
+			seq_printf(seq, "\tAggregator ID: %d\n",
+				   ad_info.aggregator_id);
+			seq_printf(seq, "\tNumber of ports: %d\n",
+				   ad_info.ports);
+			seq_printf(seq, "\tActor Key: %d\n",
+				   ad_info.actor_key);
+			seq_printf(seq, "\tPartner Key: %d\n",
+				   ad_info.partner_key);
+			seq_printf(seq, "\tPartner Mac Address: %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]);
+		}
+	}
+}
+
+static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
+{
+	struct bonding *bond = seq->private;
+
+	seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
+	seq_printf(seq, "MII Status: %s\n",
+		   (slave->link == BOND_LINK_UP) ?  "up" : "down");
+	seq_printf(seq, "Link Failure Count: %d\n",
+		   slave->link_failure_count);
+
+	if (app_abi_ver >= 1) {
+		seq_printf(seq,
+			   "Permanent HW addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
+			   slave->perm_hwaddr[0],
+			   slave->perm_hwaddr[1],
+			   slave->perm_hwaddr[2],
+			   slave->perm_hwaddr[3],
+			   slave->perm_hwaddr[4],
+			   slave->perm_hwaddr[5]);
+	}
+
+	if (bond->params.mode == BOND_MODE_8023AD) {
+		const struct aggregator *agg
+			= SLAVE_AD_INFO(slave).port.aggregator;
+
+		if (agg) {
+			seq_printf(seq, "Aggregator ID: %d\n",
+				   agg->aggregator_identifier);
+		} else {
+			seq_puts(seq, "Aggregator ID: N/A\n");
+		}
+	}
+}
+
+static int bond_info_seq_show(struct seq_file *seq, void *v)
+{
+	if (v == SEQ_START_TOKEN) {
+		seq_printf(seq, "%s\n", version);
+		bond_info_show_master(seq);
+	} else {
+		bond_info_show_slave(seq, v);
+	}
+
+	return 0;
+}
+
+static struct seq_operations bond_info_seq_ops = {
+	.start = bond_info_seq_start,
+	.next  = bond_info_seq_next,
+	.stop  = bond_info_seq_stop,
+	.show  = bond_info_seq_show,
+};
+
+static int bond_info_open(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq;
+	struct proc_dir_entry *proc;
+	int res;
+
+	res = seq_open(file, &bond_info_seq_ops);
+	if (!res) {
+		/* recover the pointer buried in proc_dir_entry data */
+		seq = file->private_data;
+		proc = PDE(inode);
+		seq->private = proc->data;
+	}
+
+	return res;
+}
+
+static struct file_operations bond_info_fops = {
+	.owner   = THIS_MODULE,
+	.open    = bond_info_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release,
+};
+
+static int bond_create_proc_entry(struct bonding *bond)
+{
+	struct net_device *bond_dev = bond->dev;
+
+	if (bond_proc_dir) {
+		bond->proc_entry = create_proc_entry(bond_dev->name,
+						     S_IRUGO,
+						     bond_proc_dir);
+		if (bond->proc_entry == NULL) {
+			printk(KERN_WARNING DRV_NAME
+			       ": Warning: Cannot create /proc/net/%s/%s\n",
+			       DRV_NAME, bond_dev->name);
+		} else {
+			bond->proc_entry->data = bond;
+			bond->proc_entry->proc_fops = &bond_info_fops;
+			bond->proc_entry->owner = THIS_MODULE;
+			memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
+		}
+	}
+
+	return 0;
+}
+
+static void bond_remove_proc_entry(struct bonding *bond)
+{
+	if (bond_proc_dir && bond->proc_entry) {
+		remove_proc_entry(bond->proc_file_name, bond_proc_dir);
+		memset(bond->proc_file_name, 0, IFNAMSIZ);
+		bond->proc_entry = NULL;
+	}
+}
+
+/* Create the bonding directory under /proc/net, if doesn't exist yet.
+ * Caller must hold rtnl_lock.
+ */
+static void bond_create_proc_dir(void)
+{
+	int len = strlen(DRV_NAME);
+
+	for (bond_proc_dir = proc_net->subdir; bond_proc_dir;
+	     bond_proc_dir = bond_proc_dir->next) {
+		if ((bond_proc_dir->namelen == len) &&
+		    !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
+			break;
+		}
+	}
+
+	if (!bond_proc_dir) {
+		bond_proc_dir = proc_mkdir(DRV_NAME, proc_net);
+		if (bond_proc_dir) {
+			bond_proc_dir->owner = THIS_MODULE;
+		} else {
+			printk(KERN_WARNING DRV_NAME
+				": Warning: cannot create /proc/net/%s\n",
+				DRV_NAME);
+		}
+	}
+}
+
+/* Destroy the bonding directory under /proc/net, if empty.
+ * Caller must hold rtnl_lock.
+ */
+static void bond_destroy_proc_dir(void)
+{
+	struct proc_dir_entry *de;
+
+	if (!bond_proc_dir) {
+		return;
+	}
+
+	/* verify that the /proc dir is empty */
+	for (de = bond_proc_dir->subdir; de; de = de->next) {
+		/* ignore . and .. */
+		if (*(de->name) != '.') {
+			break;
+		}
+	}
+
+	if (de) {
+		if (bond_proc_dir->owner == THIS_MODULE) {
+			bond_proc_dir->owner = NULL;
+		}
+	} else {
+		remove_proc_entry(DRV_NAME, proc_net);
+		bond_proc_dir = NULL;
+	}
+}
+#endif /* CONFIG_PROC_FS */
+
+/*-------------------------- netdev event handling --------------------------*/
+
+/*
+ * Change device name
+ */
+static int bond_event_changename(struct bonding *bond)
+{
+#ifdef CONFIG_PROC_FS
+	bond_remove_proc_entry(bond);
+	bond_create_proc_entry(bond);
+#endif
+
+	return NOTIFY_DONE;
+}
+
+static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
+{
+	struct bonding *event_bond = bond_dev->priv;
+
+	switch (event) {
+	case NETDEV_CHANGENAME:
+		return bond_event_changename(event_bond);
+	case NETDEV_UNREGISTER:
+		/*
+		 * TODO: remove a bond from the list?
+		 */
+		break;
+	default:
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
+{
+	struct net_device *bond_dev = slave_dev->master;
+
+	switch (event) {
+	case NETDEV_UNREGISTER:
+		if (bond_dev) {
+			bond_release(bond_dev, slave_dev);
+		}
+		break;
+	case NETDEV_CHANGE:
+		/*
+		 * TODO: is this what we get if somebody
+		 * sets up a hierarchical bond, then rmmod's
+		 * one of the slave bonding devices?
+		 */
+		break;
+	case NETDEV_DOWN:
+		/*
+		 * ... Or is it this?
+		 */
+		break;
+	case NETDEV_CHANGEMTU:
+		/*
+		 * TODO: Should slaves be allowed to
+		 * independently alter their MTU?  For
+		 * an active-backup bond, slaves need
+		 * not be the same type of device, so
+		 * MTUs may vary.  For other modes,
+		 * slaves arguably should have the
+		 * same MTUs. To do this, we'd need to
+		 * take over the slave's change_mtu
+		 * function for the duration of their
+		 * servitude.
+		 */
+		break;
+	case NETDEV_CHANGENAME:
+		/*
+		 * TODO: handle changing the primary's name
+		 */
+		break;
+	default:
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+/*
+ * bond_netdev_event: handle netdev notifier chain events.
+ *
+ * This function receives events for the netdev chain.  The caller (an
+ * ioctl handler calling notifier_call_chain) holds the necessary
+ * locks for us to safely manipulate the slave devices (RTNL lock,
+ * dev_probe_lock).
+ */
+static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+	struct net_device *event_dev = (struct net_device *)ptr;
+
+	dprintk("event_dev: %s, event: %lx\n",
+		(event_dev ? event_dev->name : "None"),
+		event);
+
+	if (event_dev->flags & IFF_MASTER) {
+		dprintk("IFF_MASTER\n");
+		return bond_master_netdev_event(event, event_dev);
+	}
+
+	if (event_dev->flags & IFF_SLAVE) {
+		dprintk("IFF_SLAVE\n");
+		return bond_slave_netdev_event(event, event_dev);
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block bond_netdev_notifier = {
+	.notifier_call = bond_netdev_event,
+};
+
+/*-------------------------- Packet type handling ---------------------------*/
+
+/* register to receive lacpdus on a bond */
+static void bond_register_lacpdu(struct bonding *bond)
+{
+	struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
+
+	/* initialize packet type */
+	pk_type->type = PKT_TYPE_LACPDU;
+	pk_type->dev = bond->dev;
+	pk_type->func = bond_3ad_lacpdu_recv;
+
+	dev_add_pack(pk_type);
+}
+
+/* unregister to receive lacpdus on a bond */
+static void bond_unregister_lacpdu(struct bonding *bond)
+{
+	dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
+}
+
+/*-------------------------- Device entry points ----------------------------*/
+
+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.
+		 */
+		if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
+			/* something went wrong - fail the open operation */
+			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);
+	}
+
+	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);
+	}
+
+	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;
+		}
+		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);
+
+		/* register to receive LACPDUs */
+		bond_register_lacpdu(bond);
+	}
+
+	return 0;
+}
+
+static int bond_close(struct net_device *bond_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+
+	if (bond->params.mode == BOND_MODE_8023AD) {
+		/* Unregister the receive of LACPDUs */
+		bond_unregister_lacpdu(bond);
+	}
+
+	write_lock_bh(&bond->lock);
+
+	bond_mc_list_destroy(bond);
+
+	/* signal timers not to re-arm */
+	bond->kill_timers = 1;
+
+	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);
+	}
+
+	if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
+		del_timer_sync(&bond->arp_timer);
+	}
+
+	switch (bond->params.mode) {
+	case BOND_MODE_8023AD:
+		del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
+		break;
+	case BOND_MODE_TLB:
+	case BOND_MODE_ALB:
+		del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
+		break;
+	default:
+		break;
+	}
+
+	/* Release the bonded slaves */
+	bond_release_all(bond_dev);
+
+	if ((bond->params.mode == BOND_MODE_TLB) ||
+	    (bond->params.mode == BOND_MODE_ALB)) {
+		/* Must be called only after all
+		 * slaves have been released
+		 */
+		bond_alb_deinitialize(bond);
+	}
+
+	return 0;
+}
+
+static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct net_device_stats *stats = &(bond->stats), *sstats;
+	struct slave *slave;
+	int i;
+
+	memset(stats, 0, sizeof(struct net_device_stats));
+
+	read_lock_bh(&bond->lock);
+
+	bond_for_each_slave(bond, slave, i) {
+		sstats = slave->dev->get_stats(slave->dev);
+
+		stats->rx_packets += sstats->rx_packets;
+		stats->rx_bytes += sstats->rx_bytes;
+		stats->rx_errors += sstats->rx_errors;
+		stats->rx_dropped += sstats->rx_dropped;
+
+		stats->tx_packets += sstats->tx_packets;
+		stats->tx_bytes += sstats->tx_bytes;
+		stats->tx_errors += sstats->tx_errors;
+		stats->tx_dropped += sstats->tx_dropped;
+
+		stats->multicast += sstats->multicast;
+		stats->collisions += sstats->collisions;
+
+		stats->rx_length_errors += sstats->rx_length_errors;
+		stats->rx_over_errors += sstats->rx_over_errors;
+		stats->rx_crc_errors += sstats->rx_crc_errors;
+		stats->rx_frame_errors += sstats->rx_frame_errors;
+		stats->rx_fifo_errors += sstats->rx_fifo_errors;
+		stats->rx_missed_errors += sstats->rx_missed_errors;
+
+		stats->tx_aborted_errors += sstats->tx_aborted_errors;
+		stats->tx_carrier_errors += sstats->tx_carrier_errors;
+		stats->tx_fifo_errors += sstats->tx_fifo_errors;
+		stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
+		stats->tx_window_errors += sstats->tx_window_errors;
+	}
+
+	read_unlock_bh(&bond->lock);
+
+	return stats;
+}
+
+static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
+{
+	struct net_device *slave_dev = NULL;
+	struct ifbond k_binfo;
+	struct ifbond __user *u_binfo = NULL;
+	struct ifslave k_sinfo;
+	struct ifslave __user *u_sinfo = NULL;
+	struct mii_ioctl_data *mii = NULL;
+	int prev_abi_ver = orig_app_abi_ver;
+	int res = 0;
+
+	dprintk("bond_ioctl: master=%s, cmd=%d\n",
+		bond_dev->name, cmd);
+
+	switch (cmd) {
+	case SIOCETHTOOL:
+		return bond_ethtool_ioctl(bond_dev, ifr);
+	case SIOCGMIIPHY:
+		mii = if_mii(ifr);
+		if (!mii) {
+			return -EINVAL;
+		}
+		mii->phy_id = 0;
+		/* Fall Through */
+	case SIOCGMIIREG:
+		/*
+		 * We do this again just in case we were called by SIOCGMIIREG
+		 * instead of SIOCGMIIPHY.
+		 */
+		mii = if_mii(ifr);
+		if (!mii) {
+			return -EINVAL;
+		}
+
+		if (mii->reg_num == 1) {
+			struct bonding *bond = bond_dev->priv;
+			mii->val_out = 0;
+			read_lock_bh(&bond->lock);
+			read_lock(&bond->curr_slave_lock);
+			if (bond->curr_active_slave) {
+				mii->val_out = BMSR_LSTATUS;
+			}
+			read_unlock(&bond->curr_slave_lock);
+			read_unlock_bh(&bond->lock);
+		}
+
+		return 0;
+	case BOND_INFO_QUERY_OLD:
+	case SIOCBONDINFOQUERY:
+		u_binfo = (struct ifbond __user *)ifr->ifr_data;
+
+		if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
+			return -EFAULT;
+		}
+
+		res = bond_info_query(bond_dev, &k_binfo);
+		if (res == 0) {
+			if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
+				return -EFAULT;
+			}
+		}
+
+		return res;
+	case BOND_SLAVE_INFO_QUERY_OLD:
+	case SIOCBONDSLAVEINFOQUERY:
+		u_sinfo = (struct ifslave __user *)ifr->ifr_data;
+
+		if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
+			return -EFAULT;
+		}
+
+		res = bond_slave_info_query(bond_dev, &k_sinfo);
+		if (res == 0) {
+			if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
+				return -EFAULT;
+			}
+		}
+
+		return res;
+	default:
+		/* Go on */
+		break;
+	}
+
+	if (!capable(CAP_NET_ADMIN)) {
+		return -EPERM;
+	}
+
+	if (orig_app_abi_ver == -1) {
+		/* no orig_app_abi_ver was provided yet, so we'll use the
+		 * current one from now on, even if it's 0
+		 */
+		orig_app_abi_ver = app_abi_ver;
+
+	} else if (orig_app_abi_ver != app_abi_ver) {
+		printk(KERN_ERR DRV_NAME
+		       ": Error: already using ifenslave ABI version %d; to "
+		       "upgrade ifenslave to version %d, you must first "
+		       "reload bonding.\n",
+		       orig_app_abi_ver, app_abi_ver);
+		return -EINVAL;
+	}
+
+	slave_dev = dev_get_by_name(ifr->ifr_slave);
+
+	dprintk("slave_dev=%p: \n", slave_dev);
+
+	if (!slave_dev) {
+		res = -ENODEV;
+	} else {
+		dprintk("slave_dev->name=%s: \n", slave_dev->name);
+		switch (cmd) {
+		case BOND_ENSLAVE_OLD:
+		case SIOCBONDENSLAVE:
+			res = bond_enslave(bond_dev, slave_dev);
+			break;
+		case BOND_RELEASE_OLD:
+		case SIOCBONDRELEASE:
+			res = bond_release(bond_dev, slave_dev);
+			break;
+		case BOND_SETHWADDR_OLD:
+		case SIOCBONDSETHWADDR:
+			res = bond_sethwaddr(bond_dev, slave_dev);
+			break;
+		case BOND_CHANGE_ACTIVE_OLD:
+		case SIOCBONDCHANGEACTIVE:
+			res = bond_ioctl_change_active(bond_dev, slave_dev);
+			break;
+		default:
+			res = -EOPNOTSUPP;
+		}
+
+		dev_put(slave_dev);
+	}
+
+	if (res < 0) {
+		/* The ioctl failed, so there's no point in changing the
+		 * orig_app_abi_ver. We'll restore it's value just in case
+		 * we've changed it earlier in this function.
+		 */
+		orig_app_abi_ver = prev_abi_ver;
+	}
+
+	return res;
+}
+
+static void bond_set_multicast_list(struct net_device *bond_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct dev_mc_list *dmi;
+
+	write_lock_bh(&bond->lock);
+
+	/*
+	 * Do promisc before checking multicast_mode
+	 */
+	if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
+		bond_set_promiscuity(bond, 1);
+	}
+
+	if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
+		bond_set_promiscuity(bond, -1);
+	}
+
+	/* set allmulti flag to slaves */
+	if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
+		bond_set_allmulti(bond, 1);
+	}
+
+	if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
+		bond_set_allmulti(bond, -1);
+	}
+
+	bond->flags = bond_dev->flags;
+
+	/* looking for addresses to add to slaves' mc list */
+	for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
+		if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
+			bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
+		}
+	}
+
+	/* looking for addresses to delete from slaves' list */
+	for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
+		if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
+			bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
+		}
+	}
+
+	/* save master's multicast list */
+	bond_mc_list_destroy(bond);
+	bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
+
+	write_unlock_bh(&bond->lock);
+}
+
+/*
+ * Change the MTU of all of a master's slaves to match the master
+ */
+static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct slave *slave, *stop_at;
+	int res = 0;
+	int i;
+
+	dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
+		(bond_dev ? bond_dev->name : "None"), new_mtu);
+
+	/* Can't hold bond->lock with bh disabled here since
+	 * some base drivers panic. On the other hand we can't
+	 * hold bond->lock without bh disabled because we'll
+	 * deadlock. The only solution is to rely on the fact
+	 * that we're under rtnl_lock here, and the slaves
+	 * list won't change. This doesn't solve the problem
+	 * of setting the slave's MTU while it is
+	 * transmitting, but the assumption is that the base
+	 * driver can handle that.
+	 *
+	 * TODO: figure out a way to safely iterate the slaves
+	 * list, but without holding a lock around the actual
+	 * call to the base driver.
+	 */
+
+	bond_for_each_slave(bond, slave, i) {
+		dprintk("s %p s->p %p c_m %p\n", slave,
+			slave->prev, slave->dev->change_mtu);
+		res = dev_set_mtu(slave->dev, new_mtu);
+
+		if (res) {
+			/* If we failed to set the slave's mtu to the new value
+			 * we must abort the operation even in ACTIVE_BACKUP
+			 * mode, because if we allow the backup slaves to have
+			 * different mtu values than the active slave we'll
+			 * need to change their mtu when doing a failover. That
+			 * means changing their mtu from timer context, which
+			 * is probably not a good idea.
+			 */
+			dprintk("err %d %s\n", res, slave->dev->name);
+			goto unwind;
+		}
+	}
+
+	bond_dev->mtu = new_mtu;
+
+	return 0;
+
+unwind:
+	/* unwind from head to the slave that failed */
+	stop_at = slave;
+	bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
+		int tmp_res;
+
+		tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
+		if (tmp_res) {
+			dprintk("unwind err %d dev %s\n", tmp_res,
+				slave->dev->name);
+		}
+	}
+
+	return res;
+}
+
+/*
+ * Change HW address
+ *
+ * Note that many devices must be down to change the HW address, and
+ * downing the master releases all slaves.  We can make bonds full of
+ * bonding devices to test this, however.
+ */
+static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct sockaddr *sa = addr, tmp_sa;
+	struct slave *slave, *stop_at;
+	int res = 0;
+	int i;
+
+	dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
+
+	if (!is_valid_ether_addr(sa->sa_data)) {
+		return -EADDRNOTAVAIL;
+	}
+
+	/* Can't hold bond->lock with bh disabled here since
+	 * some base drivers panic. On the other hand we can't
+	 * hold bond->lock without bh disabled because we'll
+	 * deadlock. The only solution is to rely on the fact
+	 * that we're under rtnl_lock here, and the slaves
+	 * list won't change. This doesn't solve the problem
+	 * of setting the slave's hw address while it is
+	 * transmitting, but the assumption is that the base
+	 * driver can handle that.
+	 *
+	 * TODO: figure out a way to safely iterate the slaves
+	 * list, but without holding a lock around the actual
+	 * call to the base driver.
+	 */
+
+	bond_for_each_slave(bond, slave, i) {
+		dprintk("slave %p %s\n", slave, slave->dev->name);
+
+		if (slave->dev->set_mac_address == NULL) {
+			res = -EOPNOTSUPP;
+			dprintk("EOPNOTSUPP %s\n", slave->dev->name);
+			goto unwind;
+		}
+
+		res = dev_set_mac_address(slave->dev, addr);
+		if (res) {
+			/* TODO: consider downing the slave
+			 * and retry ?
+			 * User should expect communications
+			 * breakage anyway until ARP finish
+			 * updating, so...
+			 */
+			dprintk("err %d %s\n", res, slave->dev->name);
+			goto unwind;
+		}
+	}
+
+	/* success */
+	memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
+	return 0;
+
+unwind:
+	memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
+	tmp_sa.sa_family = bond_dev->type;
+
+	/* unwind from head to the slave that failed */
+	stop_at = slave;
+	bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
+		int tmp_res;
+
+		tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
+		if (tmp_res) {
+			dprintk("unwind err %d dev %s\n", tmp_res,
+				slave->dev->name);
+		}
+	}
+
+	return res;
+}
+
+static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct slave *slave, *start_at;
+	int i;
+	int res = 1;
+
+	read_lock(&bond->lock);
+
+	if (!BOND_IS_OK(bond)) {
+		goto out;
+	}
+
+	read_lock(&bond->curr_slave_lock);
+	slave = start_at = bond->curr_active_slave;
+	read_unlock(&bond->curr_slave_lock);
+
+	if (!slave) {
+		goto out;
+	}
+
+	bond_for_each_slave_from(bond, slave, i, start_at) {
+		if (IS_UP(slave->dev) &&
+		    (slave->link == BOND_LINK_UP) &&
+		    (slave->state == BOND_STATE_ACTIVE)) {
+			res = bond_dev_queue_xmit(bond, skb, slave->dev);
+
+			write_lock(&bond->curr_slave_lock);
+			bond->curr_active_slave = slave->next;
+			write_unlock(&bond->curr_slave_lock);
+
+			break;
+		}
+	}
+
+
+out:
+	if (res) {
+		/* no suitable interface, frame not sent */
+		dev_kfree_skb(skb);
+	}
+	read_unlock(&bond->lock);
+	return 0;
+}
+
+/*
+ * in active-backup mode, we know that bond->curr_active_slave is always valid if
+ * the bond has a usable interface.
+ */
+static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	int res = 1;
+
+	/* if we are sending arp packets, try to at least
+	   identify our own ip address */
+	if (bond->params.arp_interval && !my_ip &&
+		(skb->protocol == __constant_htons(ETH_P_ARP))) {
+		char *the_ip = (char *)skb->data +
+				sizeof(struct ethhdr) +
+				sizeof(struct arphdr) +
+				ETH_ALEN;
+		memcpy(&my_ip, the_ip, 4);
+	}
+
+	read_lock(&bond->lock);
+	read_lock(&bond->curr_slave_lock);
+
+	if (!BOND_IS_OK(bond)) {
+		goto out;
+	}
+
+	if (bond->curr_active_slave) { /* one usable interface */
+		res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
+	}
+
+out:
+	if (res) {
+		/* no suitable interface, frame not sent */
+		dev_kfree_skb(skb);
+	}
+	read_unlock(&bond->curr_slave_lock);
+	read_unlock(&bond->lock);
+	return 0;
+}
+
+/*
+ * in XOR mode, we determine the output device by performing xor on
+ * the source and destination hw adresses.  If this device is not
+ * enabled, find the next slave following this xor slave.
+ */
+static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct ethhdr *data = (struct ethhdr *)skb->data;
+	struct slave *slave, *start_at;
+	int slave_no;
+	int i;
+	int res = 1;
+
+	read_lock(&bond->lock);
+
+	if (!BOND_IS_OK(bond)) {
+		goto out;
+	}
+
+	slave_no = (data->h_dest[5]^bond_dev->dev_addr[5]) % bond->slave_cnt;
+
+	bond_for_each_slave(bond, slave, i) {
+		slave_no--;
+		if (slave_no < 0) {
+			break;
+		}
+	}
+
+	start_at = slave;
+
+	bond_for_each_slave_from(bond, slave, i, start_at) {
+		if (IS_UP(slave->dev) &&
+		    (slave->link == BOND_LINK_UP) &&
+		    (slave->state == BOND_STATE_ACTIVE)) {
+			res = bond_dev_queue_xmit(bond, skb, slave->dev);
+			break;
+		}
+	}
+
+out:
+	if (res) {
+		/* no suitable interface, frame not sent */
+		dev_kfree_skb(skb);
+	}
+	read_unlock(&bond->lock);
+	return 0;
+}
+
+/*
+ * in broadcast mode, we send everything to all usable interfaces.
+ */
+static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	struct slave *slave, *start_at;
+	struct net_device *tx_dev = NULL;
+	int i;
+	int res = 1;
+
+	read_lock(&bond->lock);
+
+	if (!BOND_IS_OK(bond)) {
+		goto out;
+	}
+
+	read_lock(&bond->curr_slave_lock);
+	start_at = bond->curr_active_slave;
+	read_unlock(&bond->curr_slave_lock);
+
+	if (!start_at) {
+		goto out;
+	}
+
+	bond_for_each_slave_from(bond, slave, i, start_at) {
+		if (IS_UP(slave->dev) &&
+		    (slave->link == BOND_LINK_UP) &&
+		    (slave->state == BOND_STATE_ACTIVE)) {
+			if (tx_dev) {
+				struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+				if (!skb2) {
+					printk(KERN_ERR DRV_NAME
+					       ": Error: bond_xmit_broadcast(): "
+					       "skb_clone() failed\n");
+					continue;
+				}
+
+				res = bond_dev_queue_xmit(bond, skb2, tx_dev);
+				if (res) {
+					dev_kfree_skb(skb2);
+					continue;
+				}
+			}
+			tx_dev = slave->dev;
+		}
+	}
+
+	if (tx_dev) {
+		res = bond_dev_queue_xmit(bond, skb, tx_dev);
+	}
+
+out:
+	if (res) {
+		/* no suitable interface, frame not sent */
+		dev_kfree_skb(skb);
+	}
+	/* frame sent to all suitable interfaces */
+	read_unlock(&bond->lock);
+	return 0;
+}
+
+/*------------------------- Device initialization ---------------------------*/
+
+/*
+ * set bond mode specific net device operations
+ */
+static inline void bond_set_mode_ops(struct net_device *bond_dev, int mode)
+{
+	switch (mode) {
+	case BOND_MODE_ROUNDROBIN:
+		bond_dev->hard_start_xmit = bond_xmit_roundrobin;
+		break;
+	case BOND_MODE_ACTIVEBACKUP:
+		bond_dev->hard_start_xmit = bond_xmit_activebackup;
+		break;
+	case BOND_MODE_XOR:
+		bond_dev->hard_start_xmit = bond_xmit_xor;
+		break;
+	case BOND_MODE_BROADCAST:
+		bond_dev->hard_start_xmit = bond_xmit_broadcast;
+		break;
+	case BOND_MODE_8023AD:
+		bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
+		break;
+	case BOND_MODE_TLB:
+	case BOND_MODE_ALB:
+		bond_dev->hard_start_xmit = bond_alb_xmit;
+		bond_dev->set_mac_address = bond_alb_set_mac_address;
+		break;
+	default:
+		/* Should never happen, mode already checked */
+		printk(KERN_ERR DRV_NAME
+		       ": Error: Unknown bonding mode %d\n",
+		       mode);
+		break;
+	}
+}
+
+/*
+ * Does not allocate but creates a /proc entry.
+ * Allowed to fail.
+ */
+static int __init bond_init(struct net_device *bond_dev, struct bond_params *params)
+{
+	struct bonding *bond = bond_dev->priv;
+
+	dprintk("Begin bond_init for %s\n", bond_dev->name);
+
+	/* initialize rwlocks */
+	rwlock_init(&bond->lock);
+	rwlock_init(&bond->curr_slave_lock);
+
+	bond->params = *params; /* copy params struct */
+
+	/* Initialize pointers */
+	bond->first_slave = NULL;
+	bond->curr_active_slave = NULL;
+	bond->current_arp_slave = NULL;
+	bond->primary_slave = NULL;
+	bond->dev = bond_dev;
+	INIT_LIST_HEAD(&bond->vlan_list);
+
+	/* Initialize the device entry points */
+	bond_dev->open = bond_open;
+	bond_dev->stop = bond_close;
+	bond_dev->get_stats = bond_get_stats;
+	bond_dev->do_ioctl = bond_do_ioctl;
+	bond_dev->set_multicast_list = bond_set_multicast_list;
+	bond_dev->change_mtu = bond_change_mtu;
+	bond_dev->set_mac_address = bond_set_mac_address;
+
+	bond_set_mode_ops(bond_dev, bond->params.mode);
+
+	bond_dev->destructor = free_netdev;
+
+	/* Initialize the device options */
+	bond_dev->tx_queue_len = 0;
+	bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
+
+	/* At first, we block adding VLANs. That's the only way to
+	 * prevent problems that occur when adding VLANs over an
+	 * empty bond. The block will be removed once non-challenged
+	 * slaves are enslaved.
+	 */
+	bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
+
+	/* don't acquire bond device's xmit_lock when 
+	 * transmitting */
+	bond_dev->features |= NETIF_F_LLTX;
+
+	/* By default, we declare the bond to be fully
+	 * VLAN hardware accelerated capable. Special
+	 * care is taken in the various xmit functions
+	 * when there are slaves that are not hw accel
+	 * capable
+	 */
+	bond_dev->vlan_rx_register = bond_vlan_rx_register;
+	bond_dev->vlan_rx_add_vid  = bond_vlan_rx_add_vid;
+	bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
+	bond_dev->features |= (NETIF_F_HW_VLAN_TX |
+			       NETIF_F_HW_VLAN_RX |
+			       NETIF_F_HW_VLAN_FILTER);
+
+#ifdef CONFIG_PROC_FS
+	bond_create_proc_entry(bond);
+#endif
+
+	list_add_tail(&bond->bond_list, &bond_dev_list);
+
+	return 0;
+}
+
+/* De-initialize device specific data.
+ * Caller must hold rtnl_lock.
+ */
+static inline void bond_deinit(struct net_device *bond_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+
+	list_del(&bond->bond_list);
+
+#ifdef CONFIG_PROC_FS
+	bond_remove_proc_entry(bond);
+#endif
+}
+
+/* Unregister and free all bond devices.
+ * Caller must hold rtnl_lock.
+ */
+static void bond_free_all(void)
+{
+	struct bonding *bond, *nxt;
+
+	list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
+		struct net_device *bond_dev = bond->dev;
+
+		unregister_netdevice(bond_dev);
+		bond_deinit(bond_dev);
+	}
+
+#ifdef CONFIG_PROC_FS
+	bond_destroy_proc_dir();
+#endif
+}
+
+/*------------------------- Module initialization ---------------------------*/
+
+/*
+ * Convert string input module parms.  Accept either the
+ * number of the mode or its string name.
+ */
+static inline int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
+{
+	int i;
+
+	for (i = 0; tbl[i].modename; i++) {
+		if ((isdigit(*mode_arg) &&
+		     tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
+		    (strncmp(mode_arg, tbl[i].modename,
+			     strlen(tbl[i].modename)) == 0)) {
+			return tbl[i].mode;
+		}
+	}
+
+	return -1;
+}
+
+static int bond_check_params(struct bond_params *params)
+{
+	/*
+	 * Convert string parameters.
+	 */
+	if (mode) {
+		bond_mode = bond_parse_parm(mode, bond_mode_tbl);
+		if (bond_mode == -1) {
+			printk(KERN_ERR DRV_NAME
+			       ": Error: Invalid bonding mode \"%s\"\n",
+			       mode == NULL ? "NULL" : mode);
+			return -EINVAL;
+		}
+	}
+
+	if (lacp_rate) {
+		if (bond_mode != BOND_MODE_8023AD) {
+			printk(KERN_INFO DRV_NAME
+			       ": lacp_rate param is irrelevant in mode %s\n",
+			       bond_mode_name(bond_mode));
+		} else {
+			lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
+			if (lacp_fast == -1) {
+				printk(KERN_ERR DRV_NAME
+				       ": Error: Invalid lacp rate \"%s\"\n",
+				       lacp_rate == NULL ? "NULL" : lacp_rate);
+				return -EINVAL;
+			}
+		}
+	}
+
+	if (max_bonds < 1 || max_bonds > INT_MAX) {
+		printk(KERN_WARNING DRV_NAME
+		       ": Warning: max_bonds (%d) not in range %d-%d, so it "
+		       "was reset to BOND_DEFAULT_MAX_BONDS (%d)",
+		       max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
+		max_bonds = BOND_DEFAULT_MAX_BONDS;
+	}
+
+	if (miimon < 0) {
+		printk(KERN_WARNING DRV_NAME
+		       ": Warning: miimon module parameter (%d), "
+		       "not in range 0-%d, so it was reset to %d\n",
+		       miimon, INT_MAX, BOND_LINK_MON_INTERV);
+		miimon = BOND_LINK_MON_INTERV;
+	}
+
+	if (updelay < 0) {
+		printk(KERN_WARNING DRV_NAME
+		       ": Warning: updelay module parameter (%d), "
+		       "not in range 0-%d, so it was reset to 0\n",
+		       updelay, INT_MAX);
+		updelay = 0;
+	}
+
+	if (downdelay < 0) {
+		printk(KERN_WARNING DRV_NAME
+		       ": Warning: downdelay module parameter (%d), "
+		       "not in range 0-%d, so it was reset to 0\n",
+		       downdelay, INT_MAX);
+		downdelay = 0;
+	}
+
+	if ((use_carrier != 0) && (use_carrier != 1)) {
+		printk(KERN_WARNING DRV_NAME
+		       ": Warning: use_carrier module parameter (%d), "
+		       "not of valid value (0/1), so it was set to 1\n",
+		       use_carrier);
+		use_carrier = 1;
+	}
+
+	/* reset values for 802.3ad */
+	if (bond_mode == BOND_MODE_8023AD) {
+		if (!miimon) {
+			printk(KERN_WARNING DRV_NAME
+			       ": Warning: miimon must be specified, "
+			       "otherwise bonding will not detect link "
+			       "failure, speed and duplex which are "
+			       "essential for 802.3ad operation\n");
+			printk(KERN_WARNING "Forcing miimon to 100msec\n");
+			miimon = 100;
+		}
+	}
+
+	/* reset values for TLB/ALB */
+	if ((bond_mode == BOND_MODE_TLB) ||
+	    (bond_mode == BOND_MODE_ALB)) {
+		if (!miimon) {
+			printk(KERN_WARNING DRV_NAME
+			       ": Warning: miimon must be specified, "
+			       "otherwise bonding will not detect link "
+			       "failure and link speed which are essential "
+			       "for TLB/ALB load balancing\n");
+			printk(KERN_WARNING "Forcing miimon to 100msec\n");
+			miimon = 100;
+		}
+	}
+
+	if (bond_mode == BOND_MODE_ALB) {
+		printk(KERN_NOTICE DRV_NAME
+		       ": In ALB mode you might experience client "
+		       "disconnections upon reconnection of a link if the "
+		       "bonding module updelay parameter (%d msec) is "
+		       "incompatible with the forwarding delay time of the "
+		       "switch\n",
+		       updelay);
+	}
+
+	if (!miimon) {
+		if (updelay || downdelay) {
+			/* just warn the user the up/down delay will have
+			 * no effect since miimon is zero...
+			 */
+			printk(KERN_WARNING DRV_NAME
+			       ": Warning: miimon module parameter not set "
+			       "and updelay (%d) or downdelay (%d) module "
+			       "parameter is set; updelay and downdelay have "
+			       "no effect unless miimon is set\n",
+			       updelay, downdelay);
+		}
+	} else {
+		/* don't allow arp monitoring */
+		if (arp_interval) {
+			printk(KERN_WARNING DRV_NAME
+			       ": Warning: miimon (%d) and arp_interval (%d) "
+			       "can't be used simultaneously, disabling ARP "
+			       "monitoring\n",
+			       miimon, arp_interval);
+			arp_interval = 0;
+		}
+
+		if ((updelay % miimon) != 0) {
+			printk(KERN_WARNING DRV_NAME
+			       ": Warning: updelay (%d) is not a multiple "
+			       "of miimon (%d), updelay rounded to %d ms\n",
+			       updelay, miimon, (updelay / miimon) * miimon);
+		}
+
+		updelay /= miimon;
+
+		if ((downdelay % miimon) != 0) {
+			printk(KERN_WARNING DRV_NAME
+			       ": Warning: downdelay (%d) is not a multiple "
+			       "of miimon (%d), downdelay rounded to %d ms\n",
+			       downdelay, miimon,
+			       (downdelay / miimon) * miimon);
+		}
+
+		downdelay /= miimon;
+	}
+
+	if (arp_interval < 0) {
+		printk(KERN_WARNING DRV_NAME
+		       ": Warning: arp_interval module parameter (%d) "
+		       ", not in range 0-%d, so it was reset to %d\n",
+		       arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
+		arp_interval = BOND_LINK_ARP_INTERV;
+	}
+
+	for (arp_ip_count = 0;
+	     (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
+	     arp_ip_count++) {
+		/* not complete check, but should be good enough to
+		   catch mistakes */
+		if (!isdigit(arp_ip_target[arp_ip_count][0])) {
+			printk(KERN_WARNING DRV_NAME
+			       ": Warning: bad arp_ip_target module parameter "
+			       "(%s), ARP monitoring will not be performed\n",
+			       arp_ip_target[arp_ip_count]);
+			arp_interval = 0;
+		} else {
+			u32 ip = in_aton(arp_ip_target[arp_ip_count]);
+			arp_target[arp_ip_count] = ip;
+		}
+	}
+
+	if (arp_interval && !arp_ip_count) {
+		/* don't allow arping if no arp_ip_target given... */
+		printk(KERN_WARNING DRV_NAME
+		       ": Warning: arp_interval module parameter (%d) "
+		       "specified without providing an arp_ip_target "
+		       "parameter, arp_interval was reset to 0\n",
+		       arp_interval);
+		arp_interval = 0;
+	}
+
+	if (miimon) {
+		printk(KERN_INFO DRV_NAME
+		       ": MII link monitoring set to %d ms\n",
+		       miimon);
+	} else if (arp_interval) {
+		int i;
+
+		printk(KERN_INFO DRV_NAME
+		       ": ARP monitoring set to %d ms with %d target(s):",
+		       arp_interval, arp_ip_count);
+
+		for (i = 0; i < arp_ip_count; i++)
+			printk (" %s", arp_ip_target[i]);
+
+		printk("\n");
+
+	} else {
+		/* miimon and arp_interval not set, we need one so things
+		 * work as expected, see bonding.txt for details
+		 */
+		printk(KERN_WARNING DRV_NAME
+		       ": Warning: either miimon or arp_interval and "
+		       "arp_ip_target module parameters must be specified, "
+		       "otherwise bonding will not detect link failures! see "
+		       "bonding.txt for details.\n");
+	}
+
+	if (primary && !USES_PRIMARY(bond_mode)) {
+		/* currently, using a primary only makes sense
+		 * in active backup, TLB or ALB modes
+		 */
+		printk(KERN_WARNING DRV_NAME
+		       ": Warning: %s primary device specified but has no "
+		       "effect in %s mode\n",
+		       primary, bond_mode_name(bond_mode));
+		primary = NULL;
+	}
+
+	/* fill params struct with the proper values */
+	params->mode = bond_mode;
+	params->miimon = miimon;
+	params->arp_interval = arp_interval;
+	params->updelay = updelay;
+	params->downdelay = downdelay;
+	params->use_carrier = use_carrier;
+	params->lacp_fast = lacp_fast;
+	params->primary[0] = 0;
+
+	if (primary) {
+		strncpy(params->primary, primary, IFNAMSIZ);
+		params->primary[IFNAMSIZ - 1] = 0;
+	}
+
+	memcpy(params->arp_targets, arp_target, sizeof(arp_target));
+
+	return 0;
+}
+
+static int __init bonding_init(void)
+{
+	struct bond_params params;
+	int i;
+	int res;
+
+	printk(KERN_INFO "%s", version);
+
+	res = bond_check_params(&params);
+	if (res) {
+		return res;
+	}
+
+	rtnl_lock();
+
+#ifdef CONFIG_PROC_FS
+	bond_create_proc_dir();
+#endif
+
+	for (i = 0; i < max_bonds; i++) {
+		struct net_device *bond_dev;
+
+		bond_dev = alloc_netdev(sizeof(struct bonding), "", ether_setup);
+		if (!bond_dev) {
+			res = -ENOMEM;
+			goto out_err;
+		}
+
+		res = dev_alloc_name(bond_dev, "bond%d");
+		if (res < 0) {
+			free_netdev(bond_dev);
+			goto out_err;
+		}
+
+		/* bond_init() must be called after dev_alloc_name() (for the
+		 * /proc files), but before register_netdevice(), because we
+		 * need to set function pointers.
+		 */
+		res = bond_init(bond_dev, &params);
+		if (res < 0) {
+			free_netdev(bond_dev);
+			goto out_err;
+		}
+
+		SET_MODULE_OWNER(bond_dev);
+
+		res = register_netdevice(bond_dev);
+		if (res < 0) {
+			bond_deinit(bond_dev);
+			free_netdev(bond_dev);
+			goto out_err;
+		}
+	}
+
+	rtnl_unlock();
+	register_netdevice_notifier(&bond_netdev_notifier);
+
+	return 0;
+
+out_err:
+	/* free and unregister all bonds that were successfully added */
+	bond_free_all();
+
+	rtnl_unlock();
+
+	return res;
+}
+
+static void __exit bonding_exit(void)
+{
+	unregister_netdevice_notifier(&bond_netdev_notifier);
+
+	rtnl_lock();
+	bond_free_all();
+	rtnl_unlock();
+}
+
+module_init(bonding_init);
+module_exit(bonding_exit);
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
+MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
+MODULE_SUPPORTED_DEVICE("most ethernet devices");
+
+/*
+ * Local variables:
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ *  tab-width: 8
+ * End:
+ */
+