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e5ed639913
linux-next/drivers/net/bonding/bond_main.c
Herbert Xu e5ed639913 [IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl 
The following patch renames __in_dev_get() to __in_dev_get_rtnl() and
introduces __in_dev_get_rcu() to cover the second case.

1) RCU with refcnt should use in_dev_get().
2) RCU without refcnt should use __in_dev_get_rcu().
3) All others must hold RTNL and use __in_dev_get_rtnl().

There is one exception in net/ipv4/route.c which is in fact a pre-existing
race condition.  I've marked it as such so that we remember to fix it.

This patch is based on suggestions and prior work by Suzanne Wood and
Paul McKenney.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-03 14:35:55 -07:00

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/*
* 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.
* 2005/06/05 - Jay Vosburgh <fubar@us.ibm.com>
* - Support for generating gratuitous ARPs in active-backup mode.
* Includes support for VLAN tagging all bonding-generated ARPs
* as needed. Set version to 2.6.2.
* 2005/06/08 - Jason Gabler <jygabler at lbl dot gov>
* - alternate hashing policy support for mode 2
* * Added kernel parameter "xmit_hash_policy" to allow the selection
* of different hashing policies for mode 2. The original mode 2
* policy is the default, now found in xmit_hash_policy_layer2().
* * Added xmit_hash_policy_layer34()
* - Modified by Jay Vosburgh <fubar@us.ibm.com> to also support mode 4.
* Set version to 2.6.3.
*/
//#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 <net/ip.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.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 <net/route.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 char *xmit_hash_policy = 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(xmit_hash_policy, charp, 0);
MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method : 0 for layer 2 (default), 1 for layer 3+4");
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 int bond_mode = BOND_MODE_ROUNDROBIN;
static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
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},
};
static struct bond_parm_tbl xmit_hashtype_tbl[] = {
{ "layer2", BOND_XMIT_POLICY_LAYER2},
{ "layer3+4", BOND_XMIT_POLICY_LAYER34},
{ NULL, -1},
};
/*-------------------------- Forward declarations ---------------------------*/
static inline void bond_set_mode_ops(struct bonding *bond, int mode);
static void bond_send_gratuitous_arp(struct bonding *bond);
/*---------------------------- 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;
vlan->vlan_ip = 0;
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 (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;
}
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);
}
bond_send_gratuitous_arp(bond);
}
}
/**
* 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;
}
#define BOND_INTERSECT_FEATURES \
(NETIF_F_SG|NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM)
/*
* Compute the features available to the bonding device by
* intersection of all of the slave devices' BOND_INTERSECT_FEATURES.
* Call this after attaching or detaching a slave to update the
* bond's features.
*/
static int bond_compute_features(struct bonding *bond)
{
int i;
struct slave *slave;
struct net_device *bond_dev = bond->dev;
int features = bond->bond_features;
bond_for_each_slave(bond, slave, i) {
struct net_device * slave_dev = slave->dev;
if (i == 0) {
features |= BOND_INTERSECT_FEATURES;
}
features &=
~(~slave_dev->features & BOND_INTERSECT_FEATURES);
}
/* turn off NETIF_F_SG if we need a csum and h/w can't do it */
if ((features & NETIF_F_SG) &&
!(features & (NETIF_F_IP_CSUM |
NETIF_F_NO_CSUM |
NETIF_F_HW_CSUM))) {
features &= ~NETIF_F_SG;
}
bond_dev->features = features;
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 (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
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;
bond_compute_features(bond);
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);
bond_compute_features(bond);
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);
}
bond_compute_features(bond);
/* 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 u32 bond_glean_dev_ip(struct net_device *dev)
{
struct in_device *idev;
struct in_ifaddr *ifa;
u32 addr = 0;
if (!dev)
return 0;
rcu_read_lock();
idev = __in_dev_get_rcu(dev);
if (!idev)
goto out;
ifa = idev->ifa_list;
if (!ifa)
goto out;
addr = ifa->ifa_local;
out:
rcu_read_unlock();
return addr;
}
static int bond_has_ip(struct bonding *bond)
{
struct vlan_entry *vlan, *vlan_next;
if (bond->master_ip)
return 1;
if (list_empty(&bond->vlan_list))
return 0;
list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
vlan_list) {
if (vlan->vlan_ip)
return 1;
}
return 0;
}
/*
* We go to the (large) trouble of VLAN tagging ARP frames because
* switches in VLAN mode (especially if ports are configured as
* "native" to a VLAN) might not pass non-tagged frames.
*/
static void bond_arp_send(struct net_device *slave_dev, int arp_op, u32 dest_ip, u32 src_ip, unsigned short vlan_id)
{
struct sk_buff *skb;
dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
slave_dev->name, dest_ip, src_ip, vlan_id);
skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
NULL, slave_dev->dev_addr, NULL);
if (!skb) {
printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
return;
}
if (vlan_id) {
skb = vlan_put_tag(skb, vlan_id);
if (!skb) {
printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
return;
}
}
arp_xmit(skb);
}
static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
{
int i, vlan_id, rv;
u32 *targets = bond->params.arp_targets;
struct vlan_entry *vlan, *vlan_next;
struct net_device *vlan_dev;
struct flowi fl;
struct rtable *rt;
for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
dprintk("basa: target %x\n", targets[i]);
if (list_empty(&bond->vlan_list)) {
dprintk("basa: empty vlan: arp_send\n");
bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
bond->master_ip, 0);
continue;
}
/*
* If VLANs are configured, we do a route lookup to
* determine which VLAN interface would be used, so we
* can tag the ARP with the proper VLAN tag.
*/
memset(&fl, 0, sizeof(fl));
fl.fl4_dst = targets[i];
fl.fl4_tos = RTO_ONLINK;
rv = ip_route_output_key(&rt, &fl);
if (rv) {
if (net_ratelimit()) {
printk(KERN_WARNING DRV_NAME
": %s: no route to arp_ip_target %u.%u.%u.%u\n",
bond->dev->name, NIPQUAD(fl.fl4_dst));
}
continue;
}
/*
* This target is not on a VLAN
*/
if (rt->u.dst.dev == bond->dev) {
ip_rt_put(rt);
dprintk("basa: rtdev == bond->dev: arp_send\n");
bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
bond->master_ip, 0);
continue;
}
vlan_id = 0;
list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
vlan_list) {
vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
if (vlan_dev == rt->u.dst.dev) {
vlan_id = vlan->vlan_id;
dprintk("basa: vlan match on %s %d\n",
vlan_dev->name, vlan_id);
break;
}
}
if (vlan_id) {
ip_rt_put(rt);
bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
vlan->vlan_ip, vlan_id);
continue;
}
if (net_ratelimit()) {
printk(KERN_WARNING DRV_NAME
": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
bond->dev->name, NIPQUAD(fl.fl4_dst),
rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
}
ip_rt_put(rt);
}
}
/*
* Kick out a gratuitous ARP for an IP on the bonding master plus one
* for each VLAN above us.
*/
static void bond_send_gratuitous_arp(struct bonding *bond)
{
struct slave *slave = bond->curr_active_slave;
struct vlan_entry *vlan;
struct net_device *vlan_dev;
dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
slave ? slave->dev->name : "NULL");
if (!slave)
return;
if (bond->master_ip) {
bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
bond->master_ip, 0);
}
list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
if (vlan->vlan_ip) {
bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
vlan->vlan_ip, vlan->vlan_id);
}
}
}
/*
* 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)) &&
bond_has_ip(bond))) {
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) &&
bond_has_ip(bond))) {
/* 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)) &&
bond_has_ip(bond))) &&
((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 && bond_has_ip(bond)) {
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->next) {
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;
struct bonding *bond = bond_dev->priv;
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;
case NETDEV_FEAT_CHANGE:
bond_compute_features(bond);
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;
}
/*
* bond_inetaddr_event: handle inetaddr notifier chain events.
*
* We keep track of device IPs primarily to use as source addresses in
* ARP monitor probes (rather than spewing out broadcasts all the time).
*
* We track one IP for the main device (if it has one), plus one per VLAN.
*/
static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
{
struct in_ifaddr *ifa = ptr;
struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
struct bonding *bond, *bond_next;
struct vlan_entry *vlan, *vlan_next;
list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
if (bond->dev == event_dev) {
switch (event) {
case NETDEV_UP:
bond->master_ip = ifa->ifa_local;
return NOTIFY_OK;
case NETDEV_DOWN:
bond->master_ip = bond_glean_dev_ip(bond->dev);
return NOTIFY_OK;
default:
return NOTIFY_DONE;
}
}
if (list_empty(&bond->vlan_list))
continue;
list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
vlan_list) {
vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
if (vlan_dev == event_dev) {
switch (event) {
case NETDEV_UP:
vlan->vlan_ip = ifa->ifa_local;
return NOTIFY_OK;
case NETDEV_DOWN:
vlan->vlan_ip =
bond_glean_dev_ip(vlan_dev);
return NOTIFY_OK;
default:
return NOTIFY_DONE;
}
}
}
}
return NOTIFY_DONE;
}
static struct notifier_block bond_netdev_notifier = {
.notifier_call = bond_netdev_event,
};
static struct notifier_block bond_inetaddr_notifier = {
.notifier_call = bond_inetaddr_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));
}
/*---------------------------- Hashing Policies -----------------------------*/
/*
* Hash for the the output device based upon layer 3 and layer 4 data. If
* the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
* altogether not IP, mimic bond_xmit_hash_policy_l2()
*/
static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
struct net_device *bond_dev, int count)
{
struct ethhdr *data = (struct ethhdr *)skb->data;
struct iphdr *iph = skb->nh.iph;
u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
int layer4_xor = 0;
if (skb->protocol == __constant_htons(ETH_P_IP)) {
if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
(iph->protocol == IPPROTO_TCP ||
iph->protocol == IPPROTO_UDP)) {
layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
}
return (layer4_xor ^
((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
}
return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
}
/*
* Hash for the output device based upon layer 2 data
*/
static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
struct net_device *bond_dev, int count)
{
struct ethhdr *data = (struct ethhdr *)skb->data;
return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
}
/*-------------------------- 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;
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 bond_xmit_xor() , we determine the output device by using a pre-
* determined xmit_hash_policy(), If the selected device is not enabled,
* find the next active slave.
*/
static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
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 = bond->xmit_hash_policy(skb, bond_dev, 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 bonding *bond, int mode)
{
struct net_device *bond_dev = bond->dev;
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;
if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
else
bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
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;
if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
else
bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
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;
}
}
static struct ethtool_ops bond_ethtool_ops = {
.get_tx_csum = ethtool_op_get_tx_csum,
.get_sg = ethtool_op_get_sg,
};
/*
* 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->ethtool_ops = &bond_ethtool_ops;
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, 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);
bond->bond_features = bond_dev->features;
#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 (xmit_hash_policy) {
if ((bond_mode != BOND_MODE_XOR) &&
(bond_mode != BOND_MODE_8023AD)) {
printk(KERN_INFO DRV_NAME
": xor_mode param is irrelevant in mode %s\n",
bond_mode_name(bond_mode));
} else {
xmit_hashtype = bond_parse_parm(xmit_hash_policy,
xmit_hashtype_tbl);
if (xmit_hashtype == -1) {
printk(KERN_ERR DRV_NAME
": Error: Invalid xmit_hash_policy \"%s\"\n",
xmit_hash_policy == NULL ? "NULL" :
xmit_hash_policy);
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->xmit_policy = xmit_hashtype;
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);
register_inetaddr_notifier(&bond_inetaddr_notifier);
return 0;
out_err:
/*
* rtnl_unlock() will run netdev_run_todo(), putting the
* thus-far-registered bonding devices into a state which
* unregigister_netdevice() will accept
*/
rtnl_unlock();
rtnl_lock();
/* 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);
unregister_inetaddr_notifier(&bond_inetaddr_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:
*/
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