/*
* originally based on the dummy device.
*
* Copyright 1999, Thomas Davis, tadavis@lbl.gov.
* Licensed under the GPL. Based on dummy.c, and eql.c devices.
*
* bonding.c: an Ethernet Bonding driver
*
* This is useful to talk to a Cisco EtherChannel compatible equipment:
* Cisco 5500
* Sun Trunking (Solaris)
* Alteon AceDirector Trunks
* Linux Bonding
* and probably many L2 switches ...
*
* How it works:
* ifconfig bond0 ipaddress netmask up
* will setup a network device, with an ip address. No mac address
* will be assigned at this time. The hw mac address will come from
* the first slave bonded to the channel. All slaves will then use
* this hw mac address.
*
* ifconfig bond0 down
* will release all slaves, marking them as down.
*
* ifenslave bond0 eth0
* will attach eth0 to bond0 as a slave. eth0 hw mac address will either
* a: be used as initial mac address
* b: if a hw mac address already is there, eth0's hw mac address
* will then be set from bond0.
*
* v0.1 - first working version.
* v0.2 - changed stats to be calculated by summing slaves stats.
*
* Changes:
* Arnaldo Carvalho de Melo <acme@conectiva.com.br>
* - fix leaks on failure at bond_init
*
* 2000/09/30 - Willy Tarreau <willy at meta-x.org>
* - added trivial code to release a slave device.
* - fixed security bug (CAP_NET_ADMIN not checked)
* - implemented MII link monitoring to disable dead links :
* All MII capable slaves are checked every <miimon> milliseconds
* (100 ms seems good). This value can be changed by passing it to
* insmod. A value of zero disables the monitoring (default).
* - fixed an infinite loop in bond_xmit_roundrobin() when there's no
* good slave.
* - made the code hopefully SMP safe
*
* 2000/10/03 - Willy Tarreau <willy at meta-x.org>
* - optimized slave lists based on relevant suggestions from Thomas Davis
* - implemented active-backup method to obtain HA with two switches:
* stay as long as possible on the same active interface, while we
* also monitor the backup one (MII link status) because we want to know
* if we are able to switch at any time. ( pass "mode=1" to insmod )
* - lots of stress testings because we need it to be more robust than the
* wires ! :->
*
* 2000/10/09 - Willy Tarreau <willy at meta-x.org>
* - added up and down delays after link state change.
* - optimized the slaves chaining so that when we run forward, we never
* repass through the bond itself, but we can find it by searching
* backwards. Renders the deletion more difficult, but accelerates the
* scan.
* - smarter enslaving and releasing.
* - finer and more robust SMP locking
*
* 2000/10/17 - Willy Tarreau <willy at meta-x.org>
* - fixed two potential SMP race conditions
*
* 2000/10/18 - Willy Tarreau <willy at meta-x.org>
* - small fixes to the monitoring FSM in case of zero delays
* 2000/11/01 - Willy Tarreau <willy at meta-x.org>
* - fixed first slave not automatically used in trunk mode.
* 2000/11/10 : spelling of "EtherChannel" corrected.
* 2000/11/13 : fixed a race condition in case of concurrent accesses to ioctl().
* 2000/12/16 : fixed improper usage of rtnl_exlock_nowait().
*
* 2001/1/3 - Chad N. Tindel <ctindel at ieee dot org>
* - The bonding driver now simulates MII status monitoring, just like
* a normal network device. It will show that the link is down iff
* every slave in the bond shows that their links are down. If at least
* one slave is up, the bond's MII status will appear as up.
*
* 2001/2/7 - Chad N. Tindel <ctindel at ieee dot org>
* - Applications can now query the bond from user space to get
* information which may be useful. They do this by calling
* the BOND_INFO_QUERY ioctl. Once the app knows how many slaves
* are in the bond, it can call the BOND_SLAVE_INFO_QUERY ioctl to
* get slave specific information (# link failures, etc). See
* <linux/if_bonding.h> for more details. The structs of interest
* are ifbond and ifslave.
*
* 2001/4/5 - Chad N. Tindel <ctindel at ieee dot org>
* - Ported to 2.4 Kernel
*
* 2001/5/2 - Jeffrey E. Mast <jeff at mastfamily dot com>
* - When a device is detached from a bond, the slave device is no longer
* left thinking that is has a master.
*
* 2001/5/16 - Jeffrey E. Mast <jeff at mastfamily dot com>
* - memset did not appropriately initialized the bond rw_locks. Used
* rwlock_init to initialize to unlocked state to prevent deadlock when
* first attempting a lock
* - Called SET_MODULE_OWNER for bond device
*
* 2001/5/17 - Tim Anderson <tsa at mvista.com>
* - 2 paths for releasing for slave release; 1 through ioctl
* and 2) through close. Both paths need to release the same way.
* - the free slave in bond release is changing slave status before
* the free. The netdev_set_master() is intended to change slave state
* so it should not be done as part of the release process.
* - Simple rule for slave state at release: only the active in A/B and
* only one in the trunked case.
*
* 2001/6/01 - Tim Anderson <tsa at mvista.com>
* - Now call dev_close when releasing a slave so it doesn't screw up
* out routing table.
*
* 2001/6/01 - Chad N. Tindel <ctindel at ieee dot org>
* - Added /proc support for getting bond and slave information.
* Information is in /proc/net/<bond device>/info.
* - Changed the locking when calling bond_close to prevent deadlock.
*
* 2001/8/05 - Janice Girouard <girouard at us.ibm.com>
* - correct problem where refcnt of slave is not incremented in bond_ioctl
* so the system hangs when halting.
* - correct locking problem when unable to malloc in bond_enslave.
* - adding bond_xmit_xor logic.
* - adding multiple bond device support.
*
* 2001/8/13 - Erik Habbinga <erik_habbinga at hp dot com>
* - correct locking problem with rtnl_exlock_nowait
*
* 2001/8/23 - Janice Girouard <girouard at us.ibm.com>
* - bzero initial dev_bonds, to correct oops
* - convert SIOCDEVPRIVATE to new MII ioctl calls
*
* 2001/9/13 - Takao Indoh <indou dot takao at jp dot fujitsu dot com>
* - Add the BOND_CHANGE_ACTIVE ioctl implementation
*
* 2001/9/14 - Mark Huth <mhuth at mvista dot com>
* - Change MII_LINK_READY to not check for end of auto-negotiation,
* but only for an up link.
*
* 2001/9/20 - Chad N. Tindel <ctindel at ieee dot org>
* - Add the device field to bonding_t. Previously the net_device
* corresponding to a bond wasn't available from the bonding_t
* structure.
*
* 2001/9/25 - Janice Girouard <girouard at us.ibm.com>
* - add arp_monitor for active backup mode
*
* 2001/10/23 - Takao Indoh <indou dot takao at jp dot fujitsu dot com>
* - Various memory leak fixes
*
* 2001/11/5 - Mark Huth <mark dot huth at mvista dot com>
* - Don't take rtnl lock in bond_mii_monitor as it deadlocks under
* certain hotswap conditions.
* Note: this same change may be required in bond_arp_monitor ???
* - Remove possibility of calling bond_sethwaddr with NULL slave_dev ptr
* - Handle hot swap ethernet interface deregistration events to remove
* kernel oops following hot swap of enslaved interface
*
* 2002/1/2 - Chad N. Tindel <ctindel at ieee dot org>
* - Restore original slave flags at release time.
*
* 2002/02/18 - Erik Habbinga <erik_habbinga at hp dot com>
* - bond_release(): calling kfree on our_slave after call to
* bond_restore_slave_flags, not before
* - bond_enslave(): saving slave flags into original_flags before
* call to netdev_set_master, so the IFF_SLAVE flag doesn't end
* up in original_flags
*
* 2002/04/05 - Mark Smith <mark.smith at comdev dot cc> and
* Steve Mead <steve.mead at comdev dot cc>
* - Port Gleb Natapov's multicast support patchs from 2.4.12
* to 2.4.18 adding support for multicast.
*
* 2002/06/10 - Tony Cureington <tony.cureington * hp_com>
* - corrected uninitialized pointer (ifr.ifr_data) in bond_check_dev_link;
* actually changed function to use MIIPHY, then MIIREG, and finally
* ETHTOOL to determine the link status
* - fixed bad ifr_data pointer assignments in bond_ioctl
* - corrected mode 1 being reported as active-backup in bond_get_info;
* also added text to distinguish type of load balancing (rr or xor)
* - change arp_ip_target module param from "1-12s" (array of 12 ptrs)
* to "s" (a single ptr)
*
* 2002/08/30 - Jay Vosburgh <fubar at us dot ibm dot com>
* - Removed acquisition of xmit_lock in set_multicast_list; caused
* deadlock on SMP (lock is held by caller).
* - Revamped SIOCGMIIPHY, SIOCGMIIREG portion of bond_check_dev_link().
*
* 2002/09/18 - Jay Vosburgh <fubar at us dot ibm dot com>
* - Fixed up bond_check_dev_link() (and callers): removed some magic
* numbers, banished local MII_ defines, wrapped ioctl calls to
* prevent EFAULT errors
*
* 2002/9/30 - Jay Vosburgh <fubar at us dot ibm dot com>
* - make sure the ip target matches the arp_target before saving the
* hw address.
*
* 2002/9/30 - Dan Eisner <eisner at 2robots dot com>
* - make sure my_ip is set before taking down the link, since
* not all switches respond if the source ip is not set.
*
* 2002/10/8 - Janice Girouard <girouard at us dot ibm dot com>
* - read in the local ip address when enslaving a device
* - add primary support
* - make sure 2*arp_interval has passed when a new device
* is brought on-line before taking it down.
*
* 2002/09/11 - Philippe De Muyter <phdm at macqel dot be>
* - Added bond_xmit_broadcast logic.
* - Added bond_mode() support function.
*
* 2002/10/26 - Laurent Deniel <laurent.deniel at free.fr>
* - allow to register multicast addresses only on active slave
* (useful in active-backup mode)
* - add multicast module parameter
* - fix deletion of multicast groups after unloading module
*
* 2002/11/06 - Kameshwara Rayaprolu <kameshwara.rao * wipro_com>
* - Changes to prevent panic from closing the device twice; if we close
* the device in bond_release, we must set the original_flags to down
* so it won't be closed again by the network layer.
*
* 2002/11/07 - Tony Cureington <tony.cureington * hp_com>
* - Fix arp_target_hw_addr memory leak
* - Created activebackup_arp_monitor function to handle arp monitoring
* in active backup mode - the bond_arp_monitor had several problems...
* such as allowing slaves to tx arps sequentially without any delay
* for a response
* - Renamed bond_arp_monitor to loadbalance_arp_monitor and re-wrote
* this function to just handle arp monitoring in load-balancing mode;
* it is a lot more compact now
* - Changes to ensure one and only one slave transmits in active-backup
* mode
* - Robustesize parameters; warn users about bad combinations of
* parameters; also if miimon is specified and a network driver does
* not support MII or ETHTOOL, inform the user of this
* - Changes to support link_failure_count when in arp monitoring mode
* - Fix up/down delay reported in /proc
* - Added version; log version; make version available from "modinfo -d"
* - Fixed problem in bond_check_dev_link - if the first IOCTL (SIOCGMIIPH)
* failed, the ETHTOOL ioctl never got a chance
*
* 2002/11/16 - Laurent Deniel <laurent.deniel at free.fr>
* - fix multicast handling in activebackup_arp_monitor
* - remove one unnecessary and confusing curr_active_slave == slave test
* in activebackup_arp_monitor
*
* 2002/11/17 - Laurent Deniel <laurent.deniel at free.fr>
* - fix bond_slave_info_query when slave_id = num_slaves
*
* 2002/11/19 - Janice Girouard <girouard at us dot ibm dot com>
* - correct ifr_data reference. Update ifr_data reference
* to mii_ioctl_data struct values to avoid confusion.
*
* 2002/11/22 - Bert Barbe <bert.barbe at oracle dot com>
* - Add support for multiple arp_ip_target
*
* 2002/12/13 - Jay Vosburgh <fubar at us dot ibm dot com>
* - Changed to allow text strings for mode and multicast, e.g.,
* insmod bonding mode=active-backup. The numbers still work.
* One change: an invalid choice will cause module load failure,
* rather than the previous behavior of just picking one.
* - Minor cleanups; got rid of dup ctype stuff, atoi function
*
* 2003/02/07 - Jay Vosburgh <fubar at us dot ibm dot com>
* - Added use_carrier module parameter that causes miimon to
* use netif_carrier_ok() test instead of MII/ETHTOOL ioctls.
* - Minor cleanups; consolidated ioctl calls to one function.
*
* 2003/02/07 - Tony Cureington <tony.cureington * hp_com>
* - Fix bond_mii_monitor() logic error that could result in
* bonding round-robin mode ignoring links after failover/recovery
*
* 2003/03/17 - Jay Vosburgh <fubar at us dot ibm dot com>
* - kmalloc fix (GFP_KERNEL to GFP_ATOMIC) reported by
* Shmulik dot Hen at intel.com.
* - Based on discussion on mailing list, changed use of
* update_slave_cnt(), created wrapper functions for adding/removing
* slaves, changed bond_xmit_xor() to check slave_cnt instead of
* checking slave and slave->dev (which only worked by accident).
* - Misc code cleanup: get arp_send() prototype from header file,
* add max_bonds to bonding.txt.
*
* 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and
* Shmulik Hen <shmulik.hen at intel dot com>
* - Make sure only bond_attach_slave() and bond_detach_slave() can
* manipulate the slave list, including slave_cnt, even when in
* bond_release_all().
* - Fixed hang in bond_release() with traffic running:
* netdev_set_master() must not be called from within the bond lock.
*
* 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and
* Shmulik Hen <shmulik.hen at intel dot com>
* - Fixed hang in bond_enslave() with traffic running:
* netdev_set_master() must not be called from within the bond lock.
*
* 2003/03/18 - Amir Noam <amir.noam at intel dot com>
* - Added support for getting slave's speed and duplex via ethtool.
* Needed for 802.3ad and other future modes.
*
* 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and
* Shmulik Hen <shmulik.hen at intel dot com>
* - Enable support of modes that need to use the unique mac address of
* each slave.
* * bond_enslave(): Moved setting the slave's mac address, and
* openning it, from the application to the driver. This breaks
* backward comaptibility with old versions of ifenslave that open
* the slave before enalsving it !!!.
* * bond_release(): The driver also takes care of closing the slave
* and restoring its original mac address.
* - Removed the code that restores all base driver's flags.
* Flags are automatically restored once all undo stages are done
* properly.
* - Block possibility of enslaving before the master is up. This
* prevents putting the system in an unstable state.
*
* 2003/03/18 - Amir Noam <amir.noam at intel dot com>,
* Tsippy Mendelson <tsippy.mendelson at intel dot com> and
* Shmulik Hen <shmulik.hen at intel dot com>
* - Added support for IEEE 802.3ad Dynamic link aggregation mode.
*
* 2003/05/01 - Amir Noam <amir.noam at intel dot com>
* - Added ABI version control to restore compatibility between
* new/old ifenslave and new/old bonding.
*
* 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com>
* - Fixed bug in bond_release_all(): save old value of curr_active_slave
* before setting it to NULL.
* - Changed driver versioning scheme to include version number instead
* of release date (that is already in another field). There are 3
* fields X.Y.Z where:
* X - Major version - big behavior changes
* Y - Minor version - addition of features
* Z - Extra version - minor changes and bug fixes
* The current version is 1.0.0 as a base line.
*
* 2003/05/01 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and
* Amir Noam <amir.noam at intel dot com>
* - Added support for lacp_rate module param.
* - Code beautification and style changes (mainly in comments).
* new version - 1.0.1
*
* 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com>
* - Based on discussion on mailing list, changed locking scheme
* to use lock/unlock or lock_bh/unlock_bh appropriately instead
* of lock_irqsave/unlock_irqrestore. The new scheme helps exposing
* hidden bugs and solves system hangs that occurred due to the fact
* that holding lock_irqsave doesn't prevent softirqs from running.
* This also increases total throughput since interrupts are not
* blocked on each transmitted packets or monitor timeout.
* new version - 2.0.0
*
* 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com>
* - Added support for Transmit load balancing mode.
* - Concentrate all assignments of curr_active_slave to a single point
* so specific modes can take actions when the primary adapter is
* changed.
* - Take the updelay parameter into consideration during bond_enslave
* since some adapters loose their link during setting the device.
* - Renamed bond_3ad_link_status_changed() to
* bond_3ad_handle_link_change() for compatibility with TLB.
* new version - 2.1.0
*
* 2003/05/01 - Tsippy Mendelson <tsippy.mendelson at intel dot com>
* - Added support for Adaptive load balancing mode which is
* equivalent to Transmit load balancing + Receive load balancing.
* new version - 2.2.0
*
* 2003/05/15 - Jay Vosburgh <fubar at us dot ibm dot com>
* - Applied fix to activebackup_arp_monitor posted to bonding-devel
* by Tony Cureington <tony.cureington * hp_com>. Fixes ARP
* monitor endless failover bug. Version to 2.2.10
*
* 2003/05/20 - Amir Noam <amir.noam at intel dot com>
* - Fixed bug in ABI version control - Don't commit to a specific
* ABI version if receiving unsupported ioctl commands.
*
* 2003/05/22 - Jay Vosburgh <fubar at us dot ibm dot com>
* - Fix ifenslave -c causing bond to loose existing routes;
* added bond_set_mac_address() that doesn't require the
* bond to be down.
* - In conjunction with fix for ifenslave -c, in
* bond_change_active(), changing to the already active slave
* is no longer an error (it successfully does nothing).
*
* 2003/06/30 - Amir Noam <amir.noam at intel dot com>
* - Fixed bond_change_active() for ALB/TLB modes.
* Version to 2.2.14.
*
* 2003/07/29 - Amir Noam <amir.noam at intel dot com>
* - Fixed ARP monitoring bug.
* Version to 2.2.15.
*
* 2003/07/31 - Willy Tarreau <willy at ods dot org>
* - Fixed kernel panic when using ARP monitoring without
* setting bond's IP address.
* Version to 2.2.16.
*
* 2003/08/06 - Amir Noam <amir.noam at intel dot com>
* - Back port from 2.6: use alloc_netdev(); fix /proc handling;
* made stats a part of bond struct so no need to allocate
* and free it separately; use standard list operations instead
* of pre-allocated array of bonds.
* Version to 2.3.0.
*
* 2003/08/07 - Jay Vosburgh <fubar at us dot ibm dot com>,
* Amir Noam <amir.noam at intel dot com> and
* Shmulik Hen <shmulik.hen at intel dot com>
* - Propagating master's settings: Distinguish between modes that
* use a primary slave from those that don't, and propagate settings
* accordingly; Consolidate change_active opeartions and add
* reselect_active and find_best opeartions; Decouple promiscuous
* handling from the multicast mode setting; Add support for changing
* HW address and MTU with proper unwind; Consolidate procfs code,
* add CHANGENAME handler; Enhance netdev notification handling.
* Version to 2.4.0.
*
* 2003/09/15 - Stephen Hemminger <shemminger at osdl dot org>,
* Amir Noam <amir.noam at intel dot com>
* - Convert /proc to seq_file interface.
* Change /proc/net/bondX/info to /proc/net/bonding/bondX.
* Set version to 2.4.1.
*
* 2003/11/20 - Amir Noam <amir.noam at intel dot com>
* - Fix /proc creation/destruction.
*
* 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com>
* - Massive cleanup - Set version to 2.5.0
* Code changes:
* o Consolidate format of prints and debug prints.
* o Remove bonding_t/slave_t typedefs and consolidate all casts.
* o Remove dead code and unnecessary checks.
* o Consolidate starting/stopping timers.
* o Consolidate handling of primary module param throughout the code.
* o Removed multicast module param support - all settings are done
* according to mode.
* o Slave list iteration - bond is no longer part of the list,
* added cyclic list iteration macros.
* o Consolidate error handling in all xmit functions.
* Style changes:
* o Consolidate function naming and declarations.
* o Consolidate function params and local variables names.
* o Consolidate return values.
* o Consolidate curly braces.
* o Consolidate conditionals format.
* o Change struct member names and types.
* o Chomp trailing spaces, remove empty lines, fix indentations.
* o Re-organize code according to context.
*
* 2003/12/30 - Amir Noam <amir.noam at intel dot com>
* - Fixed: Cannot remove and re-enslave the original active slave.
* - Fixed: Releasing the original active slave causes mac address
* duplication.
* - Add support for slaves that use ethtool_ops.
* Set version to 2.5.3.
*
* 2004/01/05 - Amir Noam <amir.noam at intel dot com>
* - Save bonding parameters per bond instead of using the global values.
* Set version to 2.5.4.
*
* 2004/01/14 - Shmulik Hen <shmulik.hen at intel dot com>
* - Enhance VLAN support:
* * Add support for VLAN hardware acceleration capable slaves.
* * Add capability to tag self generated packets in ALB/TLB modes.
* Set version to 2.6.0.
* 2004/10/29 - Mitch Williams <mitch.a.williams at intel dot com>
* - Fixed bug when unloading module while using 802.3ad. If
* spinlock debugging is turned on, this causes a stack dump.
* Solution is to move call to dev_remove_pack outside of the
* spinlock.
* Set version to 2.6.1.
*
*/
//#define BONDING_DEBUG 1
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/socket.h>
#include <linux/ctype.h>
#include <linux/inet.h>
#include <linux/bitops.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/rtnetlink.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/smp.h>
#include <linux/if_ether.h>
#include <net/arp.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/if_bonding.h>
#include "bonding.h"
#include "bond_3ad.h"
#include "bond_alb.h"
/*---------------------------- Module parameters ----------------------------*/
/* monitor all links that often (in milliseconds). <=0 disables monitoring */
#define BOND_LINK_MON_INTERV 0
#define BOND_LINK_ARP_INTERV 0
static int max_bonds = BOND_DEFAULT_MAX_BONDS;
static int miimon = BOND_LINK_MON_INTERV;
static int updelay = 0;
static int downdelay = 0;
static int use_carrier = 1;
static char *mode = NULL;
static char *primary = NULL;
static char *lacp_rate = NULL;
static int arp_interval = BOND_LINK_ARP_INTERV;
static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
module_param(max_bonds, int, 0);
MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
module_param(miimon, int, 0);
MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
module_param(updelay, int, 0);
MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
module_param(downdelay, int, 0);
MODULE_PARM_DESC(downdelay, "Delay before considering link down, in milliseconds");
module_param(use_carrier, int, 0);
MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; 0 for off, 1 for on (default)");
module_param(mode, charp, 0);
MODULE_PARM_DESC(mode, "Mode of operation : 0 for round robin, 1 for active-backup, 2 for xor");
module_param(primary, charp, 0);
MODULE_PARM_DESC(primary, "Primary network device to use");
module_param(lacp_rate, charp, 0);
MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner (slow/fast)");
module_param(arp_interval, int, 0);
MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
module_param_array(arp_ip_target, charp, NULL, 0);
MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
/*----------------------------- Global variables ----------------------------*/
static const char *version =
DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
static LIST_HEAD(bond_dev_list);
#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *bond_proc_dir = NULL;
#endif
static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
static int arp_ip_count = 0;
static u32 my_ip = 0;
static int bond_mode = BOND_MODE_ROUNDROBIN;
static int lacp_fast = 0;
static int app_abi_ver = 0;
static int orig_app_abi_ver = -1; /* This is used to save the first ABI version
* we receive from the application. Once set,
* it won't be changed, and the module will
* refuse to enslave/release interfaces if the
* command comes from an application using
* another ABI version.
*/
struct bond_parm_tbl {
char *modename;
int mode;
};
static struct bond_parm_tbl bond_lacp_tbl[] = {
{ "slow", AD_LACP_SLOW},
{ "fast", AD_LACP_FAST},
{ NULL, -1},
};
static struct bond_parm_tbl bond_mode_tbl[] = {
{ "balance-rr", BOND_MODE_ROUNDROBIN},
{ "active-backup", BOND_MODE_ACTIVEBACKUP},
{ "balance-xor", BOND_MODE_XOR},
{ "broadcast", BOND_MODE_BROADCAST},
{ "802.3ad", BOND_MODE_8023AD},
{ "balance-tlb", BOND_MODE_TLB},
{ "balance-alb", BOND_MODE_ALB},
{ NULL, -1},
};
/*-------------------------- Forward declarations ---------------------------*/
static inline void bond_set_mode_ops(struct net_device *bond_dev, int mode);
/*---------------------------- General routines -----------------------------*/
static const char *bond_mode_name(int mode)
{
switch (mode) {
case BOND_MODE_ROUNDROBIN :
return "load balancing (round-robin)";
case BOND_MODE_ACTIVEBACKUP :
return "fault-tolerance (active-backup)";
case BOND_MODE_XOR :
return "load balancing (xor)";
case BOND_MODE_BROADCAST :
return "fault-tolerance (broadcast)";
case BOND_MODE_8023AD:
return "IEEE 802.3ad Dynamic link aggregation";
case BOND_MODE_TLB:
return "transmit load balancing";
case BOND_MODE_ALB:
return "adaptive load balancing";
default:
return "unknown";
}
}
/*---------------------------------- VLAN -----------------------------------*/
/**
* bond_add_vlan - add a new vlan id on bond
* @bond: bond that got the notification
* @vlan_id: the vlan id to add
*
* Returns -ENOMEM if allocation failed.
*/
static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
{
struct vlan_entry *vlan;
dprintk("bond: %s, vlan id %d\n",
(bond ? bond->dev->name: "None"), vlan_id);
vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
if (!vlan) {
return -ENOMEM;
}
INIT_LIST_HEAD(&vlan->vlan_list);
vlan->vlan_id = vlan_id;
write_lock_bh(&bond->lock);
list_add_tail(&vlan->vlan_list, &bond->vlan_list);
write_unlock_bh(&bond->lock);
dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
return 0;
}
/**
* bond_del_vlan - delete a vlan id from bond
* @bond: bond that got the notification
* @vlan_id: the vlan id to delete
*
* returns -ENODEV if @vlan_id was not found in @bond.
*/
static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
{
struct vlan_entry *vlan, *next;
int res = -ENODEV;
dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
write_lock_bh(&bond->lock);
list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) {
if (vlan->vlan_id == vlan_id) {
list_del(&vlan->vlan_list);
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
bond_alb_clear_vlan(bond, vlan_id);
}
dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
bond->dev->name);
kfree(vlan);
if (list_empty(&bond->vlan_list) &&
(bond->slave_cnt == 0)) {
/* Last VLAN removed and no slaves, so
* restore block on adding VLANs. This will
* be removed once new slaves that are not
* VLAN challenged will be added.
*/
bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
}
res = 0;
goto out;
}
}
dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
bond->dev->name);
out:
write_unlock_bh(&bond->lock);
return res;
}
/**
* bond_has_challenged_slaves
* @bond: the bond we're working on
*
* Searches the slave list. Returns 1 if a vlan challenged slave
* was found, 0 otherwise.
*
* Assumes bond->lock is held.
*/
static int bond_has_challenged_slaves(struct bonding *bond)
{
struct slave *slave;
int i;
bond_for_each_slave(bond, slave, i) {
if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
dprintk("found VLAN challenged slave - %s\n",
slave->dev->name);
return 1;
}
}
dprintk("no VLAN challenged slaves found\n");
return 0;
}
/**
* bond_next_vlan - safely skip to the next item in the vlans list.
* @bond: the bond we're working on
* @curr: item we're advancing from
*
* Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
* or @curr->next otherwise (even if it is @curr itself again).
*
* Caller must hold bond->lock
*/
struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
{
struct vlan_entry *next, *last;
if (list_empty(&bond->vlan_list)) {
return NULL;
}
if (!curr) {
next = list_entry(bond->vlan_list.next,
struct vlan_entry, vlan_list);
} else {
last = list_entry(bond->vlan_list.prev,
struct vlan_entry, vlan_list);
if (last == curr) {
next = list_entry(bond->vlan_list.next,
struct vlan_entry, vlan_list);
} else {
next = list_entry(curr->vlan_list.next,
struct vlan_entry, vlan_list);
}
}
return next;
}
/**
* bond_dev_queue_xmit - Prepare skb for xmit.
*
* @bond: bond device that got this skb for tx.
* @skb: hw accel VLAN tagged skb to transmit
* @slave_dev: slave that is supposed to xmit this skbuff
*
* When the bond gets an skb to transmit that is
* already hardware accelerated VLAN tagged, and it
* needs to relay this skb to a slave that is not
* hw accel capable, the skb needs to be "unaccelerated",
* i.e. strip the hwaccel tag and re-insert it as part
* of the payload.
*/
int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
{
unsigned short vlan_id;
if (!list_empty(&bond->vlan_list) &&
!(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
vlan_get_tag(skb, &vlan_id) == 0) {
skb->dev = slave_dev;
skb = vlan_put_tag(skb, vlan_id);
if (!skb) {
/* vlan_put_tag() frees the skb in case of error,
* so return success here so the calling functions
* won't attempt to free is again.
*/
return 0;
}
} else {
skb->dev = slave_dev;
}
skb->priority = 1;
dev_queue_xmit(skb);
return 0;
}
/*
* In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
* and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
* lock because:
* a. This operation is performed in IOCTL context,
* b. The operation is protected by the RTNL semaphore in the 8021q code,
* c. Holding a lock with BH disabled while directly calling a base driver
* entry point is generally a BAD idea.
*
* The design of synchronization/protection for this operation in the 8021q
* module is good for one or more VLAN devices over a single physical device
* and cannot be extended for a teaming solution like bonding, so there is a
* potential race condition here where a net device from the vlan group might
* be referenced (either by a base driver or the 8021q code) while it is being
* removed from the system. However, it turns out we're not making matters
* worse, and if it works for regular VLAN usage it will work here too.
*/
/**
* bond_vlan_rx_register - Propagates registration to slaves
* @bond_dev: bonding net device that got called
* @grp: vlan group being registered
*/
static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave;
int i;
bond->vlgrp = grp;
bond_for_each_slave(bond, slave, i) {
struct net_device *slave_dev = slave->dev;
if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
slave_dev->vlan_rx_register) {
slave_dev->vlan_rx_register(slave_dev, grp);
}
}
}
/**
* bond_vlan_rx_add_vid - Propagates adding an id to slaves
* @bond_dev: bonding net device that got called
* @vid: vlan id being added
*/
static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave;
int i, res;
bond_for_each_slave(bond, slave, i) {
struct net_device *slave_dev = slave->dev;
if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
slave_dev->vlan_rx_add_vid) {
slave_dev->vlan_rx_add_vid(slave_dev, vid);
}
}
res = bond_add_vlan(bond, vid);
if (res) {
printk(KERN_ERR DRV_NAME
": %s: Failed to add vlan id %d\n",
bond_dev->name, vid);
}
}
/**
* bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
* @bond_dev: bonding net device that got called
* @vid: vlan id being removed
*/
static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave;
struct net_device *vlan_dev;
int i, res;
bond_for_each_slave(bond, slave, i) {
struct net_device *slave_dev = slave->dev;
if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
slave_dev->vlan_rx_kill_vid) {
/* Save and then restore vlan_dev in the grp array,
* since the slave's driver might clear it.
*/
vlan_dev = bond->vlgrp->vlan_devices[vid];
slave_dev->vlan_rx_kill_vid(slave_dev, vid);
bond->vlgrp->vlan_devices[vid] = vlan_dev;
}
}
res = bond_del_vlan(bond, vid);
if (res) {
printk(KERN_ERR DRV_NAME
": %s: Failed to remove vlan id %d\n",
bond_dev->name, vid);
}
}
static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
{
struct vlan_entry *vlan;
write_lock_bh(&bond->lock);
if (list_empty(&bond->vlan_list)) {
goto out;
}
if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
slave_dev->vlan_rx_register) {
slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
}
if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
!(slave_dev->vlan_rx_add_vid)) {
goto out;
}
list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
}
out:
write_unlock_bh(&bond->lock);
}
static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
{
struct vlan_entry *vlan;
struct net_device *vlan_dev;
write_lock_bh(&bond->lock);
if (list_empty(&bond->vlan_list)) {
goto out;
}
if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
!(slave_dev->vlan_rx_kill_vid)) {
goto unreg;
}
list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
/* Save and then restore vlan_dev in the grp array,
* since the slave's driver might clear it.
*/
vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
bond->vlgrp->vlan_devices[vlan->vlan_id] = vlan_dev;
}
unreg:
if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
slave_dev->vlan_rx_register) {
slave_dev->vlan_rx_register(slave_dev, NULL);
}
out:
write_unlock_bh(&bond->lock);
}
/*------------------------------- Link status -------------------------------*/
/*
* Get link speed and duplex from the slave's base driver
* using ethtool. If for some reason the call fails or the
* values are invalid, fake speed and duplex to 100/Full
* and return error.
*/
static int bond_update_speed_duplex(struct slave *slave)
{
struct net_device *slave_dev = slave->dev;
static int (* ioctl)(struct net_device *, struct ifreq *, int);
struct ifreq ifr;
struct ethtool_cmd etool;
/* Fake speed and duplex */
slave->speed = SPEED_100;
slave->duplex = DUPLEX_FULL;
if (slave_dev->ethtool_ops) {
u32 res;
if (!slave_dev->ethtool_ops->get_settings) {
return -1;
}
res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
if (res < 0) {
return -1;
}
goto verify;
}
ioctl = slave_dev->do_ioctl;
strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
etool.cmd = ETHTOOL_GSET;
ifr.ifr_data = (char*)&etool;
if (!ioctl || (IOCTL(slave_dev, &ifr, SIOCETHTOOL) < 0)) {
return -1;
}
verify:
switch (etool.speed) {
case SPEED_10:
case SPEED_100:
case SPEED_1000:
break;
default:
return -1;
}
switch (etool.duplex) {
case DUPLEX_FULL:
case DUPLEX_HALF:
break;
default:
return -1;
}
slave->speed = etool.speed;
slave->duplex = etool.duplex;
return 0;
}
/*
* if <dev> supports MII link status reporting, check its link status.
*
* We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
* depening upon the setting of the use_carrier parameter.
*
* Return either BMSR_LSTATUS, meaning that the link is up (or we
* can't tell and just pretend it is), or 0, meaning that the link is
* down.
*
* If reporting is non-zero, instead of faking link up, return -1 if
* both ETHTOOL and MII ioctls fail (meaning the device does not
* support them). If use_carrier is set, return whatever it says.
* It'd be nice if there was a good way to tell if a driver supports
* netif_carrier, but there really isn't.
*/
static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
{
static int (* ioctl)(struct net_device *, struct ifreq *, int);
struct ifreq ifr;
struct mii_ioctl_data *mii;
struct ethtool_value etool;
if (bond->params.use_carrier) {
return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
}
ioctl = slave_dev->do_ioctl;
if (ioctl) {
/* TODO: set pointer to correct ioctl on a per team member */
/* bases to make this more efficient. that is, once */
/* we determine the correct ioctl, we will always */
/* call it and not the others for that team */
/* member. */
/*
* We cannot assume that SIOCGMIIPHY will also read a
* register; not all network drivers (e.g., e100)
* support that.
*/
/* Yes, the mii is overlaid on the ifreq.ifr_ifru */
strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
mii = if_mii(&ifr);
if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
mii->reg_num = MII_BMSR;
if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
return (mii->val_out & BMSR_LSTATUS);
}
}
}
/* try SIOCETHTOOL ioctl, some drivers cache ETHTOOL_GLINK */
/* for a period of time so we attempt to get link status */
/* from it last if the above MII ioctls fail... */
if (slave_dev->ethtool_ops) {
if (slave_dev->ethtool_ops->get_link) {
u32 link;
link = slave_dev->ethtool_ops->get_link(slave_dev);
return link ? BMSR_LSTATUS : 0;
}
}
if (ioctl) {
strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
etool.cmd = ETHTOOL_GLINK;
ifr.ifr_data = (char*)&etool;
if (IOCTL(slave_dev, &ifr, SIOCETHTOOL) == 0) {
if (etool.data == 1) {
return BMSR_LSTATUS;
} else {
dprintk("SIOCETHTOOL shows link down\n");
return 0;
}
}
}
/*
* If reporting, report that either there's no dev->do_ioctl,
* or both SIOCGMIIREG and SIOCETHTOOL failed (meaning that we
* cannot report link status). If not reporting, pretend
* we're ok.
*/
return (reporting ? -1 : BMSR_LSTATUS);
}
/*----------------------------- Multicast list ------------------------------*/
/*
* Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
*/
static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
{
return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
dmi1->dmi_addrlen == dmi2->dmi_addrlen;
}
/*
* returns dmi entry if found, NULL otherwise
*/
static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
{
struct dev_mc_list *idmi;
for (idmi = mc_list; idmi; idmi = idmi->next) {
if (bond_is_dmi_same(dmi, idmi)) {
return idmi;
}
}
return NULL;
}
/*
* Push the promiscuity flag down to appropriate slaves
*/
static void bond_set_promiscuity(struct bonding *bond, int inc)
{
if (USES_PRIMARY(bond->params.mode)) {
/* write lock already acquired */
if (bond->curr_active_slave) {
dev_set_promiscuity(bond->curr_active_slave->dev, inc);
}
} else {
struct slave *slave;
int i;
bond_for_each_slave(bond, slave, i) {
dev_set_promiscuity(slave->dev, inc);
}
}
}
/*
* Push the allmulti flag down to all slaves
*/
static void bond_set_allmulti(struct bonding *bond, int inc)
{
if (USES_PRIMARY(bond->params.mode)) {
/* write lock already acquired */
if (bond->curr_active_slave) {
dev_set_allmulti(bond->curr_active_slave->dev, inc);
}
} else {
struct slave *slave;
int i;
bond_for_each_slave(bond, slave, i) {
dev_set_allmulti(slave->dev, inc);
}
}
}
/*
* Add a Multicast address to slaves
* according to mode
*/
static void bond_mc_add(struct bonding *bond, void *addr, int alen)
{
if (USES_PRIMARY(bond->params.mode)) {
/* write lock already acquired */
if (bond->curr_active_slave) {
dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
}
} else {
struct slave *slave;
int i;
bond_for_each_slave(bond, slave, i) {
dev_mc_add(slave->dev, addr, alen, 0);
}
}
}
/*
* Remove a multicast address from slave
* according to mode
*/
static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
{
if (USES_PRIMARY(bond->params.mode)) {
/* write lock already acquired */
if (bond->curr_active_slave) {
dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
}
} else {
struct slave *slave;
int i;
bond_for_each_slave(bond, slave, i) {
dev_mc_delete(slave->dev, addr, alen, 0);
}
}
}
/*
* Totally destroys the mc_list in bond
*/
static void bond_mc_list_destroy(struct bonding *bond)
{
struct dev_mc_list *dmi;
dmi = bond->mc_list;
while (dmi) {
bond->mc_list = dmi->next;
kfree(dmi);
dmi = bond->mc_list;
}
}
/*
* Copy all the Multicast addresses from src to the bonding device dst
*/
static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond, int gpf_flag)
{
struct dev_mc_list *dmi, *new_dmi;
for (dmi = mc_list; dmi; dmi = dmi->next) {
new_dmi = kmalloc(sizeof(struct dev_mc_list), gpf_flag);
if (!new_dmi) {
/* FIXME: Potential memory leak !!! */
return -ENOMEM;
}
new_dmi->next = bond->mc_list;
bond->mc_list = new_dmi;
new_dmi->dmi_addrlen = dmi->dmi_addrlen;
memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
new_dmi->dmi_users = dmi->dmi_users;
new_dmi->dmi_gusers = dmi->dmi_gusers;
}
return 0;
}
/*
* flush all members of flush->mc_list from device dev->mc_list
*/
static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
{
struct bonding *bond = bond_dev->priv;
struct dev_mc_list *dmi;
for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
}
if (bond->params.mode == BOND_MODE_8023AD) {
/* del lacpdu mc addr from mc list */
u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
}
}
/*--------------------------- Active slave change ---------------------------*/
/*
* Update the mc list and multicast-related flags for the new and
* old active slaves (if any) according to the multicast mode, and
* promiscuous flags unconditionally.
*/
static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
{
struct dev_mc_list *dmi;
if (!USES_PRIMARY(bond->params.mode)) {
/* nothing to do - mc list is already up-to-date on
* all slaves
*/
return;
}
if (old_active) {
if (bond->dev->flags & IFF_PROMISC) {
dev_set_promiscuity(old_active->dev, -1);
}
if (bond->dev->flags & IFF_ALLMULTI) {
dev_set_allmulti(old_active->dev, -1);
}
for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
}
}
if (new_active) {
if (bond->dev->flags & IFF_PROMISC) {
dev_set_promiscuity(new_active->dev, 1);
}
if (bond->dev->flags & IFF_ALLMULTI) {
dev_set_allmulti(new_active->dev, 1);
}
for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
}
}
}
/**
* find_best_interface - select the best available slave to be the active one
* @bond: our bonding struct
*
* Warning: Caller must hold curr_slave_lock for writing.
*/
static struct slave *bond_find_best_slave(struct bonding *bond)
{
struct slave *new_active, *old_active;
struct slave *bestslave = NULL;
int mintime = bond->params.updelay;
int i;
new_active = old_active = bond->curr_active_slave;
if (!new_active) { /* there were no active slaves left */
if (bond->slave_cnt > 0) { /* found one slave */
new_active = bond->first_slave;
} else {
return NULL; /* still no slave, return NULL */
}
}
/* first try the primary link; if arping, a link must tx/rx traffic
* before it can be considered the curr_active_slave - also, we would skip
* slaves between the curr_active_slave and primary_slave that may be up
* and able to arp
*/
if ((bond->primary_slave) &&
(!bond->params.arp_interval) &&
(IS_UP(bond->primary_slave->dev))) {
new_active = bond->primary_slave;
}
/* remember where to stop iterating over the slaves */
old_active = new_active;
bond_for_each_slave_from(bond, new_active, i, old_active) {
if (IS_UP(new_active->dev)) {
if (new_active->link == BOND_LINK_UP) {
return new_active;
} else if (new_active->link == BOND_LINK_BACK) {
/* link up, but waiting for stabilization */
if (new_active->delay < mintime) {
mintime = new_active->delay;
bestslave = new_active;
}
}
}
}
return bestslave;
}
/**
* change_active_interface - change the active slave into the specified one
* @bond: our bonding struct
* @new: the new slave to make the active one
*
* Set the new slave to the bond's settings and unset them on the old
* curr_active_slave.
* Setting include flags, mc-list, promiscuity, allmulti, etc.
*
* If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
* because it is apparently the best available slave we have, even though its
* updelay hasn't timed out yet.
*
* Warning: Caller must hold curr_slave_lock for writing.
*/
static void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
{
struct slave *old_active = bond->curr_active_slave;
if (old_active == new_active) {
return;
}
if (new_active) {
if (new_active->link == BOND_LINK_BACK) {
if (USES_PRIMARY(bond->params.mode)) {
printk(KERN_INFO DRV_NAME
": %s: making interface %s the new "
"active one %d ms earlier.\n",
bond->dev->name, new_active->dev->name,
(bond->params.updelay - new_active->delay) * bond->params.miimon);
}
new_active->delay = 0;
new_active->link = BOND_LINK_UP;
new_active->jiffies = jiffies;
if (bond->params.mode == BOND_MODE_8023AD) {
bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
}
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
}
} else {
if (USES_PRIMARY(bond->params.mode)) {
printk(KERN_INFO DRV_NAME
": %s: making interface %s the new "
"active one.\n",
bond->dev->name, new_active->dev->name);
}
}
}
if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
if (old_active) {
bond_set_slave_inactive_flags(old_active);
}
if (new_active) {
bond_set_slave_active_flags(new_active);
}
}
if (USES_PRIMARY(bond->params.mode)) {
bond_mc_swap(bond, new_active, old_active);
}
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
bond_alb_handle_active_change(bond, new_active);
} else {
bond->curr_active_slave = new_active;
}
}
/**
* bond_select_active_slave - select a new active slave, if needed
* @bond: our bonding struct
*
* This functions shoud be called when one of the following occurs:
* - The old curr_active_slave has been released or lost its link.
* - The primary_slave has got its link back.
* - A slave has got its link back and there's no old curr_active_slave.
*
* Warning: Caller must hold curr_slave_lock for writing.
*/
static void bond_select_active_slave(struct bonding *bond)
{
struct slave *best_slave;
best_slave = bond_find_best_slave(bond);
if (best_slave != bond->curr_active_slave) {
bond_change_active_slave(bond, best_slave);
}
}
/*--------------------------- slave list handling ---------------------------*/
/*
* This function attaches the slave to the end of list.
*
* bond->lock held for writing by caller.
*/
static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
{
if (bond->first_slave == NULL) { /* attaching the first slave */
new_slave->next = new_slave;
new_slave->prev = new_slave;
bond->first_slave = new_slave;
} else {
new_slave->next = bond->first_slave;
new_slave->prev = bond->first_slave->prev;
new_slave->next->prev = new_slave;
new_slave->prev->next = new_slave;
}
bond->slave_cnt++;
}
/*
* This function detaches the slave from the list.
* WARNING: no check is made to verify if the slave effectively
* belongs to <bond>.
* Nothing is freed on return, structures are just unchained.
* If any slave pointer in bond was pointing to <slave>,
* it should be changed by the calling function.
*
* bond->lock held for writing by caller.
*/
static void bond_detach_slave(struct bonding *bond, struct slave *slave)
{
if (slave->next) {
slave->next->prev = slave->prev;
}
if (slave->prev) {
slave->prev->next = slave->next;
}
if (bond->first_slave == slave) { /* slave is the first slave */
if (bond->slave_cnt > 1) { /* there are more slave */
bond->first_slave = slave->next;
} else {
bond->first_slave = NULL; /* slave was the last one */
}
}
slave->next = NULL;
slave->prev = NULL;
bond->slave_cnt--;
}
/*---------------------------------- IOCTL ----------------------------------*/
static int bond_sethwaddr(struct net_device *bond_dev, struct net_device *slave_dev)
{
dprintk("bond_dev=%p\n", bond_dev);
dprintk("slave_dev=%p\n", slave_dev);
dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
return 0;
}
/* enslave device <slave> to bond device <master> */
static int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *new_slave = NULL;
struct dev_mc_list *dmi;
struct sockaddr addr;
int link_reporting;
int old_features = bond_dev->features;
int res = 0;
if (slave_dev->do_ioctl == NULL) {
printk(KERN_WARNING DRV_NAME
": Warning : no link monitoring support for %s\n",
slave_dev->name);
}
/* bond must be initialized by bond_open() before enslaving */
if (!(bond_dev->flags & IFF_UP)) {
dprintk("Error, master_dev is not up\n");
return -EPERM;
}
/* already enslaved */
if (slave_dev->flags & IFF_SLAVE) {
dprintk("Error, Device was already enslaved\n");
return -EBUSY;
}
/* vlan challenged mutual exclusion */
/* no need to lock since we're protected by rtnl_lock */
if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
if (!list_empty(&bond->vlan_list)) {
printk(KERN_ERR DRV_NAME
": Error: cannot enslave VLAN "
"challenged slave %s on VLAN enabled "
"bond %s\n", slave_dev->name,
bond_dev->name);
return -EPERM;
} else {
printk(KERN_WARNING DRV_NAME
": Warning: enslaved VLAN challenged "
"slave %s. Adding VLANs will be blocked as "
"long as %s is part of bond %s\n",
slave_dev->name, slave_dev->name,
bond_dev->name);
bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
}
} else {
dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
if (bond->slave_cnt == 0) {
/* First slave, and it is not VLAN challenged,
* so remove the block of adding VLANs over the bond.
*/
bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
}
}
if (app_abi_ver >= 1) {
/* The application is using an ABI, which requires the
* slave interface to be closed.
*/
if ((slave_dev->flags & IFF_UP)) {
printk(KERN_ERR DRV_NAME
": Error: %s is up\n",
slave_dev->name);
res = -EPERM;
goto err_undo_flags;
}
if (slave_dev->set_mac_address == NULL) {
printk(KERN_ERR DRV_NAME
": Error: The slave device you specified does "
"not support setting the MAC address.\n");
printk(KERN_ERR
"Your kernel likely does not support slave "
"devices.\n");
res = -EOPNOTSUPP;
goto err_undo_flags;
}
} else {
/* The application is not using an ABI, which requires the
* slave interface to be open.
*/
if (!(slave_dev->flags & IFF_UP)) {
printk(KERN_ERR DRV_NAME
": Error: %s is not running\n",
slave_dev->name);
res = -EINVAL;
goto err_undo_flags;
}
if ((bond->params.mode == BOND_MODE_8023AD) ||
(bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
printk(KERN_ERR DRV_NAME
": Error: to use %s mode, you must upgrade "
"ifenslave.\n",
bond_mode_name(bond->params.mode));
res = -EOPNOTSUPP;
goto err_undo_flags;
}
}
new_slave = kmalloc(sizeof(struct slave), GFP_KERNEL);
if (!new_slave) {
res = -ENOMEM;
goto err_undo_flags;
}
memset(new_slave, 0, sizeof(struct slave));
/* save slave's original flags before calling
* netdev_set_master and dev_open
*/
new_slave->original_flags = slave_dev->flags;
if (app_abi_ver >= 1) {
/* save slave's original ("permanent") mac address for
* modes that needs it, and for restoring it upon release,
* and then set it to the master's address
*/
memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
/* set slave to master's mac address
* The application already set the master's
* mac address to that of the first slave
*/
memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
addr.sa_family = slave_dev->type;
res = dev_set_mac_address(slave_dev, &addr);
if (res) {
dprintk("Error %d calling set_mac_address\n", res);
goto err_free;
}
/* open the slave since the application closed it */
res = dev_open(slave_dev);
if (res) {
dprintk("Openning slave %s failed\n", slave_dev->name);
goto err_restore_mac;
}
}
res = netdev_set_master(slave_dev, bond_dev);
if (res) {
dprintk("Error %d calling netdev_set_master\n", res);
if (app_abi_ver < 1) {
goto err_free;
} else {
goto err_close;
}
}
new_slave->dev = slave_dev;
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
/* bond_alb_init_slave() must be called before all other stages since
* it might fail and we do not want to have to undo everything
*/
res = bond_alb_init_slave(bond, new_slave);
if (res) {
goto err_unset_master;
}
}
/* If the mode USES_PRIMARY, then the new slave gets the
* master's promisc (and mc) settings only if it becomes the
* curr_active_slave, and that is taken care of later when calling
* bond_change_active()
*/
if (!USES_PRIMARY(bond->params.mode)) {
/* set promiscuity level to new slave */
if (bond_dev->flags & IFF_PROMISC) {
dev_set_promiscuity(slave_dev, 1);
}
/* set allmulti level to new slave */
if (bond_dev->flags & IFF_ALLMULTI) {
dev_set_allmulti(slave_dev, 1);
}
/* upload master's mc_list to new slave */
for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
}
}
if (bond->params.mode == BOND_MODE_8023AD) {
/* add lacpdu mc addr to mc list */
u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
}
bond_add_vlans_on_slave(bond, slave_dev);
write_lock_bh(&bond->lock);
bond_attach_slave(bond, new_slave);
new_slave->delay = 0;
new_slave->link_failure_count = 0;
if (bond->params.miimon && !bond->params.use_carrier) {
link_reporting = bond_check_dev_link(bond, slave_dev, 1);
if ((link_reporting == -1) && !bond->params.arp_interval) {
/*
* miimon is set but a bonded network driver
* does not support ETHTOOL/MII and
* arp_interval is not set. Note: if
* use_carrier is enabled, we will never go
* here (because netif_carrier is always
* supported); thus, we don't need to change
* the messages for netif_carrier.
*/
printk(KERN_WARNING DRV_NAME
": Warning: MII and ETHTOOL support not "
"available for interface %s, and "
"arp_interval/arp_ip_target module parameters "
"not specified, thus bonding will not detect "
"link failures! see bonding.txt for details.\n",
slave_dev->name);
} else if (link_reporting == -1) {
/* unable get link status using mii/ethtool */
printk(KERN_WARNING DRV_NAME
": Warning: can't get link status from "
"interface %s; the network driver associated "
"with this interface does not support MII or "
"ETHTOOL link status reporting, thus miimon "
"has no effect on this interface.\n",
slave_dev->name);
}
}
/* check for initial state */
if (!bond->params.miimon ||
(bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
if (bond->params.updelay) {
dprintk("Initial state of slave_dev is "
"BOND_LINK_BACK\n");
new_slave->link = BOND_LINK_BACK;
new_slave->delay = bond->params.updelay;
} else {
dprintk("Initial state of slave_dev is "
"BOND_LINK_UP\n");
new_slave->link = BOND_LINK_UP;
}
new_slave->jiffies = jiffies;
} else {
dprintk("Initial state of slave_dev is "
"BOND_LINK_DOWN\n");
new_slave->link = BOND_LINK_DOWN;
}
if (bond_update_speed_duplex(new_slave) &&
(new_slave->link != BOND_LINK_DOWN)) {
printk(KERN_WARNING DRV_NAME
": Warning: failed to get speed and duplex from %s, "
"assumed to be 100Mb/sec and Full.\n",
new_slave->dev->name);
if (bond->params.mode == BOND_MODE_8023AD) {
printk(KERN_WARNING
"Operation of 802.3ad mode requires ETHTOOL "
"support in base driver for proper aggregator "
"selection.\n");
}
}
if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
/* if there is a primary slave, remember it */
if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
bond->primary_slave = new_slave;
}
}
switch (bond->params.mode) {
case BOND_MODE_ACTIVEBACKUP:
/* if we're in active-backup mode, we need one and only one active
* interface. The backup interfaces will have their NOARP flag set
* because we need them to be completely deaf and not to respond to
* any ARP request on the network to avoid fooling a switch. Thus,
* since we guarantee that curr_active_slave always point to the last
* usable interface, we just have to verify this interface's flag.
*/
if (((!bond->curr_active_slave) ||
(bond->curr_active_slave->dev->flags & IFF_NOARP)) &&
(new_slave->link != BOND_LINK_DOWN)) {
dprintk("This is the first active slave\n");
/* first slave or no active slave yet, and this link
is OK, so make this interface the active one */
bond_change_active_slave(bond, new_slave);
} else {
dprintk("This is just a backup slave\n");
bond_set_slave_inactive_flags(new_slave);
}
break;
case BOND_MODE_8023AD:
/* in 802.3ad mode, the internal mechanism
* will activate the slaves in the selected
* aggregator
*/
bond_set_slave_inactive_flags(new_slave);
/* if this is the first slave */
if (bond->slave_cnt == 1) {
SLAVE_AD_INFO(new_slave).id = 1;
/* Initialize AD with the number of times that the AD timer is called in 1 second
* can be called only after the mac address of the bond is set
*/
bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
bond->params.lacp_fast);
} else {
SLAVE_AD_INFO(new_slave).id =
SLAVE_AD_INFO(new_slave->prev).id + 1;
}
bond_3ad_bind_slave(new_slave);
break;
case BOND_MODE_TLB:
case BOND_MODE_ALB:
new_slave->state = BOND_STATE_ACTIVE;
if ((!bond->curr_active_slave) &&
(new_slave->link != BOND_LINK_DOWN)) {
/* first slave or no active slave yet, and this link
* is OK, so make this interface the active one
*/
bond_change_active_slave(bond, new_slave);
}
break;
default:
dprintk("This slave is always active in trunk mode\n");
/* always active in trunk mode */
new_slave->state = BOND_STATE_ACTIVE;
/* In trunking mode there is little meaning to curr_active_slave
* anyway (it holds no special properties of the bond device),
* so we can change it without calling change_active_interface()
*/
if (!bond->curr_active_slave) {
bond->curr_active_slave = new_slave;
}
break;
} /* switch(bond_mode) */
write_unlock_bh(&bond->lock);
if (app_abi_ver < 1) {
/*
* !!! This is to support old versions of ifenslave.
* We can remove this in 2.5 because our ifenslave takes
* care of this for us.
* We check to see if the master has a mac address yet.
* If not, we'll give it the mac address of our slave device.
*/
int ndx = 0;
for (ndx = 0; ndx < bond_dev->addr_len; ndx++) {
dprintk("Checking ndx=%d of bond_dev->dev_addr\n",
ndx);
if (bond_dev->dev_addr[ndx] != 0) {
dprintk("Found non-zero byte at ndx=%d\n",
ndx);
break;
}
}
if (ndx == bond_dev->addr_len) {
/*
* We got all the way through the address and it was
* all 0's.
*/
dprintk("%s doesn't have a MAC address yet. \n",
bond_dev->name);
dprintk("Going to give assign it from %s.\n",
slave_dev->name);
bond_sethwaddr(bond_dev, slave_dev);
}
}
printk(KERN_INFO DRV_NAME
": %s: enslaving %s as a%s interface with a%s link.\n",
bond_dev->name, slave_dev->name,
new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
/* enslave is successful */
return 0;
/* Undo stages on error */
err_unset_master:
netdev_set_master(slave_dev, NULL);
err_close:
dev_close(slave_dev);
err_restore_mac:
memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
addr.sa_family = slave_dev->type;
dev_set_mac_address(slave_dev, &addr);
err_free:
kfree(new_slave);
err_undo_flags:
bond_dev->features = old_features;
return res;
}
/*
* Try to release the slave device <slave> from the bond device <master>
* It is legal to access curr_active_slave without a lock because all the function
* is write-locked.
*
* The rules for slave state should be:
* for Active/Backup:
* Active stays on all backups go down
* for Bonded connections:
* The first up interface should be left on and all others downed.
*/
static int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave, *oldcurrent;
struct sockaddr addr;
int mac_addr_differ;
/* slave is not a slave or master is not master of this slave */
if (!(slave_dev->flags & IFF_SLAVE) ||
(slave_dev->master != bond_dev)) {
printk(KERN_ERR DRV_NAME
": Error: %s: cannot release %s.\n",
bond_dev->name, slave_dev->name);
return -EINVAL;
}
write_lock_bh(&bond->lock);
slave = bond_get_slave_by_dev(bond, slave_dev);
if (!slave) {
/* not a slave of this bond */
printk(KERN_INFO DRV_NAME
": %s: %s not enslaved\n",
bond_dev->name, slave_dev->name);
return -EINVAL;
}
mac_addr_differ = memcmp(bond_dev->dev_addr,
slave->perm_hwaddr,
ETH_ALEN);
if (!mac_addr_differ && (bond->slave_cnt > 1)) {
printk(KERN_WARNING DRV_NAME
": Warning: the permanent HWaddr of %s "
"- %02X:%02X:%02X:%02X:%02X:%02X - is "
"still in use by %s. Set the HWaddr of "
"%s to a different address to avoid "
"conflicts.\n",
slave_dev->name,
slave->perm_hwaddr[0],
slave->perm_hwaddr[1],
slave->perm_hwaddr[2],
slave->perm_hwaddr[3],
slave->perm_hwaddr[4],
slave->perm_hwaddr[5],
bond_dev->name,
slave_dev->name);
}
/* Inform AD package of unbinding of slave. */
if (bond->params.mode == BOND_MODE_8023AD) {
/* must be called before the slave is
* detached from the list
*/
bond_3ad_unbind_slave(slave);
}
printk(KERN_INFO DRV_NAME
": %s: releasing %s interface %s\n",
bond_dev->name,
(slave->state == BOND_STATE_ACTIVE)
? "active" : "backup",
slave_dev->name);
oldcurrent = bond->curr_active_slave;
bond->current_arp_slave = NULL;
/* release the slave from its bond */
bond_detach_slave(bond, slave);
if (bond->primary_slave == slave) {
bond->primary_slave = NULL;
}
if (oldcurrent == slave) {
bond_change_active_slave(bond, NULL);
}
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
/* Must be called only after the slave has been
* detached from the list and the curr_active_slave
* has been cleared (if our_slave == old_current),
* but before a new active slave is selected.
*/
bond_alb_deinit_slave(bond, slave);
}
if (oldcurrent == slave) {
bond_select_active_slave(bond);
if (!bond->curr_active_slave) {
printk(KERN_INFO DRV_NAME
": %s: now running without any active "
"interface !\n",
bond_dev->name);
}
}
if (bond->slave_cnt == 0) {
/* if the last slave was removed, zero the mac address
* of the master so it will be set by the application
* to the mac address of the first slave
*/
memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
if (list_empty(&bond->vlan_list)) {
bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
} else {
printk(KERN_WARNING DRV_NAME
": Warning: clearing HW address of %s while it "
"still has VLANs.\n",
bond_dev->name);
printk(KERN_WARNING DRV_NAME
": When re-adding slaves, make sure the bond's "
"HW address matches its VLANs'.\n");
}
} else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
!bond_has_challenged_slaves(bond)) {
printk(KERN_INFO DRV_NAME
": last VLAN challenged slave %s "
"left bond %s. VLAN blocking is removed\n",
slave_dev->name, bond_dev->name);
bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
}
write_unlock_bh(&bond->lock);
bond_del_vlans_from_slave(bond, slave_dev);
/* If the mode USES_PRIMARY, then we should only remove its
* promisc and mc settings if it was the curr_active_slave, but that was
* already taken care of above when we detached the slave
*/
if (!USES_PRIMARY(bond->params.mode)) {
/* unset promiscuity level from slave */
if (bond_dev->flags & IFF_PROMISC) {
dev_set_promiscuity(slave_dev, -1);
}
/* unset allmulti level from slave */
if (bond_dev->flags & IFF_ALLMULTI) {
dev_set_allmulti(slave_dev, -1);
}
/* flush master's mc_list from slave */
bond_mc_list_flush(bond_dev, slave_dev);
}
netdev_set_master(slave_dev, NULL);
/* close slave before restoring its mac address */
dev_close(slave_dev);
if (app_abi_ver >= 1) {
/* restore original ("permanent") mac address */
memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
addr.sa_family = slave_dev->type;
dev_set_mac_address(slave_dev, &addr);
}
/* restore the original state of the
* IFF_NOARP flag that might have been
* set by bond_set_slave_inactive_flags()
*/
if ((slave->original_flags & IFF_NOARP) == 0) {
slave_dev->flags &= ~IFF_NOARP;
}
kfree(slave);
return 0; /* deletion OK */
}
/*
* This function releases all slaves.
*/
static int bond_release_all(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave;
struct net_device *slave_dev;
struct sockaddr addr;
write_lock_bh(&bond->lock);
if (bond->slave_cnt == 0) {
goto out;
}
bond->current_arp_slave = NULL;
bond->primary_slave = NULL;
bond_change_active_slave(bond, NULL);
while ((slave = bond->first_slave) != NULL) {
/* Inform AD package of unbinding of slave
* before slave is detached from the list.
*/
if (bond->params.mode == BOND_MODE_8023AD) {
bond_3ad_unbind_slave(slave);
}
slave_dev = slave->dev;
bond_detach_slave(bond, slave);
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
/* must be called only after the slave
* has been detached from the list
*/
bond_alb_deinit_slave(bond, slave);
}
/* now that the slave is detached, unlock and perform
* all the undo steps that should not be called from
* within a lock.
*/
write_unlock_bh(&bond->lock);
bond_del_vlans_from_slave(bond, slave_dev);
/* If the mode USES_PRIMARY, then we should only remove its
* promisc and mc settings if it was the curr_active_slave, but that was
* already taken care of above when we detached the slave
*/
if (!USES_PRIMARY(bond->params.mode)) {
/* unset promiscuity level from slave */
if (bond_dev->flags & IFF_PROMISC) {
dev_set_promiscuity(slave_dev, -1);
}
/* unset allmulti level from slave */
if (bond_dev->flags & IFF_ALLMULTI) {
dev_set_allmulti(slave_dev, -1);
}
/* flush master's mc_list from slave */
bond_mc_list_flush(bond_dev, slave_dev);
}
netdev_set_master(slave_dev, NULL);
/* close slave before restoring its mac address */
dev_close(slave_dev);
if (app_abi_ver >= 1) {
/* restore original ("permanent") mac address*/
memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
addr.sa_family = slave_dev->type;
dev_set_mac_address(slave_dev, &addr);
}
/* restore the original state of the IFF_NOARP flag that might have
* been set by bond_set_slave_inactive_flags()
*/
if ((slave->original_flags & IFF_NOARP) == 0) {
slave_dev->flags &= ~IFF_NOARP;
}
kfree(slave);
/* re-acquire the lock before getting the next slave */
write_lock_bh(&bond->lock);
}
/* zero the mac address of the master so it will be
* set by the application to the mac address of the
* first slave
*/
memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
if (list_empty(&bond->vlan_list)) {
bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
} else {
printk(KERN_WARNING DRV_NAME
": Warning: clearing HW address of %s while it "
"still has VLANs.\n",
bond_dev->name);
printk(KERN_WARNING DRV_NAME
": When re-adding slaves, make sure the bond's "
"HW address matches its VLANs'.\n");
}
printk(KERN_INFO DRV_NAME
": %s: released all slaves\n",
bond_dev->name);
out:
write_unlock_bh(&bond->lock);
return 0;
}
/*
* This function changes the active slave to slave <slave_dev>.
* It returns -EINVAL in the following cases.
* - <slave_dev> is not found in the list.
* - There is not active slave now.
* - <slave_dev> is already active.
* - The link state of <slave_dev> is not BOND_LINK_UP.
* - <slave_dev> is not running.
* In these cases, this fuction does nothing.
* In the other cases, currnt_slave pointer is changed and 0 is returned.
*/
static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *old_active = NULL;
struct slave *new_active = NULL;
int res = 0;
if (!USES_PRIMARY(bond->params.mode)) {
return -EINVAL;
}
/* Verify that master_dev is indeed the master of slave_dev */
if (!(slave_dev->flags & IFF_SLAVE) ||
(slave_dev->master != bond_dev)) {
return -EINVAL;
}
write_lock_bh(&bond->lock);
old_active = bond->curr_active_slave;
new_active = bond_get_slave_by_dev(bond, slave_dev);
/*
* Changing to the current active: do nothing; return success.
*/
if (new_active && (new_active == old_active)) {
write_unlock_bh(&bond->lock);
return 0;
}
if ((new_active) &&
(old_active) &&
(new_active->link == BOND_LINK_UP) &&
IS_UP(new_active->dev)) {
bond_change_active_slave(bond, new_active);
} else {
res = -EINVAL;
}
write_unlock_bh(&bond->lock);
return res;
}
static int bond_ethtool_ioctl(struct net_device *bond_dev, struct ifreq *ifr)
{
struct ethtool_drvinfo info;
void __user *addr = ifr->ifr_data;
uint32_t cmd;
if (get_user(cmd, (uint32_t __user *)addr)) {
return -EFAULT;
}
switch (cmd) {
case ETHTOOL_GDRVINFO:
if (copy_from_user(&info, addr, sizeof(info))) {
return -EFAULT;
}
if (strcmp(info.driver, "ifenslave") == 0) {
int new_abi_ver;
char *endptr;
new_abi_ver = simple_strtoul(info.fw_version,
&endptr, 0);
if (*endptr) {
printk(KERN_ERR DRV_NAME
": Error: got invalid ABI "
"version from application\n");
return -EINVAL;
}
if (orig_app_abi_ver == -1) {
orig_app_abi_ver = new_abi_ver;
}
app_abi_ver = new_abi_ver;
}
strncpy(info.driver, DRV_NAME, 32);
strncpy(info.version, DRV_VERSION, 32);
snprintf(info.fw_version, 32, "%d", BOND_ABI_VERSION);
if (copy_to_user(addr, &info, sizeof(info))) {
return -EFAULT;
}
return 0;
default:
return -EOPNOTSUPP;
}
}
static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
{
struct bonding *bond = bond_dev->priv;
info->bond_mode = bond->params.mode;
info->miimon = bond->params.miimon;
read_lock_bh(&bond->lock);
info->num_slaves = bond->slave_cnt;
read_unlock_bh(&bond->lock);
return 0;
}
static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave;
int i, found = 0;
if (info->slave_id < 0) {
return -ENODEV;
}
read_lock_bh(&bond->lock);
bond_for_each_slave(bond, slave, i) {
if (i == (int)info->slave_id) {
found = 1;
break;
}
}
read_unlock_bh(&bond->lock);
if (found) {
strcpy(info->slave_name, slave->dev->name);
info->link = slave->link;
info->state = slave->state;
info->link_failure_count = slave->link_failure_count;
} else {
return -ENODEV;
}
return 0;
}
/*-------------------------------- Monitoring -------------------------------*/
/* this function is called regularly to monitor each slave's link. */
static void bond_mii_monitor(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave, *oldcurrent;
int do_failover = 0;
int delta_in_ticks;
int i;
read_lock(&bond->lock);
delta_in_ticks = (bond->params.miimon * HZ) / 1000;
if (bond->kill_timers) {
goto out;
}
if (bond->slave_cnt == 0) {
goto re_arm;
}
/* we will try to read the link status of each of our slaves, and
* set their IFF_RUNNING flag appropriately. For each slave not
* supporting MII status, we won't do anything so that a user-space
* program could monitor the link itself if needed.
*/
read_lock(&bond->curr_slave_lock);
oldcurrent = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
bond_for_each_slave(bond, slave, i) {
struct net_device *slave_dev = slave->dev;
int link_state;
u16 old_speed = slave->speed;
u8 old_duplex = slave->duplex;
link_state = bond_check_dev_link(bond, slave_dev, 0);
switch (slave->link) {
case BOND_LINK_UP: /* the link was up */
if (link_state == BMSR_LSTATUS) {
/* link stays up, nothing more to do */
break;
} else { /* link going down */
slave->link = BOND_LINK_FAIL;
slave->delay = bond->params.downdelay;
if (slave->link_failure_count < UINT_MAX) {
slave->link_failure_count++;
}
if (bond->params.downdelay) {
printk(KERN_INFO DRV_NAME
": %s: link status down for %s "
"interface %s, disabling it in "
"%d ms.\n",
bond_dev->name,
IS_UP(slave_dev)
? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
? ((slave == oldcurrent)
? "active " : "backup ")
: "")
: "idle ",
slave_dev->name,
bond->params.downdelay * bond->params.miimon);
}
}
/* no break ! fall through the BOND_LINK_FAIL test to
ensure proper action to be taken
*/
case BOND_LINK_FAIL: /* the link has just gone down */
if (link_state != BMSR_LSTATUS) {
/* link stays down */
if (slave->delay <= 0) {
/* link down for too long time */
slave->link = BOND_LINK_DOWN;
/* in active/backup mode, we must
* completely disable this interface
*/
if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
(bond->params.mode == BOND_MODE_8023AD)) {
bond_set_slave_inactive_flags(slave);
}
printk(KERN_INFO DRV_NAME
": %s: link status definitely "
"down for interface %s, "
"disabling it\n",
bond_dev->name,
slave_dev->name);
/* notify ad that the link status has changed */
if (bond->params.mode == BOND_MODE_8023AD) {
bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
}
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
}
if (slave == oldcurrent) {
do_failover = 1;
}
} else {
slave->delay--;
}
} else {
/* link up again */
slave->link = BOND_LINK_UP;
slave->jiffies = jiffies;
printk(KERN_INFO DRV_NAME
": %s: link status up again after %d "
"ms for interface %s.\n",
bond_dev->name,
(bond->params.downdelay - slave->delay) * bond->params.miimon,
slave_dev->name);
}
break;
case BOND_LINK_DOWN: /* the link was down */
if (link_state != BMSR_LSTATUS) {
/* the link stays down, nothing more to do */
break;
} else { /* link going up */
slave->link = BOND_LINK_BACK;
slave->delay = bond->params.updelay;
if (bond->params.updelay) {
/* if updelay == 0, no need to
advertise about a 0 ms delay */
printk(KERN_INFO DRV_NAME
": %s: link status up for "
"interface %s, enabling it "
"in %d ms.\n",
bond_dev->name,
slave_dev->name,
bond->params.updelay * bond->params.miimon);
}
}
/* no break ! fall through the BOND_LINK_BACK state in
case there's something to do.
*/
case BOND_LINK_BACK: /* the link has just come back */
if (link_state != BMSR_LSTATUS) {
/* link down again */
slave->link = BOND_LINK_DOWN;
printk(KERN_INFO DRV_NAME
": %s: link status down again after %d "
"ms for interface %s.\n",
bond_dev->name,
(bond->params.updelay - slave->delay) * bond->params.miimon,
slave_dev->name);
} else {
/* link stays up */
if (slave->delay == 0) {
/* now the link has been up for long time enough */
slave->link = BOND_LINK_UP;
slave->jiffies = jiffies;
if (bond->params.mode == BOND_MODE_8023AD) {
/* prevent it from being the active one */
slave->state = BOND_STATE_BACKUP;
} else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
/* make it immediately active */
slave->state = BOND_STATE_ACTIVE;
} else if (slave != bond->primary_slave) {
/* prevent it from being the active one */
slave->state = BOND_STATE_BACKUP;
}
printk(KERN_INFO DRV_NAME
": %s: link status definitely "
"up for interface %s.\n",
bond_dev->name,
slave_dev->name);
/* notify ad that the link status has changed */
if (bond->params.mode == BOND_MODE_8023AD) {
bond_3ad_handle_link_change(slave, BOND_LINK_UP);
}
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
}
if ((!oldcurrent) ||
(slave == bond->primary_slave)) {
do_failover = 1;
}
} else {
slave->delay--;
}
}
break;
default:
/* Should not happen */
printk(KERN_ERR "bonding: Error: %s Illegal value (link=%d)\n",
slave->dev->name, slave->link);
goto out;
} /* end of switch (slave->link) */
bond_update_speed_duplex(slave);
if (bond->params.mode == BOND_MODE_8023AD) {
if (old_speed != slave->speed) {
bond_3ad_adapter_speed_changed(slave);
}
if (old_duplex != slave->duplex) {
bond_3ad_adapter_duplex_changed(slave);
}
}
} /* end of for */
if (do_failover) {
write_lock(&bond->curr_slave_lock);
bond_select_active_slave(bond);
if (oldcurrent && !bond->curr_active_slave) {
printk(KERN_INFO DRV_NAME
": %s: now running without any active "
"interface !\n",
bond_dev->name);
}
write_unlock(&bond->curr_slave_lock);
}
re_arm:
if (bond->params.miimon) {
mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
}
out:
read_unlock(&bond->lock);
}
static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
{
int i;
u32 *targets = bond->params.arp_targets;
for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
arp_send(ARPOP_REQUEST, ETH_P_ARP, targets[i], slave->dev,
my_ip, NULL, slave->dev->dev_addr,
NULL);
}
}
/*
* this function is called regularly to monitor each slave's link
* ensuring that traffic is being sent and received when arp monitoring
* is used in load-balancing mode. if the adapter has been dormant, then an
* arp is transmitted to generate traffic. see activebackup_arp_monitor for
* arp monitoring in active backup mode.
*/
static void bond_loadbalance_arp_mon(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave, *oldcurrent;
int do_failover = 0;
int delta_in_ticks;
int i;
read_lock(&bond->lock);
delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
if (bond->kill_timers) {
goto out;
}
if (bond->slave_cnt == 0) {
goto re_arm;
}
read_lock(&bond->curr_slave_lock);
oldcurrent = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
/* see if any of the previous devices are up now (i.e. they have
* xmt and rcv traffic). the curr_active_slave does not come into
* the picture unless it is null. also, slave->jiffies is not needed
* here because we send an arp on each slave and give a slave as
* long as it needs to get the tx/rx within the delta.
* TODO: what about up/down delay in arp mode? it wasn't here before
* so it can wait
*/
bond_for_each_slave(bond, slave, i) {
if (slave->link != BOND_LINK_UP) {
if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
slave->link = BOND_LINK_UP;
slave->state = BOND_STATE_ACTIVE;
/* primary_slave has no meaning in round-robin
* mode. the window of a slave being up and
* curr_active_slave being null after enslaving
* is closed.
*/
if (!oldcurrent) {
printk(KERN_INFO DRV_NAME
": %s: link status definitely "
"up for interface %s, ",
bond_dev->name,
slave->dev->name);
do_failover = 1;
} else {
printk(KERN_INFO DRV_NAME
": %s: interface %s is now up\n",
bond_dev->name,
slave->dev->name);
}
}
} else {
/* slave->link == BOND_LINK_UP */
/* not all switches will respond to an arp request
* when the source ip is 0, so don't take the link down
* if we don't know our ip yet
*/
if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
(((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
my_ip)) {
slave->link = BOND_LINK_DOWN;
slave->state = BOND_STATE_BACKUP;
if (slave->link_failure_count < UINT_MAX) {
slave->link_failure_count++;
}
printk(KERN_INFO DRV_NAME
": %s: interface %s is now down.\n",
bond_dev->name,
slave->dev->name);
if (slave == oldcurrent) {
do_failover = 1;
}
}
}
/* note: if switch is in round-robin mode, all links
* must tx arp to ensure all links rx an arp - otherwise
* links may oscillate or not come up at all; if switch is
* in something like xor mode, there is nothing we can
* do - all replies will be rx'ed on same link causing slaves
* to be unstable during low/no traffic periods
*/
if (IS_UP(slave->dev)) {
bond_arp_send_all(bond, slave);
}
}
if (do_failover) {
write_lock(&bond->curr_slave_lock);
bond_select_active_slave(bond);
if (oldcurrent && !bond->curr_active_slave) {
printk(KERN_INFO DRV_NAME
": %s: now running without any active "
"interface !\n",
bond_dev->name);
}
write_unlock(&bond->curr_slave_lock);
}
re_arm:
if (bond->params.arp_interval) {
mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
}
out:
read_unlock(&bond->lock);
}
/*
* When using arp monitoring in active-backup mode, this function is
* called to determine if any backup slaves have went down or a new
* current slave needs to be found.
* The backup slaves never generate traffic, they are considered up by merely
* receiving traffic. If the current slave goes down, each backup slave will
* be given the opportunity to tx/rx an arp before being taken down - this
* prevents all slaves from being taken down due to the current slave not
* sending any traffic for the backups to receive. The arps are not necessarily
* necessary, any tx and rx traffic will keep the current slave up. While any
* rx traffic will keep the backup slaves up, the current slave is responsible
* for generating traffic to keep them up regardless of any other traffic they
* may have received.
* see loadbalance_arp_monitor for arp monitoring in load balancing mode
*/
static void bond_activebackup_arp_mon(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave;
int delta_in_ticks;
int i;
read_lock(&bond->lock);
delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
if (bond->kill_timers) {
goto out;
}
if (bond->slave_cnt == 0) {
goto re_arm;
}
/* determine if any slave has come up or any backup slave has
* gone down
* TODO: what about up/down delay in arp mode? it wasn't here before
* so it can wait
*/
bond_for_each_slave(bond, slave, i) {
if (slave->link != BOND_LINK_UP) {
if ((jiffies - slave->dev->last_rx) <= delta_in_ticks) {
slave->link = BOND_LINK_UP;
write_lock(&bond->curr_slave_lock);
if ((!bond->curr_active_slave) &&
((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
bond_change_active_slave(bond, slave);
bond->current_arp_slave = NULL;
} else if (bond->curr_active_slave != slave) {
/* this slave has just come up but we
* already have a current slave; this
* can also happen if bond_enslave adds
* a new slave that is up while we are
* searching for a new slave
*/
bond_set_slave_inactive_flags(slave);
bond->current_arp_slave = NULL;
}
if (slave == bond->curr_active_slave) {
printk(KERN_INFO DRV_NAME
": %s: %s is up and now the "
"active interface\n",
bond_dev->name,
slave->dev->name);
} else {
printk(KERN_INFO DRV_NAME
": %s: backup interface %s is "
"now up\n",
bond_dev->name,
slave->dev->name);
}
write_unlock(&bond->curr_slave_lock);
}
} else {
read_lock(&bond->curr_slave_lock);
if ((slave != bond->curr_active_slave) &&
(!bond->current_arp_slave) &&
(((jiffies - slave->dev->last_rx) >= 3*delta_in_ticks) &&
my_ip)) {
/* a backup slave has gone down; three times
* the delta allows the current slave to be
* taken out before the backup slave.
* note: a non-null current_arp_slave indicates
* the curr_active_slave went down and we are
* searching for a new one; under this
* condition we only take the curr_active_slave
* down - this gives each slave a chance to
* tx/rx traffic before being taken out
*/
read_unlock(&bond->curr_slave_lock);
slave->link = BOND_LINK_DOWN;
if (slave->link_failure_count < UINT_MAX) {
slave->link_failure_count++;
}
bond_set_slave_inactive_flags(slave);
printk(KERN_INFO DRV_NAME
": %s: backup interface %s is now down\n",
bond_dev->name,
slave->dev->name);
} else {
read_unlock(&bond->curr_slave_lock);
}
}
}
read_lock(&bond->curr_slave_lock);
slave = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
if (slave) {
/* if we have sent traffic in the past 2*arp_intervals but
* haven't xmit and rx traffic in that time interval, select
* a different slave. slave->jiffies is only updated when
* a slave first becomes the curr_active_slave - not necessarily
* after every arp; this ensures the slave has a full 2*delta
* before being taken out. if a primary is being used, check
* if it is up and needs to take over as the curr_active_slave
*/
if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
(((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
my_ip)) &&
((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
slave->link = BOND_LINK_DOWN;
if (slave->link_failure_count < UINT_MAX) {
slave->link_failure_count++;
}
printk(KERN_INFO DRV_NAME
": %s: link status down for active interface "
"%s, disabling it\n",
bond_dev->name,
slave->dev->name);
write_lock(&bond->curr_slave_lock);
bond_select_active_slave(bond);
slave = bond->curr_active_slave;
write_unlock(&bond->curr_slave_lock);
bond->current_arp_slave = slave;
if (slave) {
slave->jiffies = jiffies;
}
} else if ((bond->primary_slave) &&
(bond->primary_slave != slave) &&
(bond->primary_slave->link == BOND_LINK_UP)) {
/* at this point, slave is the curr_active_slave */
printk(KERN_INFO DRV_NAME
": %s: changing from interface %s to primary "
"interface %s\n",
bond_dev->name,
slave->dev->name,
bond->primary_slave->dev->name);
/* primary is up so switch to it */
write_lock(&bond->curr_slave_lock);
bond_change_active_slave(bond, bond->primary_slave);
write_unlock(&bond->curr_slave_lock);
slave = bond->primary_slave;
slave->jiffies = jiffies;
} else {
bond->current_arp_slave = NULL;
}
/* the current slave must tx an arp to ensure backup slaves
* rx traffic
*/
if (slave && my_ip) {
bond_arp_send_all(bond, slave);
}
}
/* if we don't have a curr_active_slave, search for the next available
* backup slave from the current_arp_slave and make it the candidate
* for becoming the curr_active_slave
*/
if (!slave) {
if (!bond->current_arp_slave) {
bond->current_arp_slave = bond->first_slave;
}
if (bond->current_arp_slave) {
bond_set_slave_inactive_flags(bond->current_arp_slave);
/* search for next candidate */
bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->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;
switch (event) {
case NETDEV_UNREGISTER:
if (bond_dev) {
bond_release(bond_dev, slave_dev);
}
break;
case NETDEV_CHANGE:
/*
* TODO: is this what we get if somebody
* sets up a hierarchical bond, then rmmod's
* one of the slave bonding devices?
*/
break;
case NETDEV_DOWN:
/*
* ... Or is it this?
*/
break;
case NETDEV_CHANGEMTU:
/*
* TODO: Should slaves be allowed to
* independently alter their MTU? For
* an active-backup bond, slaves need
* not be the same type of device, so
* MTUs may vary. For other modes,
* slaves arguably should have the
* same MTUs. To do this, we'd need to
* take over the slave's change_mtu
* function for the duration of their
* servitude.
*/
break;
case NETDEV_CHANGENAME:
/*
* TODO: handle changing the primary's name
*/
break;
default:
break;
}
return NOTIFY_DONE;
}
/*
* bond_netdev_event: handle netdev notifier chain events.
*
* This function receives events for the netdev chain. The caller (an
* ioctl handler calling notifier_call_chain) holds the necessary
* locks for us to safely manipulate the slave devices (RTNL lock,
* dev_probe_lock).
*/
static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
{
struct net_device *event_dev = (struct net_device *)ptr;
dprintk("event_dev: %s, event: %lx\n",
(event_dev ? event_dev->name : "None"),
event);
if (event_dev->flags & IFF_MASTER) {
dprintk("IFF_MASTER\n");
return bond_master_netdev_event(event, event_dev);
}
if (event_dev->flags & IFF_SLAVE) {
dprintk("IFF_SLAVE\n");
return bond_slave_netdev_event(event, event_dev);
}
return NOTIFY_DONE;
}
static struct notifier_block bond_netdev_notifier = {
.notifier_call = bond_netdev_event,
};
/*-------------------------- Packet type handling ---------------------------*/
/* register to receive lacpdus on a bond */
static void bond_register_lacpdu(struct bonding *bond)
{
struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
/* initialize packet type */
pk_type->type = PKT_TYPE_LACPDU;
pk_type->dev = bond->dev;
pk_type->func = bond_3ad_lacpdu_recv;
dev_add_pack(pk_type);
}
/* unregister to receive lacpdus on a bond */
static void bond_unregister_lacpdu(struct bonding *bond)
{
dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
}
/*-------------------------- Device entry points ----------------------------*/
static int bond_open(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct timer_list *mii_timer = &bond->mii_timer;
struct timer_list *arp_timer = &bond->arp_timer;
bond->kill_timers = 0;
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
/* bond_alb_initialize must be called before the timer
* is started.
*/
if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
/* something went wrong - fail the open operation */
return -1;
}
init_timer(alb_timer);
alb_timer->expires = jiffies + 1;
alb_timer->data = (unsigned long)bond;
alb_timer->function = (void *)&bond_alb_monitor;
add_timer(alb_timer);
}
if (bond->params.miimon) { /* link check interval, in milliseconds. */
init_timer(mii_timer);
mii_timer->expires = jiffies + 1;
mii_timer->data = (unsigned long)bond_dev;
mii_timer->function = (void *)&bond_mii_monitor;
add_timer(mii_timer);
}
if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
init_timer(arp_timer);
arp_timer->expires = jiffies + 1;
arp_timer->data = (unsigned long)bond_dev;
if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
arp_timer->function = (void *)&bond_activebackup_arp_mon;
} else {
arp_timer->function = (void *)&bond_loadbalance_arp_mon;
}
add_timer(arp_timer);
}
if (bond->params.mode == BOND_MODE_8023AD) {
struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
init_timer(ad_timer);
ad_timer->expires = jiffies + 1;
ad_timer->data = (unsigned long)bond;
ad_timer->function = (void *)&bond_3ad_state_machine_handler;
add_timer(ad_timer);
/* register to receive LACPDUs */
bond_register_lacpdu(bond);
}
return 0;
}
static int bond_close(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
if (bond->params.mode == BOND_MODE_8023AD) {
/* Unregister the receive of LACPDUs */
bond_unregister_lacpdu(bond);
}
write_lock_bh(&bond->lock);
bond_mc_list_destroy(bond);
/* signal timers not to re-arm */
bond->kill_timers = 1;
write_unlock_bh(&bond->lock);
/* del_timer_sync must run without holding the bond->lock
* because a running timer might be trying to hold it too
*/
if (bond->params.miimon) { /* link check interval, in milliseconds. */
del_timer_sync(&bond->mii_timer);
}
if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
del_timer_sync(&bond->arp_timer);
}
switch (bond->params.mode) {
case BOND_MODE_8023AD:
del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
break;
case BOND_MODE_TLB:
case BOND_MODE_ALB:
del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
break;
default:
break;
}
/* Release the bonded slaves */
bond_release_all(bond_dev);
if ((bond->params.mode == BOND_MODE_TLB) ||
(bond->params.mode == BOND_MODE_ALB)) {
/* Must be called only after all
* slaves have been released
*/
bond_alb_deinitialize(bond);
}
return 0;
}
static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct net_device_stats *stats = &(bond->stats), *sstats;
struct slave *slave;
int i;
memset(stats, 0, sizeof(struct net_device_stats));
read_lock_bh(&bond->lock);
bond_for_each_slave(bond, slave, i) {
sstats = slave->dev->get_stats(slave->dev);
stats->rx_packets += sstats->rx_packets;
stats->rx_bytes += sstats->rx_bytes;
stats->rx_errors += sstats->rx_errors;
stats->rx_dropped += sstats->rx_dropped;
stats->tx_packets += sstats->tx_packets;
stats->tx_bytes += sstats->tx_bytes;
stats->tx_errors += sstats->tx_errors;
stats->tx_dropped += sstats->tx_dropped;
stats->multicast += sstats->multicast;
stats->collisions += sstats->collisions;
stats->rx_length_errors += sstats->rx_length_errors;
stats->rx_over_errors += sstats->rx_over_errors;
stats->rx_crc_errors += sstats->rx_crc_errors;
stats->rx_frame_errors += sstats->rx_frame_errors;
stats->rx_fifo_errors += sstats->rx_fifo_errors;
stats->rx_missed_errors += sstats->rx_missed_errors;
stats->tx_aborted_errors += sstats->tx_aborted_errors;
stats->tx_carrier_errors += sstats->tx_carrier_errors;
stats->tx_fifo_errors += sstats->tx_fifo_errors;
stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
stats->tx_window_errors += sstats->tx_window_errors;
}
read_unlock_bh(&bond->lock);
return stats;
}
static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
{
struct net_device *slave_dev = NULL;
struct ifbond k_binfo;
struct ifbond __user *u_binfo = NULL;
struct ifslave k_sinfo;
struct ifslave __user *u_sinfo = NULL;
struct mii_ioctl_data *mii = NULL;
int prev_abi_ver = orig_app_abi_ver;
int res = 0;
dprintk("bond_ioctl: master=%s, cmd=%d\n",
bond_dev->name, cmd);
switch (cmd) {
case SIOCETHTOOL:
return bond_ethtool_ioctl(bond_dev, ifr);
case SIOCGMIIPHY:
mii = if_mii(ifr);
if (!mii) {
return -EINVAL;
}
mii->phy_id = 0;
/* Fall Through */
case SIOCGMIIREG:
/*
* We do this again just in case we were called by SIOCGMIIREG
* instead of SIOCGMIIPHY.
*/
mii = if_mii(ifr);
if (!mii) {
return -EINVAL;
}
if (mii->reg_num == 1) {
struct bonding *bond = bond_dev->priv;
mii->val_out = 0;
read_lock_bh(&bond->lock);
read_lock(&bond->curr_slave_lock);
if (bond->curr_active_slave) {
mii->val_out = BMSR_LSTATUS;
}
read_unlock(&bond->curr_slave_lock);
read_unlock_bh(&bond->lock);
}
return 0;
case BOND_INFO_QUERY_OLD:
case SIOCBONDINFOQUERY:
u_binfo = (struct ifbond __user *)ifr->ifr_data;
if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
return -EFAULT;
}
res = bond_info_query(bond_dev, &k_binfo);
if (res == 0) {
if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
return -EFAULT;
}
}
return res;
case BOND_SLAVE_INFO_QUERY_OLD:
case SIOCBONDSLAVEINFOQUERY:
u_sinfo = (struct ifslave __user *)ifr->ifr_data;
if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
return -EFAULT;
}
res = bond_slave_info_query(bond_dev, &k_sinfo);
if (res == 0) {
if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
return -EFAULT;
}
}
return res;
default:
/* Go on */
break;
}
if (!capable(CAP_NET_ADMIN)) {
return -EPERM;
}
if (orig_app_abi_ver == -1) {
/* no orig_app_abi_ver was provided yet, so we'll use the
* current one from now on, even if it's 0
*/
orig_app_abi_ver = app_abi_ver;
} else if (orig_app_abi_ver != app_abi_ver) {
printk(KERN_ERR DRV_NAME
": Error: already using ifenslave ABI version %d; to "
"upgrade ifenslave to version %d, you must first "
"reload bonding.\n",
orig_app_abi_ver, app_abi_ver);
return -EINVAL;
}
slave_dev = dev_get_by_name(ifr->ifr_slave);
dprintk("slave_dev=%p: \n", slave_dev);
if (!slave_dev) {
res = -ENODEV;
} else {
dprintk("slave_dev->name=%s: \n", slave_dev->name);
switch (cmd) {
case BOND_ENSLAVE_OLD:
case SIOCBONDENSLAVE:
res = bond_enslave(bond_dev, slave_dev);
break;
case BOND_RELEASE_OLD:
case SIOCBONDRELEASE:
res = bond_release(bond_dev, slave_dev);
break;
case BOND_SETHWADDR_OLD:
case SIOCBONDSETHWADDR:
res = bond_sethwaddr(bond_dev, slave_dev);
break;
case BOND_CHANGE_ACTIVE_OLD:
case SIOCBONDCHANGEACTIVE:
res = bond_ioctl_change_active(bond_dev, slave_dev);
break;
default:
res = -EOPNOTSUPP;
}
dev_put(slave_dev);
}
if (res < 0) {
/* The ioctl failed, so there's no point in changing the
* orig_app_abi_ver. We'll restore it's value just in case
* we've changed it earlier in this function.
*/
orig_app_abi_ver = prev_abi_ver;
}
return res;
}
static void bond_set_multicast_list(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct dev_mc_list *dmi;
write_lock_bh(&bond->lock);
/*
* Do promisc before checking multicast_mode
*/
if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
bond_set_promiscuity(bond, 1);
}
if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
bond_set_promiscuity(bond, -1);
}
/* set allmulti flag to slaves */
if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
bond_set_allmulti(bond, 1);
}
if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
bond_set_allmulti(bond, -1);
}
bond->flags = bond_dev->flags;
/* looking for addresses to add to slaves' mc list */
for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
}
}
/* looking for addresses to delete from slaves' list */
for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
}
}
/* save master's multicast list */
bond_mc_list_destroy(bond);
bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
write_unlock_bh(&bond->lock);
}
/*
* Change the MTU of all of a master's slaves to match the master
*/
static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave, *stop_at;
int res = 0;
int i;
dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
(bond_dev ? bond_dev->name : "None"), new_mtu);
/* Can't hold bond->lock with bh disabled here since
* some base drivers panic. On the other hand we can't
* hold bond->lock without bh disabled because we'll
* deadlock. The only solution is to rely on the fact
* that we're under rtnl_lock here, and the slaves
* list won't change. This doesn't solve the problem
* of setting the slave's MTU while it is
* transmitting, but the assumption is that the base
* driver can handle that.
*
* TODO: figure out a way to safely iterate the slaves
* list, but without holding a lock around the actual
* call to the base driver.
*/
bond_for_each_slave(bond, slave, i) {
dprintk("s %p s->p %p c_m %p\n", slave,
slave->prev, slave->dev->change_mtu);
res = dev_set_mtu(slave->dev, new_mtu);
if (res) {
/* If we failed to set the slave's mtu to the new value
* we must abort the operation even in ACTIVE_BACKUP
* mode, because if we allow the backup slaves to have
* different mtu values than the active slave we'll
* need to change their mtu when doing a failover. That
* means changing their mtu from timer context, which
* is probably not a good idea.
*/
dprintk("err %d %s\n", res, slave->dev->name);
goto unwind;
}
}
bond_dev->mtu = new_mtu;
return 0;
unwind:
/* unwind from head to the slave that failed */
stop_at = slave;
bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
int tmp_res;
tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
if (tmp_res) {
dprintk("unwind err %d dev %s\n", tmp_res,
slave->dev->name);
}
}
return res;
}
/*
* Change HW address
*
* Note that many devices must be down to change the HW address, and
* downing the master releases all slaves. We can make bonds full of
* bonding devices to test this, however.
*/
static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
{
struct bonding *bond = bond_dev->priv;
struct sockaddr *sa = addr, tmp_sa;
struct slave *slave, *stop_at;
int res = 0;
int i;
dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
if (!is_valid_ether_addr(sa->sa_data)) {
return -EADDRNOTAVAIL;
}
/* Can't hold bond->lock with bh disabled here since
* some base drivers panic. On the other hand we can't
* hold bond->lock without bh disabled because we'll
* deadlock. The only solution is to rely on the fact
* that we're under rtnl_lock here, and the slaves
* list won't change. This doesn't solve the problem
* of setting the slave's hw address while it is
* transmitting, but the assumption is that the base
* driver can handle that.
*
* TODO: figure out a way to safely iterate the slaves
* list, but without holding a lock around the actual
* call to the base driver.
*/
bond_for_each_slave(bond, slave, i) {
dprintk("slave %p %s\n", slave, slave->dev->name);
if (slave->dev->set_mac_address == NULL) {
res = -EOPNOTSUPP;
dprintk("EOPNOTSUPP %s\n", slave->dev->name);
goto unwind;
}
res = dev_set_mac_address(slave->dev, addr);
if (res) {
/* TODO: consider downing the slave
* and retry ?
* User should expect communications
* breakage anyway until ARP finish
* updating, so...
*/
dprintk("err %d %s\n", res, slave->dev->name);
goto unwind;
}
}
/* success */
memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
return 0;
unwind:
memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
tmp_sa.sa_family = bond_dev->type;
/* unwind from head to the slave that failed */
stop_at = slave;
bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
int tmp_res;
tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
if (tmp_res) {
dprintk("unwind err %d dev %s\n", tmp_res,
slave->dev->name);
}
}
return res;
}
static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave, *start_at;
int i;
int res = 1;
read_lock(&bond->lock);
if (!BOND_IS_OK(bond)) {
goto out;
}
read_lock(&bond->curr_slave_lock);
slave = start_at = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
if (!slave) {
goto out;
}
bond_for_each_slave_from(bond, slave, i, start_at) {
if (IS_UP(slave->dev) &&
(slave->link == BOND_LINK_UP) &&
(slave->state == BOND_STATE_ACTIVE)) {
res = bond_dev_queue_xmit(bond, skb, slave->dev);
write_lock(&bond->curr_slave_lock);
bond->curr_active_slave = slave->next;
write_unlock(&bond->curr_slave_lock);
break;
}
}
out:
if (res) {
/* no suitable interface, frame not sent */
dev_kfree_skb(skb);
}
read_unlock(&bond->lock);
return 0;
}
/*
* in active-backup mode, we know that bond->curr_active_slave is always valid if
* the bond has a usable interface.
*/
static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
int res = 1;
/* if we are sending arp packets, try to at least
identify our own ip address */
if (bond->params.arp_interval && !my_ip &&
(skb->protocol == __constant_htons(ETH_P_ARP))) {
char *the_ip = (char *)skb->data +
sizeof(struct ethhdr) +
sizeof(struct arphdr) +
ETH_ALEN;
memcpy(&my_ip, the_ip, 4);
}
read_lock(&bond->lock);
read_lock(&bond->curr_slave_lock);
if (!BOND_IS_OK(bond)) {
goto out;
}
if (bond->curr_active_slave) { /* one usable interface */
res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
}
out:
if (res) {
/* no suitable interface, frame not sent */
dev_kfree_skb(skb);
}
read_unlock(&bond->curr_slave_lock);
read_unlock(&bond->lock);
return 0;
}
/*
* in XOR mode, we determine the output device by performing xor on
* the source and destination hw adresses. If this device is not
* enabled, find the next slave following this xor slave.
*/
static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct ethhdr *data = (struct ethhdr *)skb->data;
struct slave *slave, *start_at;
int slave_no;
int i;
int res = 1;
read_lock(&bond->lock);
if (!BOND_IS_OK(bond)) {
goto out;
}
slave_no = (data->h_dest[5]^bond_dev->dev_addr[5]) % bond->slave_cnt;
bond_for_each_slave(bond, slave, i) {
slave_no--;
if (slave_no < 0) {
break;
}
}
start_at = slave;
bond_for_each_slave_from(bond, slave, i, start_at) {
if (IS_UP(slave->dev) &&
(slave->link == BOND_LINK_UP) &&
(slave->state == BOND_STATE_ACTIVE)) {
res = bond_dev_queue_xmit(bond, skb, slave->dev);
break;
}
}
out:
if (res) {
/* no suitable interface, frame not sent */
dev_kfree_skb(skb);
}
read_unlock(&bond->lock);
return 0;
}
/*
* in broadcast mode, we send everything to all usable interfaces.
*/
static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
struct slave *slave, *start_at;
struct net_device *tx_dev = NULL;
int i;
int res = 1;
read_lock(&bond->lock);
if (!BOND_IS_OK(bond)) {
goto out;
}
read_lock(&bond->curr_slave_lock);
start_at = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
if (!start_at) {
goto out;
}
bond_for_each_slave_from(bond, slave, i, start_at) {
if (IS_UP(slave->dev) &&
(slave->link == BOND_LINK_UP) &&
(slave->state == BOND_STATE_ACTIVE)) {
if (tx_dev) {
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
if (!skb2) {
printk(KERN_ERR DRV_NAME
": Error: bond_xmit_broadcast(): "
"skb_clone() failed\n");
continue;
}
res = bond_dev_queue_xmit(bond, skb2, tx_dev);
if (res) {
dev_kfree_skb(skb2);
continue;
}
}
tx_dev = slave->dev;
}
}
if (tx_dev) {
res = bond_dev_queue_xmit(bond, skb, tx_dev);
}
out:
if (res) {
/* no suitable interface, frame not sent */
dev_kfree_skb(skb);
}
/* frame sent to all suitable interfaces */
read_unlock(&bond->lock);
return 0;
}
/*------------------------- Device initialization ---------------------------*/
/*
* set bond mode specific net device operations
*/
static inline void bond_set_mode_ops(struct net_device *bond_dev, int mode)
{
switch (mode) {
case BOND_MODE_ROUNDROBIN:
bond_dev->hard_start_xmit = bond_xmit_roundrobin;
break;
case BOND_MODE_ACTIVEBACKUP:
bond_dev->hard_start_xmit = bond_xmit_activebackup;
break;
case BOND_MODE_XOR:
bond_dev->hard_start_xmit = bond_xmit_xor;
break;
case BOND_MODE_BROADCAST:
bond_dev->hard_start_xmit = bond_xmit_broadcast;
break;
case BOND_MODE_8023AD:
bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
break;
case BOND_MODE_TLB:
case BOND_MODE_ALB:
bond_dev->hard_start_xmit = bond_alb_xmit;
bond_dev->set_mac_address = bond_alb_set_mac_address;
break;
default:
/* Should never happen, mode already checked */
printk(KERN_ERR DRV_NAME
": Error: Unknown bonding mode %d\n",
mode);
break;
}
}
/*
* Does not allocate but creates a /proc entry.
* Allowed to fail.
*/
static int __init bond_init(struct net_device *bond_dev, struct bond_params *params)
{
struct bonding *bond = bond_dev->priv;
dprintk("Begin bond_init for %s\n", bond_dev->name);
/* initialize rwlocks */
rwlock_init(&bond->lock);
rwlock_init(&bond->curr_slave_lock);
bond->params = *params; /* copy params struct */
/* Initialize pointers */
bond->first_slave = NULL;
bond->curr_active_slave = NULL;
bond->current_arp_slave = NULL;
bond->primary_slave = NULL;
bond->dev = bond_dev;
INIT_LIST_HEAD(&bond->vlan_list);
/* Initialize the device entry points */
bond_dev->open = bond_open;
bond_dev->stop = bond_close;
bond_dev->get_stats = bond_get_stats;
bond_dev->do_ioctl = bond_do_ioctl;
bond_dev->set_multicast_list = bond_set_multicast_list;
bond_dev->change_mtu = bond_change_mtu;
bond_dev->set_mac_address = bond_set_mac_address;
bond_set_mode_ops(bond_dev, bond->params.mode);
bond_dev->destructor = free_netdev;
/* Initialize the device options */
bond_dev->tx_queue_len = 0;
bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
/* At first, we block adding VLANs. That's the only way to
* prevent problems that occur when adding VLANs over an
* empty bond. The block will be removed once non-challenged
* slaves are enslaved.
*/
bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
/* don't acquire bond device's xmit_lock when
* transmitting */
bond_dev->features |= NETIF_F_LLTX;
/* By default, we declare the bond to be fully
* VLAN hardware accelerated capable. Special
* care is taken in the various xmit functions
* when there are slaves that are not hw accel
* capable
*/
bond_dev->vlan_rx_register = bond_vlan_rx_register;
bond_dev->vlan_rx_add_vid = bond_vlan_rx_add_vid;
bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
bond_dev->features |= (NETIF_F_HW_VLAN_TX |
NETIF_F_HW_VLAN_RX |
NETIF_F_HW_VLAN_FILTER);
#ifdef CONFIG_PROC_FS
bond_create_proc_entry(bond);
#endif
list_add_tail(&bond->bond_list, &bond_dev_list);
return 0;
}
/* De-initialize device specific data.
* Caller must hold rtnl_lock.
*/
static inline void bond_deinit(struct net_device *bond_dev)
{
struct bonding *bond = bond_dev->priv;
list_del(&bond->bond_list);
#ifdef CONFIG_PROC_FS
bond_remove_proc_entry(bond);
#endif
}
/* Unregister and free all bond devices.
* Caller must hold rtnl_lock.
*/
static void bond_free_all(void)
{
struct bonding *bond, *nxt;
list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
struct net_device *bond_dev = bond->dev;
unregister_netdevice(bond_dev);
bond_deinit(bond_dev);
}
#ifdef CONFIG_PROC_FS
bond_destroy_proc_dir();
#endif
}
/*------------------------- Module initialization ---------------------------*/
/*
* Convert string input module parms. Accept either the
* number of the mode or its string name.
*/
static inline int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
{
int i;
for (i = 0; tbl[i].modename; i++) {
if ((isdigit(*mode_arg) &&
tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
(strncmp(mode_arg, tbl[i].modename,
strlen(tbl[i].modename)) == 0)) {
return tbl[i].mode;
}
}
return -1;
}
static int bond_check_params(struct bond_params *params)
{
/*
* Convert string parameters.
*/
if (mode) {
bond_mode = bond_parse_parm(mode, bond_mode_tbl);
if (bond_mode == -1) {
printk(KERN_ERR DRV_NAME
": Error: Invalid bonding mode \"%s\"\n",
mode == NULL ? "NULL" : mode);
return -EINVAL;
}
}
if (lacp_rate) {
if (bond_mode != BOND_MODE_8023AD) {
printk(KERN_INFO DRV_NAME
": lacp_rate param is irrelevant in mode %s\n",
bond_mode_name(bond_mode));
} else {
lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
if (lacp_fast == -1) {
printk(KERN_ERR DRV_NAME
": Error: Invalid lacp rate \"%s\"\n",
lacp_rate == NULL ? "NULL" : lacp_rate);
return -EINVAL;
}
}
}
if (max_bonds < 1 || max_bonds > INT_MAX) {
printk(KERN_WARNING DRV_NAME
": Warning: max_bonds (%d) not in range %d-%d, so it "
"was reset to BOND_DEFAULT_MAX_BONDS (%d)",
max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
max_bonds = BOND_DEFAULT_MAX_BONDS;
}
if (miimon < 0) {
printk(KERN_WARNING DRV_NAME
": Warning: miimon module parameter (%d), "
"not in range 0-%d, so it was reset to %d\n",
miimon, INT_MAX, BOND_LINK_MON_INTERV);
miimon = BOND_LINK_MON_INTERV;
}
if (updelay < 0) {
printk(KERN_WARNING DRV_NAME
": Warning: updelay module parameter (%d), "
"not in range 0-%d, so it was reset to 0\n",
updelay, INT_MAX);
updelay = 0;
}
if (downdelay < 0) {
printk(KERN_WARNING DRV_NAME
": Warning: downdelay module parameter (%d), "
"not in range 0-%d, so it was reset to 0\n",
downdelay, INT_MAX);
downdelay = 0;
}
if ((use_carrier != 0) && (use_carrier != 1)) {
printk(KERN_WARNING DRV_NAME
": Warning: use_carrier module parameter (%d), "
"not of valid value (0/1), so it was set to 1\n",
use_carrier);
use_carrier = 1;
}
/* reset values for 802.3ad */
if (bond_mode == BOND_MODE_8023AD) {
if (!miimon) {
printk(KERN_WARNING DRV_NAME
": Warning: miimon must be specified, "
"otherwise bonding will not detect link "
"failure, speed and duplex which are "
"essential for 802.3ad operation\n");
printk(KERN_WARNING "Forcing miimon to 100msec\n");
miimon = 100;
}
}
/* reset values for TLB/ALB */
if ((bond_mode == BOND_MODE_TLB) ||
(bond_mode == BOND_MODE_ALB)) {
if (!miimon) {
printk(KERN_WARNING DRV_NAME
": Warning: miimon must be specified, "
"otherwise bonding will not detect link "
"failure and link speed which are essential "
"for TLB/ALB load balancing\n");
printk(KERN_WARNING "Forcing miimon to 100msec\n");
miimon = 100;
}
}
if (bond_mode == BOND_MODE_ALB) {
printk(KERN_NOTICE DRV_NAME
": In ALB mode you might experience client "
"disconnections upon reconnection of a link if the "
"bonding module updelay parameter (%d msec) is "
"incompatible with the forwarding delay time of the "
"switch\n",
updelay);
}
if (!miimon) {
if (updelay || downdelay) {
/* just warn the user the up/down delay will have
* no effect since miimon is zero...
*/
printk(KERN_WARNING DRV_NAME
": Warning: miimon module parameter not set "
"and updelay (%d) or downdelay (%d) module "
"parameter is set; updelay and downdelay have "
"no effect unless miimon is set\n",
updelay, downdelay);
}
} else {
/* don't allow arp monitoring */
if (arp_interval) {
printk(KERN_WARNING DRV_NAME
": Warning: miimon (%d) and arp_interval (%d) "
"can't be used simultaneously, disabling ARP "
"monitoring\n",
miimon, arp_interval);
arp_interval = 0;
}
if ((updelay % miimon) != 0) {
printk(KERN_WARNING DRV_NAME
": Warning: updelay (%d) is not a multiple "
"of miimon (%d), updelay rounded to %d ms\n",
updelay, miimon, (updelay / miimon) * miimon);
}
updelay /= miimon;
if ((downdelay % miimon) != 0) {
printk(KERN_WARNING DRV_NAME
": Warning: downdelay (%d) is not a multiple "
"of miimon (%d), downdelay rounded to %d ms\n",
downdelay, miimon,
(downdelay / miimon) * miimon);
}
downdelay /= miimon;
}
if (arp_interval < 0) {
printk(KERN_WARNING DRV_NAME
": Warning: arp_interval module parameter (%d) "
", not in range 0-%d, so it was reset to %d\n",
arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
arp_interval = BOND_LINK_ARP_INTERV;
}
for (arp_ip_count = 0;
(arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
arp_ip_count++) {
/* not complete check, but should be good enough to
catch mistakes */
if (!isdigit(arp_ip_target[arp_ip_count][0])) {
printk(KERN_WARNING DRV_NAME
": Warning: bad arp_ip_target module parameter "
"(%s), ARP monitoring will not be performed\n",
arp_ip_target[arp_ip_count]);
arp_interval = 0;
} else {
u32 ip = in_aton(arp_ip_target[arp_ip_count]);
arp_target[arp_ip_count] = ip;
}
}
if (arp_interval && !arp_ip_count) {
/* don't allow arping if no arp_ip_target given... */
printk(KERN_WARNING DRV_NAME
": Warning: arp_interval module parameter (%d) "
"specified without providing an arp_ip_target "
"parameter, arp_interval was reset to 0\n",
arp_interval);
arp_interval = 0;
}
if (miimon) {
printk(KERN_INFO DRV_NAME
": MII link monitoring set to %d ms\n",
miimon);
} else if (arp_interval) {
int i;
printk(KERN_INFO DRV_NAME
": ARP monitoring set to %d ms with %d target(s):",
arp_interval, arp_ip_count);
for (i = 0; i < arp_ip_count; i++)
printk (" %s", arp_ip_target[i]);
printk("\n");
} else {
/* miimon and arp_interval not set, we need one so things
* work as expected, see bonding.txt for details
*/
printk(KERN_WARNING DRV_NAME
": Warning: either miimon or arp_interval and "
"arp_ip_target module parameters must be specified, "
"otherwise bonding will not detect link failures! see "
"bonding.txt for details.\n");
}
if (primary && !USES_PRIMARY(bond_mode)) {
/* currently, using a primary only makes sense
* in active backup, TLB or ALB modes
*/
printk(KERN_WARNING DRV_NAME
": Warning: %s primary device specified but has no "
"effect in %s mode\n",
primary, bond_mode_name(bond_mode));
primary = NULL;
}
/* fill params struct with the proper values */
params->mode = bond_mode;
params->miimon = miimon;
params->arp_interval = arp_interval;
params->updelay = updelay;
params->downdelay = downdelay;
params->use_carrier = use_carrier;
params->lacp_fast = lacp_fast;
params->primary[0] = 0;
if (primary) {
strncpy(params->primary, primary, IFNAMSIZ);
params->primary[IFNAMSIZ - 1] = 0;
}
memcpy(params->arp_targets, arp_target, sizeof(arp_target));
return 0;
}
static int __init bonding_init(void)
{
struct bond_params params;
int i;
int res;
printk(KERN_INFO "%s", version);
res = bond_check_params(¶ms);
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, ¶ms);
if (res < 0) {
free_netdev(bond_dev);
goto out_err;
}
SET_MODULE_OWNER(bond_dev);
res = register_netdevice(bond_dev);
if (res < 0) {
bond_deinit(bond_dev);
free_netdev(bond_dev);
goto out_err;
}
}
rtnl_unlock();
register_netdevice_notifier(&bond_netdev_notifier);
return 0;
out_err:
/* free and unregister all bonds that were successfully added */
bond_free_all();
rtnl_unlock();
return res;
}
static void __exit bonding_exit(void)
{
unregister_netdevice_notifier(&bond_netdev_notifier);
rtnl_lock();
bond_free_all();
rtnl_unlock();
}
module_init(bonding_init);
module_exit(bonding_exit);
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
MODULE_SUPPORTED_DEVICE("most ethernet devices");
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* tab-width: 8
* End:
*/
