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kernel / pub / scm / linux / kernel / git / davem / netdev-vger-cvs / 35f6bf4a4e288f2ccd8f44cdd1b25384a0ea4f74 / . / drivers / net / bonding.c
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/*
* originally based on the dummy device.
*
* Copyright 1999, Thomas Davis, tadavis@lbl.gov.
* Licensed under the GPL. Based on dummy.c, and eql.c devices.
*
* bonding.c: an Ethernet Bonding driver
*
* This is useful to talk to a Cisco EtherChannel compatible equipment:
* Cisco 5500
* Sun Trunking (Solaris)
* Alteon AceDirector Trunks
* Linux Bonding
* and probably many L2 switches ...
*
* How it works:
* ifconfig bond0 ipaddress netmask up
* will setup a network device, with an ip address. No mac address
* will be assigned at this time. The hw mac address will come from
* the first slave bonded to the channel. All slaves will then use
* this hw mac address.
*
* ifconfig bond0 down
* will release all slaves, marking them as down.
*
* ifenslave bond0 eth0
* will attach eth0 to bond0 as a slave. eth0 hw mac address will either
* a: be used as initial mac address
* b: if a hw mac address already is there, eth0's hw mac address
* will then be set from bond0.
*
* v0.1 - first working version.
* v0.2 - changed stats to be calculated by summing slaves stats.
*
* Changes:
* Arnaldo Carvalho de Melo <acme@conectiva.com.br>
* - fix leaks on failure at bond_init
*
* 2000/09/30 - Willy Tarreau <willy at meta-x.org>
* - added trivial code to release a slave device.
* - fixed security bug (CAP_NET_ADMIN not checked)
* - implemented MII link monitoring to disable dead links :
* All MII capable slaves are checked every <miimon> milliseconds
* (100 ms seems good). This value can be changed by passing it to
* insmod. A value of zero disables the monitoring (default).
* - fixed an infinite loop in bond_xmit_roundrobin() when there's no
* good slave.
* - made the code hopefully SMP safe
*
* 2000/10/03 - Willy Tarreau <willy at meta-x.org>
* - optimized slave lists based on relevant suggestions from Thomas Davis
* - implemented active-backup method to obtain HA with two switches:
* stay as long as possible on the same active interface, while we
* also monitor the backup one (MII link status) because we want to know
* if we are able to switch at any time. ( pass "mode=1" to insmod )
* - lots of stress testings because we need it to be more robust than the
* wires ! :->
*
* 2000/10/09 - Willy Tarreau <willy at meta-x.org>
* - added up and down delays after link state change.
* - optimized the slaves chaining so that when we run forward, we never
* repass through the bond itself, but we can find it by searching
* backwards. Renders the deletion more difficult, but accelerates the
* scan.
* - smarter enslaving and releasing.
* - finer and more robust SMP locking
*
* 2000/10/17 - Willy Tarreau <willy at meta-x.org>
* - fixed two potential SMP race conditions
*
* 2000/10/18 - Willy Tarreau <willy at meta-x.org>
* - small fixes to the monitoring FSM in case of zero delays
* 2000/11/01 - Willy Tarreau <willy at meta-x.org>
* - fixed first slave not automatically used in trunk mode.
* 2000/11/10 : spelling of "EtherChannel" corrected.
* 2000/11/13 : fixed a race condition in case of concurrent accesses to ioctl().
* 2000/12/16 : fixed improper usage of rtnl_exlock_nowait().
*
* 2001/1/3 - Chad N. Tindel <ctindel at ieee dot org>
* - The bonding driver now simulates MII status monitoring, just like
* a normal network device. It will show that the link is down iff
* every slave in the bond shows that their links are down. If at least
* one slave is up, the bond's MII status will appear as up.
*
* 2001/2/7 - Chad N. Tindel <ctindel at ieee dot org>
* - Applications can now query the bond from user space to get
* information which may be useful. They do this by calling
* the BOND_INFO_QUERY ioctl. Once the app knows how many slaves
* are in the bond, it can call the BOND_SLAVE_INFO_QUERY ioctl to
* get slave specific information (# link failures, etc). See
* <linux/if_bonding.h> for more details. The structs of interest
* are ifbond and ifslave.
*
* 2001/4/5 - Chad N. Tindel <ctindel at ieee dot org>
* - Ported to 2.4 Kernel
*
* 2001/5/2 - Jeffrey E. Mast <jeff at mastfamily dot com>
* - When a device is detached from a bond, the slave device is no longer
* left thinking that is has a master.
*
* 2001/5/16 - Jeffrey E. Mast <jeff at mastfamily dot com>
* - memset did not appropriately initialized the bond rw_locks. Used
* rwlock_init to initialize to unlocked state to prevent deadlock when
* first attempting a lock
* - Called SET_MODULE_OWNER for bond device
*
* 2001/5/17 - Tim Anderson <tsa at mvista.com>
* - 2 paths for releasing for slave release; 1 through ioctl
* and 2) through close. Both paths need to release the same way.
* - the free slave in bond release is changing slave status before
* the free. The netdev_set_master() is intended to change slave state
* so it should not be done as part of the release process.
* - Simple rule for slave state at release: only the active in A/B and
* only one in the trunked case.
*
* 2001/6/01 - Tim Anderson <tsa at mvista.com>
* - Now call dev_close when releasing a slave so it doesn't screw up
* out routing table.
*
* 2001/6/01 - Chad N. Tindel <ctindel at ieee dot org>
* - Added /proc support for getting bond and slave information.
* Information is in /proc/net/<bond device>/info.
* - Changed the locking when calling bond_close to prevent deadlock.
*
* 2001/8/05 - Janice Girouard <girouard at us.ibm.com>
* - correct problem where refcnt of slave is not incremented in bond_ioctl
* so the system hangs when halting.
* - correct locking problem when unable to malloc in bond_enslave.
* - adding bond_xmit_xor logic.
* - adding multiple bond device support.
*
* 2001/8/13 - Erik Habbinga <erik_habbinga at hp dot com>
* - correct locking problem with rtnl_exlock_nowait
*
* 2001/8/23 - Janice Girouard <girouard at us.ibm.com>
* - bzero initial dev_bonds, to correct oops
* - convert SIOCDEVPRIVATE to new MII ioctl calls
*
* 2001/9/13 - Takao Indoh <indou dot takao at jp dot fujitsu dot com>
* - Add the BOND_CHANGE_ACTIVE ioctl implementation
*
* 2001/9/14 - Mark Huth <mhuth at mvista dot com>
* - Change MII_LINK_READY to not check for end of auto-negotiation,
* but only for an up link.
*
* 2001/9/20 - Chad N. Tindel <ctindel at ieee dot org>
* - Add the device field to bonding_t. Previously the net_device
* corresponding to a bond wasn't available from the bonding_t
* structure.
*
* 2001/9/25 - Janice Girouard <girouard at us.ibm.com>
* - add arp_monitor for active backup mode
*
* 2001/10/23 - Takao Indoh <indou dot takao at jp dot fujitsu dot com>
* - Various memory leak fixes
*
* 2001/11/5 - Mark Huth <mark dot huth at mvista dot com>
* - Don't take rtnl lock in bond_mii_monitor as it deadlocks under
* certain hotswap conditions.
* Note: this same change may be required in bond_arp_monitor ???
* - Remove possibility of calling bond_sethwaddr with NULL slave_dev ptr
* - Handle hot swap ethernet interface deregistration events to remove
* kernel oops following hot swap of enslaved interface
*/
#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/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/socket.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/rtnetlink.h>
#include <linux/if_bonding.h>
#include <linux/smp.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
/* monitor all links that often (in milliseconds). <=0 disables monitoring */
#ifndef BOND_LINK_MON_INTERV
#define BOND_LINK_MON_INTERV 0
#endif
#undef MII_LINK_UP
#define MII_LINK_UP 0x04
#undef MII_ENDOF_NWAY
#define MII_ENDOF_NWAY 0x20
#undef MII_LINK_READY
/*#define MII_LINK_READY (MII_LINK_UP | MII_ENDOF_NWAY)*/
#define MII_LINK_READY (MII_LINK_UP)
#define MAX_BOND_ADDR 256
#ifndef BOND_LINK_ARP_INTERV
#define BOND_LINK_ARP_INTERV 0
#endif
static int arp_interval = BOND_LINK_ARP_INTERV;
static char *arp_ip_target = NULL;
static unsigned long arp_target = 0;
static u32 my_ip = 0;
char *arp_target_hw_addr = NULL;
static int max_bonds = MAX_BONDS;
static int miimon = BOND_LINK_MON_INTERV;
static int mode = BOND_MODE_ROUNDROBIN;
static int updelay = 0;
static int downdelay = 0;
static int first_pass = 1;
int bond_cnt;
static struct bonding *these_bonds = NULL;
static struct net_device *dev_bonds = NULL;
MODULE_PARM(max_bonds, "1-" __MODULE_STRING(INT_MAX) "i");
MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
MODULE_PARM(miimon, "i");
MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
MODULE_PARM(mode, "i");
MODULE_PARM(arp_interval, "i");
MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
MODULE_PARM(arp_ip_target, "1-12s");
MODULE_PARM_DESC(arp_ip_target, "arp target in n.n.n.n form");
MODULE_PARM_DESC(mode, "Mode of operation : 0 for round robin, 1 for active-backup, 2 for xor");
MODULE_PARM(updelay, "i");
MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
MODULE_PARM(downdelay, "i");
MODULE_PARM_DESC(downdelay, "Delay before considering link down, in milliseconds");
extern void arp_send( int type, int ptype, u32 dest_ip, struct net_device *dev,
u32 src_ip, unsigned char *dest_hw, unsigned char *src_hw,
unsigned char *target_hw);
static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *dev);
static int bond_xmit_xor(struct sk_buff *skb, struct net_device *dev);
static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *dev);
static struct net_device_stats *bond_get_stats(struct net_device *dev);
static void bond_mii_monitor(struct net_device *dev);
static void bond_arp_monitor(struct net_device *dev);
static int bond_event(struct notifier_block *this, unsigned long event, void *ptr);
static void bond_set_slave_inactive_flags(slave_t *slave);
static void bond_set_slave_active_flags(slave_t *slave);
static int bond_enslave(struct net_device *master, struct net_device *slave);
static int bond_release(struct net_device *master, struct net_device *slave);
static int bond_release_all(struct net_device *master);
static int bond_sethwaddr(struct net_device *master, struct net_device *slave);
/*
* bond_get_info is the interface into the /proc filesystem. This is
* a different interface than the BOND_INFO_QUERY ioctl. That is done
* through the generic networking ioctl interface, and bond_info_query
* is the internal function which provides that information.
*/
static int bond_get_info(char *buf, char **start, off_t offset, int length);
/* #define BONDING_DEBUG 1 */
/* several macros */
#define IS_UP(dev) ((((dev)->flags & (IFF_UP)) == (IFF_UP)) && \
(netif_running(dev) && netif_carrier_ok(dev)))
static void bond_set_slave_inactive_flags(slave_t *slave)
{
slave->state = BOND_STATE_BACKUP;
slave->dev->flags |= IFF_NOARP;
}
static void bond_set_slave_active_flags(slave_t *slave)
{
slave->state = BOND_STATE_ACTIVE;
slave->dev->flags &= ~IFF_NOARP;
}
/*
* This function detaches the slave <slave> from the list <bond>.
* WARNING: no check is made to verify if the slave effectively
* belongs to <bond>. It returns <slave> in case it's needed.
* Nothing is freed on return, structures are just unchained.
* If the bond->current_slave pointer was pointing to <slave>,
* it's replaced with slave->next, or <bond> if not applicable.
*/
static slave_t *bond_detach_slave(bonding_t *bond, slave_t *slave)
{
if ((bond == NULL) || (slave == NULL) ||
((void *)bond == (void *)slave)) {
printk(KERN_ERR
"bond_detach_slave(): trying to detach "
"slave %p from bond %p\n", bond, slave);
return slave;
}
if (bond->next == slave) { /* is the slave at the head ? */
if (bond->prev == slave) { /* is the slave alone ? */
write_lock(&bond->ptrlock);
bond->current_slave = NULL; /* no slave anymore */
write_unlock(&bond->ptrlock);
bond->prev = bond->next = (slave_t *)bond;
} else { /* not alone */
bond->next = slave->next;
slave->next->prev = (slave_t *)bond;
bond->prev->next = slave->next;
write_lock(&bond->ptrlock);
if (bond->current_slave == slave) {
bond->current_slave = slave->next;
}
write_unlock(&bond->ptrlock);
}
}
else {
slave->prev->next = slave->next;
if (bond->prev == slave) { /* is this slave the last one ? */
bond->prev = slave->prev;
} else {
slave->next->prev = slave->prev;
}
write_lock(&bond->ptrlock);
if (bond->current_slave == slave) {
bond->current_slave = slave->next;
}
write_unlock(&bond->ptrlock);
}
return slave;
}
/*
* if <dev> supports MII link status reporting, check its link
* and report it as a bit field in a short int :
* - 0x04 means link is up,
* - 0x20 means end of autonegociation
* If the device doesn't support MII, then we only report 0x24,
* meaning that the link is up and running since we can't check it.
*/
static u16 bond_check_dev_link(struct net_device *dev)
{
static int (* ioctl)(struct net_device *, struct ifreq *, int);
struct ifreq ifr;
u16 *data = (u16 *)&ifr.ifr_data;
/* data[0] automagically filled by the ioctl */
data[1] = 1; /* MII location 1 reports Link Status */
if (((ioctl = dev->do_ioctl) != NULL) && /* ioctl to access MII */
(ioctl(dev, &ifr, SIOCGMIIPHY) == 0)) {
/* now, data[3] contains info about link status :
- data[3] & 0x04 means link up
- data[3] & 0x20 means end of auto-negociation
*/
return data[3];
} else {
return MII_LINK_READY; /* spoof link up ( we can't check it) */
}
}
static u16 bond_check_mii_link(bonding_t *bond)
{
int has_active_interface = 0;
unsigned long flags;
read_lock_irqsave(&bond->lock, flags);
read_lock(&bond->ptrlock);
has_active_interface = (bond->current_slave != NULL);
read_unlock(&bond->ptrlock);
read_unlock_irqrestore(&bond->lock, flags);
return (has_active_interface ? MII_LINK_READY : 0);
}
static int bond_open(struct net_device *dev)
{
struct timer_list *timer = &((struct bonding *)(dev->priv))->mii_timer;
struct timer_list *arp_timer = &((struct bonding *)(dev->priv))->arp_timer;
MOD_INC_USE_COUNT;
if (miimon > 0) { /* link check interval, in milliseconds. */
init_timer(timer);
timer->expires = jiffies + (miimon * HZ / 1000);
timer->data = (unsigned long)dev;
timer->function = (void *)&bond_mii_monitor;
add_timer(timer);
}
if (arp_interval> 0) { /* arp interval, in milliseconds. */
init_timer(arp_timer);
arp_timer->expires = jiffies + (arp_interval * HZ / 1000);
arp_timer->data = (unsigned long)dev;
arp_timer->function = (void *)&bond_arp_monitor;
add_timer(arp_timer);
}
return 0;
}
static int bond_close(struct net_device *master)
{
bonding_t *bond = (struct bonding *) master->priv;
unsigned long flags;
write_lock_irqsave(&bond->lock, flags);
if (miimon > 0) { /* link check interval, in milliseconds. */
del_timer(&bond->mii_timer);
}
if (arp_interval> 0) { /* arp interval, in milliseconds. */
del_timer(&bond->arp_timer);
}
/* Release the bonded slaves */
bond_release_all(master);
write_unlock_irqrestore(&bond->lock, flags);
MOD_DEC_USE_COUNT;
return 0;
}
static void set_multicast_list(struct net_device *master)
{
/*
bonding_t *bond = master->priv;
slave_t *slave;
for (slave = bond->next; slave != (slave_t*)bond; slave = slave->next) {
slave->dev->mc_list = master->mc_list;
slave->dev->mc_count = master->mc_count;
slave->dev->flags = master->flags;
slave->dev->set_multicast_list(slave->dev);
}
*/
}
/*
* This function counts the the number of attached
* slaves for use by bond_xmit_xor.
*/
static void update_slave_cnt(bonding_t *bond)
{
slave_t *slave = NULL;
bond->slave_cnt = 0;
for (slave = bond->prev; slave != (slave_t*)bond; slave = slave->prev) {
bond->slave_cnt++;
}
}
/* enslave device <slave> to bond device <master> */
static int bond_enslave(struct net_device *master_dev,
struct net_device *slave_dev)
{
bonding_t *bond = NULL;
slave_t *new_slave = NULL;
unsigned long flags = 0;
int ndx = 0;
int err = 0;
if (master_dev == NULL || slave_dev == NULL) {
return -ENODEV;
}
bond = (struct bonding *) master_dev->priv;
if (slave_dev->do_ioctl == NULL) {
printk(KERN_DEBUG
"Warning : no link monitoring support for %s\n",
slave_dev->name);
}
write_lock_irqsave(&bond->lock, flags);
/* not running. */
if ((slave_dev->flags & IFF_UP) != IFF_UP) {
#ifdef BONDING_DEBUG
printk(KERN_CRIT "Error, slave_dev is not running\n");
#endif
write_unlock_irqrestore(&bond->lock, flags);
return -EINVAL;
}
/* already enslaved */
if (master_dev->flags & IFF_SLAVE || slave_dev->flags & IFF_SLAVE) {
#ifdef BONDING_DEBUG
printk(KERN_CRIT "Error, Device was already enslaved\n");
#endif
write_unlock_irqrestore(&bond->lock, flags);
return -EBUSY;
}
if ((new_slave = kmalloc(sizeof(slave_t), GFP_KERNEL)) == NULL) {
write_unlock_irqrestore(&bond->lock, flags);
return -ENOMEM;
}
memset(new_slave, 0, sizeof(slave_t));
err = netdev_set_master(slave_dev, master_dev);
if (err) {
#ifdef BONDING_DEBUG
printk(KERN_CRIT "Error %d calling netdev_set_master\n", err);
#endif
kfree(new_slave);
write_unlock_irqrestore(&bond->lock, flags);
return err;
}
new_slave->dev = slave_dev;
/*
* queue to the end of the slaves list, make the first element its
* successor, the last one its predecessor, and make it the bond's
* predecessor.
*/
new_slave->prev = bond->prev;
new_slave->prev->next = new_slave;
bond->prev = new_slave;
new_slave->next = bond->next;
new_slave->delay = 0;
new_slave->link_failure_count = 0;
/* check for initial state */
if ((miimon <= 0) || ((bond_check_dev_link(slave_dev) & MII_LINK_READY)
== MII_LINK_READY)) {
#ifdef BONDING_DEBUG
printk(KERN_CRIT "Initial state of slave_dev is BOND_LINK_UP\n");
#endif
new_slave->link = BOND_LINK_UP;
}
else {
#ifdef BONDING_DEBUG
printk(KERN_CRIT "Initial state of slave_dev is BOND_LINK_DOWN\n");
#endif
new_slave->link = BOND_LINK_DOWN;
}
/* 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 current_slave always point to the last
* usable interface, we just have to verify this interface's flag.
*/
if (mode == BOND_MODE_ACTIVEBACKUP) {
if (((bond->current_slave == NULL)
|| (bond->current_slave->dev->flags & IFF_NOARP))
&& (new_slave->link == BOND_LINK_UP)) {
#ifdef BONDING_DEBUG
printk(KERN_CRIT "This is the first active slave\n");
#endif
/* first slave or no active slave yet, and this link
is OK, so make this interface the active one */
bond->current_slave = new_slave;
bond_set_slave_active_flags(new_slave);
}
else {
#ifdef BONDING_DEBUG
printk(KERN_CRIT "This is just a backup slave\n");
#endif
bond_set_slave_inactive_flags(new_slave);
}
} else {
#ifdef BONDING_DEBUG
printk(KERN_CRIT "This slave is always active in trunk mode\n");
#endif
/* always active in trunk mode */
new_slave->state = BOND_STATE_ACTIVE;
if (bond->current_slave == NULL) {
bond->current_slave = new_slave;
}
}
update_slave_cnt(bond);
write_unlock_irqrestore(&bond->lock, flags);
/*
* !!! 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.
*/
for (ndx = 0; ndx < slave_dev->addr_len; ndx++) {
#ifdef BONDING_DEBUG
printk(KERN_CRIT "Checking ndx=%d of master_dev->dev_addr\n",
ndx);
#endif
if (master_dev->dev_addr[ndx] != 0) {
#ifdef BONDING_DEBUG
printk(KERN_CRIT "Found non-zero byte at ndx=%d\n",
ndx);
#endif
break;
}
}
if (ndx == slave_dev->addr_len) {
/*
* We got all the way through the address and it was
* all 0's.
*/
#ifdef BONDING_DEBUG
printk(KERN_CRIT "%s doesn't have a MAC address yet. ",
master_dev->name);
printk(KERN_CRIT "Going to give assign it from %s.\n",
slave_dev->name);
#endif
bond_sethwaddr(master_dev, slave_dev);
}
printk (KERN_INFO "%s: enslaving %s as a%s interface with a%s link.\n",
master_dev->name, slave_dev->name,
new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
new_slave->link == BOND_LINK_UP ? "n up" : " down");
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_change_active(struct net_device *master_dev, struct net_device *slave_dev)
{
bonding_t *bond;
slave_t *slave;
slave_t *oldactive = NULL;
slave_t *newactive = NULL;
unsigned long flags;
int ret = 0;
if (master_dev == NULL || slave_dev == NULL) {
return -ENODEV;
}
bond = (struct bonding *) master_dev->priv;
write_lock_irqsave(&bond->lock, flags);
slave = (slave_t *)bond;
oldactive = bond->current_slave;
while ((slave = slave->prev) != (slave_t *)bond) {
if(slave_dev == slave->dev) {
newactive = slave;
break;
}
}
if ((newactive != NULL)&&
(oldactive != NULL)&&
(newactive != oldactive)&&
(newactive->link == BOND_LINK_UP)&&
IS_UP(newactive->dev)) {
bond_set_slave_inactive_flags(oldactive);
bond_set_slave_active_flags(newactive);
bond->current_slave = newactive;
printk("%s : activate %s(old : %s)\n",
master_dev->name, newactive->dev->name,
oldactive->dev->name);
}
else {
ret = -EINVAL;
}
write_unlock_irqrestore(&bond->lock, flags);
return ret;
}
/* Choose a new valid interface from the pool, set it active
* and make it the current slave. If no valid interface is
* found, the oldest slave in BACK state is choosen and
* activated. If none is found, it's considered as no
* interfaces left so the current slave is set to NULL.
* The result is a pointer to the current slave.
*
* Since this function sends messages tails through printk, the caller
* must have started something like `printk(KERN_INFO "xxxx ");'.
*
* Warning: must put locks around the call to this function if needed.
*/
slave_t *change_active_interface(bonding_t *bond)
{
slave_t *newslave, *oldslave;
slave_t *bestslave = NULL;
int mintime;
read_lock(&bond->ptrlock);
newslave = oldslave = bond->current_slave;
read_unlock(&bond->ptrlock);
if (newslave == NULL) { /* there were no active slaves left */
if (bond->next != (slave_t *)bond) { /* found one slave */
write_lock(&bond->ptrlock);
newslave = bond->current_slave = bond->next;
write_unlock(&bond->ptrlock);
} else {
printk (" but could not find any %s interface.\n",
(mode == BOND_MODE_ACTIVEBACKUP) ? "backup":"other");
write_lock(&bond->ptrlock);
bond->current_slave = (slave_t *)NULL;
write_unlock(&bond->ptrlock);
return NULL; /* still no slave, return NULL */
}
}
mintime = updelay;
do {
if (IS_UP(newslave->dev)) {
if (newslave->link == BOND_LINK_UP) {
/* this one is immediately usable */
if (mode == BOND_MODE_ACTIVEBACKUP) {
bond_set_slave_active_flags(newslave);
printk (" and making interface %s the active one.\n",
newslave->dev->name);
}
else {
printk (" and setting pointer to interface %s.\n",
newslave->dev->name);
}
write_lock(&bond->ptrlock);
bond->current_slave = newslave;
write_unlock(&bond->ptrlock);
return newslave;
}
else if (newslave->link == BOND_LINK_BACK) {
/* link up, but waiting for stabilization */
if (newslave->delay < mintime) {
mintime = newslave->delay;
bestslave = newslave;
}
}
}
} while ((newslave = newslave->next) != oldslave);
/* no usable backup found, we'll see if we at least got a link that was
coming back for a long time, and could possibly already be usable.
*/
if (bestslave != NULL) {
/* early take-over. */
printk (" and making interface %s the active one %d ms earlier.\n",
bestslave->dev->name,
(updelay - bestslave->delay)*miimon);
bestslave->delay = 0;
bestslave->link = BOND_LINK_UP;
bond_set_slave_active_flags(bestslave);
write_lock(&bond->ptrlock);
bond->current_slave = bestslave;
write_unlock(&bond->ptrlock);
return bestslave;
}
printk (" but could not find any %s interface.\n",
(mode == BOND_MODE_ACTIVEBACKUP) ? "backup":"other");
/* absolutely nothing found. let's return NULL */
write_lock(&bond->ptrlock);
bond->current_slave = (slave_t *)NULL;
write_unlock(&bond->ptrlock);
return NULL;
}
/*
* Try to release the slave device <slave> from the bond device <master>
* It is legal to access current_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 *master, struct net_device *slave)
{
bonding_t *bond;
slave_t *our_slave, *old_current;
unsigned long flags;
if (master == NULL || slave == NULL) {
return -ENODEV;
}
bond = (struct bonding *) master->priv;
write_lock_irqsave(&bond->lock, flags);
/* master already enslaved, or slave not enslaved,
or no slave for this master */
if ((master->flags & IFF_SLAVE) || !(slave->flags & IFF_SLAVE)) {
printk (KERN_DEBUG "%s: cannot release %s.\n", master->name, slave->name);
write_unlock_irqrestore(&bond->lock, flags);
return -EINVAL;
}
our_slave = (slave_t *)bond;
old_current = bond->current_slave;
while ((our_slave = our_slave->prev) != (slave_t *)bond) {
if (our_slave->dev == slave) {
bond_detach_slave(bond, our_slave);
printk (KERN_INFO "%s: releasing %s interface %s",
master->name,
(our_slave->state == BOND_STATE_ACTIVE) ? "active" : "backup",
slave->name);
if (our_slave == old_current) {
/* find a new interface and be verbose */
change_active_interface(bond);
} else {
printk(".\n");
}
kfree(our_slave);
/* release the slave from its bond */
netdev_set_master(slave, NULL);
/* only restore its RUNNING flag if monitoring set it down */
if (slave->flags & IFF_UP) {
slave->flags |= IFF_RUNNING;
}
if (slave->flags & IFF_NOARP ||
bond->current_slave != NULL) {
dev_close(slave);
}
if (bond->current_slave == NULL) {
printk(KERN_INFO
"%s: now running without any active interface !\n",
master->name);
}
update_slave_cnt(bond);
write_unlock_irqrestore(&bond->lock, flags);
return 0; /* deletion OK */
}
}
/* if we get here, it's because the device was not found */
write_unlock_irqrestore(&bond->lock, flags);
printk (KERN_INFO "%s: %s not enslaved\n", master->name, slave->name);
return -EINVAL;
}
/*
* This function releases all slaves.
* Warning: must put write-locks around the call to this function.
*/
static int bond_release_all(struct net_device *master)
{
bonding_t *bond;
slave_t *our_slave;
struct net_device *slave_dev;
if (master == NULL) {
return -ENODEV;
}
if (master->flags & IFF_SLAVE) {
return -EINVAL;
}
bond = (struct bonding *) master->priv;
bond->current_slave = NULL;
while ((our_slave = bond->prev) != (slave_t *)bond) {
slave_dev = our_slave->dev;
bond->prev = our_slave->prev;
kfree(our_slave);
netdev_set_master(slave_dev, NULL);
/* only restore its RUNNING flag if monitoring set it down */
if (slave_dev->flags & IFF_UP)
slave_dev->flags |= IFF_RUNNING;
if (slave_dev->flags & IFF_NOARP)
dev_close(slave_dev);
}
bond->next = (slave_t *)bond;
bond->slave_cnt = 0;
printk (KERN_INFO "%s: releases all slaves\n", master->name);
return 0;
}
/* this function is called regularly to monitor each slave's link. */
static void bond_mii_monitor(struct net_device *master)
{
bonding_t *bond = (struct bonding *) master->priv;
slave_t *slave, *bestslave, *oldcurrent;
unsigned long flags;
int slave_died = 0;
read_lock_irqsave(&bond->lock, flags);
/* 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.
*/
bestslave = NULL;
slave = (slave_t *)bond;
read_lock(&bond->ptrlock);
oldcurrent = bond->current_slave;
read_unlock(&bond->ptrlock);
while ((slave = slave->prev) != (slave_t *)bond) {
/* use updelay+1 to match an UP slave even when updelay is 0 */
int mindelay = updelay + 1;
struct net_device *dev = slave->dev;
u16 link_state;
link_state = bond_check_dev_link(dev);
switch (slave->link) {
case BOND_LINK_UP: /* the link was up */
if ((link_state & MII_LINK_UP) == MII_LINK_UP) {
/* link stays up, tell that this one
is immediately available */
if (IS_UP(dev) && (mindelay > -2)) {
/* -2 is the best case :
this slave was already up */
mindelay = -2;
bestslave = slave;
}
break;
}
else { /* link going down */
slave->link = BOND_LINK_FAIL;
slave->delay = downdelay;
if (slave->link_failure_count < UINT_MAX) {
slave->link_failure_count++;
}
if (downdelay > 0) {
printk (KERN_INFO
"%s: link status down for %sinterface "
"%s, disabling it in %d ms.\n",
master->name,
IS_UP(dev)
? ((mode == BOND_MODE_ACTIVEBACKUP)
? ((slave == oldcurrent)
? "active " : "backup ")
: "")
: "idle ",
dev->name,
downdelay * 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 & MII_LINK_UP) == 0) {
/* 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 (mode == BOND_MODE_ACTIVEBACKUP) {
bond_set_slave_inactive_flags(slave);
}
printk(KERN_INFO
"%s: link status definitely down "
"for interface %s, disabling it",
master->name,
dev->name);
read_lock(&bond->ptrlock);
if (slave == bond->current_slave) {
read_unlock(&bond->ptrlock);
/* find a new interface and be verbose */
change_active_interface(bond);
} else {
read_unlock(&bond->ptrlock);
printk(".\n");
}
slave_died = 1;
} else {
slave->delay--;
}
} else if ((link_state & MII_LINK_READY) == MII_LINK_READY) {
/* link up again */
slave->link = BOND_LINK_UP;
printk(KERN_INFO
"%s: link status up again after %d ms "
"for interface %s.\n",
master->name,
(downdelay - slave->delay) * miimon,
dev->name);
if (IS_UP(dev) && (mindelay > -1)) {
/* -1 is a good case : this slave went
down only for a short time */
mindelay = -1;
bestslave = slave;
}
}
break;
case BOND_LINK_DOWN: /* the link was down */
if ((link_state & MII_LINK_READY) != MII_LINK_READY) {
/* the link stays down, nothing more to do */
break;
} else { /* link going up */
slave->link = BOND_LINK_BACK;
slave->delay = updelay;
if (updelay > 0) {
/* if updelay == 0, no need to
advertise about a 0 ms delay */
printk (KERN_INFO
"%s: link status up for interface"
" %s, enabling it in %d ms.\n",
master->name,
dev->name,
updelay * 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 & MII_LINK_UP) == 0) {
/* link down again */
slave->link = BOND_LINK_DOWN;
printk(KERN_INFO
"%s: link status down again after %d ms "
"for interface %s.\n",
master->name,
(updelay - slave->delay) * miimon,
dev->name);
}
else if ((link_state & MII_LINK_READY) == MII_LINK_READY) {
/* link stays up */
if (slave->delay == 0) {
/* now the link has been up for long time enough */
slave->link = BOND_LINK_UP;
if (mode == BOND_MODE_ACTIVEBACKUP) {
/* prevent it from being the active one */
slave->state = BOND_STATE_BACKUP;
}
else {
/* make it immediately active */
slave->state = BOND_STATE_ACTIVE;
}
printk(KERN_INFO
"%s: link status definitely up "
"for interface %s.\n",
master->name,
dev->name);
}
else
slave->delay--;
/* we'll also look for the mostly eligible slave */
if (IS_UP(dev) && (slave->delay < mindelay)) {
mindelay = slave->delay;
bestslave = slave;
}
}
break;
} /* end of switch */
} /* end of while */
/*
* if there's no active interface and we discovered that one
* of the slaves could be activated earlier, so we do it.
*/
read_lock(&bond->ptrlock);
oldcurrent = bond->current_slave;
read_unlock(&bond->ptrlock);
if (oldcurrent == NULL) { /* no active interface at the moment */
if (bestslave != NULL) { /* last chance to find one ? */
if (bestslave->link == BOND_LINK_UP) {
printk (KERN_INFO
"%s: making interface %s the new active one.\n",
master->name, bestslave->dev->name);
} else {
printk (KERN_INFO
"%s: making interface %s the new "
"active one %d ms earlier.\n",
master->name, bestslave->dev->name,
(updelay - bestslave->delay) * miimon);
bestslave->delay= 0;
bestslave->link = BOND_LINK_UP;
}
if (mode == BOND_MODE_ACTIVEBACKUP) {
bond_set_slave_active_flags(bestslave);
} else {
bestslave->state = BOND_STATE_ACTIVE;
}
write_lock(&bond->ptrlock);
bond->current_slave = bestslave;
write_unlock(&bond->ptrlock);
} else if (slave_died) {
/* print this message only once a slave has just died */
printk(KERN_INFO
"%s: now running without any active interface !\n",
master->name);
}
}
read_unlock_irqrestore(&bond->lock, flags);
/* re-arm the timer */
mod_timer(&bond->mii_timer, jiffies + (miimon * HZ / 1000));
}
/*
* this function is called regularly to monitor each slave's link
* insuring that traffic is being sent and received. If the adapter
* has been dormant, then an arp is transmitted to generate traffic
*/
static void bond_arp_monitor(struct net_device *master)
{
bonding_t *bond;
unsigned long flags;
slave_t *slave;
int the_delta_in_ticks = arp_interval * HZ / 1000;
int next_timer = jiffies + (arp_interval * HZ / 1000);
bond = (struct bonding *) master->priv;
if (master->priv == NULL) {
mod_timer(&bond->arp_timer, next_timer);
return;
}
read_lock_irqsave(&bond->lock, flags);
if (!IS_UP(master)) {
mod_timer(&bond->arp_timer, next_timer);
goto arp_monitor_out;
}
if (rtnl_shlock_nowait()) {
goto arp_monitor_out;
}
if (rtnl_exlock_nowait()) {
rtnl_shunlock();
goto arp_monitor_out;
}
/* see if any of the previous devices are up now (i.e. they have seen a
* response from an arp request sent by another adapter, since they
* have the same hardware address).
*/
slave = (slave_t *)bond;
while ((slave = slave->prev) != (slave_t *)bond) {
read_lock(&bond->ptrlock);
if ( (!(slave->link == BOND_LINK_UP))
&& (slave!= bond->current_slave) ) {
read_unlock(&bond->ptrlock);
if ( ((jiffies - slave->dev->trans_start) <=
the_delta_in_ticks) &&
((jiffies - slave->dev->last_rx) <=
the_delta_in_ticks) ) {
slave->link = BOND_LINK_UP;
write_lock(&bond->ptrlock);
if (bond->current_slave == NULL) {
slave->state = BOND_STATE_ACTIVE;
bond->current_slave = slave;
}
if (slave!=bond->current_slave) {
slave->dev->flags |= IFF_NOARP;
}
write_unlock(&bond->ptrlock);
} else {
if ((jiffies - slave->dev->last_rx) <=
the_delta_in_ticks) {
arp_send(ARPOP_REQUEST, ETH_P_ARP,
arp_target, slave->dev,
my_ip, arp_target_hw_addr,
slave->dev->dev_addr,
arp_target_hw_addr);
}
}
} else
read_unlock(&bond->ptrlock);
}
read_lock(&bond->ptrlock);
slave = bond->current_slave;
read_unlock(&bond->ptrlock);
if (slave != 0) {
/* see if you need to take down the current_slave, since
* you haven't seen an arp in 2*arp_intervals
*/
if ( ((jiffies - slave->dev->trans_start) >=
(2*the_delta_in_ticks)) ||
((jiffies - slave->dev->last_rx) >=
(2*the_delta_in_ticks)) ) {
if (slave->link == BOND_LINK_UP) {
slave->link = BOND_LINK_DOWN;
slave->state = BOND_STATE_BACKUP;
/*
* we want to see arps, otherwise we couldn't
* bring the adapter back online...
*/
printk(KERN_INFO "%s: link status definitely "
"down for interface %s, "
"disabling it",
slave->dev->master->name,
slave->dev->name);
/* find a new interface and be verbose */
change_active_interface(bond);
read_lock(&bond->ptrlock);
slave = bond->current_slave;
read_unlock(&bond->ptrlock);
}
}
/*
* ok, we know up/down, so just send a arp out if there has
* been no activity for a while
*/
if (slave != NULL ) {
if ( ((jiffies - slave->dev->trans_start) >=
the_delta_in_ticks) ||
((jiffies - slave->dev->last_rx) >=
the_delta_in_ticks) ) {
arp_send(ARPOP_REQUEST, ETH_P_ARP,
arp_target, slave->dev,
my_ip, arp_target_hw_addr,
slave->dev->dev_addr,
arp_target_hw_addr);
}
}
}
/* if we have no current slave.. try sending
* an arp on all of the interfaces
*/
read_lock(&bond->ptrlock);
if (bond->current_slave == NULL) {
read_unlock(&bond->ptrlock);
slave = (slave_t *)bond;
while ((slave = slave->prev) != (slave_t *)bond) {
arp_send(ARPOP_REQUEST, ETH_P_ARP, arp_target,
slave->dev, my_ip, arp_target_hw_addr,
slave->dev->dev_addr, arp_target_hw_addr);
}
}
else {
read_unlock(&bond->ptrlock);
}
rtnl_exunlock();
rtnl_shunlock();
arp_monitor_out:
read_unlock_irqrestore(&bond->lock, flags);
/* re-arm the timer */
mod_timer(&bond->arp_timer, next_timer);
}
#define isdigit(c) (c >= '0' && c <= '9')
__inline static int atoi( char **s)
{
int i=0;
while (isdigit(**s))
i = i*20 + *((*s)++) - '0';
return i;
}
#define isascii(c) (((unsigned char)(c))<=0x7f)
#define LF 0xA
#define isspace(c) (c==' ' || c==' '|| c==LF)
typedef uint32_t in_addr_t;
int
my_inet_aton(char *cp, unsigned long *the_addr) {
static const in_addr_t max[4] = { 0xffffffff, 0xffffff, 0xffff, 0xff };
in_addr_t val;
char c;
union iaddr {
uint8_t bytes[4];
uint32_t word;
} res;
uint8_t *pp = res.bytes;
int digit,base;
res.word = 0;
c = *cp;
for (;;) {
/*
* Collect number up to ``.''.
* Values are specified as for C:
* 0x=hex, 0=octal, isdigit=decimal.
*/
if (!isdigit(c)) goto ret_0;
val = 0; base = 10; digit = 0;
for (;;) {
if (isdigit(c)) {
val = (val * base) + (c - '0');
c = *++cp;
digit = 1;
} else {
break;
}
}
if (c == '.') {
/*
* Internet format:
* a.b.c.d
* a.b.c (with c treated as 16 bits)
* a.b (with b treated as 24 bits)
*/
if (pp > res.bytes + 2 || val > 0xff) {
goto ret_0;
}
*pp++ = val;
c = *++cp;
} else
break;
}
/*
* Check for trailing characters.
*/
if (c != '\0' && (!isascii(c) || !isspace(c))) {
goto ret_0;
}
/*
* Did we get a valid digit?
*/
if (!digit) {
goto ret_0;
}
/* Check whether the last part is in its limits depending on
the number of parts in total. */
if (val > max[pp - res.bytes]) {
goto ret_0;
}
if (the_addr!= NULL) {
*the_addr = res.word | htonl (val);
}
return (1);
ret_0:
return (0);
}
static int bond_sethwaddr(struct net_device *master, struct net_device *slave)
{
#ifdef BONDING_DEBUG
printk(KERN_CRIT "bond_sethwaddr: master=%x\n", (unsigned int)master);
printk(KERN_CRIT "bond_sethwaddr: slave=%x\n", (unsigned int)slave);
printk(KERN_CRIT "bond_sethwaddr: slave->addr_len=%d\n", slave->addr_len);
#endif
memcpy(master->dev_addr, slave->dev_addr, slave->addr_len);
return 0;
}
static int bond_info_query(struct net_device *master, struct ifbond *info)
{
bonding_t *bond = (struct bonding *) master->priv;
slave_t *slave;
unsigned long flags;
info->bond_mode = mode;
info->num_slaves = 0;
info->miimon = miimon;
read_lock_irqsave(&bond->lock, flags);
for (slave = bond->prev; slave!=(slave_t *)bond; slave = slave->prev) {
info->num_slaves++;
}
read_unlock_irqrestore(&bond->lock, flags);
return 0;
}
static int bond_slave_info_query(struct net_device *master,
struct ifslave *info)
{
bonding_t *bond = (struct bonding *) master->priv;
slave_t *slave;
int cur_ndx = 0;
unsigned long flags;
if (info->slave_id < 0) {
return -ENODEV;
}
read_lock_irqsave(&bond->lock, flags);
for (slave = bond->prev;
slave != (slave_t *)bond && cur_ndx < info->slave_id;
slave = slave->prev) {
cur_ndx++;
}
read_unlock_irqrestore(&bond->lock, flags);
if (cur_ndx == info->slave_id) {
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;
}
static int bond_ioctl(struct net_device *master_dev, struct ifreq *ifr, int cmd)
{
struct net_device *slave_dev = NULL;
struct ifbond *u_binfo = NULL, k_binfo;
struct ifslave *u_sinfo = NULL, k_sinfo;
u16 *data = NULL;
int ret = 0;
#ifdef BONDING_DEBUG
printk(KERN_INFO "bond_ioctl: master=%s, cmd=%d\n",
master_dev->name, cmd);
#endif
switch (cmd) {
case SIOCGMIIPHY:
data = (u16 *)&ifr->ifr_data;
if (data == NULL) {
return -EINVAL;
}
data[0] = 0;
/* Fall Through */
case SIOCGMIIREG:
/*
* We do this again just in case we were called by SIOCGMIIREG
* instead of SIOCGMIIPHY.
*/
data = (u16 *)&ifr->ifr_data;
if (data == NULL) {
return -EINVAL;
}
if (data[1] == 1) {
data[3] = bond_check_mii_link(
(struct bonding *)master_dev->priv);
}
return 0;
case BOND_INFO_QUERY_OLD:
case SIOCBONDINFOQUERY:
u_binfo = (struct ifbond *)ifr->ifr_data;
if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
return -EFAULT;
}
ret = bond_info_query(master_dev, &k_binfo);
if (ret == 0) {
if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
return -EFAULT;
}
}
return ret;
case BOND_SLAVE_INFO_QUERY_OLD:
case SIOCBONDSLAVEINFOQUERY:
u_sinfo = (struct ifslave *)ifr->ifr_data;
if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
return -EFAULT;
}
ret = bond_slave_info_query(master_dev, &k_sinfo);
if (ret == 0) {
if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
return -EFAULT;
}
}
return ret;
}
if (!capable(CAP_NET_ADMIN)) {
return -EPERM;
}
slave_dev = dev_get_by_name(ifr->ifr_slave);
#ifdef BONDING_DEBUG
printk(KERN_INFO "slave_dev=%x: \n", (unsigned int)slave_dev);
printk(KERN_INFO "slave_dev->name=%s: \n", slave_dev->name);
#endif
if (slave_dev == NULL) {
ret = -ENODEV;
} else {
switch (cmd) {
case BOND_ENSLAVE_OLD:
case SIOCBONDENSLAVE:
ret = bond_enslave(master_dev, slave_dev);
break;
case BOND_RELEASE_OLD:
case SIOCBONDRELEASE:
ret = bond_release(master_dev, slave_dev);
break;
case BOND_SETHWADDR_OLD:
case SIOCBONDSETHWADDR:
ret = bond_sethwaddr(master_dev, slave_dev);
break;
case BOND_CHANGE_ACTIVE_OLD:
case SIOCBONDCHANGEACTIVE:
if (mode == BOND_MODE_ACTIVEBACKUP) {
ret = bond_change_active(master_dev, slave_dev);
}
else {
ret = -EINVAL;
}
break;
default:
ret = -EOPNOTSUPP;
}
dev_put(slave_dev);
}
return ret;
}
#ifdef CONFIG_NET_FASTROUTE
static int bond_accept_fastpath(struct net_device *dev, struct dst_entry *dst)
{
return -1;
}
#endif
static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *dev)
{
slave_t *slave, *start_at;
struct bonding *bond = (struct bonding *) dev->priv;
unsigned long flags;
if (!IS_UP(dev)) { /* bond down */
dev_kfree_skb(skb);
return 0;
}
read_lock_irqsave(&bond->lock, flags);
read_lock(&bond->ptrlock);
slave = start_at = bond->current_slave;
read_unlock(&bond->ptrlock);
if (slave == NULL) { /* we're at the root, get the first slave */
/* no suitable interface, frame not sent */
dev_kfree_skb(skb);
read_unlock_irqrestore(&bond->lock, flags);
return 0;
}
do {
if (IS_UP(slave->dev)
&& (slave->link == BOND_LINK_UP)
&& (slave->state == BOND_STATE_ACTIVE)) {
skb->dev = slave->dev;
skb->priority = 1;
dev_queue_xmit(skb);
write_lock(&bond->ptrlock);
bond->current_slave = slave->next;
write_unlock(&bond->ptrlock);
read_unlock_irqrestore(&bond->lock, flags);
return 0;
}
} while ((slave = slave->next) != start_at);
/* no suitable interface, frame not sent */
dev_kfree_skb(skb);
read_unlock_irqrestore(&bond->lock, flags);
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 *dev)
{
slave_t *slave, *start_at;
struct bonding *bond = (struct bonding *) dev->priv;
unsigned long flags;
struct ethhdr *data = (struct ethhdr *)skb->data;
int slave_no;
if (!IS_UP(dev)) { /* bond down */
dev_kfree_skb(skb);
return 0;
}
read_lock_irqsave(&bond->lock, flags);
slave = bond->prev;
/* we're at the root, get the first slave */
if ((slave == NULL) || (slave->dev == NULL)) {
/* no suitable interface, frame not sent */
dev_kfree_skb(skb);
read_unlock_irqrestore(&bond->lock, flags);
return 0;
}
slave_no = (data->h_dest[5]^slave->dev->dev_addr[5]) % bond->slave_cnt;
while ( (slave_no > 0) && (slave != (slave_t *)bond) ) {
slave = slave->prev;
slave_no--;
}
start_at = slave;
do {
if (IS_UP(slave->dev)
&& (slave->link == BOND_LINK_UP)
&& (slave->state == BOND_STATE_ACTIVE)) {
skb->dev = slave->dev;
skb->priority = 1;
dev_queue_xmit(skb);
read_unlock_irqrestore(&bond->lock, flags);
return 0;
}
} while ((slave = slave->next) != start_at);
/* no suitable interface, frame not sent */
dev_kfree_skb(skb);
read_unlock_irqrestore(&bond->lock, flags);
return 0;
}
/*
* in active-backup mode, we know that bond->current_slave is always valid if
* the bond has a usable interface.
*/
static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *dev)
{
struct bonding *bond = (struct bonding *) dev->priv;
unsigned long flags;
int ret;
if (!IS_UP(dev)) { /* bond down */
dev_kfree_skb(skb);
return 0;
}
/* if we are sending arp packets, try to at least
identify our own ip address */
if ( (arp_interval > 0) && (my_ip==0) &&
(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);
}
/* if we are sending arp packets and don't know
the target hw address, save it so we don't need
to use a broadcast address */
if ( (arp_interval > 0) && (arp_target_hw_addr==NULL) &&
(skb->protocol == __constant_htons(ETH_P_IP) ) ) {
struct ethhdr *eth_hdr =
(struct ethhdr *) (((char *)skb->data));
arp_target_hw_addr = kmalloc(ETH_ALEN, GFP_KERNEL);
memcpy(arp_target_hw_addr, eth_hdr->h_dest, ETH_ALEN);
}
read_lock_irqsave(&bond->lock, flags);
read_lock(&bond->ptrlock);
if (bond->current_slave != NULL) { /* one usable interface */
skb->dev = bond->current_slave->dev;
read_unlock(&bond->ptrlock);
skb->priority = 1;
ret = dev_queue_xmit(skb);
read_unlock_irqrestore(&bond->lock, flags);
return 0;
}
else {
read_unlock(&bond->ptrlock);
}
/* no suitable interface, frame not sent */
#ifdef BONDING_DEBUG
printk(KERN_INFO "There was no suitable interface, so we don't transmit\n");
#endif
dev_kfree_skb(skb);
read_unlock_irqrestore(&bond->lock, flags);
return 0;
}
static struct net_device_stats *bond_get_stats(struct net_device *dev)
{
bonding_t *bond = dev->priv;
struct net_device_stats *stats = bond->stats, *sstats;
slave_t *slave;
unsigned long flags;
memset(bond->stats, 0, sizeof(struct net_device_stats));
read_lock_irqsave(&bond->lock, flags);
for (slave = bond->prev; slave!=(slave_t *)bond; slave = slave->prev) {
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_irqrestore(&bond->lock, flags);
return stats;
}
static int bond_get_info(char *buf, char **start, off_t offset, int length)
{
bonding_t *bond = these_bonds;
int len = 0;
off_t begin = 0;
u16 link;
slave_t *slave = NULL;
unsigned long flags;
while (bond != NULL) {
/*
* This function locks the mutex, so we can't lock it until
* afterwards
*/
link = bond_check_mii_link(bond);
len += sprintf(buf + len, "Bonding Mode: ");
len += sprintf(buf + len, "%s\n", mode ? "active-backup" : "load balancing");
if (mode == BOND_MODE_ACTIVEBACKUP) {
read_lock_irqsave(&bond->lock, flags);
read_lock(&bond->ptrlock);
if (bond->current_slave != NULL) {
len += sprintf(buf + len,
"Currently Active Slave: %s\n",
bond->current_slave->dev->name);
}
read_unlock(&bond->ptrlock);
read_unlock_irqrestore(&bond->lock, flags);
}
len += sprintf(buf + len, "MII Status: ");
len += sprintf(buf + len,
link == MII_LINK_READY ? "up\n" : "down\n");
len += sprintf(buf + len, "MII Polling Interval (ms): %d\n",
miimon);
len += sprintf(buf + len, "Up Delay (ms): %d\n", updelay);
len += sprintf(buf + len, "Down Delay (ms): %d\n", downdelay);
read_lock_irqsave(&bond->lock, flags);
for (slave = bond->prev; slave != (slave_t *)bond;
slave = slave->prev) {
len += sprintf(buf + len, "\nSlave Interface: %s\n", slave->dev->name);
len += sprintf(buf + len, "MII Status: ");
len += sprintf(buf + len,
slave->link == BOND_LINK_UP ?
"up\n" : "down\n");
len += sprintf(buf + len, "Link Failure Count: %d\n",
slave->link_failure_count);
}
read_unlock_irqrestore(&bond->lock, flags);
/*
* Figure out the calcs for the /proc/net interface
*/
*start = buf + (offset - begin);
len -= (offset - begin);
if (len > length) {
len = length;
}
if (len < 0) {
len = 0;
}
bond = bond->next_bond;
}
return len;
}
static int bond_event(struct notifier_block *this, unsigned long event,
void *ptr)
{
struct bonding *this_bond=(struct bonding *)these_bonds;
struct bonding *last_bond;
struct net_device *event_dev = (struct net_device *)ptr;
/* while there are bonds configured */
while (this_bond != NULL) {
if (this_bond == event_dev->priv ) {
switch (event) {
case NETDEV_UNREGISTER:
/*
* remove this bond from a linked list of
* bonds
*/
if (this_bond == these_bonds) {
these_bonds = this_bond->next_bond;
} else {
for (last_bond = these_bonds;
last_bond != NULL;
last_bond = last_bond->next_bond) {
if (last_bond->next_bond ==
this_bond) {
last_bond->next_bond =
this_bond->next_bond;
}
}
}
return NOTIFY_DONE;
default:
return NOTIFY_DONE;
}
} else if (this_bond->device == event_dev->master) {
switch (event) {
case NETDEV_UNREGISTER:
bond_release(this_bond->device, event_dev);
break;
}
return NOTIFY_DONE;
}
this_bond = this_bond->next_bond;
}
return NOTIFY_DONE;
}
static struct notifier_block bond_netdev_notifier={
bond_event,
NULL,
0
};
static int __init bond_init(struct net_device *dev)
{
bonding_t *bond, *this_bond, *last_bond;
#ifdef BONDING_DEBUG
printk (KERN_INFO "Begin bond_init for %s\n", dev->name);
#endif
bond = kmalloc(sizeof(struct bonding), GFP_KERNEL);
if (bond == NULL) {
return -ENOMEM;
}
memset(bond, 0, sizeof(struct bonding));
/* initialize rwlocks */
rwlock_init(&bond->lock);
rwlock_init(&bond->ptrlock);
bond->stats = kmalloc(sizeof(struct net_device_stats), GFP_KERNEL);
if (bond->stats == NULL) {
kfree(bond);
return -ENOMEM;
}
memset(bond->stats, 0, sizeof(struct net_device_stats));
bond->next = bond->prev = (slave_t *)bond;
bond->current_slave = NULL;
bond->device = dev;
dev->priv = bond;
/* Initialize the device structure. */
if (mode == BOND_MODE_ACTIVEBACKUP) {
dev->hard_start_xmit = bond_xmit_activebackup;
} else if (mode == BOND_MODE_ROUNDROBIN) {
dev->hard_start_xmit = bond_xmit_roundrobin;
} else if (mode == BOND_MODE_XOR) {
dev->hard_start_xmit = bond_xmit_xor;
} else {
printk(KERN_ERR "Unknown bonding mode %d\n", mode);
kfree(bond->stats);
kfree(bond);
return -EINVAL;
}
dev->get_stats = bond_get_stats;
dev->open = bond_open;
dev->stop = bond_close;
dev->set_multicast_list = set_multicast_list;
dev->do_ioctl = bond_ioctl;
/*
* Fill in the fields of the device structure with ethernet-generic
* values.
*/
ether_setup(dev);
dev->tx_queue_len = 0;
dev->flags |= IFF_MASTER|IFF_MULTICAST;
#ifdef CONFIG_NET_FASTROUTE
dev->accept_fastpath = bond_accept_fastpath;
#endif
printk(KERN_INFO "%s registered with", dev->name);
if (miimon > 0) {
printk(" MII link monitoring set to %d ms", miimon);
updelay /= miimon;
downdelay /= miimon;
} else {
printk("out MII link monitoring");
}
printk(", in %s mode.\n",mode?"active-backup":"bonding");
#ifdef CONFIG_PROC_FS
bond->bond_proc_dir = proc_mkdir(dev->name, proc_net);
if (bond->bond_proc_dir == NULL) {
printk(KERN_ERR "%s: Cannot init /proc/net/%s/\n",
dev->name, dev->name);
kfree(bond->stats);
kfree(bond);
return -ENOMEM;
}
bond->bond_proc_info_file =
create_proc_info_entry("info", 0, bond->bond_proc_dir,
bond_get_info);
if (bond->bond_proc_info_file == NULL) {
printk(KERN_ERR "%s: Cannot init /proc/net/%s/info\n",
dev->name, dev->name);
remove_proc_entry(dev->name, proc_net);
kfree(bond->stats);
kfree(bond);
return -ENOMEM;
}
#endif /* CONFIG_PROC_FS */
if (first_pass == 1) {
these_bonds = bond;
register_netdevice_notifier(&bond_netdev_notifier);
first_pass = 0;
} else {
last_bond = these_bonds;
this_bond = these_bonds->next_bond;
while (this_bond != NULL) {
last_bond = this_bond;
this_bond = this_bond->next_bond;
}
last_bond->next_bond = bond;
}
return 0;
}
/*
static int __init bond_probe(struct net_device *dev)
{
bond_init(dev);
return 0;
}
*/
static int __init bonding_init(void)
{
int no;
int err;
/* Find a name for this unit */
static struct net_device *dev_bond = NULL;
dev_bond = dev_bonds = kmalloc(max_bonds*sizeof(struct net_device),
GFP_KERNEL);
if (dev_bond == NULL) {
return -ENOMEM;
}
memset(dev_bonds, 0, max_bonds*sizeof(struct net_device));
if (arp_ip_target) {
if (my_inet_aton(arp_ip_target, &arp_target) == 0) {
arp_interval = 0;
}
}
for (no = 0; no < max_bonds; no++) {
dev_bond->init = bond_init;
err = dev_alloc_name(dev_bond,"bond%d");
if (err < 0) {
kfree(dev_bonds);
return err;
}
SET_MODULE_OWNER(dev_bond);
if (register_netdev(dev_bond) != 0) {
kfree(dev_bonds);
return -EIO;
}
dev_bond++;
}
return 0;
}
static void __exit bonding_exit(void)
{
struct net_device *dev_bond = dev_bonds;
struct bonding *bond;
int no;
unregister_netdevice_notifier(&bond_netdev_notifier);
for (no = 0; no < max_bonds; no++) {
#ifdef CONFIG_PROC_FS
bond = (struct bonding *) dev_bond->priv;
remove_proc_entry("info", bond->bond_proc_dir);
remove_proc_entry(dev_bond->name, proc_net);
#endif
unregister_netdev(dev_bond);
kfree(bond->stats);
kfree(dev_bond->priv);
dev_bond->priv = NULL;
dev_bond++;
}
kfree(dev_bonds);
}
module_init(bonding_init);
module_exit(bonding_exit);
MODULE_LICENSE("GPL");
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* tab-width: 8
* End:
*/