bond_main.c 124.8 KB
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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.
 *
 */

//#define BONDING_DEBUG 1

#include <linux/kernel.h>
#include <linux/module.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>
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#include <net/ip.h>
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#include <linux/ip.h>
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#include <linux/tcp.h>
#include <linux/udp.h>
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#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>
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#include <linux/igmp.h>
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#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>
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#include <net/route.h>
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#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;
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static char *xmit_hash_policy = NULL;
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static int arp_interval = BOND_LINK_ARP_INTERV;
static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
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static char *arp_validate = NULL;
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struct bond_params bonding_defaults;
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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);
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MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
			    "in milliseconds");
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module_param(use_carrier, int, 0);
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MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
			      "0 for off, 1 for on (default)");
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module_param(mode, charp, 0);
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MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
		       "1 for active-backup, 2 for balance-xor, "
		       "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
		       "6 for balance-alb");
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module_param(primary, charp, 0);
MODULE_PARM_DESC(primary, "Primary network device to use");
module_param(lacp_rate, charp, 0);
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MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
			    "(slow/fast)");
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module_param(xmit_hash_policy, charp, 0);
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MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
				   ", 1 for layer 3+4");
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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");
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module_param(arp_validate, charp, 0);
MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
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/*----------------------------- Global variables ----------------------------*/

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static const char * const version =
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	DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";

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LIST_HEAD(bond_dev_list);
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#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *bond_proc_dir = NULL;
#endif

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extern struct rw_semaphore bonding_rwsem;
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static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
static int arp_ip_count	= 0;
static int bond_mode	= BOND_MODE_ROUNDROBIN;
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static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
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static int lacp_fast	= 0;
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struct bond_parm_tbl bond_lacp_tbl[] = {
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{	"slow",		AD_LACP_SLOW},
{	"fast",		AD_LACP_FAST},
{	NULL,		-1},
};

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struct bond_parm_tbl bond_mode_tbl[] = {
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{	"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},
};

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struct bond_parm_tbl xmit_hashtype_tbl[] = {
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{	"layer2",		BOND_XMIT_POLICY_LAYER2},
{	"layer3+4",		BOND_XMIT_POLICY_LAYER34},
{	NULL,			-1},
};

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struct bond_parm_tbl arp_validate_tbl[] = {
{	"none",			BOND_ARP_VALIDATE_NONE},
{	"active",		BOND_ARP_VALIDATE_ACTIVE},
{	"backup",		BOND_ARP_VALIDATE_BACKUP},
{	"all",			BOND_ARP_VALIDATE_ALL},
{	NULL,			-1},
};

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/*-------------------------- Forward declarations ---------------------------*/

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static void bond_send_gratuitous_arp(struct bonding *bond);
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/*---------------------------- General routines -----------------------------*/

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static const char *bond_mode_name(int mode)
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{
	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;
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	vlan->vlan_ip = 0;
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	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
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		       ": %s: Error: Failed to add vlan id %d\n",
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		       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.
			 */
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			vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
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			slave_dev->vlan_rx_kill_vid(slave_dev, vid);
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			vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
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		}
	}

	res = bond_del_vlan(bond, vid);
	if (res) {
		printk(KERN_ERR DRV_NAME
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		       ": %s: Error: Failed to remove vlan id %d\n",
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		       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.
		 */
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		vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
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		slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
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		vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
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	}

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 -------------------------------*/

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/*
 * Set the carrier state for the master according to the state of its
 * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 * do special 802.3ad magic.
 *
 * Returns zero if carrier state does not change, nonzero if it does.
 */
static int bond_set_carrier(struct bonding *bond)
{
	struct slave *slave;
	int i;

	if (bond->slave_cnt == 0)
		goto down;

	if (bond->params.mode == BOND_MODE_8023AD)
		return bond_3ad_set_carrier(bond);

	bond_for_each_slave(bond, slave, i) {
		if (slave->link == BOND_LINK_UP) {
			if (!netif_carrier_ok(bond->dev)) {
				netif_carrier_on(bond->dev);
				return 1;
			}
			return 0;
		}
	}

down:
	if (netif_carrier_ok(bond->dev)) {
		netif_carrier_off(bond->dev);
		return 1;
	}
	return 0;
}

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/*
 * 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) {
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		int res;
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		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:
652
	case SPEED_10000:
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		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);
		}
	}
}

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/*
 * Retrieve the list of registered multicast addresses for the bonding
 * device and retransmit an IGMP JOIN request to the current active
 * slave.
 */
static void bond_resend_igmp_join_requests(struct bonding *bond)
{
	struct in_device *in_dev;
	struct ip_mc_list *im;

	rcu_read_lock();
	in_dev = __in_dev_get_rcu(bond->dev);
	if (in_dev) {
		for (im = in_dev->mc_list; im; im = im->next) {
			ip_mc_rejoin_group(im);
		}
	}

	rcu_read_unlock();
}

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/*
 * 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;
	}
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        bond->mc_list = NULL;
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}

/*
 * Copy all the Multicast addresses from src to the bonding device dst
 */
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static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
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			     gfp_t gfp_flag)
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{
	struct dev_mc_list *dmi, *new_dmi;

	for (dmi = mc_list; dmi; dmi = dmi->next) {
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		new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
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		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);
		}
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		bond_resend_igmp_join_requests(bond);
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	}
}

/**
 * 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.
 */
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void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
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{
	struct slave *old_active = bond->curr_active_slave;

	if (old_active == new_active) {
		return;
	}

	if (new_active) {
		if (new_active->link == BOND_LINK_BACK) {
			if (USES_PRIMARY(bond->params.mode)) {
				printk(KERN_INFO DRV_NAME
				       ": %s: making interface %s the new "
				       "active one %d ms earlier.\n",
				       bond->dev->name, new_active->dev->name,
				       (bond->params.updelay - new_active->delay) * bond->params.miimon);
			}

			new_active->delay = 0;
			new_active->link = BOND_LINK_UP;
			new_active->jiffies = jiffies;

			if (bond->params.mode == BOND_MODE_8023AD) {
				bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
			}

			if ((bond->params.mode == BOND_MODE_TLB) ||
			    (bond->params.mode == BOND_MODE_ALB)) {
				bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
			}
		} else {
			if (USES_PRIMARY(bond->params.mode)) {
				printk(KERN_INFO DRV_NAME
				       ": %s: making interface %s the new "
				       "active one.\n",
				       bond->dev->name, new_active->dev->name);
			}
		}
	}

	if (USES_PRIMARY(bond->params.mode)) {
		bond_mc_swap(bond, new_active, old_active);
	}

	if ((bond->params.mode == BOND_MODE_TLB) ||
	    (bond->params.mode == BOND_MODE_ALB)) {
		bond_alb_handle_active_change(bond, new_active);
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		if (old_active)
			bond_set_slave_inactive_flags(old_active);
		if (new_active)
			bond_set_slave_active_flags(new_active);
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	} else {
		bond->curr_active_slave = new_active;
	}
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	if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
		if (old_active) {
			bond_set_slave_inactive_flags(old_active);
		}

		if (new_active) {
			bond_set_slave_active_flags(new_active);
		}
		bond_send_gratuitous_arp(bond);
	}
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}

/**
 * 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.
 */
1145
void bond_select_active_slave(struct bonding *bond)
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{
	struct slave *best_slave;
1148
	int rv;
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	best_slave = bond_find_best_slave(bond);
	if (best_slave != bond->curr_active_slave) {
		bond_change_active_slave(bond, best_slave);
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		rv = bond_set_carrier(bond);
		if (!rv)
			return;

		if (netif_carrier_ok(bond->dev)) {
			printk(KERN_INFO DRV_NAME
			       ": %s: first active interface up!\n",
			       bond->dev->name);
		} else {
			printk(KERN_INFO DRV_NAME ": %s: "
			       "now running without any active interface !\n",
			       bond->dev->name);
		}
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	}
}

/*--------------------------- 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 ----------------------------------*/

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static int bond_sethwaddr(struct net_device *bond_dev,
			  struct net_device *slave_dev)
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{
	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;
}

1237
#define BOND_INTERSECT_FEATURES \
1238
	(NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_TSO | NETIF_F_UFO)
1239 1240

/* 
1241 1242 1243
 * Compute the common dev->feature set available to all slaves.  Some
 * feature bits are managed elsewhere, so preserve feature bits set on
 * master device that are not part of the examined set.
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 */
static int bond_compute_features(struct bonding *bond)
{
1247
	unsigned long features = BOND_INTERSECT_FEATURES;
1248 1249
	struct slave *slave;
	struct net_device *bond_dev = bond->dev;
1250
	unsigned short max_hard_header_len = ETH_HLEN;
1251
	int i;
1252

1253
	bond_for_each_slave(bond, slave, i) {
1254
		features &= (slave->dev->features & BOND_INTERSECT_FEATURES);
1255 1256 1257
		if (slave->dev->hard_header_len > max_hard_header_len)
			max_hard_header_len = slave->dev->hard_header_len;
	}
1258 1259

	if ((features & NETIF_F_SG) && 
1260
	    !(features & NETIF_F_ALL_CSUM))
1261 1262
		features &= ~NETIF_F_SG;

1263 1264 1265 1266 1267 1268 1269 1270 1271 1272
	/* 
	 * features will include NETIF_F_TSO (NETIF_F_UFO) iff all 
	 * slave devices support NETIF_F_TSO (NETIF_F_UFO), which 
	 * implies that all slaves also support scatter-gather 
	 * (NETIF_F_SG), which implies that features also includes 
	 * NETIF_F_SG. So no need to check whether we have an  
	 * illegal combination of NETIF_F_{TSO,UFO} and 
	 * !NETIF_F_SG 
	 */

1273
	features |= (bond_dev->features & ~BOND_INTERSECT_FEATURES);
1274
	bond_dev->features = features;
1275
	bond_dev->hard_header_len = max_hard_header_len;
1276 1277 1278 1279

	return 0;
}

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/* enslave device <slave> to bond device <master> */
1281
int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
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{
	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;

1291 1292
	if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
		slave_dev->do_ioctl == NULL) {
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		printk(KERN_WARNING DRV_NAME
1294 1295
		       ": %s: Warning: no link monitoring support for %s\n",
		       bond_dev->name, slave_dev->name);
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	}

	/* 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
1316
			       ": %s: Error: cannot enslave VLAN "
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			       "challenged slave %s on VLAN enabled "
1318
			       "bond %s\n", bond_dev->name, slave_dev->name,
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			       bond_dev->name);
			return -EPERM;
		} else {
			printk(KERN_WARNING DRV_NAME
1323
			       ": %s: Warning: enslaved VLAN challenged "
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			       "slave %s. Adding VLANs will be blocked as "
			       "long as %s is part of bond %s\n",
1326
			       bond_dev->name, slave_dev->name, slave_dev->name,
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			       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;
		}
	}

1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352
	/*
	 * Old ifenslave binaries are no longer supported.  These can
	 * be identified with moderate accurary by the state of the slave:
	 * the current ifenslave will set the interface down prior to
	 * enslaving it; the old ifenslave will not.
	 */
	if ((slave_dev->flags & IFF_UP)) {
		printk(KERN_ERR DRV_NAME ": %s is up. "
		       "This may be due to an out of date ifenslave.\n",
		       slave_dev->name);
		res = -EPERM;
		goto err_undo_flags;
	}
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1354 1355
	if (slave_dev->set_mac_address == NULL) {
		printk(KERN_ERR DRV_NAME
1356 1357 1358 1359 1360
			": %s: Error: The slave device you specified does "
			"not support setting the MAC address. "
			"Your kernel likely does not support slave "
			"devices.\n", bond_dev->name);
  		res = -EOPNOTSUPP;
1361
		goto err_undo_flags;
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	}

1364
	new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
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	if (!new_slave) {
		res = -ENOMEM;
		goto err_undo_flags;
	}

	/* save slave's original flags before calling
	 * netdev_set_master and dev_open
	 */
	new_slave->original_flags = slave_dev->flags;

1375 1376 1377 1378 1379 1380
	/*
	 * Save slave's original ("permanent") mac address for modes
	 * that need 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);
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1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392
	/*
	 * 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;
	}
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1394 1395 1396 1397 1398
	res = netdev_set_master(slave_dev, bond_dev);
	if (res) {
		dprintk("Error %d calling netdev_set_master\n", res);
		goto err_close;
	}
1399 1400 1401 1402 1403
	/* 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;
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	}

	new_slave->dev = slave_dev;
1407
	slave_dev->priv_flags |= IFF_BONDING;
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	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;

1458 1459
	bond_compute_features(bond);

1460 1461
	new_slave->last_arp_rx = jiffies;

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	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
1476
			       ": %s: Warning: MII and ETHTOOL support not "
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			       "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",
1481
			       bond_dev->name, slave_dev->name);
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		} else if (link_reporting == -1) {
			/* unable get link status using mii/ethtool */
			printk(KERN_WARNING DRV_NAME
1485
			       ": %s: Warning: can't get link status from "
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			       "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",
1490
			       bond_dev->name, slave_dev->name);
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		}
	}

	/* 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
1517
		       ": %s: Warning: failed to get speed and duplex from %s, "
L
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		       "assumed to be 100Mb/sec and Full.\n",
1519
		       bond_dev->name, new_slave->dev->name);
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1520 1521

		if (bond->params.mode == BOND_MODE_8023AD) {
1522 1523
			printk(KERN_WARNING DRV_NAME
			       ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
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			       "support in base driver for proper aggregator "
1525
			       "selection.\n", bond_dev->name);
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		}
	}

	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:
1538 1539
		bond_set_slave_inactive_flags(new_slave);
		bond_select_active_slave(bond);
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		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);
1571 1572
		} else {
			bond_set_slave_inactive_flags(new_slave);
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		}
		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) */

1591 1592
	bond_set_carrier(bond);

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	write_unlock_bh(&bond->lock);

1595 1596 1597 1598
	res = bond_create_slave_symlinks(bond_dev, slave_dev);
	if (res)
		goto err_unset_master;

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	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;
1625
 
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	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.
 */
1640
int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
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{
	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
1651
		       ": %s: Error: cannot release %s.\n",
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		       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);
1664
		write_unlock_bh(&bond->lock);
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		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
1673
		       ": %s: Warning: the permanent HWaddr of %s "
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		       "- %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",
1678
		       bond_dev->name,
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		       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);

1712 1713
	bond_compute_features(bond);

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	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);
	}

1732
	if (oldcurrent == slave)
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		bond_select_active_slave(bond);

	if (bond->slave_cnt == 0) {
1736 1737
		bond_set_carrier(bond);

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		/* 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
1748
			       ": %s: Warning: clearing HW address of %s while it "
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			       "still has VLANs.\n",
1750
			       bond_dev->name, bond_dev->name);
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			printk(KERN_WARNING DRV_NAME
1752 1753 1754
			       ": %s: When re-adding slaves, make sure the bond's "
			       "HW address matches its VLANs'.\n",
			       bond_dev->name);
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		}
	} else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
		   !bond_has_challenged_slaves(bond)) {
		printk(KERN_INFO DRV_NAME
1759
		       ": %s: last VLAN challenged slave %s "
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		       "left bond %s. VLAN blocking is removed\n",
1761
		       bond_dev->name, slave_dev->name, bond_dev->name);
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		bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
	}

	write_unlock_bh(&bond->lock);

1767 1768 1769
	/* must do this from outside any spinlocks */
	bond_destroy_slave_symlinks(bond_dev, slave_dev);

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	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);

1796 1797 1798 1799
	/* 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);
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1801
	slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1802 1803
				   IFF_SLAVE_INACTIVE | IFF_BONDING |
				   IFF_SLAVE_NEEDARP);
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	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);

1822 1823
	netif_carrier_off(bond_dev);

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	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);
		}

1851 1852
		bond_compute_features(bond);

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		/* 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);

1859
		bond_destroy_slave_symlinks(bond_dev, slave_dev);
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		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);

1886 1887 1888 1889
		/* 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);
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Linus Torvalds 已提交
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1891 1892
		slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
					   IFF_SLAVE_INACTIVE);
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		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
1910
		       ": %s: Warning: clearing HW address of %s while it "
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Linus Torvalds 已提交
1911
		       "still has VLANs.\n",
1912
		       bond_dev->name, bond_dev->name);
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		printk(KERN_WARNING DRV_NAME
1914 1915 1916
		       ": %s: When re-adding slaves, make sure the bond's "
		       "HW address matches its VLANs'.\n",
		       bond_dev->name);
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1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033
	}

	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_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. */
2034
void bond_mii_monitor(struct net_device *bond_dev)
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{
	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 */
2233 2234 2235 2236 2237
			printk(KERN_ERR DRV_NAME
			       ": %s: Error: %s Illegal value (link=%d)\n",
			       bond_dev->name,
			       slave->dev->name,
			       slave->link);
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Linus Torvalds 已提交
2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260
			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);

		write_unlock(&bond->curr_slave_lock);
2261 2262
	} else
		bond_set_carrier(bond);
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re_arm:
	if (bond->params.miimon) {
		mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
	}
out:
	read_unlock(&bond->lock);
}

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static u32 bond_glean_dev_ip(struct net_device *dev)
{
	struct in_device *idev;
	struct in_ifaddr *ifa;
A
Al Viro 已提交
2277
	__be32 addr = 0;
J
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2278 2279 2280 2281 2282

	if (!dev)
		return 0;

	rcu_read_lock();
2283
	idev = __in_dev_get_rcu(dev);
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Jay Vosburgh 已提交
2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315
	if (!idev)
		goto out;

	ifa = idev->ifa_list;
	if (!ifa)
		goto out;

	addr = ifa->ifa_local;
out:
	rcu_read_unlock();
	return addr;
}

static int bond_has_ip(struct bonding *bond)
{
	struct vlan_entry *vlan, *vlan_next;

	if (bond->master_ip)
		return 1;

	if (list_empty(&bond->vlan_list))
		return 0;

	list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
				 vlan_list) {
		if (vlan->vlan_ip)
			return 1;
	}

	return 0;
}

2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334
static int bond_has_this_ip(struct bonding *bond, u32 ip)
{
	struct vlan_entry *vlan, *vlan_next;

	if (ip == bond->master_ip)
		return 1;

	if (list_empty(&bond->vlan_list))
		return 0;

	list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
				 vlan_list) {
		if (ip == vlan->vlan_ip)
			return 1;
	}

	return 0;
}

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2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364
/*
 * We go to the (large) trouble of VLAN tagging ARP frames because
 * switches in VLAN mode (especially if ports are configured as
 * "native" to a VLAN) might not pass non-tagged frames.
 */
static void bond_arp_send(struct net_device *slave_dev, int arp_op, u32 dest_ip, u32 src_ip, unsigned short vlan_id)
{
	struct sk_buff *skb;

	dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
	       slave_dev->name, dest_ip, src_ip, vlan_id);
	       
	skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
			 NULL, slave_dev->dev_addr, NULL);

	if (!skb) {
		printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
		return;
	}
	if (vlan_id) {
		skb = vlan_put_tag(skb, vlan_id);
		if (!skb) {
			printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
			return;
		}
	}
	arp_xmit(skb);
}


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Linus Torvalds 已提交
2365 2366
static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
{
J
Jay Vosburgh 已提交
2367
	int i, vlan_id, rv;
L
Linus Torvalds 已提交
2368
	u32 *targets = bond->params.arp_targets;
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Jay Vosburgh 已提交
2369 2370 2371 2372
	struct vlan_entry *vlan, *vlan_next;
	struct net_device *vlan_dev;
	struct flowi fl;
	struct rtable *rt;
L
Linus Torvalds 已提交
2373

2374 2375 2376
	for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
		if (!targets[i])
			continue;
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2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407
		dprintk("basa: target %x\n", targets[i]);
		if (list_empty(&bond->vlan_list)) {
			dprintk("basa: empty vlan: arp_send\n");
			bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
				      bond->master_ip, 0);
			continue;
		}

		/*
		 * If VLANs are configured, we do a route lookup to
		 * determine which VLAN interface would be used, so we
		 * can tag the ARP with the proper VLAN tag.
		 */
		memset(&fl, 0, sizeof(fl));
		fl.fl4_dst = targets[i];
		fl.fl4_tos = RTO_ONLINK;

		rv = ip_route_output_key(&rt, &fl);
		if (rv) {
			if (net_ratelimit()) {
				printk(KERN_WARNING DRV_NAME
			     ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
				       bond->dev->name, NIPQUAD(fl.fl4_dst));
			}
			continue;
		}

		/*
		 * This target is not on a VLAN
		 */
		if (rt->u.dst.dev == bond->dev) {
2408
			ip_rt_put(rt);
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Jay Vosburgh 已提交
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			dprintk("basa: rtdev == bond->dev: arp_send\n");
			bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
				      bond->master_ip, 0);
			continue;
		}

		vlan_id = 0;
		list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
					 vlan_list) {
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			vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
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			if (vlan_dev == rt->u.dst.dev) {
				vlan_id = vlan->vlan_id;
				dprintk("basa: vlan match on %s %d\n",
				       vlan_dev->name, vlan_id);
				break;
			}
		}

		if (vlan_id) {
2428
			ip_rt_put(rt);
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			bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
				      vlan->vlan_ip, vlan_id);
			continue;
		}

		if (net_ratelimit()) {
			printk(KERN_WARNING DRV_NAME
	       ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
			       bond->dev->name, NIPQUAD(fl.fl4_dst),
			       rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
		}
2440
		ip_rt_put(rt);
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	}
}

/*
 * Kick out a gratuitous ARP for an IP on the bonding master plus one
 * for each VLAN above us.
 */
static void bond_send_gratuitous_arp(struct bonding *bond)
{
	struct slave *slave = bond->curr_active_slave;
	struct vlan_entry *vlan;
	struct net_device *vlan_dev;

	dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
				slave ? slave->dev->name : "NULL");
	if (!slave)
		return;

	if (bond->master_ip) {
		bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
				  bond->master_ip, 0);
	}

	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
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		vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
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		if (vlan->vlan_ip) {
			bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
				      vlan->vlan_ip, vlan->vlan_id);
		}
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	}
}

2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519
static void bond_validate_arp(struct bonding *bond, struct slave *slave, u32 sip, u32 tip)
{
	int i;
	u32 *targets = bond->params.arp_targets;

	targets = bond->params.arp_targets;
	for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
		dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
			"%u.%u.%u.%u bhti(tip) %d\n",
		       NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
		       bond_has_this_ip(bond, tip));
		if (sip == targets[i]) {
			if (bond_has_this_ip(bond, tip))
				slave->last_arp_rx = jiffies;
			return;
		}
	}
}

static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
{
	struct arphdr *arp;
	struct slave *slave;
	struct bonding *bond;
	unsigned char *arp_ptr;
	u32 sip, tip;

	if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
		goto out;

	bond = dev->priv;
	read_lock(&bond->lock);

	dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
		bond->dev->name, skb->dev ? skb->dev->name : "NULL",
		orig_dev ? orig_dev->name : "NULL");

	slave = bond_get_slave_by_dev(bond, orig_dev);
	if (!slave || !slave_do_arp_validate(bond, slave))
		goto out_unlock;

	/* ARP header, plus 2 device addresses, plus 2 IP addresses.  */
	if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
				 (2 * dev->addr_len) +
				 (2 * sizeof(u32)))))
		goto out_unlock;

2520
	arp = arp_hdr(skb);
2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559
	if (arp->ar_hln != dev->addr_len ||
	    skb->pkt_type == PACKET_OTHERHOST ||
	    skb->pkt_type == PACKET_LOOPBACK ||
	    arp->ar_hrd != htons(ARPHRD_ETHER) ||
	    arp->ar_pro != htons(ETH_P_IP) ||
	    arp->ar_pln != 4)
		goto out_unlock;

	arp_ptr = (unsigned char *)(arp + 1);
	arp_ptr += dev->addr_len;
	memcpy(&sip, arp_ptr, 4);
	arp_ptr += 4 + dev->addr_len;
	memcpy(&tip, arp_ptr, 4);

	dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
		" tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
		slave->state, bond->params.arp_validate,
		slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));

	/*
	 * Backup slaves won't see the ARP reply, but do come through
	 * here for each ARP probe (so we swap the sip/tip to validate
	 * the probe).  In a "redundant switch, common router" type of
	 * configuration, the ARP probe will (hopefully) travel from
	 * the active, through one switch, the router, then the other
	 * switch before reaching the backup.
	 */
	if (slave->state == BOND_STATE_ACTIVE)
		bond_validate_arp(bond, slave, sip, tip);
	else
		bond_validate_arp(bond, slave, tip, sip);

out_unlock:
	read_unlock(&bond->lock);
out:
	dev_kfree_skb(skb);
	return NET_RX_SUCCESS;
}

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/*
 * 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.
 */
2567
void bond_loadbalance_arp_mon(struct net_device *bond_dev)
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{
	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)) &&
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			     bond_has_ip(bond))) {
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				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);

		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
 */
2698
void bond_activebackup_arp_mon(struct net_device *bond_dev)
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{
	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) {
2724 2725
			if ((jiffies - slave_last_rx(bond, slave)) <=
			     delta_in_ticks) {
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				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;
				}

2746 2747
				bond_set_carrier(bond);

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				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);
2754
					netif_carrier_on(bond->dev);
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				} 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) &&
2770
			    (((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
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			     bond_has_ip(bond))) {
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				/* 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)) ||
2817
	    (((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
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	     bond_has_ip(bond))) &&
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		    ((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
		 */
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		if (slave && bond_has_ip(bond)) {
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			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 */
2888
			bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
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				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;
2988 2989
	int i;
	u32 target;
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	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));

2998 2999 3000 3001 3002 3003 3004
	if (bond->params.mode == BOND_MODE_XOR ||
		bond->params.mode == BOND_MODE_8023AD) {
		seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
			xmit_hashtype_tbl[bond->params.xmit_policy].modename,
			bond->params.xmit_policy);
	}

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	if (USES_PRIMARY(bond->params.mode)) {
		seq_printf(seq, "Primary Slave: %s\n",
3007 3008
			   (bond->primary_slave) ?
			   bond->primary_slave->dev->name : "None");
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		seq_printf(seq, "Currently Active Slave: %s\n",
			   (curr) ? curr->dev->name : "None");
	}

3014 3015
	seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
		   "up" : "down");
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	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);

3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042

	/* ARP information */
	if(bond->params.arp_interval > 0) {
		int printed=0;
		seq_printf(seq, "ARP Polling Interval (ms): %d\n",
				bond->params.arp_interval);

		seq_printf(seq, "ARP IP target/s (n.n.n.n form):");

		for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
			if (!bond->params.arp_targets[i])
				continue;
			if (printed)
				seq_printf(seq, ",");
			target = ntohl(bond->params.arp_targets[i]);
			seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
			printed = 1;
		}
		seq_printf(seq, "\n");
	}

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	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");
3082
	seq_printf(seq, "Link Failure Count: %u\n",
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		   slave->link_failure_count);

3085 3086 3087 3088 3089
	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]);
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	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;
}

3140
static const struct file_operations bond_info_fops = {
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	.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
3248 3249 3250 3251
	down_write(&(bonding_rwsem));
        bond_destroy_sysfs_entry(bond);
        bond_create_sysfs_entry(bond);
	up_write(&(bonding_rwsem));
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	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;
3277
	struct bonding *bond = bond_dev->priv;
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	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;
3316 3317 3318
	case NETDEV_FEAT_CHANGE:
		bond_compute_features(bond);
		break;
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	default:
		break;
	}

	return NOTIFY_DONE;
}

/*
 * bond_netdev_event: handle netdev notifier chain events.
 *
 * This function receives events for the netdev chain.  The caller (an
3330
 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
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 * 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);

3342 3343 3344
	if (!(event_dev->priv_flags & IFF_BONDING))
		return NOTIFY_DONE;

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	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;
}

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/*
 * bond_inetaddr_event: handle inetaddr notifier chain events.
 *
 * We keep track of device IPs primarily to use as source addresses in
 * ARP monitor probes (rather than spewing out broadcasts all the time).
 *
 * We track one IP for the main device (if it has one), plus one per VLAN.
 */
static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	struct in_ifaddr *ifa = ptr;
	struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
	struct bonding *bond, *bond_next;
	struct vlan_entry *vlan, *vlan_next;

	list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
		if (bond->dev == event_dev) {
			switch (event) {
			case NETDEV_UP:
				bond->master_ip = ifa->ifa_local;
				return NOTIFY_OK;
			case NETDEV_DOWN:
				bond->master_ip = bond_glean_dev_ip(bond->dev);
				return NOTIFY_OK;
			default:
				return NOTIFY_DONE;
			}
		}

		if (list_empty(&bond->vlan_list))
			continue;

		list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
					 vlan_list) {
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			vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
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			if (vlan_dev == event_dev) {
				switch (event) {
				case NETDEV_UP:
					vlan->vlan_ip = ifa->ifa_local;
					return NOTIFY_OK;
				case NETDEV_DOWN:
					vlan->vlan_ip =
						bond_glean_dev_ip(vlan_dev);
					return NOTIFY_OK;
				default:
					return NOTIFY_DONE;
				}
			}
		}
	}
	return NOTIFY_DONE;
}

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static struct notifier_block bond_netdev_notifier = {
	.notifier_call = bond_netdev_event,
};

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static struct notifier_block bond_inetaddr_notifier = {
	.notifier_call = bond_inetaddr_event,
};

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/*-------------------------- 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));
}

3440 3441 3442 3443
void bond_register_arp(struct bonding *bond)
{
	struct packet_type *pt = &bond->arp_mon_pt;

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	if (pt->type)
		return;

3447
	pt->type = htons(ETH_P_ARP);
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	pt->dev = bond->dev;
3449 3450 3451 3452 3453 3454
	pt->func = bond_arp_rcv;
	dev_add_pack(pt);
}

void bond_unregister_arp(struct bonding *bond)
{
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	struct packet_type *pt = &bond->arp_mon_pt;

	dev_remove_pack(pt);
	pt->type = 0;
3459 3460
}

3461 3462 3463
/*---------------------------- Hashing Policies -----------------------------*/

/*
3464
 * Hash for the output device based upon layer 3 and layer 4 data. If
3465 3466 3467 3468 3469 3470 3471
 * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
 * altogether not IP, mimic bond_xmit_hash_policy_l2()
 */
static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
				    struct net_device *bond_dev, int count)
{
	struct ethhdr *data = (struct ethhdr *)skb->data;
3472
	struct iphdr *iph = ip_hdr(skb);
3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500
	u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
	int layer4_xor = 0;

	if (skb->protocol == __constant_htons(ETH_P_IP)) {
		if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
		    (iph->protocol == IPPROTO_TCP ||
		     iph->protocol == IPPROTO_UDP)) {
			layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
		}
		return (layer4_xor ^
			((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;

	}

	return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
}

/*
 * Hash for the output device based upon layer 2 data
 */
static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
				   struct net_device *bond_dev, int count)
{
	struct ethhdr *data = (struct ethhdr *)skb->data;

	return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
}

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/*-------------------------- 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;
		}
3547 3548 3549
		if (bond->params.arp_validate)
			bond_register_arp(bond);

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		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);
	}

3577 3578 3579
	if (bond->params.arp_validate)
		bond_unregister_arp(bond);

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	write_lock_bh(&bond->lock);


	/* 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;
	}


	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) {
R
Rusty Russell 已提交
3636
		sstats = slave->dev->get_stats(slave->dev);
3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661
		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;
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	}

	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 res = 0;

	dprintk("bond_ioctl: master=%s, cmd=%d\n",
		bond_dev->name, cmd);

	switch (cmd) {
	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);
3705
			if (netif_carrier_ok(bond->dev)) {
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				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;
	}

3754
	down_write(&(bonding_rwsem));
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	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);
	}

3787
	up_write(&(bonding_rwsem));
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3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871
	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);
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		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;
}

4035

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/*
 * in active-backup mode, we know that bond->curr_active_slave is always valid if
 * the bond has a usable interface.
 */
static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
{
	struct bonding *bond = bond_dev->priv;
	int res = 1;

	read_lock(&bond->lock);
	read_lock(&bond->curr_slave_lock);

	if (!BOND_IS_OK(bond)) {
		goto out;
	}

4052 4053 4054 4055 4056
	if (!bond->curr_active_slave)
		goto out;

	res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);

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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;
}

/*
4068 4069 4070
 * In bond_xmit_xor() , we determine the output device by using a pre-
 * determined xmit_hash_policy(), If the selected device is not enabled,
 * find the next active slave.
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 */
static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
{
	struct bonding *bond = bond_dev->priv;
	struct slave *slave, *start_at;
	int slave_no;
	int i;
	int res = 1;

	read_lock(&bond->lock);

	if (!BOND_IS_OK(bond)) {
		goto out;
	}

4086
	slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
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	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
4148 4149 4150
					       ": %s: Error: bond_xmit_broadcast(): "
					       "skb_clone() failed\n",
					       bond_dev->name);
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					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
 */
4183
void bond_set_mode_ops(struct bonding *bond, int mode)
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{
4185 4186
	struct net_device *bond_dev = bond->dev;

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	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;
4196 4197 4198 4199
		if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
			bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
		else
			bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
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		break;
	case BOND_MODE_BROADCAST:
		bond_dev->hard_start_xmit = bond_xmit_broadcast;
		break;
	case BOND_MODE_8023AD:
4205
		bond_set_master_3ad_flags(bond);
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		bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
4207 4208 4209 4210
		if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
			bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
		else
			bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
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		break;
	case BOND_MODE_ALB:
4213 4214 4215
		bond_set_master_alb_flags(bond);
		/* FALLTHRU */
	case BOND_MODE_TLB:
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		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
4222 4223
		       ": %s: Error: Unknown bonding mode %d\n",
		       bond_dev->name,
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		       mode);
		break;
	}
}

4229 4230 4231 4232 4233 4234 4235 4236
static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
				    struct ethtool_drvinfo *drvinfo)
{
	strncpy(drvinfo->driver, DRV_NAME, 32);
	strncpy(drvinfo->version, DRV_VERSION, 32);
	snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
}

4237
static const struct ethtool_ops bond_ethtool_ops = {
4238
	.get_tx_csum		= ethtool_op_get_tx_csum,
4239 4240
	.get_tso		= ethtool_op_get_tso,
	.get_ufo		= ethtool_op_get_ufo,
4241
	.get_sg			= ethtool_op_get_sg,
4242
	.get_drvinfo		= bond_ethtool_get_drvinfo,
4243 4244
};

L
Linus Torvalds 已提交
4245 4246 4247 4248
/*
 * Does not allocate but creates a /proc entry.
 * Allowed to fail.
 */
4249
static int bond_init(struct net_device *bond_dev, struct bond_params *params)
L
Linus Torvalds 已提交
4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273
{
	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;
4274
	bond_dev->ethtool_ops = &bond_ethtool_ops;
L
Linus Torvalds 已提交
4275 4276 4277 4278
	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;

4279
	bond_set_mode_ops(bond, bond->params.mode);
L
Linus Torvalds 已提交
4280 4281 4282 4283 4284 4285

	bond_dev->destructor = free_netdev;

	/* Initialize the device options */
	bond_dev->tx_queue_len = 0;
	bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4286
	bond_dev->priv_flags |= IFF_BONDING;
L
Linus Torvalds 已提交
4287 4288 4289 4290 4291 4292 4293 4294

	/* 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;

H
Herbert Xu 已提交
4295
	/* don't acquire bond device's netif_tx_lock when
L
Linus Torvalds 已提交
4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323
	 * 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.
 */
4324
void bond_deinit(struct net_device *bond_dev)
L
Linus Torvalds 已提交
4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344
{
	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;

4345 4346 4347
		bond_mc_list_destroy(bond);
		/* Release the bonded slaves */
		bond_release_all(bond_dev);
L
Linus Torvalds 已提交
4348
		bond_deinit(bond_dev);
4349
		unregister_netdevice(bond_dev);
L
Linus Torvalds 已提交
4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362
	}

#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.
 */
4363
int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
L
Linus Torvalds 已提交
4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380
{
	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)
{
4381 4382
	int arp_validate_value;

L
Linus Torvalds 已提交
4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395
	/*
	 * 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;
		}
	}

4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414
	if (xmit_hash_policy) {
		if ((bond_mode != BOND_MODE_XOR) &&
		    (bond_mode != BOND_MODE_8023AD)) {
			printk(KERN_INFO DRV_NAME
			       ": xor_mode param is irrelevant in mode %s\n",
			       bond_mode_name(bond_mode));
		} else {
			xmit_hashtype = bond_parse_parm(xmit_hash_policy,
							xmit_hashtype_tbl);
			if (xmit_hashtype == -1) {
				printk(KERN_ERR DRV_NAME
			       	": Error: Invalid xmit_hash_policy \"%s\"\n",
			       	xmit_hash_policy == NULL ? "NULL" :
				       xmit_hash_policy);
				return -EINVAL;
			}
		}
	}

L
Linus Torvalds 已提交
4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433
	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 "
4434
		       "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
L
Linus Torvalds 已提交
4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585
		       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;
	}

4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608
	if (arp_validate) {
		if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
			printk(KERN_ERR DRV_NAME
	       ": arp_validate only supported in active-backup mode\n");
			return -EINVAL;
		}
		if (!arp_interval) {
			printk(KERN_ERR DRV_NAME
			       ": arp_validate requires arp_interval\n");
			return -EINVAL;
		}

		arp_validate_value = bond_parse_parm(arp_validate,
						     arp_validate_tbl);
		if (arp_validate_value == -1) {
			printk(KERN_ERR DRV_NAME
			       ": Error: invalid arp_validate \"%s\"\n",
			       arp_validate == NULL ? "NULL" : arp_validate);
			return -EINVAL;
		}
	} else
		arp_validate_value = 0;

L
Linus Torvalds 已提交
4609 4610 4611 4612 4613 4614 4615 4616
	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
4617 4618 4619 4620
		       ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
		       arp_interval,
		       arp_validate_tbl[arp_validate_value].modename,
		       arp_ip_count);
L
Linus Torvalds 已提交
4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650

		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;
4651
	params->xmit_policy = xmit_hashtype;
L
Linus Torvalds 已提交
4652 4653
	params->miimon = miimon;
	params->arp_interval = arp_interval;
4654
	params->arp_validate = arp_validate_value;
L
Linus Torvalds 已提交
4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670
	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;
}

4671 4672
static struct lock_class_key bonding_netdev_xmit_lock_key;

4673
/* Create a new bond based on the specified name and bonding parameters.
4674
 * If name is NULL, obtain a suitable "bond%d" name for us.
4675 4676 4677 4678 4679 4680 4681 4682 4683
 * Caller must NOT hold rtnl_lock; we need to release it here before we
 * set up our sysfs entries.
 */
int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
{
	struct net_device *bond_dev;
	int res;

	rtnl_lock();
4684 4685
	bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
				ether_setup);
4686 4687 4688 4689 4690 4691 4692 4693
	if (!bond_dev) {
		printk(KERN_ERR DRV_NAME
		       ": %s: eek! can't alloc netdev!\n",
		       name);
		res = -ENOMEM;
		goto out_rtnl;
	}

4694 4695 4696 4697 4698 4699
	if (!name) {
		res = dev_alloc_name(bond_dev, "bond%d");
		if (res < 0)
			goto out_netdev;
	}

4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715
	/* bond_init() must be called after dev_alloc_name() (for the
	 * /proc files), but before register_netdevice(), because we
	 * need to set function pointers.
	 */

	res = bond_init(bond_dev, params);
	if (res < 0) {
		goto out_netdev;
	}

	SET_MODULE_OWNER(bond_dev);

	res = register_netdevice(bond_dev);
	if (res < 0) {
		goto out_bond;
	}
4716 4717 4718

	lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);

4719 4720 4721
	if (newbond)
		*newbond = bond_dev->priv;

4722 4723
	netif_carrier_off(bond_dev);

4724
	rtnl_unlock(); /* allows sysfs registration of net device */
4725
	res = bond_create_sysfs_entry(bond_dev->priv);
4726 4727 4728 4729 4730 4731 4732
	if (res < 0) {
		rtnl_lock();
		goto out_bond;
	}

	return 0;

4733 4734 4735 4736 4737 4738 4739 4740 4741
out_bond:
	bond_deinit(bond_dev);
out_netdev:
	free_netdev(bond_dev);
out_rtnl:
	rtnl_unlock();
	return res;
}

L
Linus Torvalds 已提交
4742 4743 4744 4745 4746 4747 4748
static int __init bonding_init(void)
{
	int i;
	int res;

	printk(KERN_INFO "%s", version);

4749
	res = bond_check_params(&bonding_defaults);
L
Linus Torvalds 已提交
4750
	if (res) {
4751
		goto out;
L
Linus Torvalds 已提交
4752 4753 4754 4755 4756 4757
	}

#ifdef CONFIG_PROC_FS
	bond_create_proc_dir();
#endif
	for (i = 0; i < max_bonds; i++) {
4758
		res = bond_create(NULL, &bonding_defaults, NULL);
4759 4760
		if (res)
			goto err;
L
Linus Torvalds 已提交
4761 4762
	}

4763 4764 4765 4766
	res = bond_create_sysfs();
	if (res)
		goto err;

L
Linus Torvalds 已提交
4767
	register_netdevice_notifier(&bond_netdev_notifier);
J
Jay Vosburgh 已提交
4768
	register_inetaddr_notifier(&bond_inetaddr_notifier);
L
Linus Torvalds 已提交
4769

4770 4771
	goto out;
err:
4772
	rtnl_lock();
L
Linus Torvalds 已提交
4773
	bond_free_all();
4774
	bond_destroy_sysfs();
L
Linus Torvalds 已提交
4775
	rtnl_unlock();
4776
out:
L
Linus Torvalds 已提交
4777
	return res;
4778

L
Linus Torvalds 已提交
4779 4780 4781 4782 4783
}

static void __exit bonding_exit(void)
{
	unregister_netdevice_notifier(&bond_netdev_notifier);
J
Jay Vosburgh 已提交
4784
	unregister_inetaddr_notifier(&bond_inetaddr_notifier);
L
Linus Torvalds 已提交
4785 4786 4787

	rtnl_lock();
	bond_free_all();
4788
	bond_destroy_sysfs();
L
Linus Torvalds 已提交
4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807
	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:
 */