bond_main.c 135 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.
 *
 */

#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>
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#include <linux/io.h>
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#include <asm/system.h>
#include <asm/dma.h>
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#include <linux/uaccess.h>
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#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 <linux/jiffies.h>
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#include <net/route.h>
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#include <net/net_namespace.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;
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static int num_grat_arp = 1;
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static int num_unsol_na = 1;
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static int miimon	= BOND_LINK_MON_INTERV;
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static int updelay;
static int downdelay;
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static int use_carrier	= 1;
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static char *mode;
static char *primary;
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static char *primary_reselect;
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static char *lacp_rate;
static char *ad_select;
static char *xmit_hash_policy;
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static int arp_interval = BOND_LINK_ARP_INTERV;
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static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
static char *arp_validate;
static char *fail_over_mac;
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static 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");
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module_param(num_grat_arp, int, 0644);
MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
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module_param(num_unsol_na, int, 0644);
MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
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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");
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module_param(primary_reselect, charp, 0);
MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
				   "once it comes up; "
				   "0 for always (default), "
				   "1 for only if speed of primary is "
				   "better, "
				   "2 for only on active slave "
				   "failure");
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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(ad_select, charp, 0);
MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
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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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module_param(fail_over_mac, charp, 0);
MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
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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
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static struct proc_dir_entry *bond_proc_dir;
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#endif

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static __be32 arp_target[BOND_MAX_ARP_TARGETS];
static int arp_ip_count;
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static int bond_mode	= BOND_MODE_ROUNDROBIN;
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static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
static int lacp_fast;
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const 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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const 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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const struct bond_parm_tbl xmit_hashtype_tbl[] = {
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{	"layer2",		BOND_XMIT_POLICY_LAYER2},
{	"layer3+4",		BOND_XMIT_POLICY_LAYER34},
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{	"layer2+3",		BOND_XMIT_POLICY_LAYER23},
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{	NULL,			-1},
};

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const struct bond_parm_tbl arp_validate_tbl[] = {
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{	"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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const struct bond_parm_tbl fail_over_mac_tbl[] = {
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{	"none",			BOND_FOM_NONE},
{	"active",		BOND_FOM_ACTIVE},
{	"follow",		BOND_FOM_FOLLOW},
{	NULL,			-1},
};

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const struct bond_parm_tbl pri_reselect_tbl[] = {
{	"always",		BOND_PRI_RESELECT_ALWAYS},
{	"better",		BOND_PRI_RESELECT_BETTER},
{	"failure",		BOND_PRI_RESELECT_FAILURE},
{	NULL,			-1},
};

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struct bond_parm_tbl ad_select_tbl[] = {
{	"stable",	BOND_AD_STABLE},
{	"bandwidth",	BOND_AD_BANDWIDTH},
{	"count",	BOND_AD_COUNT},
{	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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static int bond_init(struct net_device *bond_dev);
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static void bond_deinit(struct net_device *bond_dev);
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/*---------------------------- General routines -----------------------------*/

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static const char *bond_mode_name(int mode)
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{
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	static const char *names[] = {
		[BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
		[BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
		[BOND_MODE_XOR] = "load balancing (xor)",
		[BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
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		[BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
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		[BOND_MODE_TLB] = "transmit load balancing",
		[BOND_MODE_ALB] = "adaptive load balancing",
	};

	if (mode < 0 || mode > BOND_MODE_ALB)
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		return "unknown";
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	return names[mode];
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}

/*---------------------------------- 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;

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	pr_debug("bond: %s, vlan id %d\n",
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		(bond ? bond->dev->name : "None"), vlan_id);
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	vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
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	if (!vlan)
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		return -ENOMEM;

	INIT_LIST_HEAD(&vlan->vlan_list);
	vlan->vlan_id = vlan_id;

	write_lock_bh(&bond->lock);

	list_add_tail(&vlan->vlan_list, &bond->vlan_list);

	write_unlock_bh(&bond->lock);

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	pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
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	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)
{
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	struct vlan_entry *vlan;
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	int res = -ENODEV;

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	pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
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	write_lock_bh(&bond->lock);

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	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
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		if (vlan->vlan_id == vlan_id) {
			list_del(&vlan->vlan_list);

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			if (bond_is_lb(bond))
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				bond_alb_clear_vlan(bond, vlan_id);

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			pr_debug("removed VLAN ID %d from bond %s\n", vlan_id,
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				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;
		}
	}

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	pr_debug("couldn't find VLAN ID %d in bond %s\n", vlan_id,
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		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) {
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			pr_debug("found VLAN challenged slave - %s\n",
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				slave->dev->name);
			return 1;
		}
	}

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	pr_debug("no VLAN challenged slaves found\n");
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	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).
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 *
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 * Caller must hold bond->lock
 */
struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
{
	struct vlan_entry *next, *last;

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	if (list_empty(&bond->vlan_list))
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		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.
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 *
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 * @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
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 *
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 * 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.
 */
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int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
			struct net_device *slave_dev)
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{
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	unsigned short uninitialized_var(vlan_id);
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	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.
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 *
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 * 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
 */
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static void bond_vlan_rx_register(struct net_device *bond_dev,
				  struct vlan_group *grp)
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{
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	struct bonding *bond = netdev_priv(bond_dev);
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	struct slave *slave;
	int i;

	bond->vlgrp = grp;

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;
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		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
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		if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
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		    slave_ops->ndo_vlan_rx_register) {
			slave_ops->ndo_vlan_rx_register(slave_dev, grp);
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		}
	}
}

/**
 * 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)
{
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	struct bonding *bond = netdev_priv(bond_dev);
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	struct slave *slave;
	int i, res;

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;
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		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
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		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
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		    slave_ops->ndo_vlan_rx_add_vid) {
			slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
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		}
	}

	res = bond_add_vlan(bond, vid);
	if (res) {
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		pr_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)
{
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	struct bonding *bond = netdev_priv(bond_dev);
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	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;
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		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
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		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
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		    slave_ops->ndo_vlan_rx_kill_vid) {
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			/* 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_ops->ndo_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) {
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		pr_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;
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	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
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	write_lock_bh(&bond->lock);

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	if (list_empty(&bond->vlan_list))
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		goto out;

	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
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	    slave_ops->ndo_vlan_rx_register)
		slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
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	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
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	    !(slave_ops->ndo_vlan_rx_add_vid))
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		goto out;

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	list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
		slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
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out:
	write_unlock_bh(&bond->lock);
}

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static void bond_del_vlans_from_slave(struct bonding *bond,
				      struct net_device *slave_dev)
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{
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	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
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	struct vlan_entry *vlan;
	struct net_device *vlan_dev;

	write_lock_bh(&bond->lock);

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	if (list_empty(&bond->vlan_list))
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		goto out;

	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
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	    !(slave_ops->ndo_vlan_rx_kill_vid))
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		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_ops->ndo_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) &&
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	    slave_ops->ndo_vlan_rx_register)
		slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
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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;
	struct ethtool_cmd etool;
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	int res;
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	/* Fake speed and duplex */
	slave->speed = SPEED_100;
	slave->duplex = DUPLEX_FULL;

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	if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
		return -1;
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	res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
	if (res < 0)
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		return -1;

	switch (etool.speed) {
	case SPEED_10:
	case SPEED_100:
	case SPEED_1000:
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	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(),
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 * depending upon the setting of the use_carrier parameter.
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 *
 * 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.
 */
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static int bond_check_dev_link(struct bonding *bond,
			       struct net_device *slave_dev, int reporting)
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{
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	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
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	static int (*ioctl)(struct net_device *, struct ifreq *, int);
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	struct ifreq ifr;
	struct mii_ioctl_data *mii;

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	if (!reporting && !netif_running(slave_dev))
		return 0;

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	if (bond->params.use_carrier)
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		return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;

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	/* Try to get link status using Ethtool first. */
	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;
		}
	}

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	/* Ethtool can't be used, fallback to MII ioctls. */
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	ioctl = slave_ops->ndo_do_ioctl;
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	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;
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			if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
				return mii->val_out & BMSR_LSTATUS;
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		}
	}

	/*
	 * If reporting, report that either there's no dev->do_ioctl,
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	 * or both SIOCGMIIREG and get_link failed (meaning that we
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	 * cannot report link status).  If not reporting, pretend
	 * we're ok.
	 */
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	return reporting ? -1 : BMSR_LSTATUS;
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}

/*----------------------------- Multicast list ------------------------------*/

/*
 * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
 */
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static inline int bond_is_dmi_same(const struct dev_mc_list *dmi1,
				   const struct dev_mc_list *dmi2)
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{
	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
 */
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static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi,
						 struct dev_mc_list *mc_list)
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{
	struct dev_mc_list *idmi;

	for (idmi = mc_list; idmi; idmi = idmi->next) {
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		if (bond_is_dmi_same(dmi, idmi))
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			return idmi;
	}

	return NULL;
}

/*
 * Push the promiscuity flag down to appropriate slaves
 */
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static int bond_set_promiscuity(struct bonding *bond, int inc)
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{
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	int err = 0;
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	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
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			err = dev_set_promiscuity(bond->curr_active_slave->dev,
						  inc);
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		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
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			err = dev_set_promiscuity(slave->dev, inc);
			if (err)
				return err;
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		}
	}
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	return err;
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}

/*
 * Push the allmulti flag down to all slaves
 */
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static int bond_set_allmulti(struct bonding *bond, int inc)
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{
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	int err = 0;
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	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
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			err = dev_set_allmulti(bond->curr_active_slave->dev,
					       inc);
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		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
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			err = dev_set_allmulti(slave->dev, inc);
			if (err)
				return err;
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		}
	}
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	return err;
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}

/*
 * 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 */
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		if (bond->curr_active_slave)
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			dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
	} else {
		struct slave *slave;
		int i;
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		bond_for_each_slave(bond, slave, i)
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			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 */
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		if (bond->curr_active_slave)
			dev_mc_delete(bond->curr_active_slave->dev, addr,
				      alen, 0);
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	} 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) {
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		for (im = in_dev->mc_list; im; im = im->next)
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			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
 */
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static void bond_mc_list_flush(struct net_device *bond_dev,
			       struct net_device *slave_dev)
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{
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	struct bonding *bond = netdev_priv(bond_dev);
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	struct dev_mc_list *dmi;

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	for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next)
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		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.
 */
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static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
			 struct slave *old_active)
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{
	struct dev_mc_list *dmi;

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	if (!USES_PRIMARY(bond->params.mode))
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		/* nothing to do -  mc list is already up-to-date on
		 * all slaves
		 */
		return;

	if (old_active) {
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		if (bond->dev->flags & IFF_PROMISC)
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			dev_set_promiscuity(old_active->dev, -1);

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		if (bond->dev->flags & IFF_ALLMULTI)
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			dev_set_allmulti(old_active->dev, -1);

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		for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next)
			dev_mc_delete(old_active->dev, dmi->dmi_addr,
				      dmi->dmi_addrlen, 0);
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	}

	if (new_active) {
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		/* FIXME: Signal errors upstream. */
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		if (bond->dev->flags & IFF_PROMISC)
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			dev_set_promiscuity(new_active->dev, 1);

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		if (bond->dev->flags & IFF_ALLMULTI)