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Merge branch 'bonding_rcu' 

Eric Dumazet says:

====================
bonding: rcu cleanups

RCU was added to bonding in linux-3.12 but lacked proper sparse annotations.

Using __rcu annotation actually helps to spot all accesses to
bond->curr_active_slave & cond->current_arp_slave
are correctly protected, with full sparse & LOCKDEP support.

Lets clean the code.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2014-07-15 17:50:22 -07:00
parent 725b70185d 8574171833
commit c8ad0f298c
6 changed files with 91 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
drivers/net/bonding/bond_alb.c
View File

@ -448,11 +448,13 @@ static struct slave *__rlb_next_rx_slave(struct bonding *bond)
*/ */
static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
{ {
if (!bond->curr_active_slave) struct slave *curr_active = bond_deref_active_protected(bond);
if (!curr_active)
return; return;
if (!bond->alb_info.primary_is_promisc) { if (!bond->alb_info.primary_is_promisc) {
if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1)) if (!dev_set_promiscuity(curr_active->dev, 1))
bond->alb_info.primary_is_promisc = 1; bond->alb_info.primary_is_promisc = 1;
else else
bond->alb_info.primary_is_promisc = 0; bond->alb_info.primary_is_promisc = 0;
@ -460,7 +462,7 @@ static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
bond->alb_info.rlb_promisc_timeout_counter = 0; bond->alb_info.rlb_promisc_timeout_counter = 0;
alb_send_learning_packets(bond->curr_active_slave, addr, true); alb_send_learning_packets(curr_active, addr, true);
} }
/* slave being removed should not be active at this point /* slave being removed should not be active at this point
@ -509,7 +511,7 @@ static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
write_lock_bh(&bond->curr_slave_lock); write_lock_bh(&bond->curr_slave_lock);
if (slave != bond->curr_active_slave) if (slave != bond_deref_active_protected(bond))
rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
write_unlock_bh(&bond->curr_slave_lock); write_unlock_bh(&bond->curr_slave_lock);
@ -684,7 +686,7 @@ static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bon
* move the old client to primary (curr_active_slave) so * move the old client to primary (curr_active_slave) so
* that the new client can be assigned to this entry. * that the new client can be assigned to this entry.
*/ */
if (bond->curr_active_slave && if (curr_active_slave &&
client_info->slave != curr_active_slave) { client_info->slave != curr_active_slave) {
client_info->slave = curr_active_slave; client_info->slave = curr_active_slave;
rlb_update_client(client_info); rlb_update_client(client_info);
@ -1221,7 +1223,7 @@ static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *sla
*/ */
static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
{ {
struct slave *has_bond_addr = bond->curr_active_slave; struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave);
struct slave *tmp_slave1, *free_mac_slave = NULL; struct slave *tmp_slave1, *free_mac_slave = NULL;
struct list_head *iter; struct list_head *iter;
@ -1575,7 +1577,7 @@ void bond_alb_monitor(struct work_struct *work)
* use mac of the slave device. * use mac of the slave device.
* In RLB mode, we always use strict matches. * In RLB mode, we always use strict matches.
*/ */
strict_match = (slave != bond->curr_active_slave || strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) ||
bond_info->rlb_enabled); bond_info->rlb_enabled);
alb_send_learning_packets(slave, slave->dev->dev_addr, alb_send_learning_packets(slave, slave->dev->dev_addr,
strict_match); strict_match);
@ -1593,7 +1595,7 @@ void bond_alb_monitor(struct work_struct *work)
bond_for_each_slave_rcu(bond, slave, iter) { bond_for_each_slave_rcu(bond, slave, iter) {
tlb_clear_slave(bond, slave, 1); tlb_clear_slave(bond, slave, 1);
if (slave == bond->curr_active_slave) { if (slave == rcu_access_pointer(bond->curr_active_slave)) {
SLAVE_TLB_INFO(slave).load = SLAVE_TLB_INFO(slave).load =
bond_info->unbalanced_load / bond_info->unbalanced_load /
BOND_TLB_REBALANCE_INTERVAL; BOND_TLB_REBALANCE_INTERVAL;
@ -1625,7 +1627,8 @@ void bond_alb_monitor(struct work_struct *work)
* because a slave was disabled then * because a slave was disabled then
* it can now leave promiscuous mode. * it can now leave promiscuous mode.
*/ */
dev_set_promiscuity(bond->curr_active_slave->dev, -1); dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev,
-1);
bond_info->primary_is_promisc = 0; bond_info->primary_is_promisc = 0;
rtnl_unlock(); rtnl_unlock();
@ -1742,17 +1745,21 @@ void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave
__acquires(&bond->curr_slave_lock) __acquires(&bond->curr_slave_lock)
{ {
struct slave *swap_slave; struct slave *swap_slave;
struct slave *curr_active;
if (bond->curr_active_slave == new_slave) curr_active = rcu_dereference_protected(bond->curr_active_slave,
!new_slave ||
lockdep_is_held(&bond->curr_slave_lock));
if (curr_active == new_slave)
return; return;
if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) { if (curr_active && bond->alb_info.primary_is_promisc) {
dev_set_promiscuity(bond->curr_active_slave->dev, -1); dev_set_promiscuity(curr_active->dev, -1);
bond->alb_info.primary_is_promisc = 0; bond->alb_info.primary_is_promisc = 0;
bond->alb_info.rlb_promisc_timeout_counter = 0; bond->alb_info.rlb_promisc_timeout_counter = 0;
} }
swap_slave = bond->curr_active_slave; swap_slave = curr_active;
rcu_assign_pointer(bond->curr_active_slave, new_slave); rcu_assign_pointer(bond->curr_active_slave, new_slave);
if (!new_slave || !bond_has_slaves(bond)) if (!new_slave || !bond_has_slaves(bond))
@ -1818,6 +1825,7 @@ int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
{ {
struct bonding *bond = netdev_priv(bond_dev); struct bonding *bond = netdev_priv(bond_dev);
struct sockaddr *sa = addr; struct sockaddr *sa = addr;
struct slave *curr_active;
struct slave *swap_slave; struct slave *swap_slave;
int res; int res;
@ -1834,23 +1842,24 @@ int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
* Otherwise we'll need to pass the new address to it and handle * Otherwise we'll need to pass the new address to it and handle
* duplications. * duplications.
*/ */
if (!bond->curr_active_slave) curr_active = rtnl_dereference(bond->curr_active_slave);
if (!curr_active)
return 0; return 0;
swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr); swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr);
if (swap_slave) { if (swap_slave) {
alb_swap_mac_addr(swap_slave, bond->curr_active_slave); alb_swap_mac_addr(swap_slave, curr_active);
alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave); alb_fasten_mac_swap(bond, swap_slave, curr_active);
} else { } else {
alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr); alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr);
read_lock(&bond->lock); read_lock(&bond->lock);
alb_send_learning_packets(bond->curr_active_slave, alb_send_learning_packets(curr_active,
bond_dev->dev_addr, false); bond_dev->dev_addr, false);
if (bond->alb_info.rlb_enabled) { if (bond->alb_info.rlb_enabled) {
/* inform clients mac address has changed */ /* inform clients mac address has changed */
rlb_req_update_slave_clients(bond, bond->curr_active_slave); rlb_req_update_slave_clients(bond, curr_active);
} }
read_unlock(&bond->lock); read_unlock(&bond->lock);
} }

68
drivers/net/bonding/bond_main.c
View File

@ -498,11 +498,11 @@ static int bond_set_promiscuity(struct bonding *bond, int inc)
int err = 0; int err = 0;
if (bond_uses_primary(bond)) { if (bond_uses_primary(bond)) {
struct slave *curr_active = bond_deref_active_protected(bond);
/* write lock already acquired */ /* write lock already acquired */
if (bond->curr_active_slave) { if (curr_active)
err = dev_set_promiscuity(bond->curr_active_slave->dev, err = dev_set_promiscuity(curr_active->dev, inc);
inc);
}
} else { } else {
struct slave *slave; struct slave *slave;
@ -524,11 +524,11 @@ static int bond_set_allmulti(struct bonding *bond, int inc)
int err = 0; int err = 0;
if (bond_uses_primary(bond)) { if (bond_uses_primary(bond)) {
struct slave *curr_active = bond_deref_active_protected(bond);
/* write lock already acquired */ /* write lock already acquired */
if (bond->curr_active_slave) { if (curr_active)
err = dev_set_allmulti(bond->curr_active_slave->dev, err = dev_set_allmulti(curr_active->dev, inc);
inc);
}
} else { } else {
struct slave *slave; struct slave *slave;
@ -713,7 +713,7 @@ static void bond_do_fail_over_mac(struct bonding *bond,
static bool bond_should_change_active(struct bonding *bond) static bool bond_should_change_active(struct bonding *bond)
{ {
struct slave *prim = bond->primary_slave; struct slave *prim = bond->primary_slave;
struct slave *curr = bond->curr_active_slave; struct slave *curr = bond_deref_active_protected(bond);
if (!prim || !curr || curr->link != BOND_LINK_UP) if (!prim || !curr || curr->link != BOND_LINK_UP)
return true; return true;
@ -792,7 +792,11 @@ static bool bond_should_notify_peers(struct bonding *bond)
*/ */
void bond_change_active_slave(struct bonding *bond, struct slave *new_active) void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
{ {
struct slave *old_active = bond->curr_active_slave; struct slave *old_active;
old_active = rcu_dereference_protected(bond->curr_active_slave,
!new_active ||
lockdep_is_held(&bond->curr_slave_lock));
if (old_active == new_active) if (old_active == new_active)
return; return;
@ -900,7 +904,7 @@ void bond_select_active_slave(struct bonding *bond)
int rv; int rv;
best_slave = bond_find_best_slave(bond); best_slave = bond_find_best_slave(bond);
if (best_slave != bond->curr_active_slave) { if (best_slave != bond_deref_active_protected(bond)) {
bond_change_active_slave(bond, best_slave); bond_change_active_slave(bond, best_slave);
rv = bond_set_carrier(bond); rv = bond_set_carrier(bond);
if (!rv) if (!rv)
@ -1531,7 +1535,8 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
* anyway (it holds no special properties of the bond device), * anyway (it holds no special properties of the bond device),
* so we can change it without calling change_active_interface() * so we can change it without calling change_active_interface()
*/ */
if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP) if (!rcu_access_pointer(bond->curr_active_slave) &&
new_slave->link == BOND_LINK_UP)
rcu_assign_pointer(bond->curr_active_slave, new_slave); rcu_assign_pointer(bond->curr_active_slave, new_slave);
break; break;
@ -1602,7 +1607,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
vlan_vids_del_by_dev(slave_dev, bond_dev); vlan_vids_del_by_dev(slave_dev, bond_dev);
if (bond->primary_slave == new_slave) if (bond->primary_slave == new_slave)
bond->primary_slave = NULL; bond->primary_slave = NULL;
if (bond->curr_active_slave == new_slave) { if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
block_netpoll_tx(); block_netpoll_tx();
write_lock_bh(&bond->curr_slave_lock); write_lock_bh(&bond->curr_slave_lock);
bond_change_active_slave(bond, NULL); bond_change_active_slave(bond, NULL);
@ -1704,9 +1709,9 @@ static int __bond_release_one(struct net_device *bond_dev,
bond_is_active_slave(slave) ? "active" : "backup", bond_is_active_slave(slave) ? "active" : "backup",
slave_dev->name); slave_dev->name);
oldcurrent = bond->curr_active_slave; oldcurrent = rcu_access_pointer(bond->curr_active_slave);
bond->current_arp_slave = NULL; RCU_INIT_POINTER(bond->current_arp_slave, NULL);
if (!all && (!bond->params.fail_over_mac || if (!all && (!bond->params.fail_over_mac ||
BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
@ -1878,7 +1883,7 @@ static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *in
/*-------------------------------- Monitoring -------------------------------*/ /*-------------------------------- Monitoring -------------------------------*/
/* called with rcu_read_lock() */
static int bond_miimon_inspect(struct bonding *bond) static int bond_miimon_inspect(struct bonding *bond)
{ {
int link_state, commit = 0; int link_state, commit = 0;
@ -1886,7 +1891,7 @@ static int bond_miimon_inspect(struct bonding *bond)
struct slave *slave; struct slave *slave;
bool ignore_updelay; bool ignore_updelay;
ignore_updelay = !bond->curr_active_slave ? true : false; ignore_updelay = !rcu_dereference(bond->curr_active_slave);
bond_for_each_slave_rcu(bond, slave, iter) { bond_for_each_slave_rcu(bond, slave, iter) {
slave->new_link = BOND_LINK_NOCHANGE; slave->new_link = BOND_LINK_NOCHANGE;
@ -2046,7 +2051,7 @@ static void bond_miimon_commit(struct bonding *bond)
bond_alb_handle_link_change(bond, slave, bond_alb_handle_link_change(bond, slave,
BOND_LINK_DOWN); BOND_LINK_DOWN);
if (slave == bond->curr_active_slave) if (slave == rcu_access_pointer(bond->curr_active_slave))
goto do_failover; goto do_failover;
continue; continue;
@ -2416,7 +2421,7 @@ static void bond_loadbalance_arp_mon(struct work_struct *work)
rcu_read_lock(); rcu_read_lock();
oldcurrent = ACCESS_ONCE(bond->curr_active_slave); oldcurrent = rcu_dereference(bond->curr_active_slave);
/* see if any of the previous devices are up now (i.e. they have /* 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 * xmt and rcv traffic). the curr_active_slave does not come into
* the picture unless it is null. also, slave->last_link_up is not * the picture unless it is null. also, slave->last_link_up is not
@ -2564,7 +2569,7 @@ static int bond_ab_arp_inspect(struct bonding *bond)
* before being taken out * before being taken out
*/ */
if (!bond_is_active_slave(slave) && if (!bond_is_active_slave(slave) &&
!bond->current_arp_slave && !rcu_access_pointer(bond->current_arp_slave) &&
!bond_time_in_interval(bond, last_rx, 3)) { !bond_time_in_interval(bond, last_rx, 3)) {
slave->new_link = BOND_LINK_DOWN; slave->new_link = BOND_LINK_DOWN;
commit++; commit++;
@ -2607,21 +2612,24 @@ static void bond_ab_arp_commit(struct bonding *bond)
case BOND_LINK_UP: case BOND_LINK_UP:
trans_start = dev_trans_start(slave->dev); trans_start = dev_trans_start(slave->dev);
if (bond->curr_active_slave != slave || if (rtnl_dereference(bond->curr_active_slave) != slave ||
(!bond->curr_active_slave && (!rtnl_dereference(bond->curr_active_slave) &&
bond_time_in_interval(bond, trans_start, 1))) { bond_time_in_interval(bond, trans_start, 1))) {
struct slave *current_arp_slave;
current_arp_slave = rtnl_dereference(bond->current_arp_slave);
slave->link = BOND_LINK_UP; slave->link = BOND_LINK_UP;
if (bond->current_arp_slave) { if (current_arp_slave) {
bond_set_slave_inactive_flags( bond_set_slave_inactive_flags(
bond->current_arp_slave, current_arp_slave,
BOND_SLAVE_NOTIFY_NOW); BOND_SLAVE_NOTIFY_NOW);
bond->current_arp_slave = NULL; RCU_INIT_POINTER(bond->current_arp_slave, NULL);
} }
pr_info("%s: link status definitely up for interface %s\n", pr_info("%s: link status definitely up for interface %s\n",
bond->dev->name, slave->dev->name); bond->dev->name, slave->dev->name);
if (!bond->curr_active_slave || if (!rtnl_dereference(bond->curr_active_slave) ||
(slave == bond->primary_slave)) (slave == bond->primary_slave))
goto do_failover; goto do_failover;
@ -2640,8 +2648,8 @@ static void bond_ab_arp_commit(struct bonding *bond)
pr_info("%s: link status definitely down for interface %s, disabling it\n", pr_info("%s: link status definitely down for interface %s, disabling it\n",
bond->dev->name, slave->dev->name); bond->dev->name, slave->dev->name);
if (slave == bond->curr_active_slave) { if (slave == rtnl_dereference(bond->curr_active_slave)) {
bond->current_arp_slave = NULL; RCU_INIT_POINTER(bond->current_arp_slave, NULL);
goto do_failover; goto do_failover;
} }
@ -3097,8 +3105,8 @@ static int bond_open(struct net_device *bond_dev)
if (bond_has_slaves(bond)) { if (bond_has_slaves(bond)) {
read_lock(&bond->curr_slave_lock); read_lock(&bond->curr_slave_lock);
bond_for_each_slave(bond, slave, iter) { bond_for_each_slave(bond, slave, iter) {
if (bond_uses_primary(bond) if (bond_uses_primary(bond) &&
&& (slave != bond->curr_active_slave)) { slave != rcu_access_pointer(bond->curr_active_slave)) {
bond_set_slave_inactive_flags(slave, bond_set_slave_inactive_flags(slave,
BOND_SLAVE_NOTIFY_NOW); BOND_SLAVE_NOTIFY_NOW);
} else { } else {

21
drivers/net/bonding/bond_netlink.c
View File

@ -398,20 +398,31 @@ static size_t bond_get_size(const struct net_device *bond_dev)
0; 0;
} }
static int bond_option_active_slave_get_ifindex(struct bonding *bond)
{
const struct net_device *slave;
int ifindex;
rcu_read_lock();
slave = bond_option_active_slave_get_rcu(bond);
ifindex = slave ? slave->ifindex : 0;
rcu_read_unlock();
return ifindex;
}
static int bond_fill_info(struct sk_buff *skb, static int bond_fill_info(struct sk_buff *skb,
const struct net_device *bond_dev) const struct net_device *bond_dev)
{ {
struct bonding *bond = netdev_priv(bond_dev); struct bonding *bond = netdev_priv(bond_dev);
struct net_device *slave_dev = bond_option_active_slave_get(bond);
struct nlattr *targets;
unsigned int packets_per_slave; unsigned int packets_per_slave;
int i, targets_added; int ifindex, i, targets_added;
struct nlattr *targets;
if (nla_put_u8(skb, IFLA_BOND_MODE, BOND_MODE(bond))) if (nla_put_u8(skb, IFLA_BOND_MODE, BOND_MODE(bond)))
goto nla_put_failure; goto nla_put_failure;
if (slave_dev && ifindex = bond_option_active_slave_get_ifindex(bond);
nla_put_u32(skb, IFLA_BOND_ACTIVE_SLAVE, slave_dev->ifindex)) if (ifindex && nla_put_u32(skb, IFLA_BOND_ACTIVE_SLAVE, ifindex))
goto nla_put_failure; goto nla_put_failure;
if (nla_put_u32(skb, IFLA_BOND_MIIMON, bond->params.miimon)) if (nla_put_u32(skb, IFLA_BOND_MIIMON, bond->params.miimon))

7
drivers/net/bonding/bond_options.c
View File

@ -704,11 +704,6 @@ struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
return __bond_option_active_slave_get(bond, slave); return __bond_option_active_slave_get(bond, slave);
} }
struct net_device *bond_option_active_slave_get(struct bonding *bond)
{
return __bond_option_active_slave_get(bond, bond->curr_active_slave);
}
static int bond_option_active_slave_set(struct bonding *bond, static int bond_option_active_slave_set(struct bonding *bond,
const struct bond_opt_value *newval) const struct bond_opt_value *newval)
{ {
@ -748,7 +743,7 @@ static int bond_option_active_slave_set(struct bonding *bond,
RCU_INIT_POINTER(bond->curr_active_slave, NULL); RCU_INIT_POINTER(bond->curr_active_slave, NULL);
bond_select_active_slave(bond); bond_select_active_slave(bond);
} else { } else {
struct slave *old_active = bond->curr_active_slave; struct slave *old_active = bond_deref_active_protected(bond);
struct slave *new_active = bond_slave_get_rtnl(slave_dev); struct slave *new_active = bond_slave_get_rtnl(slave_dev);
BUG_ON(!new_active); BUG_ON(!new_active);

3
drivers/net/bonding/bond_sysfs.c
View File

@ -492,8 +492,9 @@ static ssize_t bonding_show_mii_status(struct device *d,
char *buf) char *buf)
{ {
struct bonding *bond = to_bond(d); struct bonding *bond = to_bond(d);
bool active = !!rcu_access_pointer(bond->curr_active_slave);
return sprintf(buf, "%s\n", bond->curr_active_slave ? "up" : "down"); return sprintf(buf, "%s\n", active ? "up" : "down");
} }
static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL); static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);

9
drivers/net/bonding/bonding.h
View File

@ -194,8 +194,8 @@ struct slave {
*/ */
struct bonding { struct bonding {
struct net_device *dev; /* first - useful for panic debug */ struct net_device *dev; /* first - useful for panic debug */
struct slave *curr_active_slave; struct slave __rcu *curr_active_slave;
struct slave *current_arp_slave; struct slave __rcu *current_arp_slave;
struct slave *primary_slave; struct slave *primary_slave;
bool force_primary; bool force_primary;
s32 slave_cnt; /* never change this value outside the attach/detach wrappers */ s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
@ -232,6 +232,10 @@ struct bonding {
#define bond_slave_get_rtnl(dev) \ #define bond_slave_get_rtnl(dev) \
((struct slave *) rtnl_dereference(dev->rx_handler_data)) ((struct slave *) rtnl_dereference(dev->rx_handler_data))
#define bond_deref_active_protected(bond) \
rcu_dereference_protected(bond->curr_active_slave, \
lockdep_is_held(&bond->curr_slave_lock))
struct bond_vlan_tag { struct bond_vlan_tag {
__be16 vlan_proto; __be16 vlan_proto;
unsigned short vlan_id; unsigned short vlan_id;
@ -514,7 +518,6 @@ unsigned int bond_get_num_tx_queues(void);
int bond_netlink_init(void); int bond_netlink_init(void);
void bond_netlink_fini(void); void bond_netlink_fini(void);
struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond); struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
struct net_device *bond_option_active_slave_get(struct bonding *bond);
const char *bond_slave_link_status(s8 link); const char *bond_slave_link_status(s8 link);
bool bond_verify_device_path(struct net_device *start_dev, bool bond_verify_device_path(struct net_device *start_dev,
struct net_device *end_dev, struct net_device *end_dev,