Commit 4d961a10 authored by David S. Miller's avatar David S. Miller

Merge branch 'bonding_monitor_locking'

Ding Tianhong says:

====================
bonding: patchset for rcu use in bonding

The slave list will add and del by bond_master_upper_dev_link() and
bond_upper_dev_unlink(), which will call call_netdevice_notifiers(),
even it is safe to call it in write bond lock now, but we can't sure
that whether it is safe later, because other drivers may deal
NETDEV_CHANGEUPPER in sleep way, so I didn't admit move the
bond_upper_dev_unlink() in write bond lock.

now the bond_for_each_slave only protect by rtnl_lock(), maybe use
bond_for_each_slave_rcu is a good way to protect slave list for bond,
but as a system slow path, it is no need to transform
bond_for_each_slave() to bond_for_each_slave_rcu() in slow path, so in
the patchset, I will remove the unused read bond lock for monitor
function, maybe it is a better way, I will wait to accept any relay
for it.

Thanks for the Veaceslav Falico opinion.

v2: add and modify commit for patchset and patch, it will be the first
step for the whole patchset.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents a00f6fcc 5cc172c6
......@@ -2068,8 +2068,10 @@ void bond_3ad_state_machine_handler(struct work_struct *work)
struct slave *slave;
struct port *port;
read_lock(&bond->lock);
if (!rtnl_trylock()) {
queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
return;
}
//check if there are any slaves
if (!bond_has_slaves(bond))
goto re_arm;
......@@ -2122,9 +2124,8 @@ void bond_3ad_state_machine_handler(struct work_struct *work)
}
re_arm:
rtnl_unlock();
queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
read_unlock(&bond->lock);
}
/**
......
......@@ -1495,11 +1495,13 @@ void bond_alb_monitor(struct work_struct *work)
struct list_head *iter;
struct slave *slave;
read_lock(&bond->lock);
if (!rtnl_trylock())
goto re_arm;
if (!bond_has_slaves(bond)) {
bond_info->tx_rebalance_counter = 0;
bond_info->lp_counter = 0;
rtnl_unlock();
goto re_arm;
}
......@@ -1548,16 +1550,6 @@ void bond_alb_monitor(struct work_struct *work)
if (bond_info->primary_is_promisc &&
(++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
/*
* dev_set_promiscuity requires rtnl and
* nothing else. Avoid race with bond_close.
*/
read_unlock(&bond->lock);
if (!rtnl_trylock()) {
read_lock(&bond->lock);
goto re_arm;
}
bond_info->rlb_promisc_timeout_counter = 0;
/* If the primary was set to promiscuous mode
......@@ -1566,9 +1558,6 @@ void bond_alb_monitor(struct work_struct *work)
*/
dev_set_promiscuity(bond->curr_active_slave->dev, -1);
bond_info->primary_is_promisc = 0;
rtnl_unlock();
read_lock(&bond->lock);
}
if (bond_info->rlb_rebalance) {
......@@ -1591,10 +1580,9 @@ void bond_alb_monitor(struct work_struct *work)
}
}
rtnl_unlock();
re_arm:
queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
read_unlock(&bond->lock);
}
/* assumption: called before the slave is attached to the bond
......
......@@ -2118,49 +2118,29 @@ void bond_mii_monitor(struct work_struct *work)
struct bonding *bond = container_of(work, struct bonding,
mii_work.work);
bool should_notify_peers = false;
unsigned long delay;
read_lock(&bond->lock);
delay = msecs_to_jiffies(bond->params.miimon);
if (!bond_has_slaves(bond))
if (!rtnl_trylock())
goto re_arm;
should_notify_peers = bond_should_notify_peers(bond);
if (bond_miimon_inspect(bond)) {
read_unlock(&bond->lock);
/* Race avoidance with bond_close cancel of workqueue */
if (!rtnl_trylock()) {
read_lock(&bond->lock);
delay = 1;
should_notify_peers = false;
if (!bond_has_slaves(bond)) {
rtnl_unlock();
goto re_arm;
}
read_lock(&bond->lock);
should_notify_peers = bond_should_notify_peers(bond);
if (bond_miimon_inspect(bond))
bond_miimon_commit(bond);
read_unlock(&bond->lock);
rtnl_unlock(); /* might sleep, hold no other locks */
read_lock(&bond->lock);
}
if (should_notify_peers)
call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
rtnl_unlock();
re_arm:
if (bond->params.miimon)
queue_delayed_work(bond->wq, &bond->mii_work, delay);
read_unlock(&bond->lock);
if (should_notify_peers) {
if (!rtnl_trylock())
return;
call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
rtnl_unlock();
}
queue_delayed_work(bond->wq, &bond->mii_work,
msecs_to_jiffies(bond->params.miimon));
}
static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
......@@ -2416,10 +2396,13 @@ void bond_loadbalance_arp_mon(struct work_struct *work)
struct list_head *iter;
int do_failover = 0;
read_lock(&bond->lock);
if (!rtnl_trylock())
goto re_arm;
if (!bond_has_slaves(bond))
if (!bond_has_slaves(bond)) {
rtnl_unlock();
goto re_arm;
}
oldcurrent = bond->curr_active_slave;
/* see if any of the previous devices are up now (i.e. they have
......@@ -2501,13 +2484,12 @@ void bond_loadbalance_arp_mon(struct work_struct *work)
write_unlock_bh(&bond->curr_slave_lock);
unblock_netpoll_tx();
}
rtnl_unlock();
re_arm:
if (bond->params.arp_interval)
queue_delayed_work(bond->wq, &bond->arp_work,
msecs_to_jiffies(bond->params.arp_interval));
read_unlock(&bond->lock);
}
/*
......@@ -2744,51 +2726,31 @@ void bond_activebackup_arp_mon(struct work_struct *work)
struct bonding *bond = container_of(work, struct bonding,
arp_work.work);
bool should_notify_peers = false;
int delta_in_ticks;
read_lock(&bond->lock);
delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
if (!bond_has_slaves(bond))
if (!rtnl_trylock())
goto re_arm;
should_notify_peers = bond_should_notify_peers(bond);
if (bond_ab_arp_inspect(bond)) {
read_unlock(&bond->lock);
/* Race avoidance with bond_close flush of workqueue */
if (!rtnl_trylock()) {
read_lock(&bond->lock);
delta_in_ticks = 1;
should_notify_peers = false;
if (!bond_has_slaves(bond)) {
rtnl_unlock();
goto re_arm;
}
read_lock(&bond->lock);
should_notify_peers = bond_should_notify_peers(bond);
if (bond_ab_arp_inspect(bond))
bond_ab_arp_commit(bond);
read_unlock(&bond->lock);
rtnl_unlock();
read_lock(&bond->lock);
}
bond_ab_arp_probe(bond);
re_arm:
if (bond->params.arp_interval)
queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
read_unlock(&bond->lock);
if (should_notify_peers) {
if (!rtnl_trylock())
return;
if (should_notify_peers)
call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
rtnl_unlock();
}
re_arm:
if (bond->params.arp_interval)
queue_delayed_work(bond->wq, &bond->arp_work,
msecs_to_jiffies(bond->params.arp_interval));
}
/*-------------------------- netdev event handling --------------------------*/
......
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