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Commit 733ab639 authored by dingtianhong's avatar dingtianhong Committed by David S. Miller
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bonding: rebuild the lock use for bond_alb_monitor() 



The bond_alb_monitor use bond lock to protect the bond slave list,
it is no effect here, we need to use RTNL or RCU to replace bond lock,
the bond_alb_monitor will called 10 times one second, RTNL may loss
performance here, so I replace bond lock with RCU to protect the
bond slave list, also the RTNL is preserved, the logic of the monitor
did not changed.

Suggested-by: default avatarNikolay Aleksandrov <nikolay@redhat.com>
Suggested-by: default avatarJay Vosburgh <fubar@us.ibm.com>
Suggested-by: default avatarVeaceslav Falico <vfalico@redhat.com>
Signed-off-by: default avatarDing Tianhong <dingtianhong@huawei.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4cb4f97b

drivers/net/bonding/bond_alb.c

+9 −13
Original line number Diff line number Diff line
@@ -815,7 +815,7 @@ static void rlb_rebalance(struct bonding *bond) 
	for (; hash_index != RLB_NULL_INDEX;

	     hash_index = client_info->used_next) {

		client_info = &(bond_info->rx_hashtbl[hash_index]);

		assigned_slave = rlb_next_rx_slave(bond);

		assigned_slave = __rlb_next_rx_slave(bond);

		if (assigned_slave && (client_info->slave != assigned_slave)) {

			client_info->slave = assigned_slave;

			client_info->ntt = 1;
@@ -1494,14 +1494,14 @@ void bond_alb_monitor(struct work_struct *work) 
	struct list_head *iter;

	struct slave *slave;



	read_lock(&bond->lock);



	if (!bond_has_slaves(bond)) {

		bond_info->tx_rebalance_counter = 0;

		bond_info->lp_counter = 0;

		goto re_arm;

	}



	rcu_read_lock();



	bond_info->tx_rebalance_counter++;

	bond_info->lp_counter++;
@@ -1514,7 +1514,7 @@ void bond_alb_monitor(struct work_struct *work) 
		 */

		read_lock(&bond->curr_slave_lock);



		bond_for_each_slave(bond, slave, iter)

		bond_for_each_slave_rcu(bond, slave, iter)

			alb_send_learning_packets(slave, slave->dev->dev_addr);



		read_unlock(&bond->curr_slave_lock);
@@ -1527,7 +1527,7 @@ void bond_alb_monitor(struct work_struct *work) 


		read_lock(&bond->curr_slave_lock);



		bond_for_each_slave(bond, slave, iter) {

		bond_for_each_slave_rcu(bond, slave, iter) {

			tlb_clear_slave(bond, slave, 1);

			if (slave == bond->curr_active_slave) {

				SLAVE_TLB_INFO(slave).load =
@@ -1551,11 +1551,9 @@ void bond_alb_monitor(struct work_struct *work) 
			 * dev_set_promiscuity requires rtnl and

			 * nothing else.  Avoid race with bond_close.

			 */

			read_unlock(&bond->lock);

			if (!rtnl_trylock()) {

				read_lock(&bond->lock);

			rcu_read_unlock();

			if (!rtnl_trylock())

				goto re_arm;

			}



			bond_info->rlb_promisc_timeout_counter = 0;
@@ -1567,7 +1565,7 @@ void bond_alb_monitor(struct work_struct *work) 
			bond_info->primary_is_promisc = 0;



			rtnl_unlock();

			read_lock(&bond->lock);

			rcu_read_lock();

		}



		if (bond_info->rlb_rebalance) {
@@ -1589,11 +1587,9 @@ void bond_alb_monitor(struct work_struct *work) 
			}

		}

	}



	rcu_read_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