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Date: Wed, 4 Sep 2013 17:44:15 +0800 From: Ding Tianhong <dingtianhong@...wei.com> To: Jay Vosburgh <fubar@...ibm.com>, Andy Gospodarek <andy@...yhouse.net>, "David S. Miller" <davem@...emloft.net>, Nikolay Aleksandrov <nikolay@...hat.com>, Veaceslav Falico <vfalico@...hat.com>, Netdev <netdev@...r.kernel.org> Subject: [PATCH net-next v2 5/6] bonding: restructure and add rcu for bond_for_each_slave_next() Remove the wordy int and add bond_for_each_slave_next_rcu() for future use. Suggested-by: Nikolay Aleksandrov <nikolay@...hat.com> Signed-off-by: Ding Tianhong <dingtianhong@...wei.com> Cc: Nikolay Aleksandrov <nikolay@...hat.com> --- drivers/net/bonding/bond_alb.c | 3 +-- drivers/net/bonding/bond_main.c | 6 ++---- drivers/net/bonding/bonding.h | 30 ++++++++++++++++++++++++++---- 3 files changed, 29 insertions(+), 10 deletions(-) diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c index 91f179d..c75d383 100644 --- a/drivers/net/bonding/bond_alb.c +++ b/drivers/net/bonding/bond_alb.c @@ -383,7 +383,6 @@ static struct slave *rlb_next_rx_slave(struct bonding *bond) { struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); struct slave *rx_slave, *slave, *start_at; - int i = 0; if (bond_info->next_rx_slave) start_at = bond_info->next_rx_slave; @@ -392,7 +391,7 @@ static struct slave *rlb_next_rx_slave(struct bonding *bond) rx_slave = NULL; - bond_for_each_slave_from(bond, slave, i, start_at) { + bond_for_each_slave_from(bond, slave, start_at) { if (SLAVE_IS_OK(slave)) { if (!rx_slave) { rx_slave = slave; diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 39e5b1c..4190389 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -782,7 +782,6 @@ 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 = bond->curr_active_slave; @@ -801,7 +800,7 @@ static struct slave *bond_find_best_slave(struct bonding *bond) /* remember where to stop iterating over the slaves */ old_active = new_active; - bond_for_each_slave_from(bond, new_active, i, old_active) { + bond_for_each_slave_from(bond, new_active, old_active) { if (new_active->link == BOND_LINK_UP) { return new_active; } else if (new_active->link == BOND_LINK_BACK && @@ -2756,7 +2755,6 @@ do_failover: static void bond_ab_arp_probe(struct bonding *bond) { struct slave *slave, *next_slave; - int i; read_lock(&bond->curr_slave_lock); @@ -2788,7 +2786,7 @@ static void bond_ab_arp_probe(struct bonding *bond) /* search for next candidate */ next_slave = bond_next_slave(bond, bond->current_arp_slave); - bond_for_each_slave_from(bond, slave, i, next_slave) { + bond_for_each_slave_from(bond, slave, next_slave) { if (IS_UP(slave->dev)) { slave->link = BOND_LINK_BACK; bond_set_slave_active_flags(slave); diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h index e97eee9..80b170a 100644 --- a/drivers/net/bonding/bonding.h +++ b/drivers/net/bonding/bonding.h @@ -115,18 +115,40 @@ (bond_is_first_slave(bond, pos) ? bond_last_slave_rcu(bond) : \ bond_to_slave_rcu((pos)->list.prev)) +/* Check whether the slave is the only one in bond */ +#define bond_is_only_slave(bond, pos) \ + (((pos)->list.prev == &(bond)->slave_list) && \ + ((pos)->list.next == &(bond)->slave_list)) + /** * bond_for_each_slave_from - iterate the slaves list from a starting point * @bond: the bond holding this list. * @pos: current slave. - * @cnt: counter for max number of moves * @start: starting point. * * Caller must hold bond->lock */ -#define bond_for_each_slave_from(bond, pos, cnt, start) \ - for (cnt = 0, pos = start; pos && cnt < (bond)->slave_cnt; \ - cnt++, pos = bond_next_slave(bond, pos)) +#define bond_for_each_slave_from(bond, pos, start) \ + for (pos = start; pos && (bond_is_only_slave(bond, start) ? \ + &pos->list != &bond->slave_list : \ + &pos->list != &start->list); bond_is_only_slave(bond, start) ? \ + (pos = list_entry(pos->list.next, typeof(*pos), list)) : \ + (pos = bond_next_slave(bond, pos))) + +/** + * bond_for_each_slave_from_rcu - iterate the slaves list from a starting point + * @bond: the bond holding this list. + * @pos: current slave. + * @start: starting point. + * + * Caller must hold rcu_read_lock + */ +#define bond_for_each_slave_from_rcu(bond, pos, start) \ + for (pos = start; pos && (bond_is_only_slave(bond, start) ? \ + &pos->list != &bond->slave_list : \ + &pos->list != &start->list); bond_is_only_slave(bond, start) ? \ + (pos = list_entry_rcu(pos->list.next, typeof(*pos), list)) : \ + (pos = bond_next_slave_rcu(bond, pos))) /** * bond_for_each_slave - iterate over all slaves -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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