bonding: implement bond_poll_controller()

This patches implements the poll_controller support for all
bonding driver. If the slaves have poll_controller net_op defined,
this implementation calls them. This is mode agnostic implementation
and iterates through all slaves (based on mode) and calls respective
handler.

Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 675b082283d64bb7bd6d962516317ac0a565aa82..c026ce9cd7b6f52f1a6bff88b9e6053b13ecebcd 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -928,6 +928,39 @@ static inline void slave_disable_netpoll(struct slave *slave)
 
 static void bond_poll_controller(struct net_device *bond_dev)
 {
+       struct bonding *bond = netdev_priv(bond_dev);
+       struct slave *slave = NULL;
+       struct list_head *iter;
+       struct ad_info ad_info;
+       struct netpoll_info *ni;
+       const struct net_device_ops *ops;
+
+       if (BOND_MODE(bond) == BOND_MODE_8023AD)
+               if (bond_3ad_get_active_agg_info(bond, &ad_info))
+                       return;
+
+       rcu_read_lock_bh();
+       bond_for_each_slave_rcu(bond, slave, iter) {
+               ops = slave->dev->netdev_ops;
+               if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
+                       continue;
+
+               if (BOND_MODE(bond) == BOND_MODE_8023AD) {
+                       struct aggregator *agg =
+                           SLAVE_AD_INFO(slave)->port.aggregator;
+
+                       if (agg &&
+                           agg->aggregator_identifier != ad_info.aggregator_id)
+                               continue;
+               }
+
+               ni = rcu_dereference_bh(slave->dev->npinfo);
+               if (down_trylock(&ni->dev_lock))
+                       continue;
+               ops->ndo_poll_controller(slave->dev);
+               up(&ni->dev_lock);
+       }
+       rcu_read_unlock_bh();
 }
 
 static void bond_netpoll_cleanup(struct net_device *bond_dev)