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>

1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 675b082283d6..c026ce9cd7b6 100644
--- 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)