bonding: allow notifications for bond_set_slave_link_state

Similar to state notifications.

We allow caller to indicate if the notification should happen now or later,
depending on if he holds rtnl mutex or not. Introduce bond_slave_link_notify
function (similar to bond_slave_state_notify) which is later on called
with rtnl mutex and goes over slaves and executes delayed notification.

Signed-off-by: Jiri Pirko <jiri@mellanox.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 e94e79a..7695490 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -830,7 +830,8 @@ void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
                        }
 
                        new_active->delay = 0;
-                       bond_set_slave_link_state(new_active, BOND_LINK_UP);
+                       bond_set_slave_link_state(new_active, BOND_LINK_UP,
+                                                 BOND_SLAVE_NOTIFY_NOW);
 
                        if (BOND_MODE(bond) == BOND_MODE_8023AD)
                                bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
@@ -1580,21 +1581,26 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
                if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
                        if (bond->params.updelay) {
                                bond_set_slave_link_state(new_slave,
-                                                         BOND_LINK_BACK);
+                                                         BOND_LINK_BACK,
+                                                         BOND_SLAVE_NOTIFY_NOW);
                                new_slave->delay = bond->params.updelay;
                        } else {
                                bond_set_slave_link_state(new_slave,
-                                                         BOND_LINK_UP);
+                                                         BOND_LINK_UP,
+                                                         BOND_SLAVE_NOTIFY_NOW);
                        }
                } else {
-                       bond_set_slave_link_state(new_slave, BOND_LINK_DOWN);
+                       bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
+                                                 BOND_SLAVE_NOTIFY_NOW);
                }
        } else if (bond->params.arp_interval) {
                bond_set_slave_link_state(new_slave,
                                          (netif_carrier_ok(slave_dev) ?
-                                         BOND_LINK_UP : BOND_LINK_DOWN));
+                                         BOND_LINK_UP : BOND_LINK_DOWN),
+                                         BOND_SLAVE_NOTIFY_NOW);
        } else {
-               bond_set_slave_link_state(new_slave, BOND_LINK_UP);
+               bond_set_slave_link_state(new_slave, BOND_LINK_UP,
+                                         BOND_SLAVE_NOTIFY_NOW);
        }
 
        if (new_slave->link != BOND_LINK_DOWN)
@@ -2013,7 +2019,8 @@ static int bond_miimon_inspect(struct bonding *bond)
                        if (link_state)
                                continue;
 
-                       bond_set_slave_link_state(slave, BOND_LINK_FAIL);
+                       bond_set_slave_link_state(slave, BOND_LINK_FAIL,
+                                                 BOND_SLAVE_NOTIFY_LATER);
                        slave->delay = bond->params.downdelay;
                        if (slave->delay) {
                                netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
@@ -2028,7 +2035,8 @@ static int bond_miimon_inspect(struct bonding *bond)
                case BOND_LINK_FAIL:
                        if (link_state) {
                                /* recovered before downdelay expired */
-                               bond_set_slave_link_state(slave, BOND_LINK_UP);
+                               bond_set_slave_link_state(slave, BOND_LINK_UP,
+                                                         BOND_SLAVE_NOTIFY_LATER);
                                slave->last_link_up = jiffies;
                                netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
                                            (bond->params.downdelay - slave->delay) *
@@ -2050,7 +2058,8 @@ static int bond_miimon_inspect(struct bonding *bond)
                        if (!link_state)
                                continue;
 
-                       bond_set_slave_link_state(slave, BOND_LINK_BACK);
+                       bond_set_slave_link_state(slave, BOND_LINK_BACK,
+                                                 BOND_SLAVE_NOTIFY_LATER);
                        slave->delay = bond->params.updelay;
 
                        if (slave->delay) {
@@ -2064,7 +2073,8 @@ static int bond_miimon_inspect(struct bonding *bond)
                case BOND_LINK_BACK:
                        if (!link_state) {
                                bond_set_slave_link_state(slave,
-                                                         BOND_LINK_DOWN);
+                                                         BOND_LINK_DOWN,
+                                                         BOND_SLAVE_NOTIFY_LATER);
                                netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
                                            (bond->params.updelay - slave->delay) *
                                            bond->params.miimon,
@@ -2102,7 +2112,8 @@ static void bond_miimon_commit(struct bonding *bond)
                        continue;
 
                case BOND_LINK_UP:
-                       bond_set_slave_link_state(slave, BOND_LINK_UP);
+                       bond_set_slave_link_state(slave, BOND_LINK_UP,
+                                                 BOND_SLAVE_NOTIFY_NOW);
                        slave->last_link_up = jiffies;
 
                        primary = rtnl_dereference(bond->primary_slave);
@@ -2142,7 +2153,8 @@ static void bond_miimon_commit(struct bonding *bond)
                        if (slave->link_failure_count < UINT_MAX)
                                slave->link_failure_count++;
 
-                       bond_set_slave_link_state(slave, BOND_LINK_DOWN);
+                       bond_set_slave_link_state(slave, BOND_LINK_DOWN,
+                                                 BOND_SLAVE_NOTIFY_NOW);
 
                        if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
                            BOND_MODE(bond) == BOND_MODE_8023AD)
@@ -2725,7 +2737,8 @@ static void bond_ab_arp_commit(struct bonding *bond)
                                struct slave *current_arp_slave;
 
                                current_arp_slave = rtnl_dereference(bond->current_arp_slave);
-                               bond_set_slave_link_state(slave, BOND_LINK_UP);
+                               bond_set_slave_link_state(slave, BOND_LINK_UP,
+                                                         BOND_SLAVE_NOTIFY_NOW);
                                if (current_arp_slave) {
                                        bond_set_slave_inactive_flags(
                                                current_arp_slave,
@@ -2748,7 +2761,8 @@ static void bond_ab_arp_commit(struct bonding *bond)
                        if (slave->link_failure_count < UINT_MAX)
                                slave->link_failure_count++;
 
-                       bond_set_slave_link_state(slave, BOND_LINK_DOWN);
+                       bond_set_slave_link_state(slave, BOND_LINK_DOWN,
+                                                 BOND_SLAVE_NOTIFY_NOW);
                        bond_set_slave_inactive_flags(slave,
                                                      BOND_SLAVE_NOTIFY_NOW);
 
@@ -2827,7 +2841,8 @@ static bool bond_ab_arp_probe(struct bonding *bond)
                 * up when it is actually down
                 */
                if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
-                       bond_set_slave_link_state(slave, BOND_LINK_DOWN);
+                       bond_set_slave_link_state(slave, BOND_LINK_DOWN,
+                                                 BOND_SLAVE_NOTIFY_LATER);
                        if (slave->link_failure_count < UINT_MAX)
                                slave->link_failure_count++;
 
@@ -2847,7 +2862,8 @@ static bool bond_ab_arp_probe(struct bonding *bond)
        if (!new_slave)
                goto check_state;
 
-       bond_set_slave_link_state(new_slave, BOND_LINK_BACK);
+       bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
+                                 BOND_SLAVE_NOTIFY_LATER);
        bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
        bond_arp_send_all(bond, new_slave);
        new_slave->last_link_up = jiffies;
@@ -2855,7 +2871,7 @@ static bool bond_ab_arp_probe(struct bonding *bond)
 
 check_state:
        bond_for_each_slave_rcu(bond, slave, iter) {
-               if (slave->should_notify) {
+               if (slave->should_notify || slave->should_notify_link) {
                        should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
                        break;
                }
@@ -2910,8 +2926,10 @@ re_arm:
                if (should_notify_peers)
                        call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
                                                 bond->dev);
-               if (should_notify_rtnl)
+               if (should_notify_rtnl) {
                        bond_slave_state_notify(bond);
+                       bond_slave_link_notify(bond);
+               }
 
                rtnl_unlock();
        }

diff --git a/include/net/bonding.h b/include/net/bonding.h
index c1740a2..1df4377 100644 (file)
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -165,7 +165,8 @@ struct slave {
        u8     backup:1,   /* indicates backup slave. Value corresponds with
                              BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
               inactive:1, /* indicates inactive slave */
-              should_notify:1; /* indicateds whether the state changed */
+              should_notify:1, /* indicates whether the state changed */
+              should_notify_link:1; /* indicates whether the link changed */
        u8     duplex;
        u32    original_mtu;
        u32    link_failure_count;
@@ -504,10 +505,35 @@ static inline bool bond_is_slave_inactive(struct slave *slave)
        return slave->inactive;
 }
 
-static inline void bond_set_slave_link_state(struct slave *slave, int state)
+static inline void bond_set_slave_link_state(struct slave *slave, int state,
+                                            bool notify)
 {
+       if (slave->link == state)
+               return;
+
        slave->link = state;
-       bond_queue_slave_event(slave);
+       if (notify) {
+               bond_queue_slave_event(slave);
+               slave->should_notify_link = 0;
+       } else {
+               if (slave->should_notify_link)
+                       slave->should_notify_link = 0;
+               else
+                       slave->should_notify_link = 1;
+       }
+}
+
+static inline void bond_slave_link_notify(struct bonding *bond)
+{
+       struct list_head *iter;
+       struct slave *tmp;
+
+       bond_for_each_slave(bond, tmp, iter) {
+               if (tmp->should_notify_link) {
+                       bond_queue_slave_event(tmp);
+                       tmp->should_notify_link = 0;
+               }
+       }
 }
 
 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)