i40iw: Add notifier for network device events

Register a netdevice notifier for netdev UP/DOWN
notification events and report the appropriate ib event.
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/i40iw/i40iw.h

@@ -587,5 +587,8 @@ int i40iw_inet6addr_event(struct notifier_block *notifier,
 int i40iw_net_event(struct notifier_block *notifier,
 		    unsigned long event,
 		    void *ptr);
+int i40iw_netdevice_event(struct notifier_block *notifier,
+			  unsigned long event,
+			  void *ptr);
 
 #endif

drivers/infiniband/hw/i40iw/i40iw_main.c

@@ -99,6 +99,10 @@ static struct notifier_block i40iw_net_notifier = {
 	.notifier_call = i40iw_net_event
 };
 
+static struct notifier_block i40iw_netdevice_notifier = {
+	.notifier_call = i40iw_netdevice_event
+};
+
 /**
  * i40iw_find_i40e_handler - find a handler given a client info
  * @ldev: pointer to a client info
@@ -1394,6 +1398,7 @@ static void i40iw_register_notifiers(void)
 	register_inetaddr_notifier(&i40iw_inetaddr_notifier);
 	register_inet6addr_notifier(&i40iw_inetaddr6_notifier);
 	register_netevent_notifier(&i40iw_net_notifier);
+	register_netdevice_notifier(&i40iw_netdevice_notifier);
 }
 
 /**
@@ -1405,6 +1410,7 @@ static void i40iw_unregister_notifiers(void)
 	unregister_netevent_notifier(&i40iw_net_notifier);
 	unregister_inetaddr_notifier(&i40iw_inetaddr_notifier);
 	unregister_inet6addr_notifier(&i40iw_inetaddr6_notifier);
+	unregister_netdevice_notifier(&i40iw_netdevice_notifier);
 }
 
 /**

drivers/infiniband/hw/i40iw/i40iw_utils.c

@@ -137,7 +137,7 @@ inline u32 i40iw_rd32(struct i40iw_hw *hw, u32 reg)
 }
 
 /**
- * i40iw_inetaddr_event - system notifier for netdev events
+ * i40iw_inetaddr_event - system notifier for ipv4 addr events
  * @notfier: not used
  * @event: event for notifier
  * @ptr: if address
@@ -200,7 +200,7 @@ int i40iw_inetaddr_event(struct notifier_block *notifier,
 }
 
 /**
- * i40iw_inet6addr_event - system notifier for ipv6 netdev events
+ * i40iw_inet6addr_event - system notifier for ipv6 addr events
  * @notfier: not used
  * @event: event for notifier
  * @ptr: if address
@@ -252,7 +252,7 @@ int i40iw_inet6addr_event(struct notifier_block *notifier,
 }
 
 /**
- * i40iw_net_event - system notifier for net events
+ * i40iw_net_event - system notifier for netevents
  * @notfier: not used
  * @event: event for notifier
  * @ptr: neighbor
@@ -296,6 +296,50 @@ int i40iw_net_event(struct notifier_block *notifier, unsigned long event, void *
 	return NOTIFY_DONE;
 }
 
+/**
+ * i40iw_netdevice_event - system notifier for netdev events
+ * @notfier: not used
+ * @event: event for notifier
+ * @ptr: netdev
+ */
+int i40iw_netdevice_event(struct notifier_block *notifier,
+			  unsigned long event,
+			  void *ptr)
+{
+	struct net_device *event_netdev;
+	struct net_device *netdev;
+	struct i40iw_device *iwdev;
+	struct i40iw_handler *hdl;
+
+	event_netdev = netdev_notifier_info_to_dev(ptr);
+
+	hdl = i40iw_find_netdev(event_netdev);
+	if (!hdl)
+		return NOTIFY_DONE;
+
+	iwdev = &hdl->device;
+	if (iwdev->init_state < RDMA_DEV_REGISTERED || iwdev->closing)
+		return NOTIFY_DONE;
+
+	netdev = iwdev->ldev->netdev;
+	if (netdev != event_netdev)
+		return NOTIFY_DONE;
+
+	iwdev->iw_status = 1;
+
+	switch (event) {
+	case NETDEV_DOWN:
+		iwdev->iw_status = 0;
+		/* Fall through */
+	case NETDEV_UP:
+		i40iw_port_ibevent(iwdev);
+		break;
+	default:
+		break;
+	}
+	return NOTIFY_DONE;
+}
+
 /**
  * i40iw_get_cqp_request - get cqp struct
  * @cqp: device cqp ptr