net: add possibility to pass information about upper device via notifier

Sometimes the drivers and other code would find it handy to know some
internal information about upper device being changed. So allow upper-code
to pass information down to notifier listeners during linking.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

8 files changed, 15 insertions, 11 deletions

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 9240157..fa3ed1d 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1204,7 +1204,7 @@ static int bond_master_upper_dev_link(struct net_device *bond_dev,
 {
 	int err;
 
-	err = netdev_master_upper_dev_link(slave_dev, bond_dev, slave);
+	err = netdev_master_upper_dev_link(slave_dev, bond_dev, slave, NULL);
 	if (err)
 		return err;
 	slave_dev->flags |= IFF_SLAVE;
diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index b37f8d1..f7b6ff7 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -1083,7 +1083,7 @@ static int team_upper_dev_link(struct net_device *dev,
 {
 	int err;
 
-	err = netdev_master_upper_dev_link(port_dev, dev, NULL);
+	err = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL);
 	if (err)
 		return err;
 	port_dev->priv_flags |= IFF_TEAM_PORT;
diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 59c5bdd..8944a49 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -624,7 +624,7 @@ static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
 		goto out_fail;
 	}
 
-	ret = netdev_master_upper_dev_link(port_dev, dev, NULL);
+	ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL);
 	if (ret < 0)
 		goto out_unregister;
 
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 939b8f3..aea556c 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2163,6 +2163,7 @@ struct netdev_notifier_changeupper_info {
 	struct net_device *upper_dev; /* new upper dev */
 	bool master; /* is upper dev master */
 	bool linking; /* is the nofication for link or unlink */
+	void *upper_info; /* upper dev info */
 };
 
 static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
@@ -3620,7 +3621,7 @@ struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev);
 int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev);
 int netdev_master_upper_dev_link(struct net_device *dev,
 				 struct net_device *upper_dev,
-				 void *upper_priv);
+				 void *upper_priv, void *upper_info);
 void netdev_upper_dev_unlink(struct net_device *dev,
 			     struct net_device *upper_dev);
 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index a7f4f10..aa8867e 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -465,7 +465,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 	bat_priv = netdev_priv(hard_iface->soft_iface);
 
 	ret = netdev_master_upper_dev_link(hard_iface->net_dev,
-					   soft_iface, NULL);
+					   soft_iface, NULL, NULL);
 	if (ret)
 		goto err_dev;
 
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 781abc34..8d1d4a2 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -493,7 +493,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
 
 	dev->priv_flags |= IFF_BRIDGE_PORT;
 
-	err = netdev_master_upper_dev_link(dev, br->dev, NULL);
+	err = netdev_master_upper_dev_link(dev, br->dev, NULL, NULL);
 	if (err)
 		goto err5;
 
diff --git a/net/core/dev.c b/net/core/dev.c
index 27d052b..8ed8866 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5421,7 +5421,7 @@ static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev,
 
 static int __netdev_upper_dev_link(struct net_device *dev,
 				   struct net_device *upper_dev, bool master,
-				   void *upper_priv)
+				   void *upper_priv, void *upper_info)
 {
 	struct netdev_notifier_changeupper_info changeupper_info;
 	struct netdev_adjacent *i, *j, *to_i, *to_j;
@@ -5445,6 +5445,7 @@ static int __netdev_upper_dev_link(struct net_device *dev,
 	changeupper_info.upper_dev = upper_dev;
 	changeupper_info.master = master;
 	changeupper_info.linking = true;
+	changeupper_info.upper_info = upper_info;
 
 	ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev,
 					    &changeupper_info.info);
@@ -5549,7 +5550,7 @@ rollback_mesh:
 int netdev_upper_dev_link(struct net_device *dev,
 			  struct net_device *upper_dev)
 {
-	return __netdev_upper_dev_link(dev, upper_dev, false, NULL);
+	return __netdev_upper_dev_link(dev, upper_dev, false, NULL, NULL);
 }
 EXPORT_SYMBOL(netdev_upper_dev_link);
 
@@ -5558,6 +5559,7 @@ EXPORT_SYMBOL(netdev_upper_dev_link);
  * @dev: device
  * @upper_dev: new upper device
  * @upper_priv: upper device private
+ * @upper_info: upper info to be passed down via notifier
  *
  * Adds a link to device which is upper to this one. In this case, only
  * one master upper device can be linked, although other non-master devices
@@ -5567,9 +5569,10 @@ EXPORT_SYMBOL(netdev_upper_dev_link);
  */
 int netdev_master_upper_dev_link(struct net_device *dev,
 				 struct net_device *upper_dev,
-				 void *upper_priv)
+				 void *upper_priv, void *upper_info)
 {
-	return __netdev_upper_dev_link(dev, upper_dev, true, upper_priv);
+	return __netdev_upper_dev_link(dev, upper_dev, true,
+				       upper_priv, upper_info);
 }
 EXPORT_SYMBOL(netdev_master_upper_dev_link);
 
diff --git a/net/openvswitch/vport-netdev.c b/net/openvswitch/vport-netdev.c
index 3ee3df1..8f4dd4c 100644
--- a/net/openvswitch/vport-netdev.c
+++ b/net/openvswitch/vport-netdev.c
@@ -105,7 +105,7 @@ struct vport *ovs_netdev_link(struct vport *vport, const char *name)
 
 	rtnl_lock();
 	err = netdev_master_upper_dev_link(vport->dev,
-					   get_dpdev(vport->dp), NULL);
+					   get_dpdev(vport->dp), NULL, NULL);
 	if (err)
 		goto error_unlock;