bonding: add netlink attributes to slave link dev

If link is IFF_SLAVE, extend link dev netlink attributes to include
slave attributes with new IFLA_SLAVE nest.  Add netlink notification
(RTM_NEWLINK) when slave status changes from backup to active, or
visa-versa.

Adds new ndo_get_slave op to net_device_ops to fill skb with IFLA_SLAVE
attributes.  Currently only used by bonding driver, but could be
used by other aggregating devices with slaves.

Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index e985231fe04b..83ce2aee65e6 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -921,6 +921,9 @@ struct netdev_phys_port_id {
  * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
  *      Called to release previously enslaved netdev.
  *
+ * int (*ndo_get_slave)(struct net_device *slave_dev, struct sk_buff *skb);
+ *      Called to fill netlink skb with slave info.
+ *
  *      Feature/offload setting functions.
  * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
  *              netdev_features_t features);
@@ -1093,6 +1096,8 @@ struct net_device_ops {
                                                  struct net_device *slave_dev);
         int                     (*ndo_del_slave)(struct net_device *dev,
                                                  struct net_device *slave_dev);
+        int                     (*ndo_get_slave)(struct net_device *slave_dev,
+                                                 struct sk_buff *skb);
         netdev_features_t       (*ndo_fix_features)(struct net_device *dev,
                                                     netdev_features_t features);
         int                     (*ndo_set_features)(struct net_device *dev,