net/core: add NETDEV_BONDING_FAILOVER event

Add NETDEV_BONDING_FAILOVER event to be used in a successive patch
by bonding to announce fail-over for the active-backup mode through the
netdev events notifier chain mechanism. Such an event can be of use for the
RDMA CM (communication manager) to let native RDMA ULPs (eg NFS-RDMA, iSER)
always be aligned with the IP stack, in the sense that they use the same
ports/links as the stack does. More usages can be done to allow monitoring
tools based on netlink events being aware to bonding fail-over.

Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

3 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index f27fd2009334..e92fc839ab1d 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1479,6 +1479,7 @@ extern void		__dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct
 extern void             dev_set_promiscuity(struct net_device *dev, int inc);
 extern void             dev_set_allmulti(struct net_device *dev, int inc);
 extern void             netdev_state_change(struct net_device *dev);
+extern void             netdev_bonding_change(struct net_device *dev);
 extern void             netdev_features_change(struct net_device *dev);
 /* Load a device via the kmod */
 extern void             dev_load(struct net *net, const char *name);
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index 0ff6224d172a..bd3d72ddf333 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -197,6 +197,7 @@ static inline int notifier_to_errno(int ret)
 #define NETDEV_GOING_DOWN       0x0009
 #define NETDEV_CHANGENAME       0x000A
 #define NETDEV_FEAT_CHANGE      0x000B
+#define NETDEV_BONDING_FAILOVER 0x000C
 
 #define SYS_DOWN        0x0001  /* Notify of system down */
 #define SYS_RESTART     SYS_DOWN
diff --git a/net/core/dev.c b/net/core/dev.c
index 68d8df0992ab..0e45742e7158 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -961,6 +961,12 @@ void netdev_state_change(struct net_device *dev)
         }
 }
 
+void netdev_bonding_change(struct net_device *dev)
+{
+        call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, dev);
+}
+EXPORT_SYMBOL(netdev_bonding_change);
+
 /**
  *      dev_load        - load a network module
  *      @net: the applicable net namespace