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>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index f27fd2009334922325866c69d2abe42bb45bfd67..e92fc839ab1d9874114d2781f7eab9176c9405ba 100644 (file)
--- 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 0ff6224d172a90c4a9dd8122c6b9358e129f53cf..bd3d72ddf33398254a503fdbc8709e3cbccdc19e 100644 (file)
--- 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 68d8df0992abfd425c517fc8b9df3d6a40fe71ff..0e45742e7158f719d5106ded650d60bff9a5cc6e 100644 (file)
--- 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