netdev - [RFC v2 PATCH 1/3] net/core: add NETDEV_BONDING

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Message-ID: <Pine.LNX.4.64.0806021342120.31515@zuben.voltaire.com>
Date:	Mon, 2 Jun 2008 13:42:52 +0300 (IDT)
From:	Or Gerlitz <ogerlitz@...taire.com>
To:	Jay Vosburgh <fubar@...ibm.com>
cc:	Jeff Garzik <jgarzik@...ox.com>, netdev@...r.kernel.org
Subject: [RFC v2 PATCH 1/3] 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@...taire.com>

 include/linux/netdevice.h |    1 +
 include/linux/notifier.h  |    1 +
 net/core/dev.c            |    6 ++++++
 3 files changed, 8 insertions(+)

- changes from v1
 * removed the event delivery to a separate patch as of the locking change

Index: netdev-2.6/include/linux/notifier.h
===================================================================
--- netdev-2.6.orig/include/linux/notifier.h	2008-06-02 08:33:18.000000000 +0300
+++ netdev-2.6/include/linux/notifier.h	2008-06-02 09:24:44.000000000 +0300
@@ -197,6 +197,7 @@ static inline int notifier_to_errno(int
 #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
Index: netdev-2.6/include/linux/netdevice.h
===================================================================
--- netdev-2.6.orig/include/linux/netdevice.h	2008-06-02 08:33:17.000000000 +0300
+++ netdev-2.6/include/linux/netdevice.h	2008-06-02 09:24:44.000000000 +0300
@@ -1479,6 +1479,7 @@ extern void		__dev_addr_unsync(struct de
 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);
Index: netdev-2.6/net/core/dev.c
===================================================================
--- netdev-2.6.orig/net/core/dev.c	2008-06-02 08:33:19.000000000 +0300
+++ netdev-2.6/net/core/dev.c	2008-06-02 09:24:44.000000000 +0300
@@ -960,6 +960,12 @@ void netdev_state_change(struct net_devi
 	}
 }

+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
--
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