From: Greg KH on
2.6.34-stable review patch. If anyone has any objections, please let us know.


From: Ian Campbell <Ian.Campbell(a)>

commit 06c4648d46d1b757d6b9591a86810be79818b60c upstream.

Currently such notifications are only generated when the device comes up or the
address changes. However one use case for these notifications is to enable
faster network recovery after a virtual machine migration (by causing switches
to relearn their MAC tables). A migration appears to the network stack as a
temporary loss of carrier and therefore does not trigger either of the current
conditions. Rather than adding carrier up as a trigger (which can cause issues
when interfaces a flapping) simply add an interface which the driver can use
to explicitly trigger the notification.

Signed-off-by: Ian Campbell <ian.campbell(a)>
Cc: Stephen Hemminger <shemminger(a)>
Cc: Jeremy Fitzhardinge <jeremy(a)>
Cc: David S. Miller <davem(a)>
Cc: netdev(a)
Signed-off-by: David S. Miller <davem(a)>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)>

include/linux/netdevice.h | 2 ++
include/linux/notifier.h | 1 +
net/ipv4/devinet.c | 1 +
net/sched/sch_generic.c | 18 ++++++++++++++++++
4 files changed, 22 insertions(+)

--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1661,6 +1661,8 @@ extern void netif_carrier_on(struct net_

extern void netif_carrier_off(struct net_device *dev);

+extern void netif_notify_peers(struct net_device *dev);
* netif_dormant_on - mark device as dormant.
* @dev: network device
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -203,6 +203,7 @@ static inline int notifier_to_errno(int
#define NETDEV_POST_INIT 0x0010
+#define NETDEV_NOTIFY_PEERS 0x0012

#define SYS_DOWN 0x0001 /* Notify of system down */
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1081,6 +1081,7 @@ static int inetdev_event(struct notifier
/* fall through */
/* Send gratuitous ARP to notify of link change */
if (IN_DEV_ARP_NOTIFY(in_dev)) {
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -325,6 +325,24 @@ void netif_carrier_off(struct net_device

+ * netif_notify_peers - notify network peers about existence of @dev
+ * @dev: network device
+ *
+ * Generate traffic such that interested network peers are aware of
+ * @dev, such as by generating a gratuitous ARP. This may be used when
+ * a device wants to inform the rest of the network about some sort of
+ * reconfiguration such as a failover event or virtual machine
+ * migration.
+ */
+void netif_notify_peers(struct net_device *dev)
+ rtnl_lock();
+ call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
+ rtnl_unlock();
/* "NOOP" scheduler: the best scheduler, recommended for all interfaces
under all circumstances. It is difficult to invent anything faster or

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