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authorIan Campbell <Ian.Campbell@citrix.com>2010-05-26 04:09:42 +0400
committerDavid S. Miller <davem@davemloft.net>2010-05-31 11:27:44 +0400
commit06c4648d46d1b757d6b9591a86810be79818b60c (patch)
tree96f6e09a23071157d5b446853294b4564155ffee /include
parent3f8dc2362fd43a0adee2f6f05bf1ac4d619675b6 (diff)
downloadlinux-06c4648d46d1b757d6b9591a86810be79818b60c.tar.xz
arp_notify: allow drivers to explicitly request a notification event.
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@citrix.com> Cc: Stephen Hemminger <shemminger@linux-foundation.org> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: David S. Miller <davem@davemloft.net> Cc: netdev@vger.kernel.org Cc: stable@kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/netdevice.h2
-rw-r--r--include/linux/notifier.h1
2 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 40291f375024..a24916156f4e 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1772,6 +1772,8 @@ extern void netif_carrier_on(struct net_device *dev);
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
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index 540703b555cb..22c2abb61974 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -210,6 +210,7 @@ static inline int notifier_to_errno(int ret)
#define NETDEV_POST_INIT 0x0010
#define NETDEV_UNREGISTER_BATCH 0x0011
#define NETDEV_BONDING_DESLAVE 0x0012
+#define NETDEV_NOTIFY_PEERS 0x0012
#define SYS_DOWN 0x0001 /* Notify of system down */
#define SYS_RESTART SYS_DOWN