linux-kernel - [PATCH] [34/275] staging: hv: Enable sending GARP packet after live migration

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Message-Id: <20110330210429.7CA053E1A05@tassilo.jf.intel.com>
Date:	Wed, 30 Mar 2011 14:04:29 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	haiyangz@...rosoft.com, hjanssen@...rosoft.com, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com
Subject: [PATCH] [34/275] staging: hv: Enable sending GARP packet after live migration

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Haiyang Zhang <haiyangz@...rosoft.com>

commit 7c161d0b900ea9bd9fc5ea5d3fa9916e9eb0dd88 upstream.

The hv_netvsc gets RNDIS_STATUS_MEDIA_CONNECT event after the VM
is live migrated. Adding call to netif_notify_peers() for this event
to send GARP (Gratuitous ARP) to notify network peers. Otherwise,
the VM's network connection may stop after a live migration.

This patch should also be applied to stable kernel 2.6.32 and later.

Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
Signed-off-by: Hank Janssen <hjanssen@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/staging/hv/netvsc_drv.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6.35.y/drivers/staging/hv/netvsc_drv.c
===================================================================
--- linux-2.6.35.y.orig/drivers/staging/hv/netvsc_drv.c	2011-03-29 22:51:55.255309324 -0700
+++ linux-2.6.35.y/drivers/staging/hv/netvsc_drv.c	2011-03-29 23:02:58.898328360 -0700
@@ -249,6 +249,7 @@
 	if (status == 1) {
 		netif_carrier_on(net);
 		netif_wake_queue(net);
+		netif_notify_peers(net);
 	} else {
 		netif_carrier_off(net);
 		netif_stop_queue(net);
--
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