netdev - Re: [PATCH] arp_notify: unconditionally send gratuitous ARP for NETDEV_NOTIFY

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Date:	Mon, 14 Feb 2011 17:46:54 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	ian.campbell@...rix.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] arp_notify: unconditionally send gratuitous ARP for
 NETDEV_NOTIFY_PEERS.

From: Ian Campbell <ian.campbell@...rix.com>
Date: Fri, 11 Feb 2011 17:44:16 +0000

> NETDEV_NOTIFY_PEER is an explicit request by the driver to send a link
> notification while NETDEV_UP/NETDEV_CHANGEADDR generate link
> notifications as a sort of side effect.
> 
> In the later cases the sysctl option is present because link
> notification events can have undesired effects e.g. if the link is
> flapping. I don't think this applies in the case of an explicit
> request from a driver.
> 
> This patch makes NETDEV_NOTIFY_PEER unconditional, if preferred we
> could add a new sysctl for this case which defaults to on.
> 
> This change causes Xen post-migration ARP notifications (which cause
> switches to relearn their MAC tables etc) to be sent by default.
> 
> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>

Ok, applied, thanks.
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