netdev - Re: [PATCH net] bridge: notify user space after fdb update

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Date:	Thu, 29 May 2014 09:55:39 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Jon Maxwell <jmaxwell37@...il.com>
Cc:	stephen@...workplumber.org, davem@...emloft.net,
	makita.toshiaki@....ntt.co.jp, vyasevic@...hat.com,
	bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, jpirko@...hat.com,
	jmaxwell@...hat.com
Subject: Re: [PATCH net] bridge: notify user space after fdb update

Thu, May 29, 2014 at 09:27:16AM CEST, jmaxwell37@...il.com wrote:
>There has been a number incidents recently where customers running KVM have
>reported that VM hosts on different Hypervisors are unreachable. Based on
>pcap traces we found that the bridge was broadcasting the ARP request out
>onto the network. However some NICs have an inbuilt switch which on occasions
>were broadcasting the VMs ARP request back through the physical NIC on the
>Hypervisor. This resulted in the bridge changing ports and incorrectly learning
>that the VMs mac address was external. As a result the ARP reply was directed
>back onto the external network and VM never updated it's ARP cache. This patch
>will notify the bridge command, after a fdb has been updated to identify such
>port toggling.
>
>Signed-off-by: Jon Maxwell <jmaxwell37@...il.com>

Reviewed-by: Jiri Pirko <jiri@...nulli.us>

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