From: Jon Maxwell Date: Thu, 29 May 2014 07:27:16 +0000 (+1000) Subject: bridge: notify user space after fdb update X-Git-Tag: omap-for-v3.16/fixes-against-rc1~107^2~11 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c65c7a306610ee7c13669a8f5601b472c19dc6f1;p=pandora-kernel.git bridge: notify user space after fdb update 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 Reviewed-by: Jiri Pirko Acked-by: Toshiaki Makita Acked-by: Stephen Hemminger Signed-off-by: David S. Miller --- Reading git-diff-tree failed