Please use this patch. My bad, the previous one incorrectly did the notify before fdb->added_by_user = 1.
----- Original Message ----- > From: "Jon Maxwell" <[email protected]> > To: [email protected] > Cc: [email protected], "makita toshiaki" <[email protected]>, > [email protected], > [email protected], [email protected], > [email protected], [email protected], > [email protected], "Jon Maxwell" <[email protected]> > Sent: Friday, May 16, 2014 6:08:39 PM > Subject: [PATCH net] bridge: notify user space of fdb port change > > From: Jon Maxwell <[email protected]> > > 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 to identify such port toggling. > > Signed-off-by: Jon Maxwell <[email protected]> > --- > net/bridge/br_fdb.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c > index 9203d5a..67480c2 100644 > --- a/net/bridge/br_fdb.c > +++ b/net/bridge/br_fdb.c > @@ -511,6 +511,8 @@ void br_fdb_update(struct net_bridge *br, struct > net_bridge_port *source, > fdb->updated = jiffies; > if (unlikely(added_by_user)) > fdb->added_by_user = 1; > + if (unlikely(source->port_no != fdb->dst->port_no)) > + fdb_notify(br, fdb, RTM_NEWNEIGH); > } > } else { > spin_lock(&br->hash_lock); > -- > 1.8.3.1 > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
