[ovs-dev] [PATCH] bridge: Eject NORMAL flows from datapath after bridge flush.

[Ben Pfaff]

Jesse Gross <jesse at nicira.com> writes:

> During a bridge flush we clear the learning table and revalidate all
> flows.  When revalidating NORMAL flows we consult the empty learning
> table and install flows that flood packets.  This means that existing
> flows can continue as is but flooding packets because we don't learn
> the MAC addresses as the flows never come to userspace.  The problem
> is worse with bonding because we can receive one of the flooded
> packets back on a bond slave and learn that port, causing us to send
> traffic to the wrong location.

This seems like a reasonable stopgap.  We have the opportunity to
do better:

        - We shouldn't need to flush the bridge in so many cases.

        - We ought to feed flow stats back into the learning
          table.