d0a97c000f
With multicast chaining, if e.g. a specific multicast filter is inserted and the multicast mis-match filter is then inserted, both may match a packet and cause it to be delivered. Copy the behaviour of the Linux driver, which is to remove the old filters first, on the basis that customers are more likely to be able to handle drops than duplicates (see bug49178 comment 4). Submitted by: Mark Spender <mspender at solarflare.com> Sponsored by: Solarflare Communications, Inc. MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D6331