s390/qeth: advertise IFF_UNICAST_FLT
qeth implements HW-based Unicast Filtering (via SETVMAC) on L2 devices. Tell the stack, so it knows that receiving traffic for secondary addresses doesn't require full-blown promiscuous mode. Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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