I was able to unit test this driver change. The test included transmit of 
packets with 5 different multicast DMACs paired with several multicast MAC 
configurations:
  1) "ip maddr show oob_net0" shows 2 multicast MACs
  2) 3 multicast MACs
  3) 4 multicast MACs (which puts interface into ALLMULTI mode)
on the oob_net0 interface. 

This test passed as expected.  For #1 and #2, only packets with
configured multicast DMAC pass the receive filter.  And for #3, packets
with any multicast DMAC pass the receive filter.

Alessio - The fix looks good to me.

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https://bugs.launchpad.net/bugs/2151223

Title:
  mlxbf_gige: interface defaults to ALLMULTI mode

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