Comment 7 for bug 1658491

This issue may be fixed by this upstream commit:

commit f60439bc21e3337429838e477903214f5bd8277f
Author: Alexander Duyck <email address hidden>
Date: Thu Aug 11 14:51:56 2016 -0700

    ixgbe: Force VLNCTRL.VFE to be set in all VMDq paths

    When I was adding the code for enabling VLAN promiscuous mode with SR-IOV
    enabled I had inadvertently left the VLNCTRL.VFE bit unchanged as I has
    assumed there was code in another path that was setting it when we enabled
    SR-IOV. This wasn't the case and as a result we were just disabling VLAN
    filtering for all the VFs apparently.

    Also the previous patches were always clearing CFIEN which was always set
    to 0 by the hardware anyway so I am dropping the redundant bit clearing.

    Fixes: 16369564915a ("ixgbe: Add support for VLAN promiscuous with SR-IOV")
    Signed-off-by: Alexander Duyck <email address hidden>
    Tested-by: Andrew Bowers <email address hidden>
    Signed-off-by: Jeff Kirsher <email address hidden>