Edit the /etc/opa-fm/opafm.xml configuration file to set the following within the <FM> (or appropriate <Common>) section:

<!-- LID Mask Control: 2^N LIDs per HFI port.
     For SR-IOV with 7 VFs: set to 3 (2^3 = 8 LIDs = 1 PF + 7 VFs). -->
<Lmc>3</Lmc>

<!-- Enable SR-IOV-aware LID assignment mode. -->
<SrIov>1</SrIov>

Restart the Fabric Manager service for changes to take effect. Multiple LIDs will be assigned to a single SuperNIC port. One LID for the PF and up to 7 for VFs.