In standard IB terms, VL stands for Virtual Lane

the way to specify VL for o2iblnd would be:

1. use the ko2iblnd 'service' option, which indrectly sets the IB SL, i.e. service level
2. configure OpenSM or whatever SM, to map the o2iblnd SL into VL

This has been working for years. LLNL did several talks in LUGs about how to do Lustre QoS on IB which involves using both SL->VL mappings and somethings just use the server IP to distinguish Lustre traffic

The o2iblnd SL is set by the OFED RDMA CM, indirectly based on the o2iblnd service port (set via ko2iblnd option 'service', 987 by default) and its port space (RDMA_PS_TCP).

QoS configuration on Infiniband