Mellanox said doesn't capable DPDP capability on OFED 1.8.1.
I think that is very curious.
OFED 1.8.1 can support Multi virtual vHBA function for SRP Initiator each IB port up to 8 vHBA.
But IPoIB was not on vSphere 5.x.
I'll wait to launch next release OFED for vSphere....