Status of RDMA over Resilient Ethernet

Dear All,

at SIGCOM 2018 Mellanox announced support for RoCEv2 over Resilient Ethernet, with HCA packet drop detection (and out of order handling) ?

there is also this FAQ but no coding procedure is provide.

Introduction to Resilient RoCE - FAQ https://community.mellanox.com/s/article/introduction-to-resilient-roce---faq

how is it possible to use this feature with a Connectx-5 using IBV_SEND over UD (Unreliable Datagram) queue pair ?

thank for your attention