Hi, I'm trying to send data from an embedded device to a Mellanox ConnectX-5 without the RDMA connection manager (libibverbs only) using RoCEv2. In Annex 17 (RoCE v2) page 21 it implies both transmitted packets (eg SEND FIRST/MIDDLE/LAST) and receiver packets (ACK/NACK) must have the same UDP source port: "Consequently, RoCEv2 endnodes set this field so that packets in a sequence that has ordering constraints (e.g. packets from a connected QP) will all carry a constant value." It's unclear whether this is a strict protocol requirement but I'm trying to access/control that parameter that the card selects to transmit ACK packets to the sender. Is there a way to do that from libibverbs ? Thanks Dimitris
