Comment by eqvinox

InfiniBand is its entire own networking standard, if you have Mellanox NICs you can switch them into IB mode and... short version, it's not Ethernet anymore. It's not even the same speeds/baud rates (e.g. there is a FDR rate at 14.0625Gbaud.) (NB: InfiniBand is indeed not RoCE, that E is Ethernet. InfiniBand had RDMA way before RoCE became a thing; probably why its APIs are being used for it.)

It sounds like you're really just doing the IB verbs (which is kinda really RDMA verbs). I don't think any kind of "bridging" (other than IP routing) is really possible (you'd need a chip that understands both TB and IB and can somehow translate RDMA requests between the two.)