UCP/PROTO: Add option to enforce zcopy protocols for early error detection

[tvegas1]

What?

Add UCX_TLS_RMA to list transports to enforce zcopy protocols when found.

Why?

In one-sided operations use-case, users need to understand quickly if system is not operating at full capacity.

How?

For a given proto key, we make sure that at least the protocol of the last size range is a zcopy/offload get or put, where applicable.

• UCX_TLS_RMA=cuda_ipc (similar for rocm_ipc):
  • intra-node zcopy for cuda memory, if cuda_ipc is found on system, inter-node mandated with mnnvl.
• UCX_TLS_RMA=rc_mlx5,dc_mlx5:
  • intra/inter-node zcopy for host and cuda/rocm memory if rc_mlx5/dc_mlx5 exist are found on system, error if they miss any supported gpu memory.
• UCX_TLS_RMA=rc_mlx5,cuda_ipc (similar for rocm_ipc):
  • intra/inter-node zcopy for host and cuda/rocm memory, even without mnnvl.

[guy-ealey-morag]

Remember to update the copyright years of all changed files to 2026