Suggestions for Improving the Readability of DeepEP Code

I recently spent some time studying the source code of DeepEP, particularly the cross-node communication execution pipeline—excellent work with high engineering quality, I learned so much from it. However, while reading the code, I encountered some obstacles that took me quite a while to fully understand the author's intent. I’d like to share the issues I faced during my learning process and provide a few improvement suggestions:

1. RDMA Buffer Layout and Operations

I believe that instead of constructing the SymBuffer rdma_recv_num_tokens_mixed object via rdma_buffer_ptr, a simpler and clearer approach would be to define corresponding structs.

2. Lack of Sufficient Annotations

The implementations of get_rdma_clean_meta and get_nvl_clean_meta lack sufficient comments, especially regarding the meaning of the second field in the returned pair.

3. Overly Complex Interface Parameters

The internode_dispatch and internode_combine interfaces have too many parameters, which are then passed almost unchanged in subsequent calls. This not only increases comprehension difficulty but also raises the risk of incorrect parameter passing. A possible solution is to encapsulate them in a struct.

If you agree with these suggestions, I’d be happy to submit a PR to address these points. Thank you!
@LyricZhao @sphish @haswelliris @dzhulgakov @youkaichao @fzyzcjy

Start by reading the implementations of get_rdma_clean_meta and get_nvl_clean_meta, then trace the internode_dispatch and internode_combine interfaces and the RDMA buffer construction around rdma_buffer_ptr. Done means the RDMA layout is clearer, the returned metadata fields are documented, and the complex parameters are safely encapsulated without obscuring the communication pipeline.

Written by the indexing model from the issue text.