Walkthrough

Adds a ZE (Level Zero) GPUDirect RDMA driver presence check (guarded by #if HAVE_ZE) into IB MD initialization and includes UCS_MEMORY_TYPE_HOST in ZE copy MD's reported access_mem_types. Also appends an author entry to AUTHORS.

Changes

Sequence Diagram(s)

sequenceDiagram
  participant Init as uct_ib_md_open_common()
  participant KFD as ROCm KFD probe
  participant ZE as ZE GPUDirect probe (new)
  participant DMB as DMA-BUF/module checks
  Note over Init: IB MD init sequence (high-level)
  Init->>KFD: probe ROCm KFD
  KFD-->>Init: result
  alt HAVE_ZE
    Init->>ZE: probe ZE GPUDirect driver
    ZE-->>Init: result (may set GPUDIRECT_RDMA)
  end
  Init->>DMB: continue DMA-BUF/module checks
  DMB-->>Init: continue initialization

sequenceDiagram
  participant Query as uct_ze_copy_md_query()
  participant Attr as md_attr
  Note over Query: build access_mem_types mask
  Query->>Attr: set = ZE_HOST | ZE_DEVICE | ZE_MANAGED | HOST
  Attr-->>Query: return md attributes

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Localized, small edits across three files.
• Review focus:
  • Correct #if HAVE_ZE placement and probe error handling in ib_md.c.
  • Confirm memory-type semantics after adding UCS_MEMORY_TYPE_HOST in ze_copy_md.c.
  • Verify AUTHORS formatting/location.

Poem

🐇 I sniffed the kernel, peeped where ZE might hide,
A guarded check hopped in, just tucked inside.
Host joined device and managed in a cheerful throng,
New name in the list — a brief, glad song. 🥕

Pre-merge checks and finishing touches

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