add heterogeneous-tcp

[AscendTransport]

Description

Type of Change

• Types
  • [ ] Bug fix
  • [ ] New feature
    • [x] Transfer Engine
    • [ ] Mooncake Store
    • [ ] Mooncake EP
    • [ ] Integration
    • [ ] P2P Store
    • [ ] Python Wheel
  • [ ] Breaking change
  • [ ] CI/CD
  • [ ] Documentation update
  • [ ] Other

How Has This Been Tested?

Checklist

• [x] I have performed a self-review of my own code.
• [x] I have updated the documentation.
• [x] I have added tests to prove my changes are effective.

[gemini-code-assist[bot]]

Summary of Changes

Hello @AscendTransport, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the mooncake transfer engine by introducing a new HeterogeneousTcpTransport layer. This addition enables efficient data transfer between Ascend NPUs and GPUs over TCP, complementing existing transport methods. The changes involve updating the build configuration, integrating the new transport into the multi-transport system, and implementing the necessary memory management and transfer logic for the TCP-based heterogeneous communication.

Highlights

• New Heterogeneous TCP Transport: Introduced HeterogeneousTcpTransport to facilitate data transfer between Ascend NPUs and GPUs using TCP.
• Build System Integration: Added a new CMake option USE_ASCEND_HETEROGENEOUS_TCP and integrated it into the build system for conditional compilation and linking.
• Transfer Engine Updates: Modified the core TransferEngine and MultiTransport components to recognize and utilize the new TCP-based heterogeneous transport.
• Memory Management for Transfers: Implemented mechanisms within HeterogeneousTcpTransport for managing host and device memory, including asynchronous memory copies, to optimize data movement.

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