Journey of a C kernel engineer starting a Rust driver project - KRUMMRICH, Danilo

Introduction

This tutorial outlines the journey of a C kernel engineer transitioning into a Rust driver project, based on insights from Danilo Krummrich at the Linux Plumbers Conference. It aims to provide a step-by-step guide for engineers looking to explore Rust in the context of kernel development, highlighting key considerations, resources, and best practices.

Step 1: Understand the Background

• Familiarize yourself with the Linux kernel architecture and its existing components.
• Review the fundamentals of Rust programming, focusing on its safety features and memory management.
• Explore the advantages of using Rust for kernel development, such as reduced risks of bugs and improved concurrency.

Step 2: Set Up Your Development Environment

• Install Rust and its toolchain:
  • Use the following command to install Rust:

    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
    

  • Follow the on-screen instructions to complete the installation.
• Ensure you have the necessary development tools:
  • Install cargo, Rust's package manager.
  • Set up a code editor or IDE with Rust support (e.g., Visual Studio Code with Rust extension).

Step 3: Create a New Rust Project

• Use Cargo to create a new Rust project:

  cargo new rust_driver_project
  

• Navigate into the project directory:

  cd rust_driver_project
  

Step 4: Integrate with the Linux Kernel

• Review the Linux kernel documentation for guidelines on writing drivers.
• Set up a kernel development environment:
  • Download the Linux kernel source code.
  • Configure the kernel with Rust support (if not already included).
• Understand how to create a Rust-based driver:
  • Define the driver's entry point.
  • Implement necessary kernel interfaces using Rust’s FFI (Foreign Function Interface).

Step 5: Implement Basic Driver Functionality

• Start coding the driver:
  • Use Rust features to define the driver structure and functions.
  • Utilize traits and enums where applicable to enhance code safety and readability.
• Example of defining a simple driver function:

  fn my_driver_function() {
      // Implement driver logic here
  }
  

Step 6: Test and Debug Your Driver

• Compile the driver and address any compilation issues:

  cargo build
  

• Load your driver into the kernel for testing:

  sudo insmod my_driver.ko
  

• Use kernel logs to debug:

  dmesg
  

Step 7: Engage with the Community

• Join Rust and Linux kernel community forums for support and knowledge sharing.
• Attend workshops or conferences focused on Rust development in the kernel space.

Conclusion

Transitioning from C to Rust in kernel development offers numerous benefits, such as improved safety and performance. By following these steps, you can effectively start your own Rust driver project. Remember to leverage community resources and continuously seek feedback to refine your skills. The journey may be challenging, but the rewards of mastering Rust in kernel development are significant.