adapt 6.6

[lec-bit]

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What this PR does / why we need it:

Which issue(s) this PR fixes: Fixes #

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[kmesh-bot]

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[gemini-code-assist[bot]]

Summary of Changes

Hello @lec-bit, 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 significantly refactors the Kmesh eBPF and kernel module components to enhance compatibility with newer Linux kernels, particularly version 6.x. The core change involves integrating BPF kfuncs for key operations like header parsing and socket option handling, which allows eBPF programs to directly call kernel functions. This adaptation simplifies the codebase by removing older, kernel-specific conditional logic, such as that for openEuler-23.03, and introduces a more robust mechanism for kernel feature detection. The changes also include updates to generated eBPF Go bindings and the Kmesh kernel module's build and initialization processes to support this new kfunc-based architecture.

Highlights

• BPF kfunc Integration: Introduced BPF kfuncs for header parsing and socket option manipulation, enabling direct kernel function calls from eBPF programs on compatible kernels (Linux 6.x and above with BTF support). This includes new kfunc declarations and wrapper functions like bpf_km_setsockopt and bpf_km_getsockopt.
• Kernel Version Adaptation: Removed specific compatibility layers related to openEuler-23.03 (OE_23_03 macro and associated conditional code), streamlining the codebase for broader and more generalized kernel compatibility.
• eBPF Program Generation Updates: Updated bpf2go generated Go files to reflect changes in eBPF map and program definitions. This includes the addition of new kmeshcgroupsock related files for enhanced kernel support and the removal of rate-limiting maps in favor of a KmRouterconfig map in normal kernel builds.
• Kernel Module Refactoring: Refactored the Kmesh kernel module to initialize and utilize the new kfunc infrastructure. This involved making previously static helper functions globally accessible or exposed as kfuncs, and integrating kmesh_func_init/exit calls into the module's lifecycle.

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In kernel's heart, new kfuncs bloom, Old paths now fade, dispelling gloom. With BTF's light, a clearer way, Code adapts, for a brighter day.

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[codecov[bot]]

Codecov Report

:x: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 37.84%. Comparing base (fe941b3) to head (146b50e). :warning: Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/controller/controller.go	0.00%	2 Missing :warning:

:x: Your patch check has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Files with missing lines	Coverage Δ
pkg/controller/controller.go	0.00% <0.00%> (ø)

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