cni-server: fix ovn0 gateway check

[zhangzujian]

Pull Request

• [] Make sure you have followed Kube-OVN Code Style.

What type of this PR

Examples of user facing changes:

• Features
• Bug fixes
• Docs
• Tests

Which issue(s) this PR fixes

kube-ovn-cni should restart if ovn0 ipv4 address is missing.

[gemini-code-assist]

Summary of Changes

Hello @zhangzujian, I'm Gemini Code Assist¹! 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 resolves an issue with the ovn0 gateway check by standardizing the naming convention for the network interface and refining the gateway connectivity verification process. The changes ensure that network interface references are consistent throughout the codebase and allow for more flexible and robust gateway readiness assessments.

Highlights

• Refactor Interface Naming: Replaced hardcoded references to the 'ovn0' network interface with the util.NodeNic constant across various logging messages and iptables rules, enhancing maintainability and flexibility.
• Improve Gateway Check Logic: Introduced a new preferARP parameter to the waitNetworkReady function, allowing for conditional ARP resolution during IPv4 gateway connectivity checks. This provides more granular control over how gateway readiness is determined.

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[gemini-code-assist]

Code Review

This pull request introduces a fix for the ovn0 gateway check by adding a preferARP flag to the waitNetworkReady function. This allows for more granular control over gateway checking, specifically disabling ARP checks for the ovn0 interface where it might not be reliable. Additionally, the PR refactors hardcoded instances of the string "ovn0" to use the util.NodeNic constant, improving code maintainability. The changes are logical and well-implemented, though I've pointed out a couple of minor issues with log message formatting in fatal error paths that should be addressed for better debuggability.

[zhangzujian]

/gemini review

[gemini-code-assist]

Code Review

This pull request addresses an issue with the ovn0 gateway check by introducing a preferARP flag to the waitNetworkReady function. This allows forcing a ping-based check instead of an ARP-based one for the ovn0 interface, which seems to be the intended fix. Additionally, the PR refactors the code to replace the hardcoded string "ovn0" with the util.NodeNic constant, which improves code maintainability and readability. The changes are consistent across all modified files and the logic appears sound. Overall, this is a good improvement.