1. fix u2o cause metallb underlay err

[changluyi]

2. fix underlay metallb ipv6 err

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

Fixes #(issue-number)

[gemini-code-assist]

Summary of Changes

Hello @changluyi, 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 delivers crucial bug fixes and enhancements to improve the stability and compatibility of MetalLB within an underlay network, especially when integrated with U2O interconnection and handling IPv6 traffic. The changes ensure proper IPv6 address representation in load balancer backends, enable dynamic updates for U2O MAC changes, and expand testing capabilities for diverse IP configurations. These updates collectively contribute to a more robust external load balancing solution.

Highlights

• MetalLB Underlay Fixes: Resolved issues causing MetalLB underlay errors, particularly when U2O (Underlay-to-Overlay) interconnection is enabled and dealing with IPv6 addresses.
• IPv6 Address Formatting: Implemented correct formatting for IPv6 addresses in load balancer backend configurations within OVN, ensuring they are enclosed in square brackets (e.g., [::1]:80) to prevent parsing ambiguities.
• Dynamic U2O Interconnection MAC Handling: Introduced logic to detect and react to changes in a subnet's U2O interconnection MAC address, triggering a re-sync of affected services to ensure correct traffic routing for external load balancers.
• Enhanced Kind Testing Targets: Added new kind Makefile targets to facilitate testing of MetalLB pools with IPv6 and dual-stack configurations, improving the robustness of the testing environment.
• Graceful patch-localnet Port Handling: Modified the flow cache update mechanism to gracefully handle scenarios where the patch-localnet port is not found, logging a debug message instead of returning an error, which is common when no pods are present on a node.

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/build-x86-image.yaml

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[gemini-code-assist]

Code Review

This pull request introduces several fixes and improvements related to MetalLB in underlay network configurations, particularly for Underlay-to-Overlay (U2O) and IPv6 scenarios. Key changes include correctly formatting IPv6 backend addresses for OVN load balancers, dynamically handling U2O interconnection MAC address changes to ensure correct traffic routing, and improving the robustness of flow rule creation on nodes without pods. Additionally, new Makefile targets have been added to facilitate testing IPv6 and dual-stack underlay setups. My review identifies a minor redundancy in the logic for handling MAC address changes, which can be simplified for better code clarity.

[gemini-code-assist]

This check is redundant. The preceding check if oldMAC == newMAC on line 235 already handles the case where both MAC addresses are empty strings. Removing this block will make the code slightly cleaner and more concise.

[coveralls]

Pull Request Test Coverage Report for Build 21055024629

Details

• 0 of 62 (0.0%) changed or added relevant lines in 3 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.02%) to 21.401%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/daemon/flow_rules_linux.go	0	2	0.0%
pkg/controller/endpoint_slice.go	0	5	0.0%
pkg/daemon/controller_linux.go	0	55	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/daemon/controller_linux.go	1	0.0%
pkg/daemon/flow_rules_linux.go	1	0.0%

Totals
Change from base Build 21054498978:	-0.02%
Covered Lines:	10635
Relevant Lines:	49695

---

💛 - Coveralls