enabling kubespan

[bitnik]

As mentioned in the documentation enabling kubespan doesn't work.

When I enabled it via enable_kube_span, I see the following error in cilium pods:

time="2024-10-30T11:52:04Z" level=fatal msg="Failed to compile XDP program" error="attaching XDP program to interface kubespan: interface kubespan: attaching program cil_xdp_entry using bpf_link: create link: operation not supported" subsys=datapath-loader

Looking at the cilium chart values, I saw that XDP program is mentioned in loadBalancer.acceleration settings, which is set to "native" here.

terraform-hcloud-talos/manifest_cilium.tf

Lines 35 to 38 in 15d8090

	set {
	name = "loadBalancer.acceleration"
	value = "native"
	}

So after I set it to "disabled" (do not use XDP), kubespan worked. I guess it should also work with "best-effordt.

TBH I don't really know what this settings is for. I just wanted to share what I have found out.

[mrclrchtr]

Thank you for sharing. This is definitely interesting. KubeSpan did not work, even without setting Cilium to native. We introduced the native setting here later: #34

That means something else must have changed in addition.

As described in the linked ticket, native is probably more important than KubeSpan. But it is worth including this information in the docs. I'll do that when I find the time.