`cb[]` (array of values) is not printed correctly when dumping the full skb about pwru

[jschwinger233]

We'd need to fix bpf_snprintf_btf() to retrieve the content correctly though, if I understand correctly?

True, although it would be long way to go.

[brb]

Maybe as a temp solution we could add skb->cb[] to --output-meta's output if --filter-trace-tc is set? The latter is expected for tracing BPF progs.

[jschwinger233]

Considering that Cilium heavily relies on skb->cb, I can't tolerate this issue any longer!

Do you think it's a good idea to fetch and output skb->cb when --output-meta is set? Or we add a new flag --output-skb-cb? Any suggestion?

The best solution looks like #11, but it requires huge engineering...

[qmonnet]

Not sure what #11 mean, do you mean finding a way to specify what fields from the skb we want to print? An alternative to that would be to output the SKB metadata (possibly the other info, too) in JSON and filter with jq?

Do you think it's a good idea to fetch and output `skb->cb` when --output-meta is set? Or we add a new flag `--output-skb-cb`? Any suggestion?

I personally wouldn't mind printing the skb->cb by default. We'd need to fix bpf_snprintf_btf() to retrieve the content correctly though, if I understand correctly?