elf_reader: support value BTF on ringbuf and perf array maps #1628
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While reviewing cilium#1610, I noticed we were generating VariableSpecs for variables named 'unused' in our examples. There had to be a better way to get their BTF info into the ELF. I thoroughly checked all map types present in Linux 6.12 for any validation code on attr->value_size, and only RingBuf and Arena maps require value_size to be zero at all times. Special-case PerfEventArray so type annotations aren't limited to 4 bytes. Signed-off-by: Timo Beckers <timo@isovalent.com>
…rmation This obviates the need for declaring these unused variables, which would otherwise get included in bpf2go-generated Go code in a follow-up commit. Signed-off-by: Timo Beckers <timo@isovalent.com>
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cc @smagnani96 This should clean up the bpf2go output a bit. I'll rebase your PR when this is merged.