Hi, I was chatting w/ Quentin [0] about how bpftool could: 1. Support a "feature dump" of all supported kfuncs on running kernel 2. Generate vmlinux.h with kfunc prototypes I had another idea this morning so I thought I'd bounce it around on the list in case others had better ones. 3 vague ideas: 1. Add a BTF type tag annotation in __bpf_kfunc macro. This would let bpftool parse BTF to do discovery. It would be fairly clean and straightforward, except that I don't think GCC supports these type tags. So only clang-built-linux would work. 2. Do the same thing as above, except rather than tagging src code, teach pahole about the .BTF_ids section in vmlinux. pahole could then construct BTF with the appropriate type tags. 3. Have the kernel export function prototypes (with no forward decls) in a pseudo fs file. bpftool could then append the contents of this file to the end of the generated vmlinux.h. Unfortunately this would rule out minimized type dumps (IOW only dump dependent types for kfuncs or something). Unless bpftool wants to embed clang-front-end or something like that to parse C. Would appreciate any thoughts. Thanks, Daniel [0]: https://github.com/libbpf/bpftool/issues/98
