On Mon, Oct 30, 2023 at 12:02:13PM +0100, Jiri Pirko wrote: > Mon, Oct 30, 2023 at 11:14:51AM CET, olsajiri@xxxxxxxxx wrote: > >On Mon, Oct 30, 2023 at 10:35:59AM +0100, Jiri Pirko wrote: > >> Hi BPF :) > >> > >> I'm trying to use bpf_dynptr_from_skb() kfunc in my program. I compiled > >> it with having following declaration in the bpf .c file: > >> extern int bpf_dynptr_from_skb(struct __sk_buff *skb, __u64 flags, > >> struct bpf_dynptr *ptr__uninit) __ksym; > >> > >> I have all "BPF/BTF" kernel config options on. During load, > >> I'm still getting: > >> > >> libbpf: failed to find BTF for extern 'bpf_dynptr_from_skb': -3 > > > >heya, > >error -3 suggests there's no BTF generated, is there .BTF section > >in the object ? did you compile with -g ? > > w/o -g. If I compile with -g, I'm getting this: > libbpf: failed to find valid kernel BTF > libbpf: Error loading vmlinux BTF: -3 hum, this one seems straightforward missing vmlinux btf, (check btf__load_vmlinux_btf in tools/lib/bpf/btf.c) could you please send your .config? jirka > > > > > >jirka > > > >> > >> I'm pretty much clueless about what may be wrong. Documentation didn't > >> help me either :/ > >> > >> Any idea what I may be doing wrong? > >> > >> Thanks > >> > >> Jiri > >>
