From: Jiri Pirko <jiri@resnulli.us>
To: Jiri Olsa <olsajiri@gmail.com>
Cc: bpf@vger.kernel.org
Subject: Re: kfunc use newbie question
Date: Mon, 30 Oct 2023 12:02:13 +0100 [thread overview]
Message-ID: <ZT+NNS1kgBRdfZnW@nanopsycho> (raw)
In-Reply-To: <ZT+CG0cWnko5AIO8@krava>
Mon, Oct 30, 2023 at 11:14:51AM CET, olsajiri@gmail.com 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
>
>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
>>
next prev parent reply other threads:[~2023-10-30 11:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-30 9:35 kfunc use newbie question Jiri Pirko
2023-10-30 10:14 ` Jiri Olsa
2023-10-30 11:02 ` Jiri Pirko [this message]
2023-10-30 13:19 ` Jiri Olsa
2023-10-30 13:45 ` Jiri Pirko
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