From: Jesper Dangaard Brouer <jbrouer@redhat.com>
To: Andrii Nakryiko <andrii@kernel.org>
Cc: brouer@redhat.com, Zaremba Larysa <larysa.zaremba@intel.com>,
Alexei Starovoitov <ast@kernel.org>, bpf <bpf@vger.kernel.org>,
"xdp-hints@xdp-project.net" <xdp-hints@xdp-project.net>
Subject: [xdp-hints] How to extract BTF object ID from kernel module?
Date: Tue, 30 Aug 2022 15:17:29 +0200 [thread overview]
Message-ID: <2c7c8f91-a430-719c-5ef7-174cafa6c0be@redhat.com> (raw)
Hi Andrii,
When opening a modules BTF file (e.g. /sys/kernel/btf/i40e), can I
somehow get the kernels BTF object ID value (via that FD)?
I think I want the BTF object IDs as displayed by 'btftool btf'.
That code walks all IDs via bpf_btf_get_next_id() and then gets the FD
via bpf_btf_get_fd_by_id(). I'm looking for a more direct way than
having to walk all IDs...
(p.s. Cc. Larysa, I also looked at your code, which like bpftool end-up
walking all BTF IDs and extends libbpf with internal btf_obj_id to keep
track).
--Jesper
next reply other threads:[~2022-08-30 13:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-30 13:17 Jesper Dangaard Brouer [this message]
2022-08-31 17:22 ` [xdp-hints] " Jesper Dangaard Brouer
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