Re: a small question about bpftool struct_ops

[Zhouyi Zhou]

Thank you for responding so quickly ;-)

On Sat, May 20, 2023 at 3:01 AM Martin KaFai Lau <martin.lau@xxxxxxxxx> wrote:
>
> On 5/19/23 5:07 AM, Zhouyi Zhou wrote:
> > Dear developers:
> > I compiled bpftool and bpf tests in mainline (2d1bcbc6cd70),
> > but when I invoke:
> > bpftool struct_ops register bpf_cubic.bpf.o
> >
> > the command line fail with:
> > libbpf: struct_ops init_kern: struct tcp_congestion_ops data is not
> > found in struct bpf_struct_ops_tcp_congestion_ops
>
> At the machine trying to register the bpf_cubic, please dump the vmlinux btf and
> search for bpf_struct_ops_tcp_congestion_ops and paste it here:
>
> For example:
> #> bpftool btf dump file /sys/kernel/btf/vmlinux
>
> ...
>
> [74578] STRUCT 'bpf_struct_ops_tcp_congestion_ops' size=256 vlen=3
>          'refcnt' type_id=145 bits_offset=0
>          'state' type_id=74569 bits_offset=32
>          'data' type_id=6241 bits_offset=512
OK
[214398] STRUCT 'bpf_struct_ops_tcp_congestion_ops' size=256 vlen=3
        'refcnt' type_id=298 bits_offset=0
        'state' type_id=214224 bits_offset=32
        'data' type_id=213704 bits_offset=512

Please tell me if I could provide any further information.

You are of great help

Thank you very much
Zhouyi
>