linux-kernel - a small question about bpftool struct

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Message-ID: <CAABZP2wiPdij+q_Nms08e8KbT9+CgXuoU+MO3dyoujG_1PPHAQ@mail.gmail.com>
Date:   Fri, 19 May 2023 20:07:58 +0800
From:   Zhouyi Zhou <zhouzhouyi@...il.com>
To:     bpf@...r.kernel.org, linux-kernel <linux-kernel@...r.kernel.org>
Subject: a small question about bpftool struct_ops

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
libbpf: failed to load object 'bpf_cubic.bpf.o'

The host OS I used to compile the kernel and bpf is Ubuntu 23.04, the
guest OS that I run bpftool is Ubuntu 22.04.
I have stumbled on this for several days, could you help me by guidance my way?

Thanks in advance
Zhouyi