From: Martin KaFai Lau <martin.lau@linux.dev>
To: Zhouyi Zhou <zhouzhouyi@gmail.com>,
bpf@vger.kernel.org, linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: a small question about bpftool struct_ops
Date: Fri, 19 May 2023 12:01:09 -0700 [thread overview]
Message-ID: <073cf884-e191-e323-1445-b79c86759557@linux.dev> (raw)
In-Reply-To: <CAABZP2wiPdij+q_Nms08e8KbT9+CgXuoU+MO3dyoujG_1PPHAQ@mail.gmail.com>
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
next prev parent reply other threads:[~2023-05-19 19:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-19 12:07 a small question about bpftool struct_ops Zhouyi Zhou
2023-05-19 19:01 ` Martin KaFai Lau [this message]
2023-05-19 23:37 ` Zhouyi Zhou
2023-05-21 8:27 ` Zhouyi Zhou
2023-05-26 23:10 ` Zhouyi Zhou
2023-05-31 3:14 ` Zhouyi Zhou
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