linux-kernel - Re: [PATCH bpf-next 3/3] bpftool: Display cookie for raw

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Message-ID: <ffd23260-f214-482c-aef0-3fb49dbfa1d0@linux.dev>
Date: Fri, 30 May 2025 01:50:48 +0800
From: Tao Chen <chen.dylane@...ux.dev>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>,
 Martin KaFai Lau <martin.lau@...ux.dev>, Eduard <eddyz87@...il.com>,
 Song Liu <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>,
 John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
 Stanislav Fomichev <sdf@...ichev.me>, Quentin Monnet <qmo@...nel.org>,
 Jiri Olsa <jolsa@...nel.org>, bpf <bpf@...r.kernel.org>,
 LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next 3/3] bpftool: Display cookie for raw_tp link
 probe

在 2025/5/30 01:11, Alexei Starovoitov 写道:
> On Thu, May 29, 2025 at 10:01 AM Tao Chen <chen.dylane@...ux.dev> wrote:
>>
>> Display cookie for raw_tp link probe, in plain mode:
>>
>>   #bpftool link
>>
>> 22: raw_tracepoint  prog 14
>>          tp 'sys_enter'  cookie 23925373020405760
>>          pids test_progs(176)
> 
> Curious number.
> What 0x55000000000000 was used for ?

Yes, no practical in fact, i just ran the selftest case in bpf_cookie.c.
raw_tp_opts.cookie = cookie = 0x55000000000000L;

-- 
Best Regards
Tao Chen