linux-kernel - Re: [PATCH bpf-next v3 1/2] bpf: add bpf_strcasestr,bpf

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Message-ID: <CAADnVQJFBR5ecewWdDhTqyXTMWH_QVEPCm2PXxV_3j1wa+tWMQ@mail.gmail.com>
Date: Mon, 6 Oct 2025 21:08:49 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Rong Tao <rtoax@...mail.com>
Cc: Viktor Malik <vmalik@...hat.com>, Alexei Starovoitov <ast@...nel.org>, Eduard <eddyz87@...il.com>, 
	Rong Tao <rongtao@...tc.cn>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, 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>, Hao Luo <haoluo@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, Shuah Khan <shuah@...nel.org>, 
	"open list:BPF [GENERAL] (Safe Dynamic Programs and Tools)" <bpf@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH bpf-next v3 1/2] bpf: add bpf_strcasestr,bpf_strncasestr kfuncs

On Mon, Oct 6, 2025 at 8:00 PM Rong Tao <rtoax@...mail.com> wrote:
>
> +/**
> + * bpf_strnstr - Find the first substring in a length-limited string, ignoring
> + *               the case of the characters
> + * @s1__ign: The string to be searched
> + * @s2__ign: The string to search for
> + * @len: the maximum number of characters to search
> + *
> + * Return:
> + * * >=0      - Index of the first character of the first occurrence of @s2__ign
> + *              within the first @len characters of @s1__ign
> + * * %-ENOENT - @s2__ign not found in the first @len characters of @s1__ign
> + * * %-EFAULT - Cannot read one of the strings
> + * * %-E2BIG  - One of the strings is too large
> + * * %-ERANGE - One of the strings is outside of kernel address space
> + */
> +__bpf_kfunc int bpf_strncasestr(const char *s1__ign, const char *s2__ign,
> +                                                               size_t len)

See AI review for the above part.

pw-bot: cr