linux-kernel - Re: [PATCH RFC bpf-next v6 2/6] bpf: Add support for KF_ARG_PTR_TO

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Date: Tue, 09 Apr 2024 00:55:52 +0300
From: Eduard Zingerman <eddyz87@...il.com>
To: bentiss@...nel.org, Alexei Starovoitov <ast@...nel.org>, 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@...gle.com>, Hao Luo
 <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, Mykola Lysenko
 <mykolal@...com>,  Shuah Khan <shuah@...nel.org>
Cc: bpf@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, Kumar Kartikeya Dwivedi <memxor@...il.com>
Subject: Re: [PATCH RFC bpf-next v6 2/6] bpf: Add support for
 KF_ARG_PTR_TO_TIMER

On Mon, 2024-04-08 at 10:09 +0200, bentiss@...nel.org wrote:
> From: Kumar Kartikeya Dwivedi <memxor@...il.com>
> 
> Introduce support for KF_ARG_PTR_TO_TIMER. The kfuncs will use bpf_timer
> as argument and that will be recognized as timer argument by verifier.
> bpf_timer_kern casting can happen inside kfunc, but using bpf_timer in
> argument makes life easier for users who work with non-kern type in BPF
> progs.
> 
> Fix up process_timer_func's meta argument usage (ignore if NULL) so that
> we can share the same checks for helpers and kfuncs. meta argument is
> only needed to ensure bpf_timer_init's timer and map arguments are
> coming from the same map (map_uid logic is necessary for correct
> inner-map handling).
> 
> No such concerns will be necessary for kfuncs as timer initialization
> happens using helpers, hence pass NULL to process_timer_func from kfunc
> argument handling code to ignore it.
> 
> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
> Signed-off-by: Benjamin Tissoires <bentiss@...nel.org>
> 
> ---

Acked-by: Eduard Zingerman <eddyz87@...il.com>