linux-kernel - Re: [PATCH bpf-next v2 1/3] bpf: Add cookie to raw_tp bpf_link

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Message-ID: <aD7oR_JGXuG4ru9W@krava>
Date: Tue, 3 Jun 2025 14:19:19 +0200
From: Jiri Olsa <olsajiri@...il.com>
To: Tao Chen <chen.dylane@...ux.dev>
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
	martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org,
	yonghong.song@...ux.dev, john.fastabend@...il.com,
	kpsingh@...nel.org, sdf@...ichev.me, qmo@...nel.org,
	bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v2 1/3] bpf: Add cookie to raw_tp bpf_link_info

On Tue, Jun 03, 2025 at 10:26:08AM +0800, Tao Chen wrote:
> After commit 68ca5d4eebb8 ("bpf: support BPF cookie in raw tracepoint
> (raw_tp, tp_btf) programs"), we can show the cookie in bpf_link_info
> like kprobe etc.
> 
> Signed-off-by: Tao Chen <chen.dylane@...ux.dev>

Acked-by: Jiri Olsa <jolsa@...nel.org>

jirka

> ---
>  include/uapi/linux/bpf.h       | 2 ++
>  kernel/bpf/syscall.c           | 1 +
>  tools/include/uapi/linux/bpf.h | 2 ++
>  3 files changed, 5 insertions(+)
> 
> Change list:
> - v1 -> v2:
>     - fill the hole in bpf_link_info.(Jiri)
> - v1:
>     https://lore.kernel.org/bpf/20250529165759.2536245-1-chen.dylane@linux.dev
> 
> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> index 07ee73cdf9..f3e2aae302 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -6644,6 +6644,8 @@ struct bpf_link_info {
>  		struct {
>  			__aligned_u64 tp_name; /* in/out: tp_name buffer ptr */
>  			__u32 tp_name_len;     /* in/out: tp_name buffer len */
> +			__u32 reserved; /* just fill the hole */
> +			__u64 cookie;
>  		} raw_tracepoint;
>  		struct {
>  			__u32 attach_type;
> diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
> index 9794446bc8..1c3dbe44ac 100644
> --- a/kernel/bpf/syscall.c
> +++ b/kernel/bpf/syscall.c
> @@ -3687,6 +3687,7 @@ static int bpf_raw_tp_link_fill_link_info(const struct bpf_link *link,
>  		return -EINVAL;
>  
>  	info->raw_tracepoint.tp_name_len = tp_len + 1;
> +	info->raw_tracepoint.cookie = raw_tp_link->cookie;
>  
>  	if (!ubuf)
>  		return 0;
> diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
> index 07ee73cdf9..f3e2aae302 100644
> --- a/tools/include/uapi/linux/bpf.h
> +++ b/tools/include/uapi/linux/bpf.h
> @@ -6644,6 +6644,8 @@ struct bpf_link_info {
>  		struct {
>  			__aligned_u64 tp_name; /* in/out: tp_name buffer ptr */
>  			__u32 tp_name_len;     /* in/out: tp_name buffer len */
> +			__u32 reserved; /* just fill the hole */
> +			__u64 cookie;
>  		} raw_tracepoint;
>  		struct {
>  			__u32 attach_type;
> -- 
> 2.43.0
>