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

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Message-Id: <20250603022610.3005963-1-chen.dylane@linux.dev>
Date: Tue,  3 Jun 2025 10:26:08 +0800
From: Tao Chen <chen.dylane@...ux.dev>
To: 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,
	jolsa@...nel.org
Cc: bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Tao Chen <chen.dylane@...ux.dev>
Subject: [PATCH bpf-next v2 1/3] bpf: Add cookie to raw_tp bpf_link_info

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>
---
 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