[PATCH bpf v3 0/2] bpf: add _impl suffix for kfuncs with implicit args

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* [PATCH bpf v3 0/2] bpf: add _impl suffix for kfuncs with implicit args
@ 2025-11-04 22:54 Mykyta Yatsenko
  2025-11-04 22:54 ` [PATCH bpf v3 1/2] bpf:add _impl suffix for bpf_task_work_schedule* kfuncs Mykyta Yatsenko
                   ` (3 more replies)
  0 siblings, 4 replies; 5+ messages in thread
From: Mykyta Yatsenko @ 2025-11-04 22:54 UTC (permalink / raw)
  To: bpf, ast, andrii, daniel, kafai, kernel-team; +Cc: Mykyta Yatsenko

We have established a pattern of function naming win "_impl" suffix;
those functions accept verifier-provided bpf_prog_aux argument.
Following uniform convention will allow for transparent backwards
compatibility with the upcoming KF_IMPLICIT_ARGS feature. This patch
set aims to fix current deviation from the convention to eliminate
unnecessary backwards incompatibility in the future.

Three kfuncs added in 6.18 don’t follow this *_impl convention and
therefore won’t participate in the new KF_IMPLICIT_ARGS mechanism:
 * bpf_task_work_schedule_resume()
 * bpf_task_work_schedule_signal()
 * bpf_stream_vprintk()

Rename them to align with the implicit-arg flow:
bpf_task_work_schedule_resume() -> bpf_task_work_schedule_resume_impl()
bpf_task_work_schedule_signal() -> bpf_task_work_schedule_signal_impl()
bpf_stream_vprintk() -> bpf_stream_vprintk_impl()

The KF_IMPLICIT_ARGS mechanism is not in tree yet, so callers must
switch to the *_impl names for now. Once the new mechanism lands, the
plain names (without _impl) will be reintroduced.

Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
---
Changes in v3:
- Fix commit messages
- Link to v2: https://lore.kernel.org/r/20251104-implv2-v2-0-6dbc35f39f28@meta.com

Changes in v1:
- Split commit into 2
- Rebase on the correct branch
- Link to v1: https://lore.kernel.org/all/20251103232319.122965-1-mykyta.yatsenko5@gmail.com/

---
Mykyta Yatsenko (2):
      bpf:add _impl suffix for bpf_task_work_schedule* kfuncs
      bpf: add _impl suffix for bpf_stream_vprintk() kfunc

 kernel/bpf/helpers.c                               | 26 +++++++++++---------
 kernel/bpf/stream.c                                |  3 ++-
 kernel/bpf/verifier.c                              | 12 +++++-----
 tools/bpf/bpftool/Documentation/bpftool-prog.rst   |  2 +-
 tools/lib/bpf/bpf_helpers.h                        | 28 +++++++++++-----------
 tools/testing/selftests/bpf/progs/stream_fail.c    |  6 ++---
 tools/testing/selftests/bpf/progs/task_work.c      |  6 ++---
 tools/testing/selftests/bpf/progs/task_work_fail.c |  8 +++----
 .../testing/selftests/bpf/progs/task_work_stress.c |  4 ++--
 9 files changed, 50 insertions(+), 45 deletions(-)
---
base-commit: 6146a0f1dfae5d37442a9ddcba012add260bceb0
change-id: 20251104-implv2-d6c4be255026

Best regards,
-- 
Mykyta Yatsenko <yatsenko@meta.com>


^ permalink raw reply	[flat|nested] 5+ messages in thread

* [PATCH bpf v3 1/2] bpf:add _impl suffix for bpf_task_work_schedule* kfuncs
  2025-11-04 22:54 [PATCH bpf v3 0/2] bpf: add _impl suffix for kfuncs with implicit args Mykyta Yatsenko
@ 2025-11-04 22:54 ` Mykyta Yatsenko
  2025-11-04 22:54 ` [PATCH bpf v3 2/2] bpf: add _impl suffix for bpf_stream_vprintk() kfunc Mykyta Yatsenko
                   ` (2 subsequent siblings)
  3 siblings, 0 replies; 5+ messages in thread
From: Mykyta Yatsenko @ 2025-11-04 22:54 UTC (permalink / raw)
  To: bpf, ast, andrii, daniel, kafai, kernel-team; +Cc: Mykyta Yatsenko

From: Mykyta Yatsenko <yatsenko@meta.com>

Rename:
bpf_task_work_schedule_resume()->bpf_task_work_schedule_resume_impl()
bpf_task_work_schedule_signal()->bpf_task_work_schedule_signal_impl()

This aligns task work scheduling kfuncs with the established naming
scheme for kfuncs with the bpf_prog_aux argument provided by the
verifier implicitly. This convention will be taken advantage of with the
upcoming KF_IMPLICIT_ARGS feature to preserve backwards compatibility to
BPF programs.

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
---
 kernel/bpf/helpers.c                               | 24 +++++++++++++---------
 kernel/bpf/verifier.c                              | 12 +++++------
 tools/testing/selftests/bpf/progs/task_work.c      |  6 +++---
 tools/testing/selftests/bpf/progs/task_work_fail.c |  8 ++++----
 .../testing/selftests/bpf/progs/task_work_stress.c |  4 ++--
 5 files changed, 29 insertions(+), 25 deletions(-)

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index eb25e70e0bdc0332edd21cde66d9aaadb2090312..33173b027ccf8893ce18aad474b88f8544f7b344 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -4169,7 +4169,8 @@ static int bpf_task_work_schedule(struct task_struct *task, struct bpf_task_work
 }
 
 /**
- * bpf_task_work_schedule_signal - Schedule BPF callback using task_work_add with TWA_SIGNAL mode
+ * bpf_task_work_schedule_signal_impl - Schedule BPF callback using task_work_add with TWA_SIGNAL
+ * mode
  * @task: Task struct for which callback should be scheduled
  * @tw: Pointer to struct bpf_task_work in BPF map value for internal bookkeeping
  * @map__map: bpf_map that embeds struct bpf_task_work in the values
@@ -4178,15 +4179,17 @@ static int bpf_task_work_schedule(struct task_struct *task, struct bpf_task_work
  *
  * Return: 0 if task work has been scheduled successfully, negative error code otherwise
  */
-__bpf_kfunc int bpf_task_work_schedule_signal(struct task_struct *task, struct bpf_task_work *tw,
-					      void *map__map, bpf_task_work_callback_t callback,
-					      void *aux__prog)
+__bpf_kfunc int bpf_task_work_schedule_signal_impl(struct task_struct *task,
+						   struct bpf_task_work *tw, void *map__map,
+						   bpf_task_work_callback_t callback,
+						   void *aux__prog)
 {
 	return bpf_task_work_schedule(task, tw, map__map, callback, aux__prog, TWA_SIGNAL);
 }
 
 /**
- * bpf_task_work_schedule_resume - Schedule BPF callback using task_work_add with TWA_RESUME mode
+ * bpf_task_work_schedule_resume_impl - Schedule BPF callback using task_work_add with TWA_RESUME
+ * mode
  * @task: Task struct for which callback should be scheduled
  * @tw: Pointer to struct bpf_task_work in BPF map value for internal bookkeeping
  * @map__map: bpf_map that embeds struct bpf_task_work in the values
@@ -4195,9 +4198,10 @@ __bpf_kfunc int bpf_task_work_schedule_signal(struct task_struct *task, struct b
  *
  * Return: 0 if task work has been scheduled successfully, negative error code otherwise
  */
-__bpf_kfunc int bpf_task_work_schedule_resume(struct task_struct *task, struct bpf_task_work *tw,
-					      void *map__map, bpf_task_work_callback_t callback,
-					      void *aux__prog)
+__bpf_kfunc int bpf_task_work_schedule_resume_impl(struct task_struct *task,
+						   struct bpf_task_work *tw, void *map__map,
+						   bpf_task_work_callback_t callback,
+						   void *aux__prog)
 {
 	return bpf_task_work_schedule(task, tw, map__map, callback, aux__prog, TWA_RESUME);
 }
@@ -4377,8 +4381,8 @@ BTF_ID_FLAGS(func, bpf_strnstr);
 BTF_ID_FLAGS(func, bpf_cgroup_read_xattr, KF_RCU)
 #endif
 BTF_ID_FLAGS(func, bpf_stream_vprintk, KF_TRUSTED_ARGS)
-BTF_ID_FLAGS(func, bpf_task_work_schedule_signal, KF_TRUSTED_ARGS)
-BTF_ID_FLAGS(func, bpf_task_work_schedule_resume, KF_TRUSTED_ARGS)
+BTF_ID_FLAGS(func, bpf_task_work_schedule_signal_impl, KF_TRUSTED_ARGS)
+BTF_ID_FLAGS(func, bpf_task_work_schedule_resume_impl, KF_TRUSTED_ARGS)
 BTF_KFUNCS_END(common_btf_ids)
 
 static const struct btf_kfunc_id_set common_kfunc_set = {
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index ff40e5e65c435862e9ecd3ed37139cc177a13ea1..8314518c8d93ae16235e6f2fe6c5c28c45cb81d2 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -12259,8 +12259,8 @@ enum special_kfunc_type {
 	KF_bpf_res_spin_lock_irqsave,
 	KF_bpf_res_spin_unlock_irqrestore,
 	KF___bpf_trap,
-	KF_bpf_task_work_schedule_signal,
-	KF_bpf_task_work_schedule_resume,
+	KF_bpf_task_work_schedule_signal_impl,
+	KF_bpf_task_work_schedule_resume_impl,
 };
 
 BTF_ID_LIST(special_kfunc_list)
@@ -12331,13 +12331,13 @@ BTF_ID(func, bpf_res_spin_unlock)
 BTF_ID(func, bpf_res_spin_lock_irqsave)
 BTF_ID(func, bpf_res_spin_unlock_irqrestore)
 BTF_ID(func, __bpf_trap)
-BTF_ID(func, bpf_task_work_schedule_signal)
-BTF_ID(func, bpf_task_work_schedule_resume)
+BTF_ID(func, bpf_task_work_schedule_signal_impl)
+BTF_ID(func, bpf_task_work_schedule_resume_impl)
 
 static bool is_task_work_add_kfunc(u32 func_id)
 {
-	return func_id == special_kfunc_list[KF_bpf_task_work_schedule_signal] ||
-	       func_id == special_kfunc_list[KF_bpf_task_work_schedule_resume];
+	return func_id == special_kfunc_list[KF_bpf_task_work_schedule_signal_impl] ||
+	       func_id == special_kfunc_list[KF_bpf_task_work_schedule_resume_impl];
 }
 
 static bool is_kfunc_ret_null(struct bpf_kfunc_call_arg_meta *meta)
diff --git a/tools/testing/selftests/bpf/progs/task_work.c b/tools/testing/selftests/bpf/progs/task_work.c
index 23217f06a3ece641089c1ea6a470eccc82e0d1fa..663a80990f8f8759f470d2f874d02485b072a5e1 100644
--- a/tools/testing/selftests/bpf/progs/task_work.c
+++ b/tools/testing/selftests/bpf/progs/task_work.c
@@ -66,7 +66,7 @@ int oncpu_hash_map(struct pt_regs *args)
 	if (!work)
 		return 0;
 
-	bpf_task_work_schedule_resume(task, &work->tw, &hmap, process_work, NULL);
+	bpf_task_work_schedule_resume_impl(task, &work->tw, &hmap, process_work, NULL);
 	return 0;
 }
 
@@ -80,7 +80,7 @@ int oncpu_array_map(struct pt_regs *args)
 	work = bpf_map_lookup_elem(&arrmap, &key);
 	if (!work)
 		return 0;
-	bpf_task_work_schedule_signal(task, &work->tw, &arrmap, process_work, NULL);
+	bpf_task_work_schedule_signal_impl(task, &work->tw, &arrmap, process_work, NULL);
 	return 0;
 }
 
@@ -102,6 +102,6 @@ int oncpu_lru_map(struct pt_regs *args)
 	work = bpf_map_lookup_elem(&lrumap, &key);
 	if (!work || work->data[0])
 		return 0;
-	bpf_task_work_schedule_resume(task, &work->tw, &lrumap, process_work, NULL);
+	bpf_task_work_schedule_resume_impl(task, &work->tw, &lrumap, process_work, NULL);
 	return 0;
 }
diff --git a/tools/testing/selftests/bpf/progs/task_work_fail.c b/tools/testing/selftests/bpf/progs/task_work_fail.c
index 77fe8f28facdb60cd69e77b72ea24db8f97004f7..1270953fd0926f83f9ad7112d78e1b86bd1e802c 100644
--- a/tools/testing/selftests/bpf/progs/task_work_fail.c
+++ b/tools/testing/selftests/bpf/progs/task_work_fail.c
@@ -53,7 +53,7 @@ int mismatch_map(struct pt_regs *args)
 	work = bpf_map_lookup_elem(&arrmap, &key);
 	if (!work)
 		return 0;
-	bpf_task_work_schedule_resume(task, &work->tw, &hmap, process_work, NULL);
+	bpf_task_work_schedule_resume_impl(task, &work->tw, &hmap, process_work, NULL);
 	return 0;
 }
 
@@ -65,7 +65,7 @@ int no_map_task_work(struct pt_regs *args)
 	struct bpf_task_work tw;
 
 	task = bpf_get_current_task_btf();
-	bpf_task_work_schedule_resume(task, &tw, &hmap, process_work, NULL);
+	bpf_task_work_schedule_resume_impl(task, &tw, &hmap, process_work, NULL);
 	return 0;
 }
 
@@ -76,7 +76,7 @@ int task_work_null(struct pt_regs *args)
 	struct task_struct *task;
 
 	task = bpf_get_current_task_btf();
-	bpf_task_work_schedule_resume(task, NULL, &hmap, process_work, NULL);
+	bpf_task_work_schedule_resume_impl(task, NULL, &hmap, process_work, NULL);
 	return 0;
 }
 
@@ -91,6 +91,6 @@ int map_null(struct pt_regs *args)
 	work = bpf_map_lookup_elem(&arrmap, &key);
 	if (!work)
 		return 0;
-	bpf_task_work_schedule_resume(task, &work->tw, NULL, process_work, NULL);
+	bpf_task_work_schedule_resume_impl(task, &work->tw, NULL, process_work, NULL);
 	return 0;
 }
diff --git a/tools/testing/selftests/bpf/progs/task_work_stress.c b/tools/testing/selftests/bpf/progs/task_work_stress.c
index 90fca06fff56ca9a03fee028ca1b69db145a227b..55e555f7f41be694f9b3d98f324b402f9355f77d 100644
--- a/tools/testing/selftests/bpf/progs/task_work_stress.c
+++ b/tools/testing/selftests/bpf/progs/task_work_stress.c
@@ -51,8 +51,8 @@ int schedule_task_work(void *ctx)
 		if (!work)
 			return 0;
 	}
-	err = bpf_task_work_schedule_signal(bpf_get_current_task_btf(), &work->tw, &hmap,
-					    process_work, NULL);
+	err = bpf_task_work_schedule_signal_impl(bpf_get_current_task_btf(), &work->tw, &hmap,
+						 process_work, NULL);
 	if (err)
 		__sync_fetch_and_add(&schedule_error, 1);
 	else

-- 
2.51.1


^ permalink raw reply related	[flat|nested] 5+ messages in thread

* [PATCH bpf v3 2/2] bpf: add _impl suffix for bpf_stream_vprintk() kfunc
  2025-11-04 22:54 [PATCH bpf v3 0/2] bpf: add _impl suffix for kfuncs with implicit args Mykyta Yatsenko
  2025-11-04 22:54 ` [PATCH bpf v3 1/2] bpf:add _impl suffix for bpf_task_work_schedule* kfuncs Mykyta Yatsenko
@ 2025-11-04 22:54 ` Mykyta Yatsenko
  2025-11-04 23:08 ` [PATCH bpf v3 0/2] bpf: add _impl suffix for kfuncs with implicit args Ihor Solodrai
  2025-11-05  2:00 ` patchwork-bot+netdevbpf
  3 siblings, 0 replies; 5+ messages in thread
From: Mykyta Yatsenko @ 2025-11-04 22:54 UTC (permalink / raw)
  To: bpf, ast, andrii, daniel, kafai, kernel-team; +Cc: Mykyta Yatsenko

From: Mykyta Yatsenko <yatsenko@meta.com>

Rename bpf_stream_vprintk() to bpf_stream_vprintk_impl().

This makes bpf_stream_vprintk() follow the already established "_impl"
suffix-based naming convention for kfuncs with the bpf_prog_aux
argument provided by the verifier implicitly. This convention will be
taken advantage of with the upcoming KF_IMPLICIT_ARGS feature to
preserve backwards compatibility to BPF programs.

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
---
 kernel/bpf/helpers.c                             |  2 +-
 kernel/bpf/stream.c                              |  3 ++-
 tools/bpf/bpftool/Documentation/bpftool-prog.rst |  2 +-
 tools/lib/bpf/bpf_helpers.h                      | 28 ++++++++++++------------
 tools/testing/selftests/bpf/progs/stream_fail.c  |  6 ++---
 5 files changed, 21 insertions(+), 20 deletions(-)

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 33173b027ccf8893ce18aad474b88f8544f7b344..e4007fea49091c01c1d23af55a25f5567417e978 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -4380,7 +4380,7 @@ BTF_ID_FLAGS(func, bpf_strnstr);
 #if defined(CONFIG_BPF_LSM) && defined(CONFIG_CGROUPS)
 BTF_ID_FLAGS(func, bpf_cgroup_read_xattr, KF_RCU)
 #endif
-BTF_ID_FLAGS(func, bpf_stream_vprintk, KF_TRUSTED_ARGS)
+BTF_ID_FLAGS(func, bpf_stream_vprintk_impl, KF_TRUSTED_ARGS)
 BTF_ID_FLAGS(func, bpf_task_work_schedule_signal_impl, KF_TRUSTED_ARGS)
 BTF_ID_FLAGS(func, bpf_task_work_schedule_resume_impl, KF_TRUSTED_ARGS)
 BTF_KFUNCS_END(common_btf_ids)
diff --git a/kernel/bpf/stream.c b/kernel/bpf/stream.c
index eb6c5a21c2efee96c41f4c5e43d54062694a4859..ff16c631951bb685e8ecf1707206dad603121a65 100644
--- a/kernel/bpf/stream.c
+++ b/kernel/bpf/stream.c
@@ -355,7 +355,8 @@ __bpf_kfunc_start_defs();
  * Avoid using enum bpf_stream_id so that kfunc users don't have to pull in the
  * enum in headers.
  */
-__bpf_kfunc int bpf_stream_vprintk(int stream_id, const char *fmt__str, const void *args, u32 len__sz, void *aux__prog)
+__bpf_kfunc int bpf_stream_vprintk_impl(int stream_id, const char *fmt__str, const void *args,
+					u32 len__sz, void *aux__prog)
 {
 	struct bpf_bprintf_data data = {
 		.get_bin_args	= true,
diff --git a/tools/bpf/bpftool/Documentation/bpftool-prog.rst b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
index 009633294b0934ac282601cf21a0fd03c388de2c..35aeeaf5f71166f0e1e8759da8639c2533d47482 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-prog.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
@@ -182,7 +182,7 @@ bpftool prog tracelog
 
 bpftool prog tracelog { stdout | stderr } *PROG*
     Dump the BPF stream of the program. BPF programs can write to these streams
-    at runtime with the **bpf_stream_vprintk**\ () kfunc. The kernel may write
+    at runtime with the **bpf_stream_vprintk_impl**\ () kfunc. The kernel may write
     error messages to the standard error stream. This facility should be used
     only for debugging purposes.
 
diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h
index 80c028540656176376909cb796e56de433ef3aab..d4e4e388e625894f8ec27b5a6278dbb46e658720 100644
--- a/tools/lib/bpf/bpf_helpers.h
+++ b/tools/lib/bpf/bpf_helpers.h
@@ -315,20 +315,20 @@ enum libbpf_tristate {
 			  ___param, sizeof(___param));		\
 })
 
-extern int bpf_stream_vprintk(int stream_id, const char *fmt__str, const void *args,
-			      __u32 len__sz, void *aux__prog) __weak __ksym;
-
-#define bpf_stream_printk(stream_id, fmt, args...)				\
-({										\
-	static const char ___fmt[] = fmt;					\
-	unsigned long long ___param[___bpf_narg(args)];				\
-										\
-	_Pragma("GCC diagnostic push")						\
-	_Pragma("GCC diagnostic ignored \"-Wint-conversion\"")			\
-	___bpf_fill(___param, args);						\
-	_Pragma("GCC diagnostic pop")						\
-										\
-	bpf_stream_vprintk(stream_id, ___fmt, ___param, sizeof(___param), NULL);\
+extern int bpf_stream_vprintk_impl(int stream_id, const char *fmt__str, const void *args,
+				   __u32 len__sz, void *aux__prog) __weak __ksym;
+
+#define bpf_stream_printk(stream_id, fmt, args...)					\
+({											\
+	static const char ___fmt[] = fmt;						\
+	unsigned long long ___param[___bpf_narg(args)];					\
+											\
+	_Pragma("GCC diagnostic push")							\
+	_Pragma("GCC diagnostic ignored \"-Wint-conversion\"")				\
+	___bpf_fill(___param, args);							\
+	_Pragma("GCC diagnostic pop")							\
+											\
+	bpf_stream_vprintk_impl(stream_id, ___fmt, ___param, sizeof(___param), NULL);	\
 })
 
 /* Use __bpf_printk when bpf_printk call has 3 or fewer fmt args
diff --git a/tools/testing/selftests/bpf/progs/stream_fail.c b/tools/testing/selftests/bpf/progs/stream_fail.c
index b4a0d0cc8ec8a9483b5967745cd35f8bd940460e..3662515f0107740c147f5a9296b4da06fa508364 100644
--- a/tools/testing/selftests/bpf/progs/stream_fail.c
+++ b/tools/testing/selftests/bpf/progs/stream_fail.c
@@ -10,7 +10,7 @@ SEC("syscall")
 __failure __msg("Possibly NULL pointer passed")
 int stream_vprintk_null_arg(void *ctx)
 {
-	bpf_stream_vprintk(BPF_STDOUT, "", NULL, 0, NULL);
+	bpf_stream_vprintk_impl(BPF_STDOUT, "", NULL, 0, NULL);
 	return 0;
 }
 
@@ -18,7 +18,7 @@ SEC("syscall")
 __failure __msg("R3 type=scalar expected=")
 int stream_vprintk_scalar_arg(void *ctx)
 {
-	bpf_stream_vprintk(BPF_STDOUT, "", (void *)46, 0, NULL);
+	bpf_stream_vprintk_impl(BPF_STDOUT, "", (void *)46, 0, NULL);
 	return 0;
 }
 
@@ -26,7 +26,7 @@ SEC("syscall")
 __failure __msg("arg#1 doesn't point to a const string")
 int stream_vprintk_string_arg(void *ctx)
 {
-	bpf_stream_vprintk(BPF_STDOUT, ctx, NULL, 0, NULL);
+	bpf_stream_vprintk_impl(BPF_STDOUT, ctx, NULL, 0, NULL);
 	return 0;
 }
 

-- 
2.51.1


^ permalink raw reply related	[flat|nested] 5+ messages in thread

* Re: [PATCH bpf v3 0/2] bpf: add _impl suffix for kfuncs with implicit args
  2025-11-04 22:54 [PATCH bpf v3 0/2] bpf: add _impl suffix for kfuncs with implicit args Mykyta Yatsenko
  2025-11-04 22:54 ` [PATCH bpf v3 1/2] bpf:add _impl suffix for bpf_task_work_schedule* kfuncs Mykyta Yatsenko
  2025-11-04 22:54 ` [PATCH bpf v3 2/2] bpf: add _impl suffix for bpf_stream_vprintk() kfunc Mykyta Yatsenko
@ 2025-11-04 23:08 ` Ihor Solodrai
  2025-11-05  2:00 ` patchwork-bot+netdevbpf
  3 siblings, 0 replies; 5+ messages in thread
From: Ihor Solodrai @ 2025-11-04 23:08 UTC (permalink / raw)
  To: Mykyta Yatsenko, bpf, ast, andrii, daniel, kafai, kernel-team
  Cc: Mykyta Yatsenko

On 11/4/25 2:54 PM, Mykyta Yatsenko wrote:
> We have established a pattern of function naming win "_impl" suffix;
> those functions accept verifier-provided bpf_prog_aux argument.
> Following uniform convention will allow for transparent backwards
> compatibility with the upcoming KF_IMPLICIT_ARGS feature. This patch
> set aims to fix current deviation from the convention to eliminate
> unnecessary backwards incompatibility in the future.
> 
> Three kfuncs added in 6.18 don’t follow this *_impl convention and
> therefore won’t participate in the new KF_IMPLICIT_ARGS mechanism:
>  * bpf_task_work_schedule_resume()
>  * bpf_task_work_schedule_signal()
>  * bpf_stream_vprintk()
> 
> Rename them to align with the implicit-arg flow:
> bpf_task_work_schedule_resume() -> bpf_task_work_schedule_resume_impl()
> bpf_task_work_schedule_signal() -> bpf_task_work_schedule_signal_impl()
> bpf_stream_vprintk() -> bpf_stream_vprintk_impl()
> 
> The KF_IMPLICIT_ARGS mechanism is not in tree yet, so callers must
> switch to the *_impl names for now. Once the new mechanism lands, the
> plain names (without _impl) will be reintroduced.
> 
> Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>

Acked-by: Ihor Solodrai <ihor.solodrai@linux.dev>

Thanks!

> ---
> Changes in v3:
> - Fix commit messages
> - Link to v2: https://lore.kernel.org/r/20251104-implv2-v2-0-6dbc35f39f28@meta.com
> 
> Changes in v1:
> - Split commit into 2
> - Rebase on the correct branch
> - Link to v1: https://lore.kernel.org/all/20251103232319.122965-1-mykyta.yatsenko5@gmail.com/
> 
> ---
> Mykyta Yatsenko (2):
>       bpf:add _impl suffix for bpf_task_work_schedule* kfuncs
>       bpf: add _impl suffix for bpf_stream_vprintk() kfunc
> 
>  kernel/bpf/helpers.c                               | 26 +++++++++++---------
>  kernel/bpf/stream.c                                |  3 ++-
>  kernel/bpf/verifier.c                              | 12 +++++-----
>  tools/bpf/bpftool/Documentation/bpftool-prog.rst   |  2 +-
>  tools/lib/bpf/bpf_helpers.h                        | 28 +++++++++++-----------
>  tools/testing/selftests/bpf/progs/stream_fail.c    |  6 ++---
>  tools/testing/selftests/bpf/progs/task_work.c      |  6 ++---
>  tools/testing/selftests/bpf/progs/task_work_fail.c |  8 +++----
>  .../testing/selftests/bpf/progs/task_work_stress.c |  4 ++--
>  9 files changed, 50 insertions(+), 45 deletions(-)
> ---
> base-commit: 6146a0f1dfae5d37442a9ddcba012add260bceb0
> change-id: 20251104-implv2-d6c4be255026
> 
> Best regards,


^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH bpf v3 0/2] bpf: add _impl suffix for kfuncs with implicit args
  2025-11-04 22:54 [PATCH bpf v3 0/2] bpf: add _impl suffix for kfuncs with implicit args Mykyta Yatsenko
                   ` (2 preceding siblings ...)
  2025-11-04 23:08 ` [PATCH bpf v3 0/2] bpf: add _impl suffix for kfuncs with implicit args Ihor Solodrai
@ 2025-11-05  2:00 ` patchwork-bot+netdevbpf
  3 siblings, 0 replies; 5+ messages in thread
From: patchwork-bot+netdevbpf @ 2025-11-05  2:00 UTC (permalink / raw)
  To: Mykyta Yatsenko; +Cc: bpf, ast, andrii, daniel, kafai, kernel-team, yatsenko

Hello:

This series was applied to bpf/bpf.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Tue, 04 Nov 2025 22:54:24 +0000 you wrote:
> We have established a pattern of function naming win "_impl" suffix;
> those functions accept verifier-provided bpf_prog_aux argument.
> Following uniform convention will allow for transparent backwards
> compatibility with the upcoming KF_IMPLICIT_ARGS feature. This patch
> set aims to fix current deviation from the convention to eliminate
> unnecessary backwards incompatibility in the future.
> 
> [...]

Here is the summary with links:
  - [bpf,v3,1/2] bpf:add _impl suffix for bpf_task_work_schedule* kfuncs
    https://git.kernel.org/bpf/bpf/c/ea0714d61dea
  - [bpf,v3,2/2] bpf: add _impl suffix for bpf_stream_vprintk() kfunc
    https://git.kernel.org/bpf/bpf/c/137cc92ffe2e

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html



^ permalink raw reply	[flat|nested] 5+ messages in thread

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-- links below jump to the message on this page --
2025-11-04 22:54 [PATCH bpf v3 0/2] bpf: add _impl suffix for kfuncs with implicit args Mykyta Yatsenko
2025-11-04 22:54 ` [PATCH bpf v3 1/2] bpf:add _impl suffix for bpf_task_work_schedule* kfuncs Mykyta Yatsenko
2025-11-04 22:54 ` [PATCH bpf v3 2/2] bpf: add _impl suffix for bpf_stream_vprintk() kfunc Mykyta Yatsenko
2025-11-04 23:08 ` [PATCH bpf v3 0/2] bpf: add _impl suffix for kfuncs with implicit args Ihor Solodrai
2025-11-05  2:00 ` patchwork-bot+netdevbpf

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