linux-kernel - [PATCHv2] bpf: add bpf_msleep

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Message-ID: <20250515064800.2201498-1-senozhatsky@chromium.org>
Date: Thu, 15 May 2025 15:47:40 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	John Fastabend <john.fastabend@...il.com>
Cc: Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Matt Bobrowski <mattbobrowski@...gle.com>,
	Andrii Nakryiko <andrii.nakryiko@...il.com>,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [PATCHv2] bpf: add bpf_msleep_interruptible() kfunc

bpf_msleep_interruptible() puts a calling context into an
interruptible sleep.  This function is expected to be used
for testing only (perhaps in conjunction with fault-injection)
to simulate various execution delays or timeouts.

Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
---

v2:
-- switched to kfunc (Matt)

 kernel/bpf/helpers.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index fed53da75025..a7404ab3b0b8 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -24,6 +24,7 @@
 #include <linux/bpf_mem_alloc.h>
 #include <linux/kasan.h>
 #include <linux/bpf_verifier.h>
+#include <linux/delay.h>
 
 #include "../../lib/kstrtox.h"
 
@@ -3283,6 +3284,11 @@ __bpf_kfunc void bpf_local_irq_restore(unsigned long *flags__irq_flag)
 	local_irq_restore(*flags__irq_flag);
 }
 
+__bpf_kfunc unsigned long bpf_msleep_interruptible(unsigned int msecs)
+{
+	return msleep_interruptible(msecs);
+}
+
 __bpf_kfunc_end_defs();
 
 BTF_KFUNCS_START(generic_btf_ids)
@@ -3388,6 +3394,7 @@ BTF_ID_FLAGS(func, bpf_iter_kmem_cache_next, KF_ITER_NEXT | KF_RET_NULL | KF_SLE
 BTF_ID_FLAGS(func, bpf_iter_kmem_cache_destroy, KF_ITER_DESTROY | KF_SLEEPABLE)
 BTF_ID_FLAGS(func, bpf_local_irq_save)
 BTF_ID_FLAGS(func, bpf_local_irq_restore)
+BTF_ID_FLAGS(func, bpf_msleep_interruptible, KF_SLEEPABLE)
 BTF_KFUNCS_END(common_btf_ids)
 
 static const struct btf_kfunc_id_set common_kfunc_set = {
-- 
2.49.0.1101.gccaa498523-goog