[PATCH bpf-next 17/18] bpf: add bpf_wq_start

From: Benjamin Tissoires <bentiss@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
	 Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>,
	 Martin KaFai Lau <martin.lau@linux.dev>,
	 Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
	 Yonghong Song <yonghong.song@linux.dev>,
	 John Fastabend <john.fastabend@gmail.com>,
	KP Singh <kpsingh@kernel.org>,
	 Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
	 Jiri Olsa <jolsa@kernel.org>, Mykola Lysenko <mykolal@fb.com>,
	 Shuah Khan <shuah@kernel.org>
Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
	 linux-kselftest@vger.kernel.org,
	Benjamin Tissoires <bentiss@kernel.org>
Subject: [PATCH bpf-next 17/18] bpf: add bpf_wq_start
Date: Tue, 16 Apr 2024 16:08:30 +0200	[thread overview]
Message-ID: <20240416-bpf_wq-v1-17-c9e66092f842@kernel.org> (raw)
In-Reply-To: <20240416-bpf_wq-v1-0-c9e66092f842@kernel.org>

again, copy/paste from bpf_timer_start().

Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
 kernel/bpf/helpers.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index e5c8adc44619..ed5309a37eda 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -2728,6 +2728,29 @@ __bpf_kfunc int bpf_wq_init(struct bpf_wq *wq, void *map, unsigned int flags)
 	return __bpf_async_init(async, map, flags, BPF_ASYNC_TYPE_WQ);
 }
 
+__bpf_kfunc int bpf_wq_start(struct bpf_wq *wq, unsigned int flags)
+{
+	struct bpf_async_kern *async = (struct bpf_async_kern *)wq;
+	struct bpf_work *w;
+	int ret = 0;
+
+	if (in_nmi())
+		return -EOPNOTSUPP;
+	if (flags)
+		return -EINVAL;
+	__bpf_spin_lock_irqsave(&async->lock);
+	w = async->work;
+	if (!w || !w->cb.prog) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	schedule_work(&w->work);
+out:
+	__bpf_spin_unlock_irqrestore(&async->lock);
+	return ret;
+}
+
 __bpf_kfunc int bpf_wq_set_callback_impl(struct bpf_wq *wq,
 					 int (callback_fn)(void *map, int *key, struct bpf_wq *wq),
 					 unsigned int flags__k,
@@ -2821,6 +2844,7 @@ BTF_ID_FLAGS(func, bpf_dynptr_clone)
 BTF_ID_FLAGS(func, bpf_modify_return_test_tp)
 BTF_ID_FLAGS(func, bpf_wq_init)
 BTF_ID_FLAGS(func, bpf_wq_set_callback_impl)
+BTF_ID_FLAGS(func, bpf_wq_start)
 BTF_KFUNCS_END(common_btf_ids)
 
 static const struct btf_kfunc_id_set common_kfunc_set = {

-- 
2.44.0

