netdev - [PATCH bpf-next 07/19] bpf: Disable migration when destroying sock storage

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Message-Id: <20250106081900.1665573-8-houtao@huaweicloud.com>
Date: Mon,  6 Jan 2025 16:18:48 +0800
From: Hou Tao <houtao@...weicloud.com>
To: bpf@...r.kernel.org,
	netdev@...r.kernel.org
Cc: Martin KaFai Lau <martin.lau@...ux.dev>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Andrii Nakryiko <andrii@...nel.org>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Hao Luo <haoluo@...gle.com>,
	Yonghong Song <yonghong.song@...ux.dev>,
	Daniel Borkmann <daniel@...earbox.net>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Jiri Olsa <jolsa@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	houtao1@...wei.com,
	xukuohai@...wei.com
Subject: [PATCH bpf-next 07/19] bpf: Disable migration when destroying sock storage

From: Hou Tao <houtao1@...wei.com>

When destroying sock storage, it invokes bpf_local_storage_destroy() to
remove all storage elements saved in the sock storage. The destroy
procedure will call bpf_selem_free() to free the element, and
bpf_selem_free() calls bpf_obj_free_fields() to free the special fields
in map value (e.g., kptr). Since kptrs may be allocated from bpf memory
allocator, migrate_{disable|enable} pairs are necessary for the freeing
of these kptrs.

To simplify reasoning about when migrate_disable() is needed for the
freeing of these dynamically-allocated kptrs, let the caller to
guarantee migration is disabled before invoking bpf_obj_free_fields().
Therefore, the patch adds migrate_{disable|enable} pair in
bpf_sock_storage_free(). The migrate_{disable|enable} pairs in the
underlying implementation of bpf_obj_free_fields() will be removed by
The following patch.

Signed-off-by: Hou Tao <houtao1@...wei.com>
---
 net/core/bpf_sk_storage.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/net/core/bpf_sk_storage.c b/net/core/bpf_sk_storage.c
index 2f4ed83a75ae..aa536ecd5d39 100644
--- a/net/core/bpf_sk_storage.c
+++ b/net/core/bpf_sk_storage.c
@@ -50,15 +50,16 @@ void bpf_sk_storage_free(struct sock *sk)
 {
 	struct bpf_local_storage *sk_storage;

+	migrate_disable();
 	rcu_read_lock();
 	sk_storage = rcu_dereference(sk->sk_bpf_storage);
-	if (!sk_storage) {
-		rcu_read_unlock();
-		return;
-	}
+	if (!sk_storage)
+		goto out;

 	bpf_local_storage_destroy(sk_storage);
+out:
 	rcu_read_unlock();
+	migrate_enable();
 }

 static void bpf_sk_storage_map_free(struct bpf_map *map)
-- 
2.29.2