netdev - [PATCH v2 net-next 05/10] net: annotate accesses to sk->sk_rx_queue

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Message-Id: <20211025164825.259415-6-eric.dumazet@gmail.com>
Date:   Mon, 25 Oct 2021 09:48:20 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Neal Cardwell <ncardwell@...gle.com>
Subject: [PATCH v2 net-next 05/10] net: annotate accesses to sk->sk_rx_queue_mapping

From: Eric Dumazet <edumazet@...gle.com>

sk->sk_rx_queue_mapping can be modified locklessly,
add a couple of READ_ONCE()/WRITE_ONCE() to document this fact.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/sock.h | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index b4d3744b188ad869b4ec55f78e04236b710898de..b76be30674efc88434ed45d46b9c4600261b6271 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1925,15 +1925,19 @@ static inline void sk_rx_queue_set(struct sock *sk, const struct sk_buff *skb)
 static inline void sk_rx_queue_clear(struct sock *sk)
 {
 #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING
-	sk->sk_rx_queue_mapping = NO_QUEUE_MAPPING;
+	WRITE_ONCE(sk->sk_rx_queue_mapping, NO_QUEUE_MAPPING);
 #endif
 }
 
 static inline int sk_rx_queue_get(const struct sock *sk)
 {
 #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING
-	if (sk && sk->sk_rx_queue_mapping != NO_QUEUE_MAPPING)
-		return sk->sk_rx_queue_mapping;
+	if (sk) {
+		int res = READ_ONCE(sk->sk_rx_queue_mapping);
+
+		if (res != NO_QUEUE_MAPPING)
+			return res;
+	}
 #endif
 
 	return -1;
-- 
2.33.0.1079.g6e70778dc9-goog