diff mbox series

[v2,net-next,05/10] net: annotate accesses to sk->sk_rx_queue_mapping

Message ID 20211025164825.259415-6-eric.dumazet@gmail.com (mailing list archive)
State Accepted
Commit 09b898466792b0c387040e6df90a16e7a9f2a5d9
Delegated to: Netdev Maintainers
Headers show
Series tcp: receive path optimizations | expand

Checks

Context Check Description
netdev/cover_letter success Series has a cover letter
netdev/fixes_present success Fixes tag not required for -next series
netdev/patch_count success Link
netdev/tree_selection success Clearly marked for net-next
netdev/subject_prefix success Link
netdev/cc_maintainers success CCed 3 of 3 maintainers
netdev/source_inline success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/module_param success Was 0 now: 0
netdev/build_32bit success Errors and warnings before: 3051 this patch: 3051
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/verify_fixes success No Fixes tag
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 22 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 3135 this patch: 3135
netdev/header_inline success No static functions without inline keyword in header files

Commit Message

Eric Dumazet Oct. 25, 2021, 4:48 p.m. UTC 
From: Eric Dumazet <edumazet@google.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@google.com>
---
 include/net/sock.h | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)
diff mbox series

Patch

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;