netdev - [PATCH bpf-next v7 12/13] net-timestamp: introduce cgroup lock to avoid affecting non-bpf cases

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Message-Id: <20250128084620.57547-13-kerneljasonxing@gmail.com>
Date: Tue, 28 Jan 2025 16:46:19 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	dsahern@...nel.org,
	willemdebruijn.kernel@...il.com,
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Cc: bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	Jason Xing <kerneljasonxing@...il.com>
Subject: [PATCH bpf-next v7 12/13] net-timestamp: introduce cgroup lock to avoid affecting non-bpf cases

Introducing the lock to avoid affecting the applications which
are not using timestamping bpf feature.

Signed-off-by: Jason Xing <kerneljasonxing@...il.com>
---
 net/ipv4/tcp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index b2f1fd216df1..a2ac57543b6d 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -493,7 +493,8 @@ static void tcp_tx_timestamp(struct sock *sk, struct sockcm_cookie *sockc)
 			shinfo->tskey = TCP_SKB_CB(skb)->seq + skb->len - 1;
 	}
 
-	if (SK_BPF_CB_FLAG_TEST(sk, SK_BPF_CB_TX_TIMESTAMPING) && skb) {
+	if (cgroup_bpf_enabled(CGROUP_SOCK_OPS) &&
+	    SK_BPF_CB_FLAG_TEST(sk, SK_BPF_CB_TX_TIMESTAMPING) && skb) {
 		struct skb_shared_info *shinfo = skb_shinfo(skb);
 		struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
 
-- 
2.43.5