netdev - [PATCH net-next 15/20] tcp: tp->urg

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Message-Id: <20211115190249.3936899-16-eric.dumazet@gmail.com>
Date:   Mon, 15 Nov 2021 11:02:44 -0800
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>,
        Arjun Roy <arjunroy@...gle.com>
Subject: [PATCH net-next 15/20] tcp: tp->urg_data is unlikely to be set

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

Use some unlikely() hints in the fast path.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv4/tcp.c       | 10 +++++-----
 net/ipv4/tcp_input.c |  4 ++--
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 313cf648c349a24ab7a04729180ec9b76b2f6aa2..9175e0d729f5e65b5fa39acadc5bf9de715854ad 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -547,7 +547,7 @@ __poll_t tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
 		int target = sock_rcvlowat(sk, 0, INT_MAX);
 		u16 urg_data = READ_ONCE(tp->urg_data);
 
-		if (urg_data &&
+		if (unlikely(urg_data) &&
 		    READ_ONCE(tp->urg_seq) == READ_ONCE(tp->copied_seq) &&
 		    !sock_flag(sk, SOCK_URGINLINE))
 			target++;
@@ -1633,7 +1633,7 @@ int tcp_read_sock(struct sock *sk, read_descriptor_t *desc,
 
 			len = skb->len - offset;
 			/* Stop reading if we hit a patch of urgent data */
-			if (tp->urg_data) {
+			if (unlikely(tp->urg_data)) {
 				u32 urg_offset = tp->urg_seq - seq;
 				if (urg_offset < len)
 					len = urg_offset;
@@ -2326,7 +2326,7 @@ static int tcp_recvmsg_locked(struct sock *sk, struct msghdr *msg, size_t len,
 		u32 offset;
 
 		/* Are we at urgent data? Stop if we have read anything or have SIGURG pending. */
-		if (tp->urg_data && tp->urg_seq == *seq) {
+		if (unlikely(tp->urg_data) && tp->urg_seq == *seq) {
 			if (copied)
 				break;
 			if (signal_pending(current)) {
@@ -2431,7 +2431,7 @@ static int tcp_recvmsg_locked(struct sock *sk, struct msghdr *msg, size_t len,
 			used = len;
 
 		/* Do we have urgent data here? */
-		if (tp->urg_data) {
+		if (unlikely(tp->urg_data)) {
 			u32 urg_offset = tp->urg_seq - *seq;
 			if (urg_offset < used) {
 				if (!urg_offset) {
@@ -2465,7 +2465,7 @@ static int tcp_recvmsg_locked(struct sock *sk, struct msghdr *msg, size_t len,
 		tcp_rcv_space_adjust(sk);
 
 skip_copy:
-		if (tp->urg_data && after(tp->copied_seq, tp->urg_seq)) {
+		if (unlikely(tp->urg_data) && after(tp->copied_seq, tp->urg_seq)) {
 			WRITE_ONCE(tp->urg_data, 0);
 			tcp_fast_path_check(sk);
 		}
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 5ee07a337652696bdebb1117334ff39d88fd0276..3658b9c3dd2b6cd4610603c78509c9af25ddcdbc 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -5604,11 +5604,11 @@ static void tcp_urg(struct sock *sk, struct sk_buff *skb, const struct tcphdr *t
 	struct tcp_sock *tp = tcp_sk(sk);
 
 	/* Check if we get a new urgent pointer - normally not. */
-	if (th->urg)
+	if (unlikely(th->urg))
 		tcp_check_urg(sk, th);
 
 	/* Do we wait for any urgent data? - normally not... */
-	if (tp->urg_data == TCP_URG_NOTYET) {
+	if (unlikely(tp->urg_data == TCP_URG_NOTYET)) {
 		u32 ptr = tp->urg_seq - ntohl(th->seq) + (th->doff * 4) -
 			  th->syn;
 
-- 
2.34.0.rc1.387.gb447b232ab-goog