net: sock: replace sk_state_load with inet_sk_state_load and remove sk_state_store

sk_state_load is only used by AF_INET/AF_INET6, so rename it to
inet_sk_state_load and move it into inet_sock.h.

sk_state_store is removed as it is not used any more.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/inet_sock.h

@@ -290,9 +290,32 @@ static inline void inet_sk_copy_descendant(struct sock *sk_to,
 #endif
 
 int inet_sk_rebuild_header(struct sock *sk);
-void inet_sk_set_state(struct sock *sk, int state);
+
+/**
+ * inet_sk_state_load - read sk->sk_state for lockless contexts
+ * @sk: socket pointer
+ *
+ * Paired with inet_sk_state_store(). Used in places we don't hold socket lock:
+ * tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ...
+ */
+static inline int inet_sk_state_load(const struct sock *sk)
+{
+	/* state change might impact lockless readers. */
+	return smp_load_acquire(&sk->sk_state);
+}
+
+/**
+ * inet_sk_state_store - update sk->sk_state
+ * @sk: socket pointer
+ * @newstate: new state
+ *
+ * Paired with inet_sk_state_load(). Should be used in contexts where
+ * state change might impact lockless readers.
+ */
 void inet_sk_state_store(struct sock *sk, int newstate);
 
+void inet_sk_set_state(struct sock *sk, int state);
+
 static inline unsigned int __inet_ehashfn(const __be32 laddr,
 					  const __u16 lport,
 					  const __be32 faddr,

include/net/sock.h

@@ -2333,31 +2333,6 @@ static inline bool sk_listener(const struct sock *sk)
 	return (1 << sk->sk_state) & (TCPF_LISTEN | TCPF_NEW_SYN_RECV);
 }
 
-/**
- * sk_state_load - read sk->sk_state for lockless contexts
- * @sk: socket pointer
- *
- * Paired with sk_state_store(). Used in places we do not hold socket lock :
- * tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ...
- */
-static inline int sk_state_load(const struct sock *sk)
-{
-	return smp_load_acquire(&sk->sk_state);
-}
-
-/**
- * sk_state_store - update sk->sk_state
- * @sk: socket pointer
- * @newstate: new state
- *
- * Paired with sk_state_load(). Should be used in contexts where
- * state change might impact lockless readers.
- */
-static inline void sk_state_store(struct sock *sk, int newstate)
-{
-	smp_store_release(&sk->sk_state, newstate);
-}
-
 void sock_enable_timestamp(struct sock *sk, int flag);
 int sock_get_timestamp(struct sock *, struct timeval __user *);
 int sock_get_timestampns(struct sock *, struct timespec __user *);

net/ipv4/inet_connection_sock.c

@@ -685,7 +685,7 @@ static void reqsk_timer_handler(struct timer_list *t)
 	int max_retries, thresh;
 	u8 defer_accept;
 
-	if (sk_state_load(sk_listener) != TCP_LISTEN)
+	if (inet_sk_state_load(sk_listener) != TCP_LISTEN)
 		goto drop;
 
 	max_retries = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_synack_retries;

net/ipv4/tcp.c

@@ -502,7 +502,7 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
 
 	sock_poll_wait(file, sk_sleep(sk), wait);
 
-	state = sk_state_load(sk);
+	state = inet_sk_state_load(sk);
 	if (state == TCP_LISTEN)
 		return inet_csk_listen_poll(sk);
 
@@ -2916,7 +2916,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
 	if (sk->sk_type != SOCK_STREAM)
 		return;
 
-	info->tcpi_state = sk_state_load(sk);
+	info->tcpi_state = inet_sk_state_load(sk);
 
 	/* Report meaningful fields for all TCP states, including listeners */
 	rate = READ_ONCE(sk->sk_pacing_rate);

net/ipv4/tcp_diag.c

@@ -24,7 +24,7 @@ static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
 {
 	struct tcp_info *info = _info;
 
-	if (sk_state_load(sk) == TCP_LISTEN) {
+	if (inet_sk_state_load(sk) == TCP_LISTEN) {
 		r->idiag_rqueue = sk->sk_ack_backlog;
 		r->idiag_wqueue = sk->sk_max_ack_backlog;
 	} else if (sk->sk_type == SOCK_STREAM) {

net/ipv4/tcp_ipv4.c

@@ -2281,7 +2281,7 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i)
 		timer_expires = jiffies;
 	}
 
-	state = sk_state_load(sk);
+	state = inet_sk_state_load(sk);
 	if (state == TCP_LISTEN)
 		rx_queue = sk->sk_ack_backlog;
 	else

net/ipv6/tcp_ipv6.c

@@ -1795,7 +1795,7 @@ static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
 		timer_expires = jiffies;
 	}
 
-	state = sk_state_load(sp);
+	state = inet_sk_state_load(sp);
 	if (state == TCP_LISTEN)
 		rx_queue = sp->sk_ack_backlog;
 	else