inet: move inet->defer_connect to inet->inet_flags

Make room in struct inet_sock by removing this bit field,
using one available bit in inet_flags instead.

Also move local_port_range to fill the resulting hole,
saving 8 bytes on 64bit arches.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/inet_sock.h

@@ -229,21 +229,18 @@ struct inet_sock {
 	__u8			min_ttl;
 	__u8			mc_ttl;
 	__u8			pmtudisc;
-	__u8			defer_connect:1; /* Indicates that fastopen_connect is set
-						  * and cookie exists so we defer connect
-						  * until first data frame is written
-						  */
 	__u8			rcv_tos;
 	__u8			convert_csum;
 	int			uc_index;
 	int			mc_index;
 	__be32			mc_addr;
-	struct ip_mc_socklist __rcu	*mc_list;
-	struct inet_cork_full	cork;
 	struct {
 		__u16 lo;
 		__u16 hi;
 	}			local_port_range;
+
+	struct ip_mc_socklist __rcu	*mc_list;
+	struct inet_cork_full	cork;
 };
 
 #define IPCORK_OPT	1	/* ip-options has been held in ipcork.opt */
@@ -270,6 +267,7 @@ enum {
 	INET_FLAGS_IS_ICSK	= 16,
 	INET_FLAGS_NODEFRAG	= 17,
 	INET_FLAGS_BIND_ADDRESS_NO_PORT = 18,
+	INET_FLAGS_DEFER_CONNECT = 19,
 };
 
 /* cmsg flags for inet */

net/ipv4/af_inet.c

@@ -656,7 +656,7 @@ int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 		err = -EISCONN;
 		goto out;
 	case SS_CONNECTING:
-		if (inet_sk(sk)->defer_connect)
+		if (inet_test_bit(DEFER_CONNECT, sk))
 			err = is_sendmsg ? -EINPROGRESS : -EISCONN;
 		else
 			err = -EALREADY;
@@ -679,7 +679,7 @@ int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 
 		sock->state = SS_CONNECTING;
 
-		if (!err && inet_sk(sk)->defer_connect)
+		if (!err && inet_test_bit(DEFER_CONNECT, sk))
 			goto out;
 
 		/* Just entered SS_CONNECTING state; the only

net/ipv4/inet_diag.c

@@ -192,7 +192,7 @@ int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
 	inet_sockopt.nodefrag	= inet_test_bit(NODEFRAG, sk);
 	inet_sockopt.bind_address_no_port = inet_test_bit(BIND_ADDRESS_NO_PORT, sk);
 	inet_sockopt.recverr_rfc4884 = inet_test_bit(RECVERR_RFC4884, sk);
-	inet_sockopt.defer_connect = inet->defer_connect;
+	inet_sockopt.defer_connect = inet_test_bit(DEFER_CONNECT, sk);
 	if (nla_put(skb, INET_DIAG_SOCKOPT, sizeof(inet_sockopt),
 		    &inet_sockopt))
 		goto errout;

net/ipv4/tcp.c

@@ -583,7 +583,8 @@ __poll_t tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
 
 		if (urg_data & TCP_URG_VALID)
 			mask |= EPOLLPRI;
-	} else if (state == TCP_SYN_SENT && inet_sk(sk)->defer_connect) {
+	} else if (state == TCP_SYN_SENT &&
+		   inet_test_bit(DEFER_CONNECT, sk)) {
 		/* Active TCP fastopen socket with defer_connect
 		 * Return EPOLLOUT so application can call write()
 		 * in order for kernel to generate SYN+data
@@ -1007,7 +1008,7 @@ int tcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg, int *copied,
 	tp->fastopen_req->size = size;
 	tp->fastopen_req->uarg = uarg;
 
-	if (inet->defer_connect) {
+	if (inet_test_bit(DEFER_CONNECT, sk)) {
 		err = tcp_connect(sk);
 		/* Same failure procedure as in tcp_v4/6_connect */
 		if (err) {
@@ -1025,7 +1026,7 @@ int tcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg, int *copied,
 	if (tp->fastopen_req) {
 		*copied = tp->fastopen_req->copied;
 		tcp_free_fastopen_req(tp);
-		inet->defer_connect = 0;
+		inet_clear_bit(DEFER_CONNECT, sk);
 	}
 	return err;
 }
@@ -1066,7 +1067,8 @@ int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size)
 			zc = MSG_SPLICE_PAGES;
 	}
 
-	if (unlikely(flags & MSG_FASTOPEN || inet_sk(sk)->defer_connect) &&
+	if (unlikely(flags & MSG_FASTOPEN ||
+		     inet_test_bit(DEFER_CONNECT, sk)) &&
 	    !tp->repair) {
 		err = tcp_sendmsg_fastopen(sk, msg, &copied_syn, size, uarg);
 		if (err == -EINPROGRESS && copied_syn > 0)
@@ -3088,7 +3090,7 @@ int tcp_disconnect(struct sock *sk, int flags)
 
 	/* Clean up fastopen related fields */
 	tcp_free_fastopen_req(tp);
-	inet->defer_connect = 0;
+	inet_clear_bit(DEFER_CONNECT, sk);
 	tp->fastopen_client_fail = 0;
 
 	WARN_ON(inet->inet_num && !icsk->icsk_bind_hash);

net/ipv4/tcp_fastopen.c

@@ -451,7 +451,7 @@ bool tcp_fastopen_defer_connect(struct sock *sk, int *err)
 
 	if (tp->fastopen_connect && !tp->fastopen_req) {
 		if (tcp_fastopen_cookie_check(sk, &mss, &cookie)) {
-			inet_sk(sk)->defer_connect = 1;
+			inet_set_bit(DEFER_CONNECT, sk);
 			return true;
 		}
 

net/mptcp/protocol.c

@@ -1686,7 +1686,7 @@ static int mptcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg,
 		if (!mptcp_disconnect(sk, 0))
 			sk->sk_socket->state = SS_UNCONNECTED;
 	}
-	inet_sk(sk)->defer_connect = 0;
+	inet_clear_bit(DEFER_CONNECT, sk);
 
 	return ret;
 }
@@ -1704,7 +1704,8 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 
 	lock_sock(sk);
 
-	if (unlikely(inet_sk(sk)->defer_connect || msg->msg_flags & MSG_FASTOPEN)) {
+	if (unlikely(inet_test_bit(DEFER_CONNECT, sk) ||
+		     msg->msg_flags & MSG_FASTOPEN)) {
 		int copied_syn = 0;
 
 		ret = mptcp_sendmsg_fastopen(sk, msg, len, &copied_syn);
@@ -3601,7 +3602,7 @@ static int mptcp_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 	if (err < 0)
 		goto out;
 
-	inet_sk(sk)->defer_connect = inet_sk(ssk)->defer_connect;
+	inet_assign_bit(DEFER_CONNECT, sk, inet_test_bit(DEFER_CONNECT, ssk));
 
 out:
 	if (!msk->fastopening)
@@ -3827,7 +3828,8 @@ static __poll_t mptcp_poll(struct file *file, struct socket *sock,
 			mask |= EPOLLOUT | EPOLLWRNORM;
 		else
 			mask |= mptcp_check_writeable(msk);
-	} else if (state == TCP_SYN_SENT && inet_sk(sk)->defer_connect) {
+	} else if (state == TCP_SYN_SENT &&
+		   inet_test_bit(DEFER_CONNECT, sk)) {
 		/* cf tcp_poll() note about TFO */
 		mask |= EPOLLOUT | EPOLLWRNORM;
 	}