net: Make RFS socket operations not be inet specific.

Idea from Eric Dumazet.

As for placement inside of struct sock, I tried to choose a place
that otherwise has a 32-bit hole on 64-bit systems.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 9f52880..c6c43bc 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -419,7 +419,7 @@
 	if (sk) {
 		long timeout;
 
-		inet_rps_reset_flow(sk);
+		sock_rps_reset_flow(sk);
 
 		/* Applications forget to leave groups before exiting */
 		ip_mc_drop_socket(sk);
@@ -722,7 +722,7 @@
 {
 	struct sock *sk = sock->sk;
 
-	inet_rps_record_flow(sk);
+	sock_rps_record_flow(sk);
 
 	/* We may need to bind the socket. */
 	if (!inet_sk(sk)->inet_num && inet_autobind(sk))
@@ -737,7 +737,7 @@
 {
 	struct sock *sk = sock->sk;
 
-	inet_rps_record_flow(sk);
+	sock_rps_record_flow(sk);
 
 	/* We may need to bind the socket. */
 	if (!inet_sk(sk)->inet_num && inet_autobind(sk))
@@ -755,7 +755,7 @@
 	int addr_len = 0;
 	int err;
 
-	inet_rps_record_flow(sk);
+	sock_rps_record_flow(sk);
 
 	err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
 				   flags & ~MSG_DONTWAIT, &addr_len);