[AF_IUCV]: postpone receival of iucv-packets

AF_IUCV socket programs may waste Linux storage, because af_iucv
allocates an skb whenever posted by the receive callback routine and
receives the message immediately.
Message receival is now postponed if data from previous callbacks has
not yet been transferred to the receiving socket program. Instead a
message handle is saved in a message queue as a reminder. Once
messages could be given to the receiving socket program, there is
an additional checking for entries in the message queue, followed
by skb allocation and message receival if applicable.

Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/iucv/af_iucv.h

@@ -50,6 +50,12 @@ struct sockaddr_iucv {
 
 
 /* Common socket structures and functions */
+struct sock_msg_q {
+	struct iucv_path	*path;
+	struct iucv_message	msg;
+	struct list_head	list;
+	spinlock_t		lock;
+};
 
 #define iucv_sk(__sk) ((struct iucv_sock *) __sk)
 
@@ -65,6 +71,7 @@ struct iucv_sock {
 	struct iucv_path	*path;
 	struct sk_buff_head	send_skb_q;
 	struct sk_buff_head	backlog_skb_q;
+	struct sock_msg_q	message_q;
 	unsigned int		send_tag;
 };