sctp: Tag messages that can be Nagle delayed at creation.

When we create the sctp_datamsg and fragment the user data,
we know exactly if we are sending full segments or not and
how they might be bundled.  During this time, we can mark
messages a Nagle capable or not.  This makes the check at
transmit time much simpler.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>

net/sctp/output.c

@@ -674,7 +674,7 @@ static sctp_xmit_t sctp_packet_can_append_data(struct sctp_packet *packet,
 		 * Don't delay large message writes that may have been
 		 * fragmeneted into small peices.
 		 */
-		if ((len < max) && (chunk->msg->msg_size < max)) {
+		if ((len < max) && chunk->msg->can_delay) {
 			retval = SCTP_XMIT_NAGLE_DELAY;
 			goto finish;
 		}