Net: First bug fixes for modified write buffer logic

ChangeLog

@@ -7461,4 +7461,7 @@
 	* tools/mkfsdata.pl:  Apparently, the trailing the 0x00 in http server
 	  files is seen as a bug in javascript and images.  From Max/Himax
 	  (2014-6-19).
+	* net/ and include/nutt/net (many files):  Conversion of the TCP
+	  write buffering logic to use I/O buffer chains (not tested on initial
+	  check-in) (2014-6-22).
 

net/net_send_buffered.c

@@ -665,7 +665,7 @@ ssize_t psock_send(FAR struct socket *psock, FAR const void *buf, size_t len,
         }
       else
         {
-          FAR struct tcp_wrbuffer_s *wrb = tcp_wrbuffer_alloc();
+          FAR struct tcp_wrbuffer_s *wrb;
 
           /* Set up the callback in the connection */
 
@@ -690,6 +690,7 @@ ssize_t psock_send(FAR struct socket *psock, FAR const void *buf, size_t len,
                */
 
               sq_addlast(&wrb->wb_node, &conn->write_q);
+              nvdbg("Queued WRB=%p pktlen=%d\n", wrb, WRB_PKTLEN(wrb));
 
               /* Notify the device driver of the availability of TX data */
 

net/net_sockets.c

@@ -105,6 +105,12 @@ void net_initialize(void)
 
   uip_initialize();
 
+  /* Initialize I/O buffering */
+
+#ifdef CONFIG_NET_IOB
+  iob_initialize();
+#endif
+
 #ifdef CONFIG_NET_ROUTE
   /* Initialize the routing table */