Add Transfer Size Option to tftp

Optionally add RFC 2349 "Transfer Size Option", so we can minimize the
time spent sending data over the UART (now print a single line during a
tftp transfer).

 - If turned on (CONFIG_TFTP_TSIZE), U-Boot asks for the size of the file.
 - if receives the file size, a single line (50 chars) are printed.
     one hash mark == 2% of the file downloaded.
 - if it doesn't receive the file size (the server doesn't support RFC
     2349, prints standard hash marks (one mark for each UDP frame).

Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

net/tftp.c

@@ -56,6 +56,10 @@ static ulong	TftpLastBlock;		/* last packet sequence number received */
 static ulong	TftpBlockWrap;		/* count of sequence number wraparounds */
 static ulong	TftpBlockWrapOffset;	/* memory offset due to wrapping	*/
 static int	TftpState;
+#ifdef CONFIG_TFTP_TSIZE
+static int	TftpTsize;		/* The file size reported by the server */
+static short	TftpNumchars;		/* The number of hashes we printed      */
+#endif
 
 #define STATE_RRQ	1
 #define STATE_DATA	2
@@ -202,6 +206,10 @@ TftpSend (void)
 		sprintf((char *)pkt, "%lu", TIMEOUT / 1000);
 		debug("send option \"timeout %s\"\n", (char *)pkt);
 		pkt += strlen((char *)pkt) + 1;
+#ifdef CONFIG_TFTP_TSIZE
+		memcpy((char *)pkt, "tsize\0000\0", 8);
+		pkt += 8;
+#endif
 		/* try for more effic. blk size */
 		pkt += sprintf((char *)pkt,"blksize%c%d%c",
 				0,TftpBlkSizeOption,0);
@@ -313,8 +321,14 @@ TftpHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 					simple_strtoul((char*)pkt+i+8,NULL,10);
 				debug("Blocksize ack: %s, %d\n",
 					(char*)pkt+i+8,TftpBlkSize);
-				break;
 			}
+#ifdef CONFIG_TFTP_TSIZE
+			if (strcmp ((char*)pkt+i,"tsize") == 0) {
+				TftpTsize = simple_strtoul((char*)pkt+i+6,NULL,10);
+				debug("size = %s, %d\n",
+					 (char*)pkt+i+6, TftpTsize);
+			}
+#endif
 		}
 #ifdef CONFIG_MCAST_TFTP
 		parse_multicast_oack((char *)pkt,len-1);
@@ -340,7 +354,16 @@ TftpHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 			TftpBlockWrap++;
 			TftpBlockWrapOffset += TftpBlkSize * TFTP_SEQUENCE_SIZE;
 			printf ("\n\t %lu MB received\n\t ", TftpBlockWrapOffset>>20);
-		} else {
+		}
+#ifdef CONFIG_TFTP_TSIZE
+		else if (TftpTsize) {
+			while (TftpNumchars < NetBootFileXferSize * 50 / TftpTsize) {
+				putc('#');
+				TftpNumchars++;
+			}
+		}
+#endif
+		else {
 			if (((TftpBlock - 1) % 10) == 0) {
 				putc ('#');
 			} else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0) {
@@ -434,6 +457,13 @@ TftpHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 			 *	We received the whole thing.  Try to
 			 *	run it.
 			 */
+#ifdef CONFIG_TFTP_TSIZE
+			/* Print out the hash marks for the last packet received */
+			while (TftpTsize && TftpNumchars < 49) {
+				putc('#');
+				TftpNumchars++;
+			}
+#endif
 			puts ("\ndone\n");
 			NetState = NETLOOP_SUCCESS;
 		}
@@ -563,6 +593,10 @@ TftpStart (void)
 #ifdef CONFIG_MCAST_TFTP
 	mcast_cleanup();
 #endif
+#ifdef CONFIG_TFTP_TSIZE
+	TftpTsize = 0;
+	TftpNumchars = 0;
+#endif
 
 	TftpSend ();
 }