Fix --dscp (esnet#1162)

TOS = DSCP * 4; so shift DSCP << 2

src/dscp.c

@@ -136,10 +136,11 @@ parse_qos(const char *cp)
 			return ipqos[i].value;
 	}
 	/* Try parsing as an integer */
+    /* Max DSCP value is 2**6 - 1 */
 	val = strtol(cp, &ep, 0);
-	if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
+	if (*cp == '\0' || *ep != '\0' || val < 0 || val > 63)
 		return -1;
-	return val;
+	return val << 2;
 }
 
 const char *

src/iperf3.1

@@ -354,7 +354,8 @@ i.e. 52, 064 and 0x34 all specify the same value.
 .TP
 .BR "--dscp " \fIdscp\fR
 set the IP DSCP bits.  Both numeric and symbolic values are accepted. Numeric
-values can be specified in decimal, octal and hex (see --tos above).
+values can be specified in decimal, octal and hex (see --tos above). To set
+both the DSCP bits and the ECN bits, use --tos.
 .TP
 .BR -L ", " --flowlabel " \fIn\fR"
 set the IPv6 flow label (currently only supported on Linux)