Update ofdatapath man-page for --no-slicing option.

udatapath/ofdatapath.8.in

@@ -98,6 +98,14 @@ network device on \fB-L\fR or \fB--local-port\fR.
 Do not provide a local port as part of the datapath.  When this option
 is used, the switch will not support in-band control.
 
+.TP
+\fB--no-slicing\fR
+Disable slicing (no queue configuration to ports). When this option
+is used, the switch will have 0 queues, and therefore no
+slicing-related functionality is supported. This option is useful when
+run-time dependencies for slicing (tc and related kernel
+configuration) are not met.
+
 .TP
 \fB-d\fR, \fB--datapath-id=\fIdpid\fR
 Specifies the OpenFlow datapath ID (a 48-bit number that uniquely