188       // Fill in the QoS control field in the MAC header

   188       // Fill in the QoS control field in the MAC header

   189       tid = QosUtilsGetTidForPacket (packet);

   189       tid = QosUtilsGetTidForPacket (packet);

   190       // Any value greater than 7 is invalid and likely indicates that

   190       // Any value greater than 7 is invalid and likely indicates that

   191       // the packet had no QoS tag, so we revert to zero, which'll

   191       // the packet had no QoS tag, so we revert to zero, which'll

   192       // mean that AC_BE is used.

   192       // mean that AC_BE is used.

   194         {

   194         {

   195           tid = 0;

   195           tid = 0;

   196         }

   196         }

   197       hdr.SetQosTid (tid);

   197       hdr.SetQosTid (tid);

   198     }

   198     }