QOS Support in athwifi Sample

Hi ,
I am trying to enable wme inside the athwifi sample available with wdk. For data frame transmission i am modifying the header filed by adding extra QoS fields at the end . but when i capture the frame in air i found that this field is overwritten with the LLC.

Is the HAL functions available with athwifi is checking the frame type data and subtype QoS before adding the LLC field.

Thanks in advance

Regards
Niraj Jha