QoS prioritization doesn't work correctly and no QoS control fields

Hi all,

I'm trying to work with QoS and have some problems.

After installation of ieee80211-1.2.18 and ipw2200-1.2.2, I see that
prioritization is somehow works. This is how I mark the packets (with
iptables):

DSCP         AC
0x08  -->  AC_BK
0x00  -->  AC_BE
0x28  -->  AC_VI
0x30  -->  AC_VO

With some debugging code in ipw2200.c I observe that all packets correctly
go to different transmission queues according to markings.

PROBLEM 1: when I observe the throughput produced at each access category I
see that packets in AC_VO get transmitted with the highest priority (that's
fine), but there is no any difference in performance between AC_VI, AC_BE
and AC_BK access categories, e.g. AC_BK has the same throughput as AC_VI!
(any idea why?)

PROBLEM 2: when I monitor the traffic I don't see any QoS control field in
802.11 frames. The frames are not of "QoS data" type (see below). It's
strange that prioritization is somehow working (AC_VO has highest
throughput, for sure), but no any QoS control fields. Is this possible? Do
we always need a QoS control field for QoS features? Don't understand how I
can see prioritization without QoS control field...

IEEE 802.11
   Type/Subtype: Unknown (0x14)      <------ not a "QoS data" type
   Frame Control: 0xA045 (Normal)
       Version: 1
       Type: Control frame (1)
       Subtype: 4
       Flags: 0xA0

Thank you!!!
Marco.

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