ACK for a DATA frame

Dear All,

I learnt that it is the IPW2200BG firmware that handles the
RTS-CTS-DATA-ACK handshake cycle. However, is there any way for me to
determine at the MAC-level (i.e., using ieee80211_tx.c and
ieee80211_rx.c) at what point in time an ACK is received in
correspondence with the DATA frame a node has just transmitted.

For this purpose I wish to use the function ieee80211_rx() appearing
in ieee80211_rx.c file. Within this function, I am trying to see
whether I have received any frame of IEEE80211_STYPE_ACK type with the
following if-clause. Given that the condition is never satified, the
program does not get into and never executed the statments appearing
within the if clause.

   if (WLAN_FC_GET_STYPE == IEEE80211_STYPE_ACK) {

    // perform some calculations
  }

Does anybody know why and please shed some light as to whether there
exists a better way to do the same ?

Thanks in advance for taking you invaluable time to answer my question.

Cheers

Siva

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