Scanning problem for hidden SSIDs

[Dan Williams]

On Mon, 2007-06-25 at 13:57 +0200, Holger Schurig wrote:
> So far I don't have that much success. My function looks like this:

Did you test this out on USB 8388 reference dongle too, and did that
fail to generate the expected frame?

Dan

> int libertas_send_null_packet(wlan_private *priv, u8 pwr_mgmt)
> {
>         wlan_adapter *adapter = priv->adapter;
>         struct txpd nulltxpd;
>         int ret = -1;
> 
>         lbs_deb_enter_args(LBS_DEB_SCAN, "pwr_mgmt %02x", pwr_mgmt);
> 
>         if (adapter->surpriseremoved)
>                 goto out;
> 
>         memset(&nulltxpd, 0, sizeof(nulltxpd));
>         nulltxpd.tx_control = cpu_to_le32(adapter->pkttxctrl);
>         nulltxpd.powermgmt = pwr_mgmt;
>         nulltxpd.tx_packet_location = sizeof(nulltxpd);
> 
>         memcpy(priv->adapter->tmptxbuf, &nulltxpd, sizeof(nulltxpd));
> 
>         ret = priv->hw_host_to_card(priv, MVMS_DAT,
>                                     priv->adapter->tmptxbuf,
>                                     sizeof(nulltxpd));
> 
> out:
>         lbs_deb_enter_args(LBS_DEB_SCAN, "ret %d", ret);
>         return ret;
> }
> 
> and get's called this way:
> 
> 
>         // Bit 0: null packet
>         // Bit 1: override firmware power management (activates Bit 2)
>         // Bit 2: power management bit on
>         ret = libertas_send_null_packet(priv, 0x7);
> or
>         ret = libertas_send_null_packet(priv, 0x3);
> 
> 
> My debug output says:
> 
> libertas enter: libertas_send_null_packet(pwr_mgmt 07):296
> libertas_cs MVMS_DAT: 00 00 00 00 00 00 00 00 18 00 00 00 00 00 00 00
> libertas_cs MVMS_DAT: 00 00 00 00 00 07 00 00
> ##outw 00000014>0018
> ##outsw 00000016>(12 bytes)
> ##outw 00000000>0001
> ##outw 00000002>0001
> 
> So, my txpd looks like this:
> 
> TxStatus        00 00 00 00
> TxControl       00 00 00 00
> TxPacketLocat   18 00 00 00
> TxPacketLength  00 00
> TxDestAddrHi    00 00
> TxDestAddrLo    00 00 00 00
> Priority        00
> Flags           07
> Reserved        00 00
> 
> However, the card doesn't send any packet at all. I've also tried
> to set the TxPacketLocation to 0, or to set the TxDestAddr to the
> broadcast address. Whatever I do, the card won't send the power
> management packets other cards send.
>