mac80211 questions

Wed Apr 27 22:05:01 EDT 2011

Which command does association?
I do not see any commands of both wireless extension and iw for scan, associate.

--- On Wed, 4/27/11, Tchang Chen (ST-CO/ENG1.3) <Chen.Tchang at nl.bosch.com> wrote:

From: Tchang Chen (ST-CO/ENG1.3) <Chen.Tchang at nl.bosch.com>
Subject: RE: mac80211 questions
To: "hong zhang" <henryzhang62 at yahoo.com>
Cc: "libnl at lists.infradead.org" <libnl at lists.infradead.org>
Date: Wednesday, April 27, 2011, 5:23 AM

Hello Hong,

Thanks for your reply to my libnl 
questions.
I currently use the old Wireless Extensions to configure my 
link.
I don't think using Wireless Extensions (in stead of iw) is 
the problem, but more the mac80211
or even the link to the hardware 
signals.

After loading the modules (mac80211, rt2x00lib, rt2x00pci 
and rt61pci) for a 
Ralink RT2561 mini-PCI wireless card, I tried to setup a 
wireless link
(essid, channel, rate, end key off, ap have been 
correctly set).

I get the following feedback:

~ # ifconfig wlan0 192.168.2.2 up
phy0 -> 
rt2x00lib_request_firmware: Info - Loading firmware file 'rt2561.bin'.
phy0 
-> rt2x00lib_request_firmware: Info - Firmware detected - version: 
0.8.
phy0 -> rt2x00lib_request_firmware: Info - Firmware checked - 
FW_OK
phy0 -> rt2x00lib_load_firmware: Info - Firmware loaded, retval = 
0.
phy0 -> rt2x00lib_start: Info - Device has been initialized 
'0'.
phy0 -> rt2x00lib_start: Info - Radio has been enabled 
'0'.
ieee80211 phy0: device now idle
phy0 -> rt2x00mac_conf_tx: Info - 
Configured TX queue 0 - CWmin: 3, CWmax: 4, Aifs: 2, TXop: 102.
phy0 -> 
rt2x00mac_conf_tx: Info - Configured TX queue 1 - CWmin: 4, CWmax: 5, Aifs: 2, 
TXop: 188.
phy0 -> rt2x00mac_conf_tx: Info - Configured TX queue 2 - 
CWmin: 5, CWmax: 10, Aifs: 3, TXop: 0.
phy0 -> rt2x00mac_conf_tx: Info - 
Configured TX queue 3 - CWmin: 5, CWmax: 10, Aifs: 7, TXop: 0.
ieee80211 phy0: device no longer idle - scanning
ieee80211 
phy0: device now idle

iwconfig
lo        no 
wireless extensions.

eth0      no wireless 
extensions.

wlan0     IEEE 802.11bg  
ESSID:"CTC"

Mode:Managed  Frequency:2.437 GHz  Access Point: 
Not-Associated

Tx-Power=20 dBm

Retry  long limit:7   RTS thr:off   Fragment 
thr:off
          Encryption 
key:off
          Power 
Management:off

The system did not manage to associate with the 
AP.

Q1: What can be the reason(s) for not obtaining an 
association with the AP ?

Q2:  Where can I find more detailed information about the corresponding action 
sequences ?

Q3: Which source files in mac80211 are involved 
?
       I could not locate 
net/mac80211/ieee80211_sta.c in 2.6.37-4.

Q4: Do you perhaps have any further suggestions how to 
debug this issue ?

Hope you can help me again,

Best regards,

Chen

From: hong zhang [mailto:henryzhang62 at yahoo.com] 

Sent: Wednesday, April 27, 2011 3:10 AM
To: 
libnl at lists.infradead.org; Tchang Chen (ST-CO/ENG1.3)
Subject: Re: 
Libnl questions

--- On 
      Tue, 4/26/11, Tchang Chen (ST-CO/ENG1.3) 
      <Chen.Tchang at nl.bosch.com> wrote:

From: Tchang Chen 
        (ST-CO/ENG1.3) <Chen.Tchang at nl.bosch.com>
Subject: Libnl 
        questions
To: "libnl at lists.infradead.org" 
        <libnl at lists.infradead.org>
Date: Tuesday, April 26, 2011, 4:16 
        AM

        #yiv62061886  .yiv62061886EmailQuote {
PADDING-LEFT:4pt;MARGIN-LEFT:1pt;BORDER-LEFT:#800000 2px solid;}

        Hi,

        I would like to use iw-0.9.22 in combination with cfg80211, libnl 
        and Linux kernel 2.6.37-4.
        I noticed that cfg80211 is part of the Linux kernel distribution 
        2.6.37-4.

        Q1: Can I use the latest libnl-3.0  in combination with the 
        software mentioned above ?
              Or do I have to apply an earlier 
        version ? If so, which version will fit best ?

ANS: Yes, you 
        should be able to do it.

        Q2: I understand that nl80211 and cfg80211 are intended to replace 
        Wireless-Extensions.
              Do is the additional value of 
        nl80211 ? Will cfg80211 be sufficient for setup and configuration 
?

ANS: Yes, iw is degined to communicate with wireless driver 
        using nl80211/cfg80211 and wireless stack. 

        Q3: I suspect that libnl should be implemented as user kernel 
        module in kernel space.
              Is this assumption correct ?

 ANS: Actually, libnl is used for user space and kernel 
        space.

        Q4: Are there any other issues, which should be taken in mind  
        for achieving a succesful implementation ?

ANS: You use it and tell us what you find 
        out.

        My hardware platform: 
        PetaLinux v2.1 (embedded Linux 2.6.37-4 for a MicroBlaze softcore 
        processor on a FPGA)

        Hope you can help me with these questions,

        Thx and best regards,

        Chen

        Chen C. Tchang
        BOSCH Security systems B.V.
        ST-CO/ENG1.3 Development
        Kapittelweg 10,
        4827 HG Breda
        The Netherlands

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