mac80211 questions

[Tchang Chen (ST-CO/ENG1.3)]

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

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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