Subject: iwl3945 lists supported rates backwards
From: Pavel Roskin <proski@gnu.org>
To: ipw3945-devel@lists.sourceforge.net, linux-wireless@vger.kernel.org
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Date: Fri, 19 Oct 2007 18:15:09 -0400
Message-Id: <1192832109.19766.14.camel@dv> (sfid-20071020_011633_265754_8C731778)
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Sender: linux-wireless-owner@vger.kernel.org


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Hello!

My iwl3945 device cannot associate to Linksys BEFW11S4.  The AP reports
code 18 (unsupported rates).

I tried the current master branch from iwlwifi repository with the
current wireless-2.6/everything kernel patched by mac80211 10.0.0, and
it still exhibits the problem.

It turns out the driver sends CCK rates as extended and OFDM rates as
"non-extended":

    Tagged parameters (23 bytes)
        SSID parameter set: "WTEST"
            Tag Number: 0 (SSID parameter set)
            Tag length: 5
            Tag interpretation: WTEST
        Supported Rates: 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0 
            Tag Number: 1 (Supported Rates)
            Tag length: 8
            Tag interpretation: Supported rates: 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0  [Mbit/sec]
        Extended Supported Rates: 1.0 2.0 5.5 11.0 
            Tag Number: 50 (Extended Supported Rates)
            Tag length: 4
            Tag interpretation: Supported rates: 1.0 2.0 5.5 11.0  [Mbit/sec]

The association request captured by WireShark is attached.

I tried swapping WLAN_EID_SUPP_RATES and WLAN_EID_EXT_SUPP_RATES in the
sources, but it didn't work.  Maybe mac80211 rewrites the request, I
don't know.

Also, iwl3945 refuses to scan more than several times, and the only
workaround is to reload the module.  Maybe the association failure
triggers that.  If it's not a known problem, I can look closer.

-- 
Regards,
Pavel Roskin

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