RE: missing RX_FLAG_DECRIPTED in ieee80211_rx_status after first reassociation in 802.11R

["Cédric Debarge - ACKSYS" <cedric.debarge@acksys.fr>]

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Hi Johannes,

	Thank you for you answer.
	Sorry for the answer delay, I wasn't familiar with the kernel tracing features.

	I attached the trace file since it is quite long (about 1400 lines).
	Here are some pointers : 
		Original AP = 90:A4:DE:AA:42:94, channel : 132, ssid : acksyscdtest
		Second AP = 90:A4:DE:AA:41:ED, channel : 132, ssid : acksyscdtest

		When wpa_supplicant is launched, it associates directly with 90:A4:DE:AA:42:94.
		The roaming order is given by the wpa_cli roam command (roam 90:A4:DE:AA:41:ED). You can find it at line 1042 of the traces.
		I used the -T option of wpa_supplicant.

	In order to get cfg80211 traces I had to switch to compat wireless version 2012-12-06 (previous was 2012-09-07). Nevertheless, the behavior seems to remain the same (same exit in ieee80211_key_enable_hw_accel at the first roam).

	Just let me know if you need more information.

Best regards,

Cédric DEBARGE

-----Message d'origine-----
De : Johannes Berg [mailto:johannes@sipsolutions.net] 
Envoyé : mercredi 9 janvier 2013 13:27
À : Cedric Debarge
Cc : linux-wireless@vger.kernel.org
Objet : Re: missing RX_FLAG_DECRIPTED in ieee80211_rx_status after first reassociation in 802.11R

On Tue, 2013-01-08 at 12:11 +0100, Cedric Debarge wrote:
> Hi all,
> 
> 	I dug a little more on this problem and I found that hardware encryption is disabled after the first roam because ieee80211_key_enable_hw_accel fails on the following test :
> 		if (sta && !sta->uploaded) 
> 			goto out_unsupported;
> 
> 	After the first roam, sta->uploaded is tested before sta_info_move_state sets it to true.
> 
> 	At the first association/authentication :
> 	1) sta_info_move_state sets sta->uploaded to true
> 	2) ieee80211_key_enable_hw_accel test it and find it true --> 
> hardware decoding
> 
> 	When the station changes from an AP to another :
> 	1) ieee80211_key_enable_hw_accel test it and find it false --> software decoding
> 	2) sta_info_move_state sets sta->uploaded to true

I cannot reproduce this. Could you obtain tracing information ("trace-cmd record -e cfg80211") on an affected system?

Also a wpa_supplicant debug log would be helpful. Or better yet, use a new supplicant with the "-T" parameter -- this will make its debug information go into the cfg80211 tracing that you record as per above.

johannes


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