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From: Denis Kenzior <denkenz@gmail.com>
To: Alexander Wetzel <alexander@wetzel-home.de>,
	Arend Van Spriel <arend.vanspriel@broadcom.com>,
	Kalle Valo <kvalo@codeaurora.org>,
	Maya Erez <merez@codeaurora.org>
Cc: Ahmad Masri <amasri@codeaurora.org>,
	linux-wireless@vger.kernel.org, wil6210@qti.qualcomm.com
Subject: Re: [PATCH 04/11] wil6210: fix PTK re-key race
Date: Tue, 17 Sep 2019 10:32:08 -0500
Message-ID: <31dd258c-7ff5-005b-9dee-b4753e3e5250@gmail.com> (raw)
In-Reply-To: <46f1141c-929c-9686-017d-fe4305d9c922@wetzel-home.de>

Hi Alexander,

> And that the intend of it is to replace the "old" path.
Correct.

> 
> So the best way forward here would be to
> 
> 1) implement the patch here to work around the problem without 
> control_port or the theoretical QDISC bypass
> 2) start implementing control port for the future.
> 
> correct?
> 

I don't know what the right answer is, but it seems strange to me that 
we developed a 'better way', upstreamed it several years ago, but are 
still trying to kludge around adding special flags to what is now 
considered a legacy approach.  Also disconcerting that not a single 
fullmac driver has added support for this 'better way' yet.

> 
>> CONTROL_PORT was added specifically to take care of the re-keying 
>> races and can be extended with additional attributes over time, as 
>> needed (perhaps for extended key id, etc).  Also note that in our 
>> testing CONTROL_PORT is _way_ faster than PAE socket...
>>
> 
> Extended Key ID is pretty robust when rekeying and the driver/card only 
> has to take care to not mix KeyIDs within one A-MPDU. It's no problem 
> encrypting eapol#4 with the new key. You can even encrypt it at the 
> initial connect and it will work. Basically all races the "classical" 
> rekey has to work around go away.
> 
> For "normal" rekeys it's working pretty well with ath9k and iwlwifi even 
> without control_port and just learned some weeks ago that QDISC could 
> still cause issues...

Okay, if control port doesn't need to handle extended keys then even better.

By the way, thanks for your earlier explanation (upthread).

Regards,
-Denis

  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-08  8:32 [PATCH 00/11] wil6210 patches Maya Erez
2019-09-08  8:32 ` [PATCH 01/11] wil6210: add wil_netif_rx() helper function Maya Erez
2019-09-12 15:08   ` Kalle Valo
2019-09-08  8:32 ` [PATCH 02/11] wil6210: add support for pci linkdown recovery Maya Erez
2019-09-12 15:22   ` Kalle Valo
2019-09-08  8:32 ` [PATCH 03/11] wil6210: add debugfs to show PMC ring content Maya Erez
2019-09-08  8:32 ` [PATCH 04/11] wil6210: fix PTK re-key race Maya Erez
2019-09-10 13:23   ` Kalle Valo
2019-09-11  7:50     ` Arend Van Spriel
2019-09-11 18:32     ` Alexander Wetzel
2019-09-12 17:39       ` Denis Kenzior
2019-09-12 21:04         ` Alexander Wetzel
2019-09-13  8:04           ` Arend Van Spriel
2019-09-13 14:33             ` Denis Kenzior
2019-09-13 20:48               ` Alexander Wetzel
2019-09-17 15:32                 ` Denis Kenzior [this message]
2019-09-13 18:43             ` Alexander Wetzel
2019-09-08  8:32 ` [PATCH 05/11] wil6210: make sure DR bit is read before rest of the status message Maya Erez
2019-09-08  8:32 ` [PATCH 06/11] wil6210: verify cid value is valid Maya Erez
2019-09-08  8:32 ` [PATCH 07/11] wil6210: properly initialize discovery_expired_work Maya Erez
2019-09-08  8:32 ` [PATCH 08/11] wil6210: report boottime_ns in scan results Maya Erez
2019-09-08  8:32 ` [PATCH 09/11] wil6210: use writel_relaxed in wil_debugfs_iomem_x32_set Maya Erez
2019-09-08  8:32 ` [PATCH 10/11] wil6210: fix RX short frame check Maya Erez
2019-09-08  8:32 ` [PATCH 11/11] wil6210: ignore reset errors for FW during probe Maya Erez

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