linux-kernel - Re: 2.6.25-rc2 regression in rt61pci wireless driver

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Message-ID: <20080226224410.4b9216e5@morte>
Date:	Tue, 26 Feb 2008 22:44:10 +0100
From:	Stefano Brivio <stefano.brivio@...imi.it>
To:	"Ivo Van Doorn" <ivdoorn@...il.com>
Cc:	"John W. Linville" <linville@...driver.com>,
	"Chris Clayton" <chris2553@...glemail.com>,
	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	johannes@...solutions.net
Subject: Re: 2.6.25-rc2 regression in rt61pci wireless driver

On Tue, 26 Feb 2008 21:30:38 +0100
"Ivo Van Doorn" <ivdoorn@...il.com> wrote:

> rt2x00 is known to be less sensitive then the legacy drivers, scanning
> produces less and more inconsistent results (Not all AP's are reported,
> even when that AP has a high rssi), and the reported RSSI is often
> much lower then expected with the distance to the AP.
> I have compared many register dumps, but have never managed to
> find a real register setting that might cause this. So what might be
> the problem is that rt2x00 is not reporting the RSSI correctly to mac80211.

No, we don't care at all about RSSI in rc80211-pid.

> I have to admit that I haven't looked into the 'pid' algorithm closely,
> but could it be that some fields in the tx status report upon txdone
> are being treated as "very important" while the driver doesn't report it
> (For example ack signal strength)?

The only important thing drivers should report back to mac80211 are ACKed
frames. In rc80211-pid (and it's just the same in rc80211-simple) the only
inputs from mac80211 are succesfully (re)transmitted frames and failed
frames.


-- 
Ciao
Stefano
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