From nobody@FreeBSD.org  Sun Jan 20 06:22:22 2013
Return-Path: <nobody@FreeBSD.org>
Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115])
	by hub.freebsd.org (Postfix) with ESMTP id 1BF3D5A4
	for <freebsd-gnats-submit@FreeBSD.org>; Sun, 20 Jan 2013 06:22:22 +0000 (UTC)
	(envelope-from nobody@FreeBSD.org)
Received: from red.freebsd.org (red.freebsd.org [IPv6:2001:4f8:fff6::22])
	by mx1.freebsd.org (Postfix) with ESMTP id 0CC881DA
	for <freebsd-gnats-submit@FreeBSD.org>; Sun, 20 Jan 2013 06:22:22 +0000 (UTC)
Received: from red.freebsd.org (localhost [127.0.0.1])
	by red.freebsd.org (8.14.5/8.14.5) with ESMTP id r0K6MLgT072583
	for <freebsd-gnats-submit@FreeBSD.org>; Sun, 20 Jan 2013 06:22:21 GMT
	(envelope-from nobody@red.freebsd.org)
Received: (from nobody@localhost)
	by red.freebsd.org (8.14.5/8.14.5/Submit) id r0K6MLDg072582;
	Sun, 20 Jan 2013 06:22:21 GMT
	(envelope-from nobody)
Message-Id: <201301200622.r0K6MLDg072582@red.freebsd.org>
Date: Sun, 20 Jan 2013 06:22:21 GMT
From: Adrian Chadd <adrian@FreeBSD.org>
To: freebsd-gnats-submit@FreeBSD.org
Subject: [ath] high volumes of PHY errors lead to BB/MAC hangs and resets
X-Send-Pr-Version: www-3.1
X-GNATS-Notify:

>Number:         175446
>Category:       kern
>Synopsis:       [ath] high volumes of PHY errors lead to BB/MAC hangs and resets
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-wireless
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Jan 20 06:30:00 UTC 2013
>Closed-Date:    
>Last-Modified:  Sun Jan 20 07:14:25 UTC 2013
>Originator:     Adrian Chadd
>Release:        
>Organization:
>Environment:
>Description:
There seem to be some situations where high volumes of PHY errors lead to BB and MAC hangs.

These have been observed on the AR9220/AR9280 and later chips. It doesn't seem to affect the AR5416/AR9160 for some reason (and not the earlier chips as well.)

This PR will track the changes made to try and trace down and fix the specific issue(s) surrounding this particular issue.
>How-To-Repeat:
Enable radar/spectral scan and do some traffic.
>Fix:
The specific fixes I've been told about:

* AR9280, AR9285, AR9287 - don't do PHY error accounting, use the hardware counters;
* The bug here has to do with zero-length DMA frames and some issues with them in the RX FIFO;
* Radar and spectral scan frames don't cause issues - they're not zero-length payload frames.

>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->freebsd-wireless 
Responsible-Changed-By: adrian 
Responsible-Changed-When: Sun Jan 20 07:14:15 UTC 2013 
Responsible-Changed-Why:  
reassign 


http://www.freebsd.org/cgi/query-pr.cgi?pr=175446 
>Unformatted:
