2010/11/2 Björn Smedman <bjorn.smedman@xxxxxxxxxxx>:
> On Mon, Nov 1, 2010 at 4:43 PM, Ben Gamari <bgamari@xxxxxxxxx> wrote:
>> On Mon, 1 Nov 2010 16:17:23 +0100, Björn Smedman <bjorn.smedman@xxxxxxxxxxx> wrote:
>>> Hi all,
>>>
>>> I have an application that creates and destroys a lot of ap vifs and
>>> does a lot of monitor frame injection. The recent ath9k rx locking
>>> fixes have helped with stability in this use-case but there still
>>> seems to be some tx/beacon related race condition(s). These manifests
>>> themselves as follows on an AR913x based router running
>>> compat-wireless-2010-10-19 (with locking fixes etc from openwrt):
>>>
>>> 1. TX DMA hangs under simultaneous high RX and TX load
>>> 2. TX is completely hung but chip is never reset
>>
>> I have also observed both of these behaviors with just a standard
>> hostapd single VIF configuration. Quite annoying. It seems to be better
>> with recent wireless-testing trees.
>>
>> - Ben
>
> I just posted "[RFC] ath9k: fix tx queue selection" with a patch that
> fixes (or at least reduces) these two for me. I'm not sure it is the
> whole story but at least in theory 1 could be caused by locking one tx
> queue and actually transmitting on another. 2 is probably caused by
> stopping one mac80211 queue and then starting another.
Problem 1 is still there. After 5-15 hours of varying rx/tx frame
injection load something like this happens and the chip goes
deaf/mute:
Jan 1 00:18:33 user.debug kernel: ath: DMA failed to stop in 10
ms AR_CR=0x00000024 AR_DIAG_SW=0x40000020
Jan 1 00:18:33 user.debug kernel: ath: DMA failed to stop in 10
ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020
Jan 1 00:18:33 user.debug kernel: ath: ah->misc_mode 0xc
Jan 1 00:18:33 user.debug kernel: ath: Setting CFG 0x10a
Jan 1 00:18:43 user.debug kernel: ath: Timeout while waiting
for nf to load: AR_PHY_AGC_CONTROL=0x40d22
Jan 1 00:18:44 user.debug kernel: ath: DMA failed to stop in 10
ms AR_CR=0x00000024 AR_DIAG_SW=0x40000020
Jan 1 00:18:44 user.debug kernel: ath: DMA failed to stop in 10
ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020
Jan 1 00:18:44 user.debug kernel: ath: ah->misc_mode 0xc
Jan 1 00:18:44 user.debug kernel: ath: Setting CFG 0x10a
Problem 2 seems gone though.
/Björn
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