[ath9k-devel] ath9k, multiple stations, and AMPDUs

[Ben Greear <greearb@candelatech.com>]

On 09/21/2010 11:00 AM, Felix Fietkau wrote:
> On 2010-09-21 7:25 PM, Ben Greear wrote:
>> On 09/21/2010 05:19 AM, Felix Fietkau wrote:
>>> On 2010-09-21 2:08 PM, Ben Greear wrote:
>>
>>>> If you have any more details on this, please let me know.  I'm going to
>>>> attempt to fix it...I certainly have a good test case :)
>>> ath_tx_complete_aggr completes an A-MPDU frame, which typically triggers
>>> the release of the next A-MPDU to the hw queue.
>>> To keep track of the Block ACK window, it needs to look up the TID, for
>>> which it needs a STA pointer. At that level, the driver typically
>>> doesn't have access to the vif.
>>>
>>> It might be possible to fix this by adding another sta lookup helper
>>> function in mac80211 that takes another address argument for the BSSID,
>>> so that it can get the sta entry for the correct vif. I don't know if
>>> Johannes wants something like that though.
>>
>> Could we just poke a pointer to the STA into the ath_buf structure?
> No, that doesn't work because of RCU.

Would it also be bad to use skb->dev to find an STA?

Thanks,
Ben

>
> - Felix
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-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com