Re: Bisected 3.9 regression for iwl4965 connection problem to 1672c0e3

Emmanuel Grumbach
2013-05-07T09:42:30Z

>> > > But if so, I would also see
>> > > the breakage on my setup, but I don't - it works quite well here.
>> >
>> > Are you testing on a passive channel? Try with a large beacon interval.
>>
>> I think most likely what happens is that it's on a passive channel, and
>> the firmware drops the TX packet with a bad status. Before the patch,
>> we'd just wait sitting on the channel for HZ/5 (200ms) before trying
>> again, with the patch we immediately retransmit the packet, which will
>> fail again and again until the firmware received a beacon.
>>
>> If you look at iwlwifi/dvm/, it has some passive_no_rx workaround for
>> this, which I don't see in iwlegacy.
>
> Can you explain why it is named passive_no_rx instead passive_no_tx ?

Well, it is basically - passive channel with no rx :-) This means we can't tx.

>> I think the best way to solve this would be to do such a thing in
>> iwlegacy as well, but until then and for stable maybe we should
>> introduce another HW flag to restore the previous mac80211 behaviour?
>
> I'm not sure if I like to add passive_no_rx to iwlegacy. Stopping queues
> and waiting for beacon looks sticky, what happen if beacon will not be
> received?
>
> Perhaps I will just remove IEEE80211_HW_REPORTS_TX_ACK_STATUS from 4965,
> it's simpler workaround ?