netdev - Re: mac80211 using different tx queue for frames with same TID and RA

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Date:	Mon, 30 Aug 2010 16:34:09 +0200
From:	Helmut Schaa <helmut.schaa@...glemail.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	linux-wireless@...r.kernel.org,
	Krishna Kumar <krkumar2@...ibm.com>, netdev@...r.kernel.org
Subject: Re: mac80211 using different tx queue for frames with same TID and RA

Am Monday 30 August 2010 schrieb Johannes Berg:
> On Mon, 2010-08-30 at 16:01 +0200, Helmut Schaa wrote:
> 
> > while debugging an issue in rt2x00 I've discovered that in some cases frames
> > with the same TID and RA end up in different tx queues (which causes problems
> > in rt2x00 when using aggregation).
> > 
> > Is this behavior expected and we need to handle that case in rt2x00 or is it
> > more likely a bug? At least I thought the select_queue implementation in
> > mac80211 was meant to always pick the same tx queue for skbs with the same
> > priority and hence it shouldn't happen that frames with the same TID are
> > queued into different tx queues.
> 
> Indeed, that seems like a bug. I don't see how this can happen though,
> since the code _appears_ to not use the sk_tx_queue_mapping when an
> ndo_select_queue method is present.

Hmm, this issue seems to only happen when the wifi interface (AP mode)
is part of a bridge and the frame is tx'ed through the bridge.

Helmut
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