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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1283179307.3691.73.camel@jlt3.sipsolutions.net>
Date:	Mon, 30 Aug 2010 16:41:47 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Helmut Schaa <helmut.schaa@...glemail.com>
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

On Mon, 2010-08-30 at 16:34 +0200, Helmut Schaa wrote:
> 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.

Ok, I guess in that case it may actually have a socket TX queue mapping
already? Seems bogus to use it though.

johannes

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html