linux-kernel - Re: [ 104/173] rt2x00: Dont let mac80211 send a BAR when an AMPDU subframe fails

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Date:	Mon, 7 Jan 2013 17:54:59 +0100
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Andreas Hartmann <andihartmann@...19freenet.de>
Cc:	Ben Hutchings <ben@...adent.org.uk>,
	Johannes Berg <johannes@...solutions.net>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Helmut Schaa <helmut.schaa@...glemail.com>,
	"John W. Linville" <linville@...driver.com>
Subject: Re: [ 104/173] rt2x00: Dont let mac80211 send a BAR when an AMPDU
 subframe fails

On Mon, Jan 07, 2013 at 04:04:01PM +0100, Andreas Hartmann wrote:
> Ben Hutchings wrote:
> > On Mon, 2013-01-07 at 09:10 +0100, Stanislaw Gruszka wrote:
> >> On Mon, Jan 07, 2013 at 09:05:32AM +0100, Stanislaw Gruszka wrote:
> >>>> To be clear, I have all of these in the queue:
> >>>>
> >>>> be03d4a45c09 rt2x00: Don't let mac80211 send a BAR when an AMPDU subframe fails
> >>>> 5b632fe85ec8 mac80211: introduce IEEE80211_HW_TEARDOWN_AGGR_ON_BAR_FAIL
> >>>> ab9d6e4ffe19 Revert: "rt2x00: Don't let mac80211 send a BAR when an AMPDU subframe fails"
> >>>>
> >>>> and I'm intending to drop/defer them all.
> >>>
> >>> Patch 3 is a revert of patch 1 (questioned patch). Please apply all 3 patches,
> >>> or only patch 2.
> >>
> >> No, actually all 3 patches have to be applied. Because last one, except
> >> revert, include flag IEEE80211_HW_TEARDOWN_AGGR_ON_BAR_FAIL setting in rt2x00
> >> driver, which make patch 2 work.
> > 
> > Andreas said that that after ab9d6e4ffe19 there was still a regression.

That's not true. There will be no regression after ab9d6e4ffe20. The
only thing is that solution is not perfect. But perfect solution require
lot of changes i.e. is not -stable appropriate (and does not exist currently).

> > But maybe he was confused.  I know I'm confused.
> :-))
> 
> No, the thing is:
> rt2800pci misses an appropriate handling of aggregation (which meets the
> requirements of mac80211).
> 
> Both workarounds, mine and the new workaround from Stanislaw (which is
> nothing more than a restricted version of my initial workaround), work

Your workaround broke STA mode on some environment.

Stanislaw
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