From: Johannes Berg <johannes@sipsolutions.net>
To: Michal Kazior <michal.kazior@tieto.com>
Cc: linux-wireless@vger.kernel.org
Subject: Re: [PATCH] mac80211: support reporting A-MSDU subframes individually
Date: Tue, 01 Oct 2013 12:22:32 +0200 [thread overview]
Message-ID: <1380622952.14430.9.camel@jlt4.sipsolutions.net> (raw)
In-Reply-To: <1379943278-1014-1-git-send-email-michal.kazior@tieto.com>
On Mon, 2013-09-23 at 15:34 +0200, Michal Kazior wrote:
> Some devices may not be able to report A-MSDUs in
> single buffers. Drivers for such devices were
> forced to re-assemble A-MSDUs which would then
> be eventually disassembled by mac80211. This could
> lead to CPU cache thrashing and poor performance.
>
> Since A-MSDU has a single sequence number all
> subframes share it. This was in conflict with
> retransmission/duplication recovery
> (IEEE802.11-2012: 9.3.2.10).
>
> Patch introduces a new flag that is meant to be
> set for all individually reported A-MSDU subframes
> except the last one. This ensures the
> last_seq_ctrl is updated after the last subframe
> is processed. If an A-MSDU is actually a duplicate
> transmission all reported subframes will be
> properly discarded.
Applied.
johannes
prev parent reply other threads:[~2013-10-01 10:22 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-23 13:34 [PATCH] mac80211: support reporting A-MSDU subframes individually Michal Kazior
2013-10-01 10:22 ` Johannes Berg [this message]
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