From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-ew0-f165.google.com ([209.85.219.165]:64524 "EHLO mail-ew0-f165.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759193AbZDBRaO (ORCPT ); Thu, 2 Apr 2009 13:30:14 -0400 Received: by ewy9 with SMTP id 9so651557ewy.37 for ; Thu, 02 Apr 2009 10:30:11 -0700 (PDT) From: Ivo van Doorn To: Johannes Berg Subject: Re: [PATCH] mac80211: Always send a null data frame if TIM bit is set. Date: Thu, 2 Apr 2009 19:30:04 +0200 Cc: Kalle Valo , Vivek Natarajan , linux-wireless@vger.kernel.org References: <20090302145030.GA4660@myhost.users.atheros.com> <87ocvfiovd.fsf@litku.valot.fi> <1238666571.4141.14.camel@johannes.local> In-Reply-To: <1238666571.4141.14.camel@johannes.local> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Message-Id: <200904021930.06031.IvDoorn@gmail.com> (sfid-20090402_193020_823764_2137E442) Sender: linux-wireless-owner@vger.kernel.org List-ID: On Thursday 02 April 2009, Johannes Berg wrote: > On Thu, 2009-04-02 at 08:52 +0300, Kalle Valo wrote: > > > I really would like to have some frame ack callback to mac80211, even > > not all drivers support that. Otherwise we cannot reliably go to power > > save because the AP might not receive our nullfunc frame. I have to > > think about this and I'll try to propose something later on. > > I suppose we could well assume that we do get TX status for those > devices that do support power save -- which devices would that affect? rt2500usb and rt73usb don't provide a valid TX status but do support power save at he moment. I have to add that I'm in contact with somebody who is looking into supporting Ack-based TX status reporting in mac80211 which could cure this problem. I have directed him to the linux-wireless list so he will probably soon send his ideas to the list. In any case, for now we can assume rt2500usb and rt73usb to be a problem. Ivo