From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Young Subject: Re: Regarding A-MPDU status field Date: Tue, 22 Nov 2011 11:06:05 -0600 Message-ID: <20111122170605.GJ20624@pixotech.com> References: <21E1C3B49A18BA428D58607D5EEA5398BB2E90@nasanexd02b.na.qualcomm.com> <1320223343.3950.29.camel@jlt3.sipsolutions.net> <21E1C3B49A18BA428D58607D5EEA5398BB67FA@nasanexd02b.na.qualcomm.com> <1320847366.3845.72.camel@jlt3.sipsolutions.net> <21E1C3B49A18BA428D58607D5EEA5398BBBD18@nasanexd02b.na.qualcomm.com> <1321259214.4472.16.camel@jlt3.sipsolutions.net> <21E1C3B49A18BA428D58607D5EEA5398BC8C00@nasanexd02b.na.qualcomm.com> <1321867620.3999.7.camel@jlt3.sipsolutions.net> <21E1C3B49A18BA428D58607D5EEA5398BC971A@nasanexd02b.na.qualcomm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <21E1C3B49A18BA428D58607D5EEA5398BC971A-RqevaKtL5OWBP98+muIrrKRtKmQZhJ7pQQ4Iyu8u01E@public.gmane.org> Sender: radiotap-owner-sUITvd46vNxg9hUCZPvPmw@public.gmane.org To: "radiotap-sUITvd46vNxg9hUCZPvPmw@public.gmane.org" List-Id: radiotap@radiotap.org On Tue, Nov 22, 2011 at 02:27:17PM +0000, Rao, Krishna wrote: > Hi, > > >>> 4) (Debatable) Delimiter CRC value itself. I don't know if there is > >>> any hardware which returns the actual value to software. Anyway, > >>> having it as part of the field will allow platforms which do possess > >>> the capability, to provide this information. It may come in handy for > >>> some users. > >> > >> That seems a bit of a stretch, but it's only 8 bits so I wouldn't mind > >> adding it. > > > >I think that in the interest of, as you say, "reconstruct[ing] what > >happened on the air as precisely as possible", which is a goal that I > >strongly agree with, it is important to pass that information up. > > > >On the other hand, if the information is only hypothetically > >available.... > Since there is always a possibility that some existing or future > hardware might have this capability, having this subfield in the > specification might prove useful down the line. Inviting comments on > this. Still thinking along the lines of "reconstruct ... as precisely", let me throw this idea out there: the A-MPDU field can help us to reconstruct a whole A-MPDU by telling us the range of byte indices where the subframe may have begun in the aggregate, [start0, start1]. If the driver doesn't know, then the interval is [0, length of A-MPDU]. If the driver knows precisely, then [x, x], otherwise [x, y] where x != y. Dave -- David Young dyoung-e+AXbWqSrlAAvxtiuMwx3w@public.gmane.org Urbana, IL (217) 721-9981