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RE: [RFC v2 13/12] cfg80211/mac80211: allow management TX to not wait for ACK

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On Fri, 2011-10-28 at 00:48 -0700, Arend Van Spriel wrote:
> > Sent: donderdag 27 oktober 2011 21:33
> > From: Johannes Berg <johannes.berg@xxxxxxxxx>
> > 
> > For probe responses it can be useful to not wait for ACK
> > to save airtime, so allow userspace to request not waiting
> > with a new nl80211 flag.
> > 
> > Since mac80211 needs to be updated for the new function
> > prototype anyway implement it right away -- it's just a
> > few lines of code.

> I would expect this to affect the duration field in the
> 802.11 header to indicate the shorter use of the medium.
> Going through your patch I am not sure this is done.

Hmmm. You're right, but that's something we already need to fix in many
cases -- as the duration field is overwritten by most hardware these
days, we haven't always maintained it very well.

Your driver seems to be the exception to this -- maybe you can look into
fixing up the duration calculations? Also for 11n which isn't taken into
account at all today.

johannes

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