Re: tx_status reporting of RTS/CTS frames

[Mattias Nissler <mattias.nissler@gmx.de>]

On Wed, 2007-12-12 at 18:15 +0100, Johannes Berg wrote:
> Hi,
> 
> > rt2x00 devices can't generate rts/cts frames themselves, but rely on the
> > driver to generate them. Also, the hardware reports tx status back for
> > those frames. Now the question is whether these frames should be
> > reported back to mac80211 using ieee80211_tx_status[_irqsafe]. AFAIK,
> > this has some subtle effects, e.g. they won't show up on monitor
> > interfaces if we don't report them.
> 
> They never show up on monitor interfaces for all other hardware because
> there the hardware handles them. How is it that rt2x00 cannot handle
> rts? It has to at least know that an RTS was sent and to send the frame
> only after the CTS, and that needs to be a MAC function and cannot be
> implemented in host software.

rt2x00 devices have some flags in the TX descriptor that basically tell
the device to send a burst of frames, optionally requesting to wait for
an ack (i.e. CTS in the case of an RTS frame) for any of them.

> So, I'd think they shouldn't be reported at all.

Ok, I'll prepare a patch for rt2x00.

Mattias