Hi,
> > > > Then there is a problem for rt2x00. Since the mactime isn't known.
> > > > rt2400pci is the _only_ device which has a RX_END_TIME field in the
> > > > RX descriptor.
> > >
> > > one workaround could be to simply use the current TSF at the time in the
> > > tasklet or interrupt handler (to be more close to the actual rx time).
> > > this
> > > should be sufficient to catch most cases where an IBSS merge is necessary
> > > -
> > > usually the beacon's TSF will be much higher than the local TSF.
> >
> > Should the driver to this, or should mac80211 handle that?
>
> The driver should if it has access to some the mactime of the received
> packet otherwise yes -- I think mac80211 can handle this using the
> supplied get_tsf().
>
> > Personally I think it is something for the mac80211 layer since the driver
> > will
> > give what it can, and can be sure that it is what mac80211 expects instead
> > of
> > drivers interpreting what mac80211 might want as replacement.
> > If mac80211 needs the TSF value when no mac time is given, it could just
> > use the get_tsf() callback function to the driver to get the substitute.
> > When the
> > get_tsf() callback is not provided, then mac80211 can complain about missing
> > information.
>
> Agreed, how about something like this modified to Bruno's patch:
>
> + if (rx_status->flag & RX_FLAG_TSFT)
> + mactime = rx_status->mactime;
> + else {
> + if (!local->ops->get_tsf) {
> + WARN_ON(1);
> + mactime = -1LLU;
> + if (net_ratelimit())
> + printk(KERN_WARNING "%s: cannot determine if "
> + "IBSS merge is required", dev->name);
> + }
> + else {
> + if (net_ratelimit())
> + printk("Could not get detailed timestamp
> of beacon "
> + during reception, using the
> driver's TSF timer for mactime\n")
> + mactime = local->ops->get_tsf(local_to_hw(local));
> + }
> + }
>
> We could just not support IBSS for driver's without a get_tsf(). Thoughts?
I am not sure if we should print error warning messages when the mactime is
not provided. But other then that I agree with the above change, as it would
allow rt2x00 to use the IBSS syncing. :)
Ivo
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