Re: [PATCH] mac80211_hwsim: Report rate info in tx status

[Johannes Berg <johannes@sipsolutions.net>]

On Wed, 2012-03-28 at 11:28 +0200, Timo Lindhorst wrote:
> Hey,
> 
> > +     if (!ack)
> > +             for (i = 0; i < IEEE80211_TX_MAX_RATES; i++)
> > +                     tx_count[i] = txi->control.rates[i].count;
> > +
> >       ieee80211_tx_info_clear_status(txi);
> >       if (!(txi->flags & IEEE80211_TX_CTL_NO_ACK) && ack)
> >               txi->flags |= IEEE80211_TX_STAT_ACK;
> > +
> > +     if (ack) {
> > +             txi->status.rates[0].count = 1;
> > +             txi->status.rates[1].idx = -1;
> > +     } else {
> > +             for (i = 0; i < IEEE80211_TX_MAX_RATES; i++)
> > +                     txi->control.rates[i].count = tx_count[i];
> > +     }
> > +
> >       ieee80211_tx_status_irqsafe(hw, skb);
> >  }
> 
> I know: backing up the count values, clearing the status, and restoring the
> values if necessary is kind of ugly. Would it be better to partly clear the 
> status manually instead of using ieee80211_tx_info_clear_status() ?

Yeah just noticed the ieee80211_tx_info_clear_status() in there too...

OTOH, what are you using this for? It seems almost like we should always
just set
	txi->status.rates[0].count = 1;

since we never attempted multiple transmits? I'm not really sure though,
it's a corner case ... I could also imagine this being populated by
userspace (wmediumd) but I guess that isn't there now ...

johannes