On Fri, Mar 04, 2016 at 10:07:56AM +0200, Luca Coelho wrote: > On Fri, 2016-02-26 at 22:12 +0200, Jouni Malinen wrote: > > This is an optimization and as such, it is acceptable for some of the > > drivers not to support the mechanism. If not supported, the wildcard > > BSSID will be used and more responses may be received. > > Receiving more responses than what we asked for is always possible, > because we don't filter out other things we may receive at the same > time. It's like requesting for a specific SSID, it just means that the > SSID will be used in the probe requests, but it doesn't guarantee that > other results will not be returned.
Sure. This "more responses" is referring to not being able to get the benefit from saved airtime; not on what we might add into the cfg80211 BSS table. We don't even have an explicit mechanism for reporting results from a single scan iteration. > > diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h > > @@ -322,7 +322,9 @@ > > * @NL80211_CMD_GET_SCAN: get scan results > > * @NL80211_CMD_TRIGGER_SCAN: trigger a new scan with the given parameters > > * %NL80211_ATTR_TX_NO_CCK_RATE is used to decide whether to send the > > - * probe requests at CCK rate or not. > > + * probe requests at CCK rate or not. %NL80211_ATTR_MAC can be used to > > + * specify a BSSID to scan for; if not included, the wildcard BSSID will > > + * be used. > > Maybe you could be explicit here about the possibility of receiving > more results than requested? Which "receiving" are you referring to here? I don't see much point in documenting the airtime optimization here and as far as receiving results through nl80211 is concerned, the only option for it today is to use NL80211_CMD_GET_SCAN and that returns the current contents of the BSS table rather than returns from any specific scan, so I'm not sure what exactly you would like to add here. I was going to note that this is similar to how NL80211_ATTR_SCAN_SSIDS is documented, but actually, that one is not mentioned at all with NL80211_CMD_TRIGGER_SCAN currently.. Nor is the details of what NL80211_CMD_GET_SCAN returns. -- Jouni Malinen PGP id EFC895FA
