On Friday 06 April 2012 17:11:29 Johannes Berg wrote: > On Fri, 2012-04-06 at 13:22 +0200, Christian Lamparter wrote: > > > > Is that chipset limitation we could add only new STA interface when > > > main_vif is also STA? > > <http://wireless.kernel.org/en/users/Drivers/carl9170#Multiple_Interfaces> > > no, it's not. But you'll have to go through several hoops to extend > > the driver to switch the "main" interface while the device is up and > > running. > > So the driver has a concept of the order in which interfaces are added? > That's something I never considered when writing the interface type > combinations support. Actually, it's more of a master/slave situation. The MAC only has one security engine "mode" which can be either AP/IBSS/WDS. [So, this setting will be shared with all virtual interfaces] Next, the MAC only has one TSF counter, [beacon/tbtt timer, etc...] which is also shared between the virtual interfaces [note: the TSF sync depends on the mode as well, you see if the main interface is a station/ibss then the TSF is automatically updated [by the hardware in fact] and there is nothing a slave interface [e.g.: AP] can do!]. And then there is of course the shared ERP, basic rates, slot time, multicast, QOS/WME, ... stuff. Regards, Christian -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
