Ok, I've started digging into this a bit more. I need to get 11n adhoc working so I can get 11n ahdemo working, so we can actually do 11n TDMA at some point in the near future.
There's a whole lot of missing stuff: * ieee80211_add_neighbor() and ieee80211_init_neighbor() don't know about HT at all; they don't populate the HT IEs or 11n rates; * when scanning and choosing a channel to create a BSS on, there are two things: + if it doesn't find an IBSS, it creates one + if it doesn't find an IBSS, it joins that IBSS initially, via whatever is in the scan cache, using the scan cache channel results. Now, I fixed the primary so it does correctly populate the HTINFO/HTCAP IEs; so now the IBSS 11n beaconing does indeed include the TX/RX MCS configuration necessary to do HT/MCS. But the second is the problem - namely, it looks in the scan cache, selects the matched entry (that used a legacy channel, as scanning is done using legacy channels!) then it just calls ieee80211_sta_join() using that. So it always creates a non-HT channel configuration and associates as a non-HT node. Now, if I change adhoc_pick_bss() to adjust the channel to be a HT channel before it goes off and calls ieee80211_sta_join(), it will successfully setup the channel to be an 11n channel and it'll do MCS rates with an 11n peer fine. (traffic throughput sucks and panics though; so it's not all smooth sailing here.) But that raises a big problem: If the first node that a new IBSS device sees is non-11n, will it just assume the BSS is legacy, or will it magically promote itself to 11n/ht20 or 11n/ht40 and continue along merrily? It'd be nice to figure out what the behaviour there should be. Anyway. I'm making a little progress. I'll see if I can figure out why I'm getting panics and crappy throughput when doing traffic tests - I bet the adhoc RX and TX data path doesn't have some 11n related fixes in there and it's messing things up. Adrian _______________________________________________ freebsd-wireless@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-wireless To unsubscribe, send any mail to "freebsd-wireless-unsubscr...@freebsd.org"
