Re: [PATCH v6] mac80211: minstrel_ht: add basic support for VHT rates <= 3SS@80MHz

[Jouni Malinen <j@w1.fi>]

On Fri, Nov 14, 2014 at 06:18:32PM +0100, Karl Beldan wrote:
> Yes, only with iw and nothing fancy, I also have had it running on some 
> boards for some weeks as is and with rfc version for more than a year at
> work (minstrel not the whole tree).
> I guess I can take the tip of wireless-testing but can you give your
> HEAD though ?

It looks like pretty much any snapshot between master-2014-11-04 and now
is affected.. Anyway, the current master snapshot in my tests was
0e204e2422876c18034ca960c4fccf727a02a5c1.

> > For example, with nfc_p2p_go_neg test case:
> 
> Have you reproduced it with other testcases (maybe more regular so that
> I can get my hands on it faster) ?
> Is it also happening when VHT support is not advertized by upper layers
> ?

This seems to be specific to exact timing of frames since the same issue
does not show up in non-NFC P2P test cases. So no, this does not show up
with anything else than the nfc_p2p_* test cases (well, at least not in
my desktop+kvm setup; YMMV with other CPU speeds that could potentially
affect timing):
nfc_p2p_go_neg
nfc_p2p_go_neg_reverse
nfc_p2p_ip_addr_assignment
nfc_p2p_static_handover_tagdev_client
nfc_p2p_static_handover_tagdev_client_group_iface
nfc_p2p_static_handover_tagdev_go

I'd assume the key here is in P2P with NFC trigger having the fastest
possible connection process due to all the optimizations in channel
selection on WPS (which is those EAPOL Data frames that hit these rate
selection issues immediately after association).

That said, if you use the tests/hwsim scripts from
git://w1.fi/hostap.git there should be no difference on running some of
these cases vs. something more regular..

If you have not used these test scripts previously, you can find more
information about the setup here:
http://w1.fi/cgit/hostap/plain/tests/hwsim/README
http://w1.fi/cgit/hostap/plain/tests/hwsim/vm/README

-- 
Jouni Malinen                                            PGP id EFC895FA