On Fri, 2019-02-08 at 12:08 -0800, James Prestwood wrote: > Hi, > > I am trying to create a VHT capable radio with mac80211_hwsim, to be > used with hostapd. I have tried a few configs in > tests/hwsim/test_ap_vht.py but all that I have tried result in > hostapd > complaining about the channel e.g. > > Channel 36 (primary) not allowed for AP mode, flags: 0x853 NO-IR > wln2: IEEE 802.11 Configured channel (36) not found from the channel > list of current mode (2) IEEE 802.11a > wln2: IEEE 802.11 Hardware does not support configured channel > > I have tried a few channels, none of which work. This makes me think > it > has to do with how I am creating the radio with mac80211_hwsim. I'm > just creating an essentially 'default' radio (no special attributes). > I've looked through the hwsim driver code and it appears that all > radios created set some VHT capability bits (the for loop iterating > over NUM_NL80211_BANDS) so any hwsim radio should support VHT > (right?). > None of the HWSIM_ATTR's seem to point anything related to VHT > either. > > Here is (one of) the config I've tried: > > ssid=testSSID > country_code=DE > hw_mode=a > channel=36 > ieee80211n=1 > ieee80211ac=1 > vht_oper_chwidth=0 > vht_oper_centr_freq_seg0_idx=0 > supported_rates=60 120 240 360 480 540 > require_vht=1 > > Thanks, > James I still have not resolved this, though I have a bit more info that hopefully someone can make use of. (Thanks to Johannes) I believe this issue has to do with the regulatory domain. In my VM, if I run "iw reg get" I see that my country is set to '00'. This country code seems to restrict the VHT channels. I tried changing this with "iw reg set US", but this does not actually result in the country changing (also a common-ish problem I have found online). I have noticed a few things after looking closer at the logs: Kernel Boot: [ 0.393391] cfg80211: Loading compiled-in X.509 certificates for regulatory database [ 0.394742] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7' [ 0.395648] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2 [ 0.396819] cfg80211: failed to load regulatory.db I also see hostapd trying to change the country code (since I set it in the config): Previous country code 00, new country code US Continue interface setup after channel list update But soon after: Channel list update timeout - try to continue anyway So it appears to be either cfg80211 or mac80211_hwsim that is restricting the channels hostapd is allowed to use. I see in mac80211_hwsim there is an attribute HWSIM_ATTR_REG_HINT_ALPHA2. I have tried using that, setting to "US", but this does not result in the VM's country code changing (either from boot or after iw reg set US). I have tried also running the hostapd hwsim tests directly following: https://w1.fi/cgit/hostap/plain/tests/hwsim/vm/example-vm-setup.txt But after ./vm-run.sh all I get is wpa_supplicant usage prints (as if it was being started with invalid arguments or something) and: Failed to connect to wpa_supplicant global interface: /tmp/wpas- wlan0 error: No such file or directory Should it be this hard to use VHT in hostapd? Thanks, James _______________________________________________ Hostap mailing list Hostap@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/hostap
