On Sat, Nov 10, 2018 at 12:44 PM Brice Dubost <bd@xxxxxxxxxxxxx> wrote: > > Hello, > > I am looking into making an AP that can use DFS frequencies (for VoIP > to avoid spectrum congestion) with an USB adapter on a raspberry pi > > So far we have tried to use an atheros based dongle: > Linksys Max-Stream AC600 Dual-Band MU-MIMO USB Adapter (WUSB6100M) > Unfortunately the ath10k-usb driver is still very experimental and we > were not able to get the dongle to work > > We also looked to another dongle > ID 148f:5572 Ralink Technology, Corp. RT5572 Wireless Adapter > iw list says it supports the frequencies with radar detection. > The startup of hostapd says the same > > Allowed channel: mode=2 chan=60 freq=5300 MHz max_tx_power=23 dBm (DFS > state = usable) > > > Unfortunately when I start it in AP mode on the channel 60, I get a > ressource busy answer when the nl driver send the radar scan message. > It happens in the function static int nl80211_start_radar_detection of > src/drivers/driver_nl80211.c > I tried both with the stock version of raspbian and a fresh pull from Git > > These are the logs I am getting. > =============== > DFS support is enabled > Completing interface initialization > Mode: IEEE 802.11a Channel: 60 Frequency: 5300 MHz > DFS 1 channels required radar detection > DFS all channels available, (SKIP CAC): no > DFS 0 chans unavailable - choose other channel: no > wlan1: interface state COUNTRY_UPDATE->DFS > DFS start CAC on 5300 MHz > wlan1: DFS-CAC-START freq=5300 chan=60 sec_chan=0, width=0, seg0=0, > seg1=0, cac_time=60s > nl80211: Start radar detection (CAC) 5300 MHz (ht_enabled=1, > vht_enabled=0, bandwidth=20 MHz, cf1=5300 MHz, cf2=0 MHz) > * freq=5300 > * vht_enabled=0 > * ht_enabled=1 > * sec_channel_offset=0 > * channel_type=1 > nl80211: Failed to start radar detection: -16 (Device or resource busy) > DFS start_dfs_cac() failed, -1 > Interface initialization failed > wlan1: interface state DFS->DISABLED > wlan1: AP-DISABLED > wlan1: Unable to setup interface. > hostapd_interface_deinit_free(0x13fd8d0) > hostapd_interface_deinit_free: num_bss=1 conf->num_bss=1 > hostapd_interface_deinit(0x13fd8d0) > wlan1: interface state DISABLED->DISABLED > hostapd_bss_deinit: deinit bss wlan1 > wlan1: Deauthenticate all stations > ================== > > I am ready to help doing further debugging or tests, but I don't know > where to start. > > Do you have suggestions on making DFS work with non ath chipsets ? Maybe the country is not set correctly. As far as non ath chipsets go, Mediatek also has several USB devices. > > > Thank you > > -- > Brice Dubost > > _______________________________________________ > Hostap mailing list > Hostap@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/hostap _______________________________________________ Hostap mailing list Hostap@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/hostap
