DFS start_dfs_cac() failed, -1

[Todd Lewis]

 DFS support is disabled in the kernel.

cat /var/log/dmesg | grep dfs
[    3.256615] ath10k_pci 0000:03:00.0: kconfig debug 0 debugfs 1
tracing 0 dfs 0 testmode 0


I'll try recompiling the kernel.

On Sat, Jul 1, 2017 at 8:38 AM, Lasse Jensen <and0806 at yahoo.dk> wrote:
> Enable DFS support in the kernel
>
> It turns out that DFS must be enabled in kernel and by default the option is
> hidden from kernel configuration dialogs. To check if DFS is enabled look
> through kernel message output:
> ap ~ # dmesg ... [ 2.850086] ath10k_pci 0000:04:00.0: debug 1 debugfs 1
> tracing 0 dfs 0 testmode 0 ...
>
> The output indicates that DFS is disabled (“dfs 0”). To enable DFS you must
> enable following options:
>
>     “Configure standard kernel features (expert users)” under “General
> Setup”
>     “cfg80211 certification onus” under “Networking support > Wireless”
>     “Atheros DFS support for certified platforms” under “Device Drivers >
> Network device support > Wireless LAN > Atheros Wireless Cards”
>
> Re-compile the kernel and verify if the kernel output indicates DFS support.
> Then, re-enable DFS and choose a higher channel of your liking.
> Den 29. jun. 2017, fra 14.28, Todd Lewis <todd at grizzlystar.com> skrev:
>>
>> I'm setting up a access point on a linux router.
>> I am unable to start hostapd. I get the error DFS start_dfs_cac() failed,
>> -1
>>
>> I'm using a
>> Compex WLE600VX  Qualcom QCA9882
>>
>>
>>
>> /usr/local/bin/hostapd -dd /etc/hostapd/hostapd.conf
>>
>> ACS: Adjusting VHT center frequency
>> wlp4s0: ACS-COMPLETED freq=5580 channel=116
>> Completing interface initialization
>> Mode: IEEE 802.11a  Channel: 116  Frequency: 5580 MHz
>> DFS 4 channels required radar detection
>> DFS all channels available, (SKIP CAC): no
>> DFS 0 chans unavailable - choose other channel: no
>> wlp4s0: interface state ACS->DFS
>> DFS start CAC on 5580 MHz
>> wlp4s0: DFS-CAC-START freq=5580 chan=116 sec_chan=0, width=1,
>> seg0=122, seg1=0, cac_time=60s
>> Can't set freq params
>> DFS start_dfs_cac() failed, -1
>> Interface initialization failed
>> wlp4s0: interface state DFS->DISABLED
>> wlp4s0: AP-DISABLED
>> ACS: Possibly channel configuration is invalid, please report this
>> along with your config file.
>> ACS: Failed to start
>> wlp4s0: AP-DISABLED
>> wlp4s0: Deauthenticate all stations
>> nl80211: send_mlme - da= ff:ff:ff:ff:ff:ff noack=0 freq=0 no_cck=0
>> offchanok=0 wait_time=0 fc=0xc0 (WLAN_FC_STYPE_DEAUTH) nlmode=3
>> nl80211: send_mlme -> send_frame
>> nl80211: send_frame - Use bss->freq=0
>> nl80211: send_frame -> send_frame_cmd
>> nl80211: CMD_FRAME freq=0 wait=0 no_cck=0 no_ack=0 offchanok=0
>> CMD_FRAME - hexdump(len=26): c0 00 00 00 ff ff ff ff ff ff 04 f0 21 1f
>> 0f e5 04 f0 21 1f 0f e5 00 00 03 00
>> nl80211: Frame command failed: ret=-22 (Invalid argument) (freq=0 wait=0)
>> hostapd_free_hapd_data: Interface wlp4s0 wasn't started
>> hostapd_deinit_driver: driver=0x493c40 drv_priv=0x2555df0 -> hapd_deinit
>> nl80211: deinit ifname=wlp4s0 disabled_11b_rates=0
>> nl80211: Remove monitor interface: refcount=0
>> nl80211: Remove beacon (ifindex=8)
>> netlink: Operstate: ifindex=8 linkmode=0 (kernel-control), operstate=6
>> (IF_OPER_UP)
>> nl80211: Set mode ifindex 8 iftype 2 (STATION)
>> nl80211: Teardown AP(wlp4s0) - device_ap_sme=0 use_monitor=0
>> nl80211: Unsubscribe mgmt frames handle 0x888888888addb739 (AP teardown)
>> hostapd_deinit_driver:bss[0]->drv_priv=0x2555df0
>> hostapd_cleanup_iface_partial(0x25535c0)
>> Interface wlp4s0 disabled
>> wlp4s0: interface state DISABLED->DISABLED
>> hostapd_interface_deinit_free(0x25535c0)
>> hostapd_interface_deinit_free: num_bss=1 conf->num_bss=1
>> hostapd_interface_deinit(0x25535c0)
>> wlp4s0: interface state DISABLED->DISABLED
>> hostapd_bss_deinit: deinit bss wlp4s0
>> wlp4s0: AP-DISABLED
>> hostapd_cleanup(hapd=0x2554cc0 (wlp4s0))
>> hostapd_free_hapd_data: Interface wlp4s0 wasn't started
>> hostapd_interface_deinit_free: driver=0x493c40 drv_priv=(nil) ->
>> hapd_deinit
>> hostapd_interface_free(0x25535c0)
>> hostapd_interface_free: free hapd 0x2554cc0
>> hostapd_cleanup_iface(0x25535c0)
>> hostapd_cleanup_iface_partial(0x25535c0)
>> hostapd_cleanup_iface: free iface=0x25535c0
>>
>>
>> The configuration file
>> /etc/hostapd/hostapd.conf
>>
>> ctrl_interface=/var/run/hostapd
>> ctrl_interface_group=wheel
>> bridge=br0
>> interface=wlp4s0
>> driver=nl80211
>> ssid=test-5g
>> hw_mode=a
>> max_num_sta=128
>> auth_algs=1
>> disassoc_low_ack=1
>> ieee80211h=1
>> ieee80211d=1
>> country_code=US
>> channel=0
>> ieee80211ac=1
>> vht_oper_chwidth=1
>>
>> vht_capab=[HT40+][LDPC][SHORT-GI-20][SHORT-GI-40][TX-STBC][RX-STBC1][DSSS_CCK-40]
>> vht_oper_centr_freq_seg0_idx=42
>> wpa=3
>> wpa_key_mgmt=WPA-PSK
>> wpa_passphrase=darkcrystal1
>> wpa_pairwise=CCMP
>>
>> --
>> Todd Lewis
>>
>> ________________________________
>>
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>> Hostap at lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/hostap



-- 
Todd Lewis

Grizzly Star

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