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wl18xx hostapd configuration for maximum performance

wifijacob
Expert 1245 points
Hi! What HT capabilites do wl18xx have? Interesting fields available in hostapd configuration: * LDPC coding capability (LDPC) * Channel widths (HT40+, HT40-) * HT-greenfield (GF) * Short GI for 20 MHz (SHORT-GI-20) * Short GI for 40 MHz (SHORT-GI-40) * Tx STBC (TX-STBC) * Rx STBC (RX-STBC1, RX-STBC12) Which of these are supported by the chip?
  • 0
    TI__Guru* 85400 points
    Hi Jacob,

    I believe below are supported. But let me check and get back.

    [HT40-]
    [HT40+]
    [GF]
    [SHORT-GI-20]
    [SHORT-GI-40]
    [DSSS_CCK-40]

    Regards,
    Gigi Joseph.
  • 0 in reply to Joseph Gigi
    TI__Guru* 85400 points
    Hi Jacob,

    After aligning with the experts, I am confirming the above entries... But, please note that for 2.4 in AP mode, we do not support SISO40

    Regards,
    Gigi Joseph.
  • 0 in reply to wifijacob
    Expert 1245 points

    Hi again

    It seems like HT40+/- are not supported for all channels. Can you give me a list of channels and capabilities for each channel?

    I've found /sys/kernel/debug/ieee80211/phy0/ht40allow_map, which contains:

    cat /sys/kernel/debug/ieee80211/phy0/ht40allow_map
    2412 HT40 +
    2417 HT40 +
    2422 HT40 +
    2427 HT40 +
    2432 HT40 -+
    2437 HT40 -+
    2442 HT40 -+
    2447 HT40 -+
    2452 HT40 -+
    2457 HT40 -
    2462 HT40 -
    2467 HT40 -
    2472 HT40 -
    2484 HT40
    5040 Disabled
    5060 Disabled
    5080 Disabled
    5170 Disabled
    5180 HT40 +
    5190 HT40 +
    5200 HT40 -+
    5210 HT40 -+
    5220 HT40 -+
    5230 HT40 -
    5240 HT40 -+
    5260 HT40 -+
    5280 HT40 -+
    5300 HT40 -+
    5320 HT40 -
    5500 HT40 +
    5520 HT40 -+
    5540 HT40 -+
    5560 HT40 -+
    5580 HT40 -+
    5600 HT40 -+
    5620 HT40 -+
    5640 HT40 -+
    5660 HT40 -+
    5680 HT40 -+
    5700 HT40 -
    5745 HT40 +
    5765 HT40 -+
    5785 HT40 -+
    5805 HT40 -+
    5825 HT40 -

    Although for instance for channel 44 (=5220), only HT40+ is supported. for channel 40 (=5200), only HT40- is supported.

    Please clarify this.

    Thanks, Jacob

  • 0 in reply to wifijacob
    Expert 1245 points
    Joseph, any updates on this?

    Jacob
  • 0 in reply to wifijacob
    TI__Guru* 85400 points
    Hi Jacob,

    This is expected. Lower channels cannot have HT40 - and higher channels cannot have HT40 + (otherwise it will go out of the channel limits)

    Regards,
    Gigi Joseph.
  • 0 in reply to Joseph Gigi
    Expert 1245 points

    Hi Joseph!
    My question was where I could find a list of channels and capabilities on each channel. Do you know where I can find such a list?

    Jacob

  • 0 in reply to wifijacob
    TI__Guru* 85400 points
    Hi Jacob,

    You can take a look at: http://en.wikipedia.org/wiki/List_of_WLAN_channels

    Regards,
    Gigi Joseph.
  • 0 in reply to Joseph Gigi
    Expert 1245 points
    Hi
    So in short, it's dependent on channel + regulations? Is there any way on a running system I can get this list (/sys/kernel/debug/ieee80211/phy0/ht40allow_map doesn't seem to take regulations into account)?

    I still cannot figure out my findings above ("Although for instance for channel 44 (=5220), only HT40+ is supported. for channel 40 (=5200), only HT40- is supported."), using /sys/kernel/debug/ieee80211/phy0/ht40allow_map and Wikipedia "List of WLAN channels".

    Jacob
  • 0 in reply to wifijacob
    TI__Guru* 85400 points
    Hi Jacob,

    I don't understood your question.
    The ht40allow_map should take the regdb into account.
    If the country code is set as US (for example), then both 5220 & 5200 should have HT+- . In your list also, you are mentioning that.

    Regards,
    Gigi Joseph.
  • 0 in reply to Joseph Gigi
    Expert 1245 points
    Hi
    So why does hostapd fail to start if I have HT40- listed as capabilites when starting an access point on channel 44 (5220), even though it has '-+' in the ht40allow_map? Same with HT40+ and 40 (5200).

    Jacob
  • 0 in reply to wifijacob
    TI__Guru* 85400 points
    Hi Jacob,

    Can you share the hostapd -dd logs and your hostapd.conf, please?
    Also which module are you using?

    Regards,
    Gigi Joseph.
  • 0 in reply to Joseph Gigi
    Expert 1245 points
    output from hostapd -dd:

    Configuration file: /od11-hostapd-wlan0-work-mcs.conf
    wlcore: PHY firmware version: Rev 8.2.0.0.224
    wlcore: firmware booted (Rev 8.9.0.0.31)
    IPv6: ADDRCONF(NETDEV_UP): wlan0-work: link is not ready
    wlan0-work: interface state UNINITIALIZED->HT_SCAN
    HT40 channel pair (44, -1) not allowed
    Interface initialization failed
    wlan0-work: interface state HT_SCAN->DISABLED
    hostapd_free_hapd_data: Interfwlcore: down
    ace wlan0-work wasn't started

    hostapd.conf:
    driver=nl80211
    logger_syslog=127
    logger_syslog_level=2
    logger_stdout=127
    logger_stdout_level=2
    hw_mode=a
    channel=44
    interface=wlan0-work
    ctrl_interface=/var/run/hostapd
    disassoc_low_ack=0
    preamble=1
    wmm_enabled=1
    ignore_broadcast_ssid=0
    auth_algs=1
    ssid=AP DUT
    okc=0
    ieee80211n=1
    ht_capab=[SHORT-GI-20][GF][HT40-]
    disable_pmksa_caching=1
    start_disabled=0
    wpa_passphrase=xxxxxxxx
    wpa=2
    wpa_pairwise=CCMP
    dtim_period=1


    What module are you referring to?

    Thanks, Jacob
  • 0 in reply to wifijacob
    TI__Guru* 85400 points
    Hi Jacob,

    This seems to be a restriction as per the 11.n standard "Annex J". From the hostapd conf file:

    # Note: There are limits on which channels can be used with HT40- and
    # HT40+. Following table shows the channels that may be available for
    # HT40- and HT40+ use per IEEE 802.11n Annex J:
    # freq HT40- HT40+
    # 2.4 GHz 5-13 1-7 (1-9 in Europe/Japan)
    # 5 GHz 40,48,56,64 36,44,52,60

    Regards,
    Gigi Joseph.
  • 0 in reply to Joseph Gigi
    Expert 1245 points

    Hi!
    Thanks, that list seems to be correct.

         Jacob

  • 0 in reply to Joseph Gigi
    Expert 1245 points
    Hi Gigi!
    I'm unable to get HT40- or HT40+ working on 2,4GHz, on every channel that I've tried. This is the current regulatory domain for these frequencies:
    (2402 - 2482 @ 40), (20)
    (2474 - 2494 @ 20), (20), NO-OFDM

    hostapd output:
    Configuration file: /tmp/hostapd-wlan0.conf
    wlcore: down
    Driver does not support configured HT capability [HT40*]
    wlan0: Unable to setup interface.
    hostapd_free_hapd_data: Interface wlan0 wasn't started
    wlcore: down

    This particular output is from channel 1 and [HT40+].
  • 0 in reply to wifijacob
    TI__Guru* 85400 points
    Hi Jacob,

    Channels 5-13 should have HT40- and 1-7 should have HT40+
    Can you share the hostapd.conf file that you have? Are you using a custom regulatory bin file?

    Regards,
    Gigi Joseph
  • 0 in reply to Joseph Gigi
    Expert 1245 points

    Hi
    hostapd config file:

    driver=nl80211
logger_syslog=127
logger_syslog_level=2
logger_stdout=127
logger_stdout_level=2
hw_mode=g
dtim_period=1
channel=1
interface=wlan0-config
ctrl_interface=/var/run/hostapd
disassoc_low_ack=0
preamble=1
wmm_enabled=1
ignore_broadcast_ssid=0
auth_algs=1
ssid=COOL SSID
okc=0
ieee80211n=1
ht_capab=[HT40+]
disable_pmksa_caching=1
start_disabled=0
wpa=0

    hostapd output:

    Configuration file: /tmp/od11-hostapd-wlan0-config.conf
nl80211: Supports Probe Response offload in AP mode
nl80211: Uswlcore: down
ing driver-based off-channel TX
nl80211: Use separate P2P group interface (driver advertised support)
nl80211: Enable multi-channel concurrent (driver advertised support)
nl80211: interface wlan0-config in phy phy0
nl80211: Set mode ifindex 6 iftype 3 (AP)
nl80211: Setup AP(wlan0-config) - device_ap_sme=0 use_monitor=0
nl80211: Subscribe to mgmt frames with AP handle 0x1d89270
nl80211: Register frame type=0xb0 nl_handle=0x1d89270
nl80211: Register frame match - hexdump(len=0): [NULL]
nl80211: Register frame type=0x0 nl_handle=0x1d89270
nl80211: Register frame match - hexdump(len=0): [NULL]
nl80211: Register frame type=0x20 nl_handle=0x1d89270
nl80211: Register frame match - hexdump(len=0): [NULL]
nl80211: Register frame type=0xa0 nl_handle=0x1d89270
nl80211: Register frame match - hexdump(len=0): [NULL]
nl80211: Register frame type=0xc0 nl_handle=0x1d89270
nl80211: Register frame match - hexdump(len=0): [NULL]
nl80211: Register frame type=0xd0 nl_handle=0x1d89270
nl80211: Register frame match - hexdump(len=0): [NULL]
nl80211: Register frame type=0x40 nl_handle=0x1d89270
nl80211: Register frame match - hexdump(len=0): [NULL]
nl80211: Add own interface ifindex 6
phy: phy0
BSS count 1, BSSID mask 00:00:00:00:00:00 (0 bits)
nl80211: Regulatory information - country=00
nl80211: 2402-2482 @ 40 MHz
nl80211: 2402-2482 @ 20 mBm
nl80211: 2474-2494 @ 20 MHz
nl80211: 2474-2494 @ 20 mBm
nl80211: 5170-5835 @ 160 MHz
nl80211: 5170-5835 @ 20 mBm
nl80211: 57240-63720 @ 2160 MHz
nl80211: 57240-63720 @ 0 mBm
nl80211: Added 802.11b mode based on 802.11g information
Allowed channel: mode=1 chan=1 freq=2412 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=2 freq=2417 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=3 freq=2422 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=4 freq=2427 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=5 freq=2432 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=6 freq=2437 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=7 freq=2442 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=8 freq=2447 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=9 freq=2452 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=10 freq=2457 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=11 freq=2462 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=12 freq=2467 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=13 freq=2472 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=14 freq=2484 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=36 freq=5180 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=38 freq=5190 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=40 freq=5200 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=42 freq=5210 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=44 freq=5220 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=46 freq=5230 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=48 freq=5240 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=52 freq=5260 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=56 freq=5280 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=60 freq=5300 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=64 freq=5320 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=100 freq=5500 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=104 freq=5520 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=108 freq=5540 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=112 freq=5560 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=116 freq=5580 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=120 freq=5600 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=124 freq=5620 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=128 freq=5640 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=132 freq=5660 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=136 freq=5680 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=140 freq=5700 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=149 freq=5745 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=153 freq=5765 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=157 freq=5785 MHz max_tx_power=20 dBm
Allowed channel: mode=2 chan=161 freq=5805 MHz mwlcore: down
ax_tx_power=20 dBm
Allowed channel: mode=2 chan=165 freq=5825 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=1 freq=2412 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=2 freq=2417 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=3 freq=2422 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=4 freq=2427 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=5 freq=2432 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=6 freq=2437 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=7 freq=2442 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=8 freq=2447 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=9 freq=2452 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=10 freq=2457 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=11 freq=2462 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=12 freq=2467 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=13 freq=2472 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=14 freq=2484 MHz max_tx_power=20 dBm
Driver does not support configured HT capability [HT40*]
wlan0-config: Unable to setup interface.
hostapd_interface_deinit_free(0x1d880b8)
hostapd_interface_deinit_free: num_bss=1 conf->num_bss=1
hostapd_interface_deinit(0x1d880b8)
hostapd_bss_deinit: deinit bss wlan0-config
wlan0-config: Flushing old station entries
nl80211: flush -> DEL_STATION wlan0-config (all)
wlan0-config: Deauthenticate all stations
nl80211: send_mlme - noack=0 freq=0 no_cck=0 offchanok=0 wait_time=0 fc=0xc0 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 88 33 14 1a 90 e1 88 33 14 1a 90 e1 00 00 03 00
nl80211: Frame command failed: ret=-22 (Invalid argument) (freq=0 wait=0)
wpa_driver_nl80211_set_key: ifindex=6 (wlan0-config) alg=0 addr=(nil) key_idx=0 set_tx=0 seq_len=0 key_len=0
wpa_driver_nl80211_set_key: ifindex=6 (wlan0-config) alg=0 addr=(nil) key_idx=1 set_tx=0 seq_len=0 key_len=0
wpa_driver_nl80211_set_key: ifindex=6 (wlan0-config) alg=0 addr=(nil) key_idx=2 set_tx=0 seq_len=0 key_len=0
wpa_driver_nl80211_set_key: ifindex=6 (wlan0-config) alg=0 addr=(nil) key_idx=3 set_tx=0 seq_len=0 key_len=0
hostapd_cleanup(hapd=0x1d885f8 (wlan0-config))
hostapd_free_hapd_data: Interface wlan0-config wasn't started
hostapd_interface_deinit_free: driver=0x6960c drv_priv=0x1d88e90 -> hapd_deinit
nl80211: Remove monitor interface: refcount=0
nl80211: Remove beacon (ifindex=6)
netlink: Operstate: linkmode=0, operstate=6
nl80211: Set mode ifindex 6 iftype 2 (STATION)
nl80211: Teardown AP(wlan0-config) - device_ap_sme=0 use_monitor=0
nl80211: Unsubscribe mgmt frames handle 0x89501af9 (AP teardown)
hostapd_interface_free(0x1d880b8)
hostapd_interface_free: free hapd 0x1d885f8
hostapd_cleanup_iface(0x1d880b8)
hostapd_cleanup_iface_partial(0x1d880b8)
hostapd_cleanup_iface: free iface=0x1d880b8

    regulatory information (printed by hostapd above):

    nl80211: 2402-2482 @ 40 MHz
nl80211: 2474-2494 @ 20 MHz
  • 0 in reply to wifijacob
    TI__Guru* 85400 points
    Hi Jacob,

    Have you modified any of the driver code (perhaps ".ht.mode")?
    I am using the prebuilt R8.5 drivers + the hostapd.conf that you provided and don't see this error.

    Regards,
    Gigi Joseph.
  • 0 in reply to Joseph Gigi
    Expert 1245 points
    Hi!
    ht.mode is set to 0.

    Thanks, Jacob
  • 0 in reply to wifijacob
    TI__Guru* 85400 points
    Hi Jacob,

    You would need to set it to "HT_MODE_WIDE" = 1 to use SISO40.
    mode = 0, means use MIMO, fall back to SISO20.

    Regards,
    Gigi Joseph.