[BUG] QWLE900V5-18 - cannot achievie 3 spatial streams link

Fri Dec 6 12:25:14 EST 2013

For reference, STBC is not spatials treams, it's "space time block coding."

IIRC, the QCA hardware only does 1 stream STBC on two-stream or
three-stream devices.

-adrian

On 6 December 2013 08:33, Tomasz Tajmajer <tt at elnovel.com> wrote:
> Hi,
>
> Recently, I've been making quite a lot of tests with two QWLE900V5-18 cards.
> I had some issues with the drivers (e.g. regarding the regulatory domain),
> but I've managed to fix them on my own. However, there is one issue that I
> cannot deal with.
> I'm trying to get the highest throughput possible using 3x3 MIMO. The
> problem is that the wifi card does not set higher rates than 2x433.3Mbps
> (MCS 9, VHT-NSS 2). The specification says that it should be possible to
> have 3 spatial streams.
> First, I thought it is a problem with some options of hostapd, but hostapd
> even does not allows me to set the [RX-STBC-12] or [RX-STBC-123] options.
> Only [RX-STBC-1] may be set in the configuration (what in fact, does not
> disallows the 2x433.3Mbps link, which is another issue).
> Driver info shows that the driver should support 3 spatial streams.
> I am not sure where is the problem, is it some bug in hostapd, which forces
> the card to use 2 spatial streams only or is it the driver, which does not
> enable 3 streams when it is possible. The physical connectivity (antennas
> etc.) is not the problem AFAIK.
>
>
> The ath10k driver used for AP is a bit hacked to always report the US regd
> code
>
> Some dumps for you:
>
> iw version 3.13
>
> iw phy phy0 info
> Wiphy phy0
> max # scan SSIDs: 16
> max scan IEs length: 199 bytes
> Coverage class: 0 (up to 0m)
> Device supports AP-side u-APSD.
> Supported Ciphers:
> * WEP40 (00-0f-ac:1)
> * WEP104 (00-0f-ac:5)
> * TKIP (00-0f-ac:2)
> * CCMP (00-0f-ac:4)
> * CMAC (00-0f-ac:6)
> Available Antennas: TX 0 RX 0
> Supported interface modes:
>  * IBSS
>  * managed
>  * AP
>  * AP/VLAN
>  * monitor
>  * P2P-client
>  * P2P-GO
> Band 2:
> Capabilities: 0x19e3
> RX LDPC
> HT20/HT40
> Static SM Power Save
> RX HT20 SGI
> RX HT40 SGI
> TX STBC
> RX STBC 1-stream
> Max AMSDU length: 7935 bytes
> DSSS/CCK HT40
> Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
> Minimum RX AMPDU time spacing: 8 usec (0x06)
> HT TX/RX MCS rate indexes supported: 0-23
> VHT Capabilities (0x338001b2):
> Max MPDU length: 11454
> Supported Channel Width: neither 160 nor 80+80
> RX LDPC
> short GI (80 MHz)
> TX STBC
> RX antenna pattern consistency
> VHT RX MCS set:
> 1 streams: MCS 0-9
> 2 streams: MCS 0-9
> 3 streams: MCS 0-9
> 4 streams: not supported
> 5 streams: not supported
> 6 streams: not supported
> 7 streams: not supported
> 8 streams: not supported
> VHT RX highest supported: 0 Mbps
> VHT TX MCS set:
> 1 streams: MCS 0-9
> 2 streams: MCS 0-9
> 3 streams: MCS 0-9
> 4 streams: not supported
> 5 streams: not supported
> 6 streams: not supported
> 7 streams: not supported
> 8 streams: not supported
> VHT TX highest supported: 0 Mbps
> Bitrates (non-HT):
> * 6.0 Mbps
> * 9.0 Mbps
> * 12.0 Mbps
> * 18.0 Mbps
> * 24.0 Mbps
> * 36.0 Mbps
> * 48.0 Mbps
> * 54.0 Mbps
> Frequencies:
> * 5180 MHz [36] (20.0 dBm)
> * 5200 MHz [40] (20.0 dBm) (no IR)
> * 5220 MHz [44] (20.0 dBm)
> * 5240 MHz [48] (20.0 dBm) (no IR)
> * 5260 MHz [52] (20.0 dBm) (no IR, radar detection)
>   DFS state: usable (for 110543 sec)
> * 5280 MHz [56] (20.0 dBm) (no IR, radar detection)
>   DFS state: usable (for 110543 sec)
> * 5300 MHz [60] (20.0 dBm) (no IR, radar detection)
>   DFS state: usable (for 110543 sec)
> * 5320 MHz [64] (20.0 dBm) (no IR, radar detection)
>   DFS state: usable (for 110543 sec)
> * 5500 MHz [100] (disabled)
> * 5520 MHz [104] (disabled)
> * 5540 MHz [108] (disabled)
> * 5560 MHz [112] (disabled)
> * 5580 MHz [116] (disabled)
> * 5600 MHz [120] (disabled)
> * 5620 MHz [124] (disabled)
> * 5640 MHz [128] (disabled)
> * 5660 MHz [132] (disabled)
> * 5680 MHz [136] (disabled)
> * 5700 MHz [140] (disabled)
> * 5745 MHz [149] (disabled)
> * 5765 MHz [153] (disabled)
> * 5785 MHz [157] (disabled)
> * 5805 MHz [161] (disabled)
> * 5825 MHz [165] (disabled)
> Supported commands:
>  * new_interface
>  * set_interface
>  * new_key
>  * start_ap
>  * new_station
>  * new_mpath
>  * set_mesh_config
>  * set_bss
>  * authenticate
>  * associate
>  * deauthenticate
>  * disassociate
>  * join_ibss
>  * join_mesh
>  * remain_on_channel
>  * set_tx_bitrate_mask
>  * frame
>  * frame_wait_cancel
>  * set_wiphy_netns
>  * set_channel
>  * set_wds_peer
>  * probe_client
>  * set_noack_map
>  * register_beacons
>  * start_p2p_device
>  * set_mcast_rate
>  * connect
>  * disconnect
> Supported TX frame types:
>  * IBSS: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0
> 0xd0 0xe0 0xf0
>  * managed: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0
> 0xd0 0xe0 0xf0
>  * AP: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0
> 0xe0 0xf0
>  * AP/VLAN: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0
> 0xd0 0xe0 0xf0
>  * mesh point: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0
> 0xc0 0xd0 0xe0 0xf0
>  * P2P-client: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0
> 0xc0 0xd0 0xe0 0xf0
>  * P2P-GO: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0
> 0xd0 0xe0 0xf0
>  * P2P-device: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0
> 0xc0 0xd0 0xe0 0xf0
> Supported RX frame types:
>  * IBSS: 0x40 0xb0 0xc0 0xd0
>  * managed: 0x40 0xd0
>  * AP: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
>  * AP/VLAN: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
>  * mesh point: 0xb0 0xc0 0xd0
>  * P2P-client: 0x40 0xd0
>  * P2P-GO: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
>  * P2P-device: 0x40 0xd0
> software interface modes (can always be added):
>  * AP/VLAN
>  * monitor
> valid interface combinations:
>  * #{ managed, P2P-client } <= 8, #{ P2P-GO } <= 3, #{ AP } <= 7,
>    total <= 8, #channels <= 1, STA/AP BI must match
> HT Capability overrides:
>  * MCS: ff ff ff ff ff ff ff ff ff ff
>  * maximum A-MSDU length
>  * supported channel width
>  * short GI for 40 MHz
>  * max A-MPDU length exponent
>  * min MPDU start spacing
> Device supports TX status socket option.
> Device supports HT-IBSS.
> Device supports scan flush.
>
>
> hostapd --version
> hostapd v2.1-devel
>
>
> dmesg (AP)
> [ 4808.976236 <tel:%5B%204808.976236>] Loading modules backported from Linux
> version next-20131129-0-gae5be52
> [ 4808.976243 <tel:%5B%204808.976243>] Backport generated by backports.git
> backports-20131129-0-g8a36e16
> [ 4808.982669 <tel:%5B%204808.982669>] cfg80211: Calling CRDA to update
> world regulatory domain
> [ 4810.814727] ath10k_pci 0000:06:00.0: BAR 0: assigned [mem
> 0xf7200000-0xf73fffff 64bit]
> [ 4810.819406] ath10k: MSI-X didn't succeed (1), trying MSI
> [ 4810.819480] ath10k_pci 0000:06:00.0: irq 49 for MSI/MSI-X
> [ 4810.819513] ath10k: MSI interrupt handling
> [ 4810.861220] ath10k: Hardware name qca988x hw2.0 version 0x4100016c
> [ 4811.749751] ath10k: UART prints disabled
> [ 4811.756642] ath10k: firmware 10.1.389 booted
> [ 4811.766282] ath10k: htt target version 2.1
> [ 4811.767324] ath: EEPROM regdomain: 0x60
> [ 4811.767328] ath: EEPROM indicates we should expect a direct regpair map
> [ 4811.767333] ath: Country alpha2 being used: h7
> [ 4811.767336] ath: Regpair used: 0x60
> [ 4811.782155] IPv6: ADDRCONF(NETDEV_UP): wlan2: link is not ready
>
>
> dmesg (STA)
> [110825.598266] Loading modules backported from Linux version
> next-20131129-0-gae5be52
> [110825.598271] Backport generated by backports.git
> backports-20131129-0-g8a36e16
> [110825.603361] cfg80211: Calling CRDA to update world regulatory domain
> [110827.515449] ath10k_pci 0000:0c:00.0: BAR 0: assigned [mem
> 0xece00000-0xecffffff 64bit]
> [110827.515883] ath10k: MSI-X didn't succeed (1), trying MSI
> [110827.516037] ath10k_pci 0000:0c:00.0: irq 47 for MSI/MSI-X
> [110827.516114] ath10k: MSI interrupt handling
> [110827.561579] ath10k: Hardware name qca988x hw2.0 version 0x4100016c
> [110828.778794] ath10k: UART prints disabled
> [110828.785405] ath10k: firmware 999.999.0.636 booted
> [110828.795890] ath10k: htt target version 2.1
> [110828.797409] ath: EEPROM regdomain: 0x0
> [110828.797413] ath: EEPROM indicates default country code should be used
> [110828.797417] ath: doing EEPROM country->regdmn map search
> [110828.797422] ath: country maps to regdmn code: 0x3a
> [110828.797426] ath: Country alpha2 being
>
> BR,
>
> --
> Tomasz Tajmajer,
> Embedded Systems Engineer,
> Elnovel Sp. z o.o. [Ltd.] (elnovel.com)
>
>
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