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FS#395 - mac80211.sh: detect_mac80211 should check available channels #5426

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openwrt-bot opened this issue Jan 17, 2017 · 0 comments
Open

FS#395 - mac80211.sh: detect_mac80211 should check available channels #5426

openwrt-bot opened this issue Jan 17, 2017 · 0 comments
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@openwrt-bot openwrt-bot commented Jan 17, 2017

rmilecki:

This problem was reported by few Netgear R8000 users and I managed to reproduce it. It's related to the following code:
vht_cap=$(iw phy "$dev" info | grep -c 'VHT Capabilities')
cap_5ghz=$(iw phy "$dev" info | grep -c "Band 2")
[ "$vht_cap" -gt 0 -a "$cap_5ghz" -gt 0 ] && {
mode_band="a";
channel="36"
htmode="VHT80"
}

===========Default htmode===========
The first problem is that even if hardware supports VHT80 it may be not available for every/any current channel. If channel 36 doesn't support VHT80, for better user experience, it shouldn't be set in /etc/config/wireless by default. Example:root@lede:/# iw phy phy2 info
Wiphy phy2
max # scan SSIDs: 10
max scan IEs length: 2048 bytes
max # sched scan SSIDs: 0
max # match sets: 0
max # scan plans: 1
max scan plan interval: -1
max scan plan iterations: 0
Retry short limit: 7
Retry long limit: 4
Coverage class: 0 (up to 0m)
Device supports roaming.
Available Antennas: TX 0 RX 0
Supported interface modes:
* IBSS
* managed
* AP
* P2P-client
* P2P-GO
* P2P-device
Band 2:
Capabilities: 0x1062
HT20/HT40
Static SM Power Save
RX HT20 SGI
RX HT40 SGI
No RX STBC
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 16 usec (0x07)
HT TX/RX MCS rate indexes supported: 0-23
VHT Capabilities (0x0c025820):
Max MPDU length: 3895
Supported Channel Width: neither 160 nor 80+80
short GI (80 MHz)
SU Beamformer
SU Beamformee
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
Frequencies:
* 5170 MHz [34] (disabled)
* 5180 MHz [36] (20.0 dBm)
* 5190 MHz [38] (disabled)
* 5200 MHz [40] (20.0 dBm)
* 5210 MHz [42] (disabled)
* 5220 MHz [44] (20.0 dBm)
* 5230 MHz [46] (disabled)
* 5240 MHz [48] (20.0 dBm)
* 5260 MHz [52] (20.0 dBm) (no IR, radar detection)
* 5280 MHz [56] (20.0 dBm) (no IR, radar detection)
* 5300 MHz [60] (20.0 dBm) (no IR, radar detection)
* 5320 MHz [64] (20.0 dBm) (no IR, radar detection)
* 5500 MHz [100] (20.0 dBm) (no IR, radar detection)
* 5520 MHz [104] (20.0 dBm) (no IR, radar detection)
* 5540 MHz [108] (20.0 dBm) (no IR, radar detection)
* 5560 MHz [112] (20.0 dBm) (no IR, radar detection)
* 5580 MHz [116] (20.0 dBm) (no IR, radar detection)
* 5600 MHz [120] (20.0 dBm) (no IR, radar detection)
* 5620 MHz [124] (20.0 dBm) (no IR, radar detection)
* 5640 MHz [128] (20.0 dBm) (no IR, radar detection)
* 5660 MHz [132] (20.0 dBm) (no IR, radar detection)
* 5680 MHz [136] (20.0 dBm) (no IR, radar detection)
* 5700 MHz [140] (20.0 dBm) (no IR, radar detection)
* 5720 MHz [144] (disabled)
* 5745 MHz [149] (disabled)
* 5765 MHz [153] (disabled)
* 5785 MHz [157] (disabled)
* 5805 MHz [161] (disabled)
* 5825 MHz [165] (disabled)
valid interface combinations:
* #{ managed } <= 1, #{ P2P-device } <= 1, #{ P2P-client, P2P-GO } <= 1,
total <= 3, #channels <= 1
* #{ managed } <= 1, #{ AP } <= 1, #{ P2P-client } <= 1, #{ P2P-device } <= 1,
total <= 4, #channels <= 1
* #{ AP } <= 4,
total <= 4, #channels <= 1, STA/AP BI must match
root@lede:/# iw phy phy2 channels
Band 2:
* 5170 MHz [34] (disabled)
* 5180 MHz [36]
Maximum TX power: 20.0 dBm
Channel widths: 20MHz HT40+
* 5190 MHz [38] (disabled)
* 5200 MHz [40]
Maximum TX power: 20.0 dBm
Channel widths: 20MHz HT40-
* 5210 MHz [42] (disabled)
* 5220 MHz [44]
Maximum TX power: 20.0 dBm
Channel widths: 20MHz HT40+
* 5230 MHz [46] (disabled)
* 5240 MHz [48]
Maximum TX power: 20.0 dBm
Channel widths: 20MHz HT40-
* 5260 MHz [52]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40+
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5280 MHz [56]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40-
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5300 MHz [60]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40+
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5320 MHz [64]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40-
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5500 MHz [100]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40+
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5520 MHz [104]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40-
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5540 MHz [108]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40+
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5560 MHz [112]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40-
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5580 MHz [116]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40+
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5600 MHz [120]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40-
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5620 MHz [124]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40+
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5640 MHz [128]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40-
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5660 MHz [132]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40+
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5680 MHz [136]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40-
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5700 MHz [140]
Maximum TX power: 20.0 dBm
No IR
Radar detection
Channel widths: 20MHz
DFS state: usable (for 163 sec)
DFS CAC time: 0 ms
* 5720 MHz [144] (disabled)
* 5745 MHz [149] (disabled)
* 5765 MHz [153] (disabled)
* 5785 MHz [157] (disabled)
* 5805 MHz [161] (disabled)
* 5825 MHz [165] (disabled)

as you can see, VHT80 isn't support on any currently available channel due to regulatory limits.
===========Default channel===========
Picking channel 36 blindly is a bad idea as it may not be available. In case of phy0/radio0 on Netgear R8000 only available channels are 149+ due to hardware/board design (see [[https://patchwork.kernel.org/patch/9516629/|ARM: BCM5301X: Set 5 GHz wireless frequency limits on Netgear R8000]]).
root@lede:/# iw phy phy0 info
Wiphy phy0
max # scan SSIDs: 10
max scan IEs length: 2048 bytes
max # sched scan SSIDs: 0
max # match sets: 0
max # scan plans: 1
max scan plan interval: -1
max scan plan iterations: 0
Retry short limit: 7
Retry long limit: 4
Coverage class: 0 (up to 0m)
Device supports roaming.
Available Antennas: TX 0 RX 0
Supported interface modes:
* IBSS
* managed
* AP
* P2P-client
* P2P-GO
* P2P-device
Band 2:
Capabilities: 0x1062
HT20/HT40
Static SM Power Save
RX HT20 SGI
RX HT40 SGI
No RX STBC
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 16 usec (0x07)
HT TX/RX MCS rate indexes supported: 0-23
VHT Capabilities (0x0c025820):
Max MPDU length: 3895
Supported Channel Width: neither 160 nor 80+80
short GI (80 MHz)
SU Beamformer
SU Beamformee
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
Frequencies:
* 5170 MHz [34] (disabled)
* 5180 MHz [36] (disabled)
* 5190 MHz [38] (disabled)
* 5200 MHz [40] (disabled)
* 5210 MHz [42] (disabled)
* 5220 MHz [44] (disabled)
* 5230 MHz [46] (disabled)
* 5240 MHz [48] (disabled)
* 5260 MHz [52] (disabled)
* 5280 MHz [56] (disabled)
* 5300 MHz [60] (disabled)
* 5320 MHz [64] (disabled)
* 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)
* 5720 MHz [144] (disabled)
* 5745 MHz [149] (20.0 dBm)
* 5765 MHz [153] (20.0 dBm)
* 5785 MHz [157] (20.0 dBm)
* 5805 MHz [161] (20.0 dBm)
* 5825 MHz [165] (20.0 dBm)
valid interface combinations:
* #{ managed } <= 1, #{ P2P-device } <= 1, #{ P2P-client, P2P-GO } <= 1,
total <= 3, #channels <= 1
* #{ managed } <= 1, #{ AP } <= 1, #{ P2P-client } <= 1, #{ P2P-device } <= 1,
total <= 4, #channels <= 1
* #{ AP } <= 4,
total <= 4, #channels <= 1, STA/AP BI must match
root@lede:/# iw phy phy0 channels
Band 2:
* 5170 MHz [34] (disabled)
* 5180 MHz [36] (disabled)
* 5190 MHz [38] (disabled)
* 5200 MHz [40] (disabled)
* 5210 MHz [42] (disabled)
* 5220 MHz [44] (disabled)
* 5230 MHz [46] (disabled)
* 5240 MHz [48] (disabled)
* 5260 MHz [52] (disabled)
* 5280 MHz [56] (disabled)
* 5300 MHz [60] (disabled)
* 5320 MHz [64] (disabled)
* 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)
* 5720 MHz [144] (disabled)
* 5745 MHz [149]
Maximum TX power: 20.0 dBm
Channel widths: 20MHz HT40+ VHT80
* 5765 MHz [153]
Maximum TX power: 20.0 dBm
Channel widths: 20MHz HT40- VHT80
* 5785 MHz [157]
Maximum TX power: 20.0 dBm
Channel widths: 20MHz HT40+ VHT80
* 5805 MHz [161]
Maximum TX power: 20.0 dBm
Channel widths: 20MHz HT40- VHT80
* 5825 MHz [165]
Maximum TX power: 20.0 dBm
Channel widths: 20MHz

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