[Bug 198680] [ath] Specifying "mode 11ng" breaks client connectivity with ath(4)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198680

--- Comment #4 from Adrian Chadd <adrian at freebsd.org> ---
ok, compile in IEEE80211_DEBUG, then do this with:

wlandebug +scan +assoc

I bet what we'll see is:

Mar 20 23:57:16 lucy-11i386 kernel: - c4:3d:c7:6c:5f:14 c4:3d:c7:6c:5f:14    6!
  16  11M!  ess   no  "Sridhar 2.4G (Netgear2)"

.. the SSID is what I'm trying to associate to here.

I bet the scan code is mis-comparing the channels. (ie, the 6!)

What I see is:

Mar 20 23:57:12 lucy-11i386 kernel: wlan1: scan_task: chan   1b ->   6b
[active, dwell min 20ms max 200ms]
Mar 20 23:57:12 lucy-11i386 kernel: wlan1: scan_curchan: calling; maxdwell=200
Mar 20 23:57:12 lucy-11i386 kernel: wlan1: scan_task: waiting
Mar 20 23:57:12 lucy-11i386 kernel: [b2:ca:b5:aa:b2:00] new beacon on chan 6
(bss chan 6) "" rssi 16
Mar 20 23:57:12 lucy-11i386 kernel: [b2:ca:b5:aa:b2:00] caps 0x411 bintval 100
erp 0x104 country [US  1-11,20]
Mar 20 23:57:12 lucy-11i386 kernel: [b6:ca:b5:aa:b2:00] new beacon on chan 6
(bss chan 6) "xfinitywifi" rssi 15
Mar 20 23:57:12 lucy-11i386 kernel: [b6:ca:b5:aa:b2:00] caps 0x401 bintval 100
erp 0x104 country [US  1-11,20]
Mar 20 23:57:12 lucy-11i386 kernel: [c4:3d:c7:6c:5f:14] new beacon on chan 6
(bss chan 6) "Sridhar 2.4G (Netgear2)" rssi 15
Mar 20 23:57:12 lucy-11i386 kernel: [c4:3d:c7:6c:5f:14] caps 0x401 bintval 100
erp 0x100
Mar 20 23:57:12 lucy-11i386 kernel: wlan1: ieee80211_swscan_add_scan: chan   6b
min dwell met (2401585927 > 2401585885)
Mar 20 23:57:12 lucy-11i386 kernel: wlan1: scan_mindwell: called
Mar 20 23:57:12 lucy-11i386 kernel: wlan1: scan_task: loop start; scandone=0
Mar 20 23:57:12 lucy-11i386 kernel: wlan1: scan_task: chan   6b ->  11b
[active, dwell min 20ms max 200ms]

.. ok, so now let's try without the mode:

Mar 20 23:59:09 lucy-11i386 kernel: + c4:3d:c7:6c:5f:14 c4:3d:c7:6c:5f:14    6 
  14  54M   ess   no  "Sridhar 2.4G (Netgear2)"

.. and it associated.

Mar 20 23:59:05 lucy-11i386 kernel: wlan1: scan_task: chan   1g ->   6g
[active, dwell min 20ms max 200ms]
Mar 20 23:59:05 lucy-11i386 kernel: wlan1: scan_curchan: calling; maxdwell=200
Mar 20 23:59:05 lucy-11i386 kernel: wlan1: scan_task: waiting
Mar 20 23:59:05 lucy-11i386 kernel: [c4:3d:c7:6c:5f:14] new probe_resp on chan
6 (bss chan 6) "Sridhar 2.4G (Netgear2)" rssi 14
Mar 20 23:59:05 lucy-11i386 kernel: [c4:3d:c7:6c:5f:14] caps 0x401 bintval 100
erp 0x100
Mar 20 23:59:05 lucy-11i386 kernel: [00:1d:d3:45:f3:f0] new beacon on chan 6
(bss chan 6) "HOME-F3F2" rssi 7
Mar 20 23:59:05 lucy-11i386 kernel: [00:1d:d3:45:f3:f0] caps 0x411 bintval 100
erp 0x104 country [US  1-11,20]
Mar 20 23:59:05 lucy-11i386 kernel: [d8:97:ba:cf:f5:b8] new beacon on chan 6
(bss chan 6) "HOME-72F7-2.4" rssi 20
Mar 20 23:59:05 lucy-11i386 kernel: [d8:97:ba:cf:f5:b8] caps 0x431 bintval 100
erp 0x100 country [US  1-11,30]
Mar 20 23:59:05 lucy-11i386 kernel: [92:87:7c:3b:b5:90] new beacon on chan 6
(bss chan 6) "" rssi 5
Mar 20 23:59:05 lucy-11i386 kernel: [92:87:7c:3b:b5:90] caps 0x411 bintval 100
erp 0x104 country [US  1-11,20]
Mar 20 23:59:05 lucy-11i386 kernel: wlan1: ieee80211_swscan_add_scan: chan   6g
min dwell met (2401699610 > 2401699579)
Mar 20 23:59:05 lucy-11i386 kernel: wlan1: scan_mindwell: called
Mar 20 23:59:05 lucy-11i386 kernel: wlan1: scan_task: loop start; scandone=0
Mar 20 23:59:05 lucy-11i386 kernel: wlan1: scan_task: chan   6g ->  11g
[active, dwell min 20ms max 200ms]

.. note that it's scanning as 6g now, not 6b.

Mar 21 00:00:40 lucy-11i386 kernel: + c4:3d:c7:6c:5f:14 c4:3d:c7:6c:5f:14    6 
  15  11M   ess   no  "Sridhar 2.4G (Netgear2)"

with:

Mar 21 00:00:36 lucy-11i386 kernel: wlan1: scan_task: chan   1b ->   6b
[active, dwell min 20ms max 200ms]
Mar 21 00:00:36 lucy-11i386 kernel: wlan1: scan_curchan: calling; maxdwell=200
Mar 21 00:00:36 lucy-11i386 kernel: wlan1: scan_task: waiting
Mar 21 00:00:36 lucy-11i386 kernel: [c4:3d:c7:6c:5f:14] new beacon on chan 6
(bss chan 6) "Sridhar 2.4G (Netgear2)" rssi 15
Mar 21 00:00:36 lucy-11i386 kernel: [c4:3d:c7:6c:5f:14] caps 0x401 bintval 100
erp 0x100
Mar 21 00:00:36 lucy-11i386 kernel: wlan1: ieee80211_swscan_add_scan: chan   6b
min dwell met (2401789910 > 2401789866)
Mar 21 00:00:36 lucy-11i386 kernel: wlan1: scan_mindwell: called
Mar 21 00:00:36 lucy-11i386 kernel: wlan1: scan_task: loop start; scandone=0
Mar 21 00:00:36 lucy-11i386 kernel: wlan1: scan_task: chan   6b ->  11b
[active, dwell min 20ms max 200ms]

.. and that's odd. It's 6b, but it doesn't work this time.

I'll have to go digging into the scan code to see how it's comparing and what
flags it's using. Ugh.

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