[FS#644] WiFi fails with AP & Meshpoint interfaces

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Terry Gillett (tgillett) 

Attached to Project - LEDE Project
Summary - WiFi fails with AP & Meshpoint interfaces
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - 
Since this commit: 

    r3307-649e766"mac80211: update to wireless-testing 2017-01-31" dated 2 Fed 2017

wifi does not correctly support concurrent AP and Meshpoint interfaces. 

Immediately prior to the commit  (r3306-91fce81), the problem is not in evidence.
    

In failure, the 'iw  dev' command shows details of both interfaces, but he "channel" line is missing from the  command output for the Meshpoint interface and the Meshpoint interface is not actually working. 

The firmware operates correctly with two AP interfaces defined, or with two Meshpoint interfaces defined.

Also the "top" command shows a high level of CPU utilisation, typically 50% for [kworker/u2:2]


 - Device problem occurs on: 

    Various. Tested here on AR9331 based Dragino-2 / VT MeshPotato-2  device

 - Software versions of LEDE release, packages, etc.

    Working
    DISTRIB_DESCRIPTION='LEDE Reboot SNAPSHOT r3306-91fce81' 

    Not Working
    DISTRIB_DESCRIPTION='LEDE Reboot SNAPSHOT r3307-649e766' 

 - Steps to reproduce
   Check out the required version of LEDE
   Remove .config
   Run 'make menuconfig' and select a suitable device
   Set up a suitable file in ./files/etc/config/wireless to set up AP and Meshpoint interface
   Run make
   Flash the sysupgrade file on to the device
   Run  'iw  dev' and check to see if both interface are working properly.
   In failure, the Meshpoint interface will not show a "channel" line in 'iw dev output.


Sample test results
-------------------
 Working
----------

DISTRIB_DESCRIPTION='LEDE Reboot SNAPSHOT r3306-91fce81' 
DISTRIB_REVISION='r3306-91fce81' Dragino
 
root at MP2-20:~# iw dev
phy#0
	Interface wlan0
		ifindex 7
		wdev 0x3
		addr 02:03:7f:11:22:33
		ssid MyTestAP
		type AP
		channel 1 (2412 MHz), width: 20 MHz, center1: 2412 MHz
		txpower 16.00 dBm
	Interface wlan0-1
		ifindex 6
		wdev 0x2
		addr 00:03:7f:11:22:33
		type mesh point
		channel 1 (2412 MHz), width: 20 MHz, center1: 2412 MHz
		txpower 16.00 dBm


Mem: 19992K used, 40440K free, 148K shrd, 2168K buff, 6232K cached
CPU:   5% usr   3% sys   0% nic  89% idle   0% io   0% irq   0% sirq
Load average: 0.38 0.39 0.17 1/41 1811
  PID  PPID USER     STAT   VSZ %VSZ %CPU COMMAND
 1200     1 root     S     1648   3%   1% /usr/sbin/hostapd -s -P /var/run/wifi
 1784  1695 root     R     1180   2%   1% top -d 2
  950     1 root     S     1672   3%   0% /sbin/netifd

------------------------------------------------------------

Not Working
-----------
DISTRIB_DESCRIPTION='LEDE Reboot SNAPSHOT r3307-649e766' 
DISTRIB_REVISION='r3307-649e766' Dragino

 
root at MP2-20:~# iw dev
phy#0
	Interface wlan0
		ifindex 7
		wdev 0x3
		addr 02:03:7f:11:22:33
		ssid MyTestAP
		type AP
		channel 1 (2412 MHz), width: 20 MHz, center1: 2412 MHz
		txpower 16.00 dBm
	Interface wlan0-1
		ifindex 6
		wdev 0x2
		addr 00:03:7f:11:22:33
		type mesh point
		txpower 16.00 dBm


Mem: 19624K used, 40808K free, 56K shrd, 2128K buff, 5604K cached
CPU:   0% usr  50% sys   0% nic  47% idle   0% io   0% irq   0% sirq
Load average: 2.24 1.75 0.83 7/40 2271
  PID  PPID USER     STAT   VSZ %VSZ %CPU COMMAND
 2162     2 root     RW       0   0%  50% [kworker/u2:2]
  578     1 root     R     1228   2%   1% /sbin/logd -S 64
 2163  2130 root     R     1184   2%   1% top -d2


Example wireless config file
----------------------------

config wifi-device 'radio0'
	option type 'mac80211'
	option phy 'phy0'
	option htmode 'HT20'
	option channel '1'
	option disabled '0'
	option coverage '5'

config wifi-iface 'ap_0'
	option device 'radio0'
	option ifname 'wlan0'
	option network 'lan'
	option mode 'ap'
	option ssid 'MyTestAP'
	option encryption 'psk2'
	option key 'mypassword'
	option hidden '0'
	option disabled '0'
	option isolate '0'

config wifi-iface 'ah_0'
	option device 'radio0'
	option ifname 'wlan0-1'
	option mode 'mesh'
	option mesh_id 'mytestmesh'
	option network 'mesh_0'
	option encryption 'none'
	option disabled '0'
	option mesh_fwding '0'

---------------------------------


More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=644