The issue of "wl12xx: Beacon loss detected"

Wei Li

Other Parts Discussed in Thread: WL1271, WL1831

Hi TI,

Now, our systems always disconnect wifi AP by "wl12xx: Beacon loss detected". The wifi modules we use are WL1271 and WL1831. The driver and FW are the latest.

Do you know how to set the timeout for Beacon? Is it related to driver\wpa_supplicant\Network Manager? How to config "Beacon" for WL1271 and WL1831?

The log for re-connecting AP is below:

[26296.953308] wl12xx: Beacon loss detected.
[26298.308288] wlan0: deauthenticating from c4:04:15:1b:c8:94 by local choice (reason=3)
[26298.385192] wlan0: moving STA c4:04:15:1b:c8:94 to state 2
[26298.385192] wlan0: moving STA c4:04:15:1b:c8:94 to state 1
[26298.385192] wlan0: moving STA c4:04:15:1b:c8:94 to state 0
[26298.434265] cfg80211: Calling CRDA to update world regulatory domain
[26298.445831] cfg80211: World regulatory domain updated:
[26298.451416] cfg80211:     (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[26298.462493] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[26298.471038] cfg80211:     (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[26298.480316] cfg80211:     (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[26298.488800] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[26298.497375] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[26299.361999] wlan0: authenticate with c4:04:15:1b:c8:94 (try 1)
[26299.364410] wlan0: authenticated
[26299.393341] wlan0: associate with c4:04:15:1b:c8:94 (try 1)
[26299.396789] wlan0: RX AssocResp from c4:04:15:1b:c8:94 (capab=0x411 status=0 aid=2)
[26299.396789] wlan0: associated
[26299.396820] wlan0: moving STA c4:04:15:1b:c8:94 to state 1
[26299.396820] wlan0: moving STA c4:04:15:1b:c8:94 to state 2
[26299.417480] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[26299.455566] wl12xx: Association completed.
[26299.460510] wlan0: moving STA c4:04:15:1b:c8:94 to state 3
[26310.463165] wlan0: no IPv6 routers present

Thanks,

Wei

over 9 years ago

0 Joseph Gigi over 9 years ago

TI__Guru* 85400 points

Hi Wei,

This looks like some antenna issue to me...
Can you check if the connections are proper?

Regards,
Gigi Joseph.

0 Wei Li over 9 years ago in reply to Joseph Gigi

Intellectual 620 points

Hi Joseph,

It happens sometimes. Maybe the network is poor. But is there some settings for Beacon in software?

Thanks,
Wei

0 Joseph Gigi over 9 years ago in reply to Wei Li

TI__Guru* 85400 points

Hi Wei,

You can configure the beacon interval for the WL6/WL8 AP in hostapd.conf. Please see the parameter: "beacon_int"

Regards,
Gigi Joseph.

0 Wei Li over 9 years ago in reply to Joseph Gigi

Intellectual 620 points

Hi Joseph,

On my system, the "beacon_int" in hostapd.conf is 100. What does it mean? Could I change it larger or smaller?
But I use "cat /sys/kernel/debug/ieee80211/phy0/wlcore/beacon_interval" to see the value is 0.
Why they are different? Which is right?

Thanks,
Wei

0 Joseph Gigi over 9 years ago in reply to Wei Li

TI__Guru* 85400 points

Hi Wei,

The beacon_int is the time interval between two beacons (a special frame transmitted by the Access Point). You can check the 802.11 standard for more information.

The hostapd.conf is the configuration file for WL18xx acting in AP mode.
In your case, it seems to me that the wl18xx is a STA connected to a commercial AP. So changing the beacon_int won't help if it is STA role.

The "beacon loss" message is seen when the wl18xx STA misses 12 (configurable) successive beacons and the AP does not respond to a PROBE REQUEST by the wl18xx STA.

It is possible to change the "number of beacons missed" - please see "synch_fail_thold" (drivers/net/wireless/ti/wl18xx/main.c).

Regards,
Gigi Joseph.

0 Wei Li over 9 years ago in reply to Joseph Gigi

Intellectual 620 points

Hi Joseph,

Thank you very much. I'll have a try.

Thanks,
Wei

0 Wei Li over 9 years ago in reply to Joseph Gigi

Intellectual 620 points

Hi Joseph,

If wl18xx STA misses 12 successive beacons, then STA will send a PROBE REQUEST to the AP, right? The FW of wl1831 auto send it, or need be setting? It only send one PROBE REQUEST, the number of PROBE REQUEST can be set?

Thanks,

Wien

0 Wei Li over 9 years ago in reply to Joseph Gigi

Intellectual 620 points

Hi Joseph,

Another question, can the FW of wl1831 detect the network status? I mean, our FW can know the network signal or load is good/heavy or bad/idle? For example, A(wl1831), B(another STA), C(AP), when there have a lot of data transfer between B and C, can A detect it and report to our driver/App?

Thanks,
Wien

0 Shahar Patury over 9 years ago in reply to Wei Li

TI__Expert 5840 points

Hi Wien,

When the WL8 get 12 consecutive Missed beacons, he will send 2 Probe Requests to the AP. this is done automatically and no need to configure
The number of probes is also not part of the configuration, and there for can't be changed.

For the second question, no, there is no option to report that information (the device is not "sniffing" the air, and actually will want to go to sleep if possible, and turn off the radio)

Shahar

0 Wei Li over 9 years ago in reply to Shahar Patury

Intellectual 620 points

Hi Shahar,

If wl1831 is configed to "no sleep", what's the behavior in the statuation?

In our case, we hope wl1831 can work on performance, don't care the power consumer, so let it don't sleep, need do some other configs? Does it has some problems, if we don't let it go to sleep?

Thanks,

Wien

0 Shahar Patury over 9 years ago in reply to Wei Li

TI__Expert 5840 points

Hi Wien,

There is no difference in the behavior of the device reception (and losing) of beacons when the device is fully awake or in sleep mode.

Shahar

0 Wei Li over 9 years ago in reply to Shahar Patury

Intellectual 620 points

Hi Shahar,

Got it! Thank you.

Thanks,
Wien

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The issue of "wl12xx: Beacon loss detected"