Re: Iwlwifi 3160 AC (firmware?) clashes with CONFIG_IWLWIFI_BCAST_FILTERING

Hi Christian,

I'm not the best person to talk about the iwlwifi firmwares (that would
be Emmanuel, but he is not available now), but I'll try.

On Sat, 2014-08-23 at 00:01 +0200, Christian Lamparter wrote:

Hello,

I got new hardware. Among the new stuff, there was one
Intel® Dual Band Wireless-AC 3160. When I tried to connect
to one (in fact any) of my networks, I was getting the
following errors:

[ 1021.092378] iwlwifi 0000:01:00.0: Microcode SW error detected.  Restarting 0x82000000.
[...]
[ 1021.093935] iwlwifi 0000:01:00.0: Start IWL Error Log Dump:
[ 1021.093939] iwlwifi 0000:01:00.0: Status: 0x00000000, count: 6
[ 1021.093942] iwlwifi 0000:01:00.0: Loaded firmware version: 25.223.9.0
[ 1021.093947] iwlwifi 0000:01:00.0: 0x00000038 | BAD_COMMAND <---                
[ 1021.093951] iwlwifi 0000:01:00.0: 0x00A00220 | uPc

Where did you get this firmware version? AFAICT the last version
Emmanuel sent to linux-firmware.git is 23.214.9.0 (the one you also
mentioned below).

[...]
[ 1021.094192] Call Trace:
[ 1021.094205]  [<ffffffff813ce9bd>] ? dump_stack+0x41/0x51
[ 1021.094217]  [<ffffffffa0b9cd8b>] ? iwl_trans_pcie_send_hcmd+0x367/0x438 [iwlwifi]
[ 1021.094226]  [<ffffffffa0b9b52c>] ? iwl_pcie_enqueue_hcmd+0x5e3/0x5fe [iwlwifi]
[ 1021.094235]  [<ffffffff8105fd4c>] ? finish_wait+0x5d/0x5d
[ 1021.094250]  [<ffffffffa0d50106>] ? iwl_mvm_send_cmd+0xd/0x22 [iwlmvm]
[ 1021.094262]  [<ffffffffa0d50160>] ? iwl_mvm_send_cmd_pdu+0x45/0x52 [iwlmvm]
[ 1021.094273]  [<ffffffffa0d4c5fb>] ? iwl_mvm_configure_bcast_filter.isra.14.part.15+0x36/0x3f [iwlmvm]

(Full log attached below)

What cough my eye was the "BAD_COMMAND" in the error log. I disabled
"CONFIG_IWLWIFI_BCAST_FILTERING" option and the 3160 is now working.

As far as I can tell, there is already a firmware feature flag:
"IWL_UCODE_TLV_FLAGS_BCAST_FILTERING" which can be used to
distinguish whenever the feature is supported or not. But it
seems to be "stuck on" for the 3160.

Weird, but it's possible that they set the flag mistakenly for the 3160
firmware.  I'll check this with the firmware team.

Regards
Christian

BTW: I also tried the older "23.214.9.0" firmware too.
=> Same result [Doesn't work with BCAST_FILTERING enabled].

Thanks a lot for your report! Broadcast filtering is not set by default,
so I haven't seen that bug before.

--
Cheers,
Luca.