Return-path: Received: from server11.hostfactory.ch ([62.146.13.133]:44088 "EHLO server11.hostfactory.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758209AbbGHPfM (ORCPT ); Wed, 8 Jul 2015 11:35:12 -0400 Received: from [192.168.1.104] (ip5b41fe70.dynamic.kabel-deutschland.de [91.65.254.112]) by server11.hostfactory.ch (Postfix) with ESMTPSA id C29C860206BDF for ; Wed, 8 Jul 2015 17:28:53 +0200 (CEST) Message-ID: <559D41B3.4050604@weiss.ch> (sfid-20150708_173519_693963_814C5674) Date: Wed, 08 Jul 2015 17:28:51 +0200 From: Rolf Anderegg Reply-To: rolf.anderegg@weiss.ch MIME-Version: 1.0 To: linux-wireless@vger.kernel.org Subject: ath9k_htc: virtual interfaces, AP connection drop & kernel warning Content-Type: text/plain; charset=utf-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: I am having trouble with the following setup using ath9k_htc (AR9271): I would like to setup two virtual interfaces on a TP-Link Wireless USB adapter (TL-WN722N). ath0: AP (access point/master mode) with hostapd [1], on bridge br0 ath1: STA (station/managed mode) with wpa_supplicant AP works fine when STA is omitted (or wpa_supplicant is stopped). But when I try to operate both simultaneously (on the same channel), while the STA is up and stable, the AP can no longer hold a connection for longer than a few seconds. The hostapd syslogs either say that connection is dropped due to inactivity or failure to authenticate. Also, sometimes a slowpath kernel warning is dumped [2]. Kernel version is 3.12.10-rt15 (more environment info: [3]). When I try the same setup with a D-Link PCI card (DWL-G520) running with ath5k, AP and STA work smoothly side by side. So I'm wondering whether there are any known limitations or pitfalls when using virtual interfaces with ath9k_htc? Any hints or ideas would be greatly appreciated. Cheers, Rolf Anderegg [1] hostapd.conf: interface=ath0 bridge=br0 driver=nl80211 ssid=MAN301-0099_LAN hw_mode=g channel=8 auth_algs=3 wmm_enabled=1 wpa=3 wpa_psk_file=/etc/hostapd.wpa_psk wpa_key_mgmt=WPA-PSK wpa_pairwise=TKIP CCMP [2] kernel warning: [ 4142.857848] ------------[ cut here ]------------ [ 4142.857917] WARNING: CPU: 0 PID: 19211 at net/mac80211/agg-tx.c:699 ieee80211_start_tx_ba_cb+0xa5/0xf8 [mac80211]() [ 4142.857970] Modules linked in: bridge stp llc ipv6 snd_seq_dummy ppdev snd_dice snd_firewire_lib snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_page_alloc snd_seq_oss snd_seq_midi ath9k_htc snd_rawmidi ath9k_common ath9k_hw snd_seq_midi_event ath joydev snd_seq mac80211 microcode snd_seq_device snd_timer cfg80211 rfkill snd serio_raw soundcore lpc_ich mfd_core parport_pc fuse w83627hf hwmon_vid shpchp coretemp lp parport firewire_ohci ata_generic firewire_core pata_acpi r8169 mii [ 4142.857977] CPU: 0 PID: 19211 Comm: kworker/u8:0 Tainted: G W 3.12.10-rt15 #2 [ 4142.857980] Hardware name: /D510MO, BIOS MOPNV10N.86A.0516.2011.0331.1730 03/31/2011 [ 4142.858051] Workqueue: phy0 ieee80211_iface_work [mac80211] [ 4142.858063] 00000000 00000000 f625beb8 c15dba8f 00000000 f625bed0 c102d255 f95cfb0c [ 4142.858073] 00000000 f2e62534 f27f3ad0 f625bee0 c102d2e1 00000009 00000000 f625bf00 [ 4142.858082] f95cfb0c f3f48c18 f2e62360 f27f3800 f26bfc80 f3f48c00 f3fb28c0 f625bf28 [ 4142.858084] Call Trace: [ 4142.858096] [] dump_stack+0x49/0x80 [ 4142.858104] [] warn_slowpath_common+0x66/0x7d [ 4142.858146] [] ? ieee80211_start_tx_ba_cb+0xa5/0xf8 [mac80211] [ 4142.858152] [] warn_slowpath_null+0x14/0x18 [ 4142.858192] [] ieee80211_start_tx_ba_cb+0xa5/0xf8 [mac80211] [ 4142.858234] [] ieee80211_iface_work+0x99/0x253 [mac80211] [ 4142.858243] [] process_one_work+0x146/0x253 [ 4142.858249] [] worker_thread+0x137/0x1d9 [ 4142.858255] [] ? rescuer_thread+0x22f/0x22f [ 4142.858260] [] kthread+0x74/0x79 [ 4142.858268] [] ret_from_kernel_thread+0x1b/0x28 [ 4142.858274] [] ? __kthread_parkme+0x59/0x59 [ 4142.858289] ---[ end trace 0000000000000003 ]--- [3] environment summary: :~$ uname -srvmpio Linux 3.12.10-rt15 #2 SMP PREEMPT RT Tue Jun 9 16:17:55 CEST 2015 i686 i686 i686 GNU/Linux :~$ lsusb -s 1:3 Bus 001 Device 003: ID 0cf3:9271 Atheros Communications, Inc. AR9271 802.11n :~$ wpa_supplicant -v wpa_supplicant v2.4 :~$ sudo wpa_cli status Selected interface 'ath1' bssid=b8:a3:86:14:d3:ee freq=2447 ssid=Kakofon id=0 id_str=ath1 mode=station pairwise_cipher=CCMP group_cipher=TKIP key_mgmt=WPA2-PSK wpa_state=COMPLETED ip_address=192.168.1.102 address=c6:4a:00:1b:c2:98 :~$ hostapd -v hostapd v2.4 :~$ sudo hostapd_cli status Selected interface 'ath0' state=ENABLED phy=phy0 freq=2447 num_sta_non_erp=0 num_sta_no_short_slot_time=0 num_sta_no_short_preamble=0 olbc=0 num_sta_ht_no_gf=0 num_sta_no_ht=0 num_sta_ht_20_mhz=0 num_sta_ht40_intolerant=0 olbc_ht=0 ht_op_mode=0x0 cac_time_seconds=0 cac_time_left_seconds=N/A channel=8 secondary_channel=0 ieee80211n=0 ieee80211ac=0 vht_oper_chwidth=0 vht_oper_centr_freq_seg0_idx=0 vht_oper_centr_freq_seg1_idx=0 bss[0]=ath0 bssid[0]=c0:4a:00:1b:c2:98 ssid[0]=MAN301-0099_LAN num_sta[0]=0 :~$ cat /sys/module/ath9k_htc/parameters/nohwcrypt 1 :~$ lsmod | grep ath9k ath9k_htc 46002 0 ath9k_common 2153 1 ath9k_htc ath9k_hw 370729 2 ath9k_common,ath9k_htc ath 12554 3 ath9k_common,ath9k_htc,ath9k_hw mac80211 366454 1 ath9k_htc cfg80211 330733 3 ath,mac80211,ath9k_htc [4]: pre/post-up commands: Creating ath0 (preup): iw dev wlan0 interface add ath0 type __ap Starting hostapd (postup): hostapd -B -P /var/run/hostapd.br_ap.pid /etc/hostapd.conf Creating ath1 (preup): iw dev wlan0 interface add ath1 type station ip link set ath1 address ${ALT_HW_ADDR} Starting wpa_supplicant (postup): wpa_supplicant -Dnl80211 -P/var/run/wpa_supplicant.pid -c /etc/wpa_supplicant.conf -B -d -iath1