Return-path: Received: from mail.candelatech.com ([208.74.158.172]:43458 "EHLO ns3.lanforge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933486Ab2HWAsO (ORCPT ); Wed, 22 Aug 2012 20:48:14 -0400 Message-ID: <50357DCB.1000908@candelatech.com> (sfid-20120823_024819_145263_285C60D0) Date: Wed, 22 Aug 2012 17:48:11 -0700 From: Ben Greear MIME-Version: 1.0 To: Felix Fietkau CC: "linux-wireless@vger.kernel.org" Subject: Re: Issue with ath9k and tx/rx chainmask: 3x3 doesn't work with mask of 0x1. References: <50329D11.9030405@candelatech.com> <5035414D.2080600@openwrt.org> <50355C21.2030508@candelatech.com> <503573C6.4000103@candelatech.com> In-Reply-To: <503573C6.4000103@candelatech.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: linux-wireless-owner@vger.kernel.org List-ID: On 08/22/2012 05:05 PM, Ben Greear wrote: > On 08/22/2012 03:24 PM, Ben Greear wrote: >> On 08/22/2012 01:30 PM, Felix Fietkau wrote: >>> On 2012-08-20 10:24 PM, Ben Greear wrote: >>>> I am trying to test out an attenuator. For now, I have only a single attenuator, >>>> so I set tx and rx chainmask to 0x1 on both AP and Station machine. >>>> >>>> I then connected channel 0 on the two machines together through the >>>> attenuator. >>>> >>>> I have two station interfaces on the station machine. They both >>>> seem to associate OK, but they cannot receive dhcp responses. >>>> >>>> It *seems* that broadcast packets may go through fine. >>>> >>>> If I force the rate down to 1x1 or 2x2 MIMO (or force disable /n >>>> and just use /a), then it appears to work fine. >>>> >>>> Nics are WPEA-127n (AR9380). Kernel is 3.5.1+ on AP, 3.5.2+ on station >>>> machine. >>>> >>>> I can see why forcing it down to 1x1 might work around some issue, >>>> but I find it funny that 2x2 works while 3x3 does not. >>> Did you set the chainmask manually via debugfs? If so, don't do that! >>> Use the nl80211 antenna control API (e.g. via iw) >> >> [root@lec2010-ath9k-1 lanforge]# ./local/sbin/iw phy wiphy0 set antenna 1 1 >> command failed: Operation not supported (-95) >> [root@lec2010-ath9k-1 lanforge]# ./local/sbin/iw phy wiphy0 set antenna 1 >> command failed: Operation not supported (-95) >> [root@lec2010-ath9k-1 lanforge]# ./local/sbin/iw phy wiphy0 set antenna 3 >> command failed: Operation not supported (-95) >> [root@lec2010-ath9k-1 lanforge]# ./local/sbin/iw phy wiphy0 set antenna 7 >> command failed: Operation not supported (-95) >> [root@lec2010-ath9k-1 lanforge]# uname -a >> Linux lec2010-ath9k-1 3.5.1+ #15 SMP PREEMPT Thu Aug 9 09:31:45 PDT 2012 i686 i686 i386 GNU/Linux > > I'm guessing it is because of this: > > static int ieee80211_set_antenna(struct wiphy *wiphy, u32 tx_ant, u32 rx_ant) > { > struct ieee80211_local *local = wiphy_priv(wiphy); > > if (local->started) > return -EOPNOTSUPP; > > return drv_set_antenna(local, tx_ant, rx_ant); > } Even when I manually admin down everything, I can still freeze the NIC (WPEA-127n, AR9380). To reproduce: stop all VAP/STA interfaces on wiphy0 set tx and rx chainmask to 2 using 'iw' start vap0 # Boom, fails to reset, and for whatever reason, local->started never # goes false, so you can't even set the chainmask back using 'iw'. Aug 22 17:41:34 localhost dhcpd: DHCPDISCOVER from 00:00:08:76:52:14 via rddVR17: network 99.88.77.0/24: no free leases Aug 22 17:41:37 localhost kernel: [ 5575.474706] ath: wiphy0: Unable to reset hardware; reset status -5 (freq 5785 MHz) Aug 22 17:41:38 localhost kernel: [ 5576.116434] ath: wiphy0: Unable to reset hardware; reset status -5 (freq 5785 MHz) Aug 22 17:41:38 localhost kernel: [ 5576.476336] ath: wiphy0: Unable to reset hardware; reset status -5 (freq 5785 MHz) Aug 22 17:41:45 localhost kernel: [ 5582.653715] ath: wiphy0: Unable to reset hardware; reset status -5 (freq 5785 MHz) Aug 22 17:41:46 localhost dhclient[18218]: DHCPDISCOVER on rddVR18 to 255.255.255.255 port 67 interval 11 Aug 22 17:41:46 localhost dhcpd: DHCPDISCOVER from 26:0c:f3:49:95:16 via rddVR17: network 99.88.77.0/24: no free leases Aug 22 17:41:47 localhost dhclient[18706]: DHCPDISCOVER on rddVR18#4 to 255.255.255.255 port 67 interval 14 Aug 22 17:41:47 localhost dhcpd: DHCPDISCOVER from 00:00:08:76:52:14 via rddVR17: network 99.88.77.0/24: no free leases Aug 22 17:41:57 localhost dhclient[18218]: DHCPDISCOVER on rddVR18 to 255.255.255.255 port 67 interval 7 Aug 22 17:41:57 localhost dhcpd: DHCPDISCOVER from 26:0c:f3:49:95:16 via rddVR17: network 99.88.77.0/24: no free leases Aug 22 17:41:59 localhost kernel: [ 5597.279989] in set_wiphy Aug 22 17:41:59 localhost kernel: [ 5597.296604] in set_wiphy Aug 22 17:41:59 localhost kernel: [ 5597.314646] in set_wiphy Aug 22 17:41:59 localhost kernel: [ 5597.319479] set antenna failed, local->started Aug 22 17:41:59 localhost kernel: [ 5597.326555] ops->set_antenna rv: -95 Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com