From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by dpdk.org (Postfix) with ESMTP id 53FFD1C9E6; Mon, 14 May 2018 19:10:04 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 May 2018 10:10:03 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,400,1520924400"; d="scan'208";a="55085990" Received: from aburakov-mobl.ger.corp.intel.com (HELO [10.252.6.248]) ([10.252.6.248]) by fmsmga001.fm.intel.com with ESMTP; 14 May 2018 10:10:02 -0700 To: Rosen Xu , dev@dpdk.org Cc: gaetan.rivet@6wind.com, john.mcnamara@intel.com, yulong.pei@intel.com, stable@dpdk.org References: <1526294652-102665-1-git-send-email-rosen.xu@intel.com> From: "Burakov, Anatoly" Message-ID: <6b9962cf-1b50-0cf7-83e6-d9fe696c62bf@intel.com> Date: Mon, 14 May 2018 18:10:01 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <1526294652-102665-1-git-send-email-rosen.xu@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-stable] [PATCH] doc/guides/rel_notes: Add known issue for IOMMU attributes read X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 May 2018 17:10:05 -0000 On 14-May-18 11:44 AM, Rosen Xu wrote: > Read IOMMU attributes from linux kernle 4.10.0 error. s/kernle/kernel :) > > Cc: stable@dpdk.org > > Signed-off-by: Rosen Xu > --- > doc/guides/rel_notes/known_issues.rst | 21 +++++++++++++++++++++ > 1 file changed, 21 insertions(+) > > diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst > index afcc2c4..74876ff 100644 > --- a/doc/guides/rel_notes/known_issues.rst > +++ b/doc/guides/rel_notes/known_issues.rst > @@ -714,3 +714,24 @@ igb_uio can not be used when running l3fwd-power > > **Driver/Module**: > ``igb_uio`` module. > + > + > +linux kernel iommu attribute read error Should this be capitalized? > +--------------------------------------- > + > +**Description**: > + Read immu attributes from /sys/devices/virtual/iommu/dmarXXX/intel-iommu/cap in linux kernel > + 4.10.0 error. That because the link between the iommu sysfs-device and the struct intel_iommu > + is no longer stored as driver-data. s/immu/IOMMU/, and i think this needs to be rewritten to something like as follows: Reading IOMMU attributes from /sys/devices/virtual/iommu/dmarXXX/intel-iommu/cap in Linux kernel 4.10.0 results in an error. This is because the link between the IOMMU sysfs-device and struct intel_iommu is no longer stored as driver-data. (i have no idea what that last sentence means, maybe someone could help provide a better explanation?) > + > +**Implication**: > + When insmod ``vfio-pci`` and running testpmd APP, it doesn't initiate properly. Should probably be reworded as follows: When binding devices to VFIO and attempting to run testpmd application, testpmd (and other DPDK applications) will not initialize. > + > +**Resolution/Workaround**: > + Use other linux kernel version. It only happens in linux kernel 4.10.0. > + > +**Affected Environment/Platform**: > + ALL OS of linux kernel 4.10.0. > + > +**Driver/Module**: > + ``vfio-pci`` module. > -- Thanks, Anatoly