From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6AEC3C4CEC9 for ; Thu, 19 Sep 2019 00:40:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 362FC21907 for ; Thu, 19 Sep 2019 00:40:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="XFNu2t5B" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730182AbfISAkh (ORCPT ); Wed, 18 Sep 2019 20:40:37 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:39472 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727634AbfISAkh (ORCPT ); Wed, 18 Sep 2019 20:40:37 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x8J0dX9T024573; Thu, 19 Sep 2019 00:40:11 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=to : cc : subject : from : references : date : in-reply-to : message-id : mime-version : content-type; s=corp-2019-08-05; bh=IiS8L7N9j19Ktt7jiprEMiAHt8Lso8e0fWbUgEUG5V8=; b=XFNu2t5BvRu7qGRCCJQS1sWozs+CA4hh3L0XGMClLM2Cm3YnguEM8kkMdZ/FeoJTBnPR fjqurUlG/LDbpdST7E+qHopb8FFOZaYmlfDwkIDM8NZBWAMqDJTyIfh0nZuPlBk2WW83 /tnT5kacddQ8RpYRr2XsY/gkGZs0j4nTPYqyiaE5/C1hd+24H4Rg/Ue7NREL9OvhxUr3 csEkHfR5rt8rWtXOVYxuiByruFiOSDyMp8m6FMWLoNSOFpebRy5QhlE2xspTRU6bZbp2 SXI6b5cGophHGNpOZtJU6ZfoqMRUKV9Hnj7+GxpIBk0iijootjmPzXcD859YbGSSRpB1 hw== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2130.oracle.com with ESMTP id 2v3vb50jge-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 19 Sep 2019 00:40:11 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x8J0cKii096214; Thu, 19 Sep 2019 00:40:11 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3030.oracle.com with ESMTP id 2v3vb926j5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 19 Sep 2019 00:40:11 +0000 Received: from abhmp0020.oracle.com (abhmp0020.oracle.com [141.146.116.26]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x8J0e80I029874; Thu, 19 Sep 2019 00:40:08 GMT Received: from ca-mkp.ca.oracle.com (/10.159.214.123) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 18 Sep 2019 17:40:07 -0700 To: Christoph Hellwig Cc: Keith Busch , "sagi\@grimberg.me" , "linux-kernel\@vger.kernel.org" , "linux-nvme\@lists.infradead.org" , "Rakowski\, Michal" , "axboe\@fb.com" , "Baldyga\, Robert" Subject: Re: [PATCH 0/2] nvme: Add kernel API for admin command From: "Martin K. Petersen" Organization: Oracle Corporation References: <20190913111610.9958-1-robert.baldyga@intel.com> <20190913143709.GA8525@lst.de> <850977D77E4B5C41926C0A7E2DAC5E234F2C9C09@IRSMSX104.ger.corp.intel.com> <20190916073455.GA25515@lst.de> <850977D77E4B5C41926C0A7E2DAC5E234F2C9D03@IRSMSX104.ger.corp.intel.com> <20190917163909.GB34045@C02WT3WMHTD6.wdl.wdc.com> <20190918132611.GA16232@lst.de> <20190918170807.GA50966@C02WT3WMHTD6> <20190918170956.GA19639@lst.de> Date: Wed, 18 Sep 2019 20:40:05 -0400 In-Reply-To: <20190918170956.GA19639@lst.de> (Christoph Hellwig's message of "Wed, 18 Sep 2019 19:09:56 +0200") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.92 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9384 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=721 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1909190003 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9384 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=797 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1909190003 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Christoph, > On Wed, Sep 18, 2019 at 11:08:07AM -0600, Keith Busch wrote: >> And yes, that bouncing is really nasty, but it's really only needed for >> PRP, so maybe let's just not ignore that transfer mode and support >> extended metadata iff the controller supports SGLs. We just need a >> special SGL setup routine to weave the data and metadata. > > Well, what is the point? If people really want to use metadata they > should just buy a drive supporting the separate metadata pointer. In > fact I haven't had to deal with a drive that only supports interleaved > metadata so far given how awkward that is to deal with. Yep. There's a reason we did DIX... -- Martin K. Petersen Oracle Linux Engineering