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=-5.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 655FBC2D0A3 for ; Mon, 9 Nov 2020 09:13:08 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E728D207BC for ; Mon, 9 Nov 2020 09:13:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="RnZejnzc" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E728D207BC Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=IHzVmKFNHPt+hM5WCfzaMltty7cIDBctg0AZl4jZ5NE=; b=RnZejnzcPfpwV59e/bot8QWPH fTISmbd8XU9/M2FrGUQ1sGlN5sKgOD14JZN9TSoNkQcs/Aoh26d87e2X02NAiZfzh0wFl7JdNw/ub rK2PXwj2VBK5DIQ7BbxSQprrzME0AJ9rwlxNaVVIPHhl0t9wRRaraFVDsIdOncyrc4XEU/7krTlV0 cQTOfcVXFXtLaaZQqVtwpby7jEQSR5za2Xpix2vqAtshYP+amuRs75HypM7BZeOWzNYETq/ki8QoY EZFdXBqgj152TQ4y1vI4CmqlYeU2HjYMF931IYHc2zx21AXeJ8Ax0TKHJ0cSOl1pTnQl0ywlDOHcI yUYpol0Tg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kc3EW-0003oU-P5; Mon, 09 Nov 2020 09:13:04 +0000 Received: from verein.lst.de ([213.95.11.211]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kc3ES-0003mH-6v for linux-nvme@lists.infradead.org; Mon, 09 Nov 2020 09:13:02 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id 8929268AFE; Mon, 9 Nov 2020 10:12:58 +0100 (CET) Date: Mon, 9 Nov 2020 10:12:58 +0100 From: Christoph Hellwig To: Logan Gunthorpe Subject: Re: [RFC PATCH 04/15] lib/scatterlist: Add flag for indicating P2PDMA segments in an SGL Message-ID: <20201109091258.GB28918@lst.de> References: <20201106170036.18713-1-logang@deltatee.com> <20201106170036.18713-5-logang@deltatee.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20201106170036.18713-5-logang@deltatee.com> User-Agent: Mutt/1.5.17 (2007-11-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201109_041301_236533_D44B4C2C X-CRM114-Status: UNSURE ( 9.30 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Matthew Wilcox , Jason Gunthorpe , linux-pci@vger.kernel.org, Daniel Vetter , Ira Weiny , linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, Stephen Bates , linux-block@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Don Dutile , Christian =?iso-8859-1?Q?K=F6nig?= , John Hubbard , Dan Williams , Christoph Hellwig Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Fri, Nov 06, 2020 at 10:00:25AM -0700, Logan Gunthorpe wrote: > We make use of the top bit of the dma_length to indicate a P2PDMA > segment. I don't think "we" can. There is nothing limiting the size of a SGL segment. _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme