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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA7F5C4332F for ; Thu, 30 Sep 2021 16:20:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B17916141B for ; Thu, 30 Sep 2021 16:20:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349834AbhI3QVw (ORCPT ); Thu, 30 Sep 2021 12:21:52 -0400 Received: from mail-pl1-f171.google.com ([209.85.214.171]:41907 "EHLO mail-pl1-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349579AbhI3QVv (ORCPT ); Thu, 30 Sep 2021 12:21:51 -0400 Received: by mail-pl1-f171.google.com with SMTP id x8so4394907plv.8; Thu, 30 Sep 2021 09:20:09 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=yG1/o+/DnMH77sK/4dZhI1SBFsLkmeMylzKyExyvyVo=; b=VMOMxXrk3WipEBkwtyRKsqEK/+hGcd6Xyv2//4vlFXzFr4kYcDxEG8qPMfLnEJCU46 L7lGjp3A0jTO7A2w8Nu9vj/3qfEVpzcHp31SFcuzf94+yQmtPAh9QBCO9Y3Jnmutz2xw MW6bzrww9mCCWv3YOkSvSuLEczumDBQJ90fmE/1PAdpbxWqCsNk8VgYGoV5dw1vL18hT H11wBYoQlxdKpldScRPa3o3ayID3taRq+xPtIPuGhyMcH8kdQlFOyVpF688PGFKjum+8 LnyIqX5W5cgx7EUQDNi1C7LTqesPp3ShBYA1LoOaNYByN+Xxo+D51IMNoDFDWmGKUkwr gfJw== X-Gm-Message-State: AOAM530cKxHipAVZYvrPwObMt6VEtaijjkgs3l4IOMchU6wlXElRJ/Ft Z6HvhDfPKGLUXEd1CrQLx1g= X-Google-Smtp-Source: ABdhPJzaCOnFZETcMKaHwCPxzFz713M2S082LglpsjtX0j5t65Ek+coBFDcqzxklnkgshMeKu30lrQ== X-Received: by 2002:a17:90b:104d:: with SMTP id gq13mr14201836pjb.101.1633018808562; Thu, 30 Sep 2021 09:20:08 -0700 (PDT) Received: from [10.254.204.66] (50-242-106-94-static.hfc.comcastbusiness.net. [50.242.106.94]) by smtp.gmail.com with ESMTPSA id t15sm3663221pgi.80.2021.09.30.09.20.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 30 Sep 2021 09:20:07 -0700 (PDT) Subject: Re: [LSF/MM/BFP ATTEND] [LSF/MM/BFP TOPIC] Storage: Copy Offload To: =?UTF-8?Q?Javier_Gonz=c3=a1lez?= , Johannes Thumshirn Cc: Chaitanya Kulkarni , "linux-block@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "linux-nvme@lists.infradead.org" , "dm-devel@redhat.com" , "lsf-pc@lists.linux-foundation.org" , "axboe@kernel.dk" , "msnitzer@redhat.com" , "martin.petersen@oracle.com" , "roland@purestorage.com" , "mpatocka@redhat.com" , "hare@suse.de" , "kbusch@kernel.org" , "rwheeler@redhat.com" , "hch@lst.de" , "Frederick.Knight@netapp.com" , "zach.brown@ni.com" , "osandov@fb.com" , Adam Manzanares , SelvaKumar S , Nitesh Shetty , Kanchan Joshi , Vincent Fu References: <20210928191340.dcoj7qrclpudtjbo@mpHalley.domain_not_set.invalid> From: Bart Van Assche Message-ID: Date: Thu, 30 Sep 2021 09:20:04 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: <20210928191340.dcoj7qrclpudtjbo@mpHalley.domain_not_set.invalid> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 9/28/21 12:13 PM, Javier González wrote: > Since we are not going to be able to talk about this at LSF/MM, a few of > us thought about holding a dedicated virtual discussion about Copy > Offload. I believe we can use Chaitanya's thread as a start. Given the > current state of the current patches, I would propose that we focus on > the next step to get the minimal patchset that can go upstream so that > we can build from there. > > Before we try to find a date and a time that fits most of us, who would > be interested in participating? Given the technical complexity of this topic and also that the people who are interested live in multiple time zones, I prefer email to discuss the technical aspects of this work. My attempt to summarize how to implement copy offloading is available here: https://github.com/bvanassche/linux-kernel-copy-offload. Feedback on this text is welcome. Thanks, Bart. 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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0F427C433F5 for ; Thu, 30 Sep 2021 16:21:17 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 C63AF613CE for ; Thu, 30 Sep 2021 16:21:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org C63AF613CE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=acm.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:Cc:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=wHqgFOr1KKSOY9KRxwZqEf1MilVfUWFAHjmeALRQT2A=; b=wGZWLYe74yy3jSDsxITCn206DD IEswby76jjpo4UAIqojXlBCe24032r7rX9KyPLe6D6dnnzivZYiieVC1vKZwLC/UWwwuYl9gFnbeF YeSjf9a09tpkxq/46v9sYKOEX8Ipd1p0npPlykZbZ5/4CvOaRxF9Abp1tPw34A/D/esdNAcXHra0W nMvBr86JEWqyQ7in9zYJBv+sN+VBkOyRhzpnQ49o1DgcDONdioCQkcB1ahIuYFcAF/xIyv5w/JfRb rqt1/v+gNafO4gc+tmGjiOJzvR4CBZ77numI6dpTWKu20I1z1gfH5emPXkBVz5WVfu5IEAzvUB974 AK4ggQLg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mVyn7-00FCv4-Se; Thu, 30 Sep 2021 16:20:13 +0000 Received: from mail-pj1-f54.google.com ([209.85.216.54]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mVyn3-00FCsv-GT for linux-nvme@lists.infradead.org; Thu, 30 Sep 2021 16:20:11 +0000 Received: by mail-pj1-f54.google.com with SMTP id me5-20020a17090b17c500b0019af76b7bb4so7153444pjb.2 for ; Thu, 30 Sep 2021 09:20:09 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=yG1/o+/DnMH77sK/4dZhI1SBFsLkmeMylzKyExyvyVo=; b=mZ7nUC2sURSmL3c6AXI6xKr+EUq/du15q+H2PiK8fgcrJZUXDgEVPmxEzspo5xfos9 vS4EnhY6dZIZOCcnQpmyJiGfFLNDblLgGMzW2e2Cy3JH7sjgAPBmnfMzsUfsWGucfdgV PjH3qD3yssN73sXf5MtIIK4Y+j9JIgTHXF4nGahDPgzAeLJ5D6zoU+s3EWI+nBsiYw3k 8b4OHx8WPznXe83YlpsJLbZduVht/KE3CQYwtsm/BgFEgDKBa6ko+hrS/hTODmBjsith si2oxzEO5caaXnanV6hVkrN2yh3GOq9mWzKlB8p7Zd7d8ojXZpKSbQIdIK8EPY/MQqj7 brWQ== X-Gm-Message-State: AOAM530VwgBVOdLLtuwaxCdNe5U9IPh2yxCJWXq+e1d/SffOymrOF10n 7IcTFwx4iwjulKRxL/ogE9U= X-Google-Smtp-Source: ABdhPJzaCOnFZETcMKaHwCPxzFz713M2S082LglpsjtX0j5t65Ek+coBFDcqzxklnkgshMeKu30lrQ== X-Received: by 2002:a17:90b:104d:: with SMTP id gq13mr14201836pjb.101.1633018808562; Thu, 30 Sep 2021 09:20:08 -0700 (PDT) Received: from [10.254.204.66] (50-242-106-94-static.hfc.comcastbusiness.net. [50.242.106.94]) by smtp.gmail.com with ESMTPSA id t15sm3663221pgi.80.2021.09.30.09.20.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 30 Sep 2021 09:20:07 -0700 (PDT) Subject: Re: [LSF/MM/BFP ATTEND] [LSF/MM/BFP TOPIC] Storage: Copy Offload To: =?UTF-8?Q?Javier_Gonz=c3=a1lez?= , Johannes Thumshirn Cc: Chaitanya Kulkarni , "linux-block@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "linux-nvme@lists.infradead.org" , "dm-devel@redhat.com" , "lsf-pc@lists.linux-foundation.org" , "axboe@kernel.dk" , "msnitzer@redhat.com" , "martin.petersen@oracle.com" , "roland@purestorage.com" , "mpatocka@redhat.com" , "hare@suse.de" , "kbusch@kernel.org" , "rwheeler@redhat.com" , "hch@lst.de" , "Frederick.Knight@netapp.com" , "zach.brown@ni.com" , "osandov@fb.com" , Adam Manzanares , SelvaKumar S , Nitesh Shetty , Kanchan Joshi , Vincent Fu References: <20210928191340.dcoj7qrclpudtjbo@mpHalley.domain_not_set.invalid> From: Bart Van Assche Message-ID: Date: Thu, 30 Sep 2021 09:20:04 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: <20210928191340.dcoj7qrclpudtjbo@mpHalley.domain_not_set.invalid> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210930_092009_611734_7FAF35F7 X-CRM114-Status: GOOD ( 14.69 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org T24gOS8yOC8yMSAxMjoxMyBQTSwgSmF2aWVyIEdvbnrDoWxleiB3cm90ZToKPiBTaW5jZSB3ZSBh cmUgbm90IGdvaW5nIHRvIGJlIGFibGUgdG8gdGFsayBhYm91dCB0aGlzIGF0IExTRi9NTSwgYSBm ZXcgb2YKPiB1cyB0aG91Z2h0IGFib3V0IGhvbGRpbmcgYSBkZWRpY2F0ZWQgdmlydHVhbCBkaXNj dXNzaW9uIGFib3V0IENvcHkKPiBPZmZsb2FkLiBJIGJlbGlldmUgd2UgY2FuIHVzZSBDaGFpdGFu eWEncyB0aHJlYWQgYXMgYSBzdGFydC4gR2l2ZW4gdGhlCj4gY3VycmVudCBzdGF0ZSBvZiB0aGUg Y3VycmVudCBwYXRjaGVzLCBJIHdvdWxkIHByb3Bvc2UgdGhhdCB3ZSBmb2N1cyBvbgo+IHRoZSBu ZXh0IHN0ZXAgdG8gZ2V0IHRoZSBtaW5pbWFsIHBhdGNoc2V0IHRoYXQgY2FuIGdvIHVwc3RyZWFt IHNvIHRoYXQKPiB3ZSBjYW4gYnVpbGQgZnJvbSB0aGVyZS4KPiAKPiBCZWZvcmUgd2UgdHJ5IHRv IGZpbmQgYSBkYXRlIGFuZCBhIHRpbWUgdGhhdCBmaXRzIG1vc3Qgb2YgdXMsIHdobyB3b3VsZAo+ IGJlIGludGVyZXN0ZWQgaW4gcGFydGljaXBhdGluZz8KCkdpdmVuIHRoZSB0ZWNobmljYWwgY29t cGxleGl0eSBvZiB0aGlzIHRvcGljIGFuZCBhbHNvIHRoYXQgdGhlIHBlb3BsZSB3aG8gYXJlCmlu dGVyZXN0ZWQgbGl2ZSBpbiBtdWx0aXBsZSB0aW1lIHpvbmVzLCBJIHByZWZlciBlbWFpbCB0byBk aXNjdXNzIHRoZSB0ZWNobmljYWwKYXNwZWN0cyBvZiB0aGlzIHdvcmsuIE15IGF0dGVtcHQgdG8g c3VtbWFyaXplIGhvdyB0byBpbXBsZW1lbnQgY29weSBvZmZsb2FkaW5nCmlzIGF2YWlsYWJsZSBo ZXJlOiBodHRwczovL2dpdGh1Yi5jb20vYnZhbmFzc2NoZS9saW51eC1rZXJuZWwtY29weS1vZmZs b2FkLgpGZWVkYmFjayBvbiB0aGlzIHRleHQgaXMgd2VsY29tZS4KClRoYW5rcywKCkJhcnQuCgpf X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpMaW51eC1udm1l IG1haWxpbmcgbGlzdApMaW51eC1udm1lQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3Rz LmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1udm1lCg== 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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A264BC433F5 for ; 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[50.242.106.94]) by smtp.gmail.com with ESMTPSA id t15sm3663221pgi.80.2021.09.30.09.20.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 30 Sep 2021 09:20:07 -0700 (PDT) To: =?UTF-8?Q?Javier_Gonz=c3=a1lez?= , Johannes Thumshirn References: <20210928191340.dcoj7qrclpudtjbo@mpHalley.domain_not_set.invalid> From: Bart Van Assche Message-ID: Date: Thu, 30 Sep 2021 09:20:04 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: <20210928191340.dcoj7qrclpudtjbo@mpHalley.domain_not_set.invalid> X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-loop: dm-devel@redhat.com Cc: Vincent Fu , "linux-nvme@lists.infradead.org" , "dm-devel@redhat.com" , Adam Manzanares , "osandov@fb.com" , "msnitzer@redhat.com" , "linux-scsi@vger.kernel.org" , "hch@lst.de" , "roland@purestorage.com" , Nitesh Shetty , "zach.brown@ni.com" , SelvaKumar S , Chaitanya Kulkarni , "linux-block@vger.kernel.org" , "mpatocka@redhat.com" , "kbusch@kernel.org" , "Frederick.Knight@netapp.com" , "axboe@kernel.dk" , "martin.petersen@oracle.com" , Kanchan Joshi , "lsf-pc@lists.linux-foundation.org" , "rwheeler@redhat.com" Subject: Re: [dm-devel] [LSF/MM/BFP ATTEND] [LSF/MM/BFP TOPIC] Storage: Copy Offload X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" T24gOS8yOC8yMSAxMjoxMyBQTSwgSmF2aWVyIEdvbnrDoWxleiB3cm90ZToKPiBTaW5jZSB3ZSBh cmUgbm90IGdvaW5nIHRvIGJlIGFibGUgdG8gdGFsayBhYm91dCB0aGlzIGF0IExTRi9NTSwgYSBm ZXcgb2YKPiB1cyB0aG91Z2h0IGFib3V0IGhvbGRpbmcgYSBkZWRpY2F0ZWQgdmlydHVhbCBkaXNj dXNzaW9uIGFib3V0IENvcHkKPiBPZmZsb2FkLiBJIGJlbGlldmUgd2UgY2FuIHVzZSBDaGFpdGFu eWEncyB0aHJlYWQgYXMgYSBzdGFydC4gR2l2ZW4gdGhlCj4gY3VycmVudCBzdGF0ZSBvZiB0aGUg Y3VycmVudCBwYXRjaGVzLCBJIHdvdWxkIHByb3Bvc2UgdGhhdCB3ZSBmb2N1cyBvbgo+IHRoZSBu ZXh0IHN0ZXAgdG8gZ2V0IHRoZSBtaW5pbWFsIHBhdGNoc2V0IHRoYXQgY2FuIGdvIHVwc3RyZWFt IHNvIHRoYXQKPiB3ZSBjYW4gYnVpbGQgZnJvbSB0aGVyZS4KPiAKPiBCZWZvcmUgd2UgdHJ5IHRv IGZpbmQgYSBkYXRlIGFuZCBhIHRpbWUgdGhhdCBmaXRzIG1vc3Qgb2YgdXMsIHdobyB3b3VsZAo+ IGJlIGludGVyZXN0ZWQgaW4gcGFydGljaXBhdGluZz8KCkdpdmVuIHRoZSB0ZWNobmljYWwgY29t cGxleGl0eSBvZiB0aGlzIHRvcGljIGFuZCBhbHNvIHRoYXQgdGhlIHBlb3BsZSB3aG8gYXJlCmlu dGVyZXN0ZWQgbGl2ZSBpbiBtdWx0aXBsZSB0aW1lIHpvbmVzLCBJIHByZWZlciBlbWFpbCB0byBk aXNjdXNzIHRoZSB0ZWNobmljYWwKYXNwZWN0cyBvZiB0aGlzIHdvcmsuIE15IGF0dGVtcHQgdG8g c3VtbWFyaXplIGhvdyB0byBpbXBsZW1lbnQgY29weSBvZmZsb2FkaW5nCmlzIGF2YWlsYWJsZSBo ZXJlOiBodHRwczovL2dpdGh1Yi5jb20vYnZhbmFzc2NoZS9saW51eC1rZXJuZWwtY29weS1vZmZs b2FkLgpGZWVkYmFjayBvbiB0aGlzIHRleHQgaXMgd2VsY29tZS4KClRoYW5rcywKCkJhcnQuCgot LQpkbS1kZXZlbCBtYWlsaW5nIGxpc3QKZG0tZGV2ZWxAcmVkaGF0LmNvbQpodHRwczovL2xpc3Rt YW4ucmVkaGF0LmNvbS9tYWlsbWFuL2xpc3RpbmZvL2RtLWRldmVs