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Sat, 10 Apr 2021 00:30:00 +0000 From: Chaitanya Kulkarni To: Max Gurtovoy , SelvaKumar S , "linux-nvme@lists.infradead.org" CC: "axboe@kernel.dk" , Damien Le Moal , "kch@kernel.org" , "sagi@grimberg.me" , "snitzer@redhat.com" , "selvajove@gmail.com" , "linux-kernel@vger.kernel.org" , "nj.shetty@samsung.com" , "linux-block@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "dm-devel@redhat.com" , "joshi.k@samsung.com" , "javier.gonz@samsung.com" , "kbusch@kernel.org" , "joshiiitr@gmail.com" , "hch@lst.de" Subject: Re: [RFC PATCH v5 0/4] add simple copy support Thread-Topic: [RFC PATCH v5 0/4] add simple copy support Thread-Index: AQHXByxPYjd3lKFugEyHev6iOAHEsg== Date: Sat, 10 Apr 2021 00:29:59 +0000 Message-ID: References: <20210219124517.79359-1-selvakuma.s1@samsung.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: nvidia.com; dkim=none (message not signed) header.d=none;nvidia.com; dmarc=none action=none header.from=wdc.com; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On 4/9/21 17:22, Max Gurtovoy wrote: > On 2/19/2021 2:45 PM, SelvaKumar S wrote: >> This patchset tries to add support for TP4065a ("Simple Copy Command"), >> v2020.05.04 ("Ratified") >> >> The Specification can be found in following link. >> https://nvmexpress.org/wp-content/uploads/NVM-Express-1.4-Ratified-TPs-1.zip >> >> Simple copy command is a copy offloading operation and is used to copy >> multiple contiguous ranges (source_ranges) of LBA's to a single destination >> LBA within the device reducing traffic between host and device. >> >> This implementation doesn't add native copy offload support for stacked >> devices rather copy offload is done through emulation. Possible use >> cases are F2FS gc and BTRFS relocation/balance. >> >> *blkdev_issue_copy* takes source bdev, no of sources, array of source >> ranges (in sectors), destination bdev and destination offset(in sectors). >> If both source and destination block devices are same and copy_offload = 1, >> then copy is done through native copy offloading. Copy emulation is used >> in other cases. >> >> As SCSI XCOPY can take two different block devices and no of source range is >> equal to 1, this interface can be extended in future to support SCSI XCOPY. > Any idea why this TP wasn't designed for copy offload between 2 > different namespaces in the same controller ? Yes, it was the first attempt so to keep it simple. Further work is needed to add incremental TP so that we can also do a copy between the name-spaces of same controller (if we can't already) and to the namespaces that belongs to the different controller. > And a simple copy will be the case where the src_nsid == dst_nsid ? > > Also why there are multiple source ranges and only one dst range ? We > could add a bit to indicate if this range is src or dst.. > > _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme