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From: Max Gurtovoy <maxg@mellanox.com>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: sagi@grimberg.me, vladimirk@mellanox.com, idanb@mellanox.com,
	israelr@mellanox.com, linux-nvme@lists.infradead.org,
	shlomin@mellanox.com, oren@mellanox.com, kbusch@kernel.org,
	hch@lst.de
Subject: Re: [PATCH 06/15] block: Introduce BIP_NOMAP_INTEGRITY bip_flag
Date: Tue, 12 Nov 2019 12:40:58 +0200
Message-ID: <0b535769-6fb1-cb34-9209-9c2c875b7a4b@mellanox.com> (raw)
In-Reply-To: <yq1zhh5vlyl.fsf@oracle.com>


On 11/9/2019 4:10 AM, Martin K. Petersen wrote:
> Max,
>
>> In the fabric solution the Initiator side is the SW controller of the
>> namespace and the target is kinda HW controller.
>>
>> The SW controller is doing the reftag remapping during
>> prepare/complete functions and it should be done only once.
>>
>> The HW controller should write/read the data from the media as is (and
>> maybe verify/add it).
>>
>> When you're using an NVMe disk as the bdev for the target namespace,
>> then prepare/complete will be called also in the "target" side and we
>> don't want double remapping to happen.
> In a typical SCSI setup you'll have remapping several times as the file
> block offset visible to an application is different from the LBA on the
> LUN. And the LUN LBA is different from the LBA of the drive physically
> storing the data block inside the disk array.
>
> To me it sounds like your 1:1 mapping between host LBA and target
> back-end LBA is just a special case. What happens in your scenario if
> the target bdev is a partition and not a full namespace?

We'll add a partition tests to our suite and make sure it works.


>
>> In the complete_fn there is no option to skip the remapping...
> Only because there hasn't been a need. Feel free to add a
> BIP_MAPPED_INTEGRITY check to complete_fn.

Sure.

thanks



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Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-05 16:20 [PATCH 00/15] nvme-rdma/nvmet-rdma: Add metadata/T10-PI support Max Gurtovoy
2019-11-05 16:20 ` [PATCH] nvme-cli/fabrics: Add pi_enable param to connect cmd Max Gurtovoy
2019-11-07  2:36   ` Martin K. Petersen
2019-11-07 12:02     ` Max Gurtovoy
2019-11-09  1:55       ` Martin K. Petersen
2019-11-10  9:25         ` Max Gurtovoy
2019-11-12 17:47           ` Sagi Grimberg
2019-11-12 18:14             ` James Smart
2019-11-12 18:23               ` Sagi Grimberg
2019-11-05 16:20 ` [PATCH 01/15] nvme-fabrics: allow user enabling metadata/T10-PI support Max Gurtovoy
2019-11-12 17:48   ` Sagi Grimberg
2019-11-05 16:20 ` [PATCH 02/15] nvme: Fail __nvme_revalidate_disk in case of a spec violation Max Gurtovoy
2019-11-05 17:49   ` Christoph Hellwig
2019-11-12 17:52     ` Sagi Grimberg
2019-11-05 16:20 ` [PATCH 03/15] nvme: Introduce max_integrity_segments ctrl attribute Max Gurtovoy
2019-11-05 17:49   ` Christoph Hellwig
2019-11-12 17:53   ` Sagi Grimberg
2019-11-05 16:20 ` [PATCH 04/15] nvme: Inline nvme_ns_has_pi function Max Gurtovoy
2019-11-05 17:50   ` Christoph Hellwig
2019-11-05 16:20 ` [PATCH 05/15] nvme-rdma: Add metadata/T10-PI support Max Gurtovoy
2019-11-05 17:58   ` Christoph Hellwig
2019-11-20 10:41     ` Max Gurtovoy
2019-11-12 18:22   ` Sagi Grimberg
2019-11-13 14:35     ` Max Gurtovoy
2019-11-14 23:57       ` Sagi Grimberg
2019-11-05 16:20 ` [PATCH 06/15] block: Introduce BIP_NOMAP_INTEGRITY bip_flag Max Gurtovoy
2019-11-05 17:52   ` Christoph Hellwig
2019-11-07  2:43   ` Martin K. Petersen
2019-11-07 13:29     ` Max Gurtovoy
2019-11-09  2:10       ` Martin K. Petersen
2019-11-12 10:40         ` Max Gurtovoy [this message]
2019-11-05 16:20 ` [PATCH 07/15] nvmet: Prepare metadata request Max Gurtovoy
2019-11-05 16:20 ` [PATCH 08/15] nvmet: Add metadata characteristics for a namespace Max Gurtovoy
2019-11-05 17:59   ` Christoph Hellwig
2019-11-12 18:38     ` Sagi Grimberg
2019-11-05 16:20 ` [PATCH 09/15] nvmet: Rename nvmet_rw_len to nvmet_rw_data_len Max Gurtovoy
2019-11-05 17:59   ` Christoph Hellwig
2019-11-12 18:39   ` Sagi Grimberg
2019-11-05 16:20 ` [PATCH 10/15] nvmet: Rename nvmet_check_data_len to nvmet_check_transfer_len Max Gurtovoy
2019-11-05 18:00   ` Christoph Hellwig
2019-11-12 18:43   ` Sagi Grimberg
2019-11-05 16:20 ` [PATCH 11/15] nvmet: Introduce nvmet_rw_prot_len and nvmet_ns_has_pi Max Gurtovoy
2019-11-05 18:00   ` Christoph Hellwig
2019-11-05 16:20 ` [PATCH 12/15] nvme: Add Metadata Capabilities enumerations Max Gurtovoy
2019-11-05 16:20 ` [PATCH 13/15] nvmet: Add metadata/T10-PI support Max Gurtovoy
2019-11-05 16:20 ` [PATCH 14/15] nvmet: Add metadata support for block devices Max Gurtovoy
2019-11-05 16:20 ` [PATCH 15/15] nvmet-rdma: Add metadata/T10-PI support Max Gurtovoy
2019-11-05 18:02   ` Christoph Hellwig
2019-11-07 13:43     ` Max Gurtovoy
2019-11-12 18:34   ` Sagi Grimberg
2019-11-13 13:56     ` Max Gurtovoy
2019-11-14 23:45       ` Sagi Grimberg

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