From: Max Gurtovoy <maxg@mellanox.com>
To: Christoph Hellwig <hch@lst.de>
Cc: axboe@kernel.dk, jsmart2021@gmail.com, sagi@grimberg.me,
martin.petersen@oracle.com, shlomin@mellanox.com,
israelr@mellanox.com, vladimirk@mellanox.com,
linux-nvme@lists.infradead.org, idanb@mellanox.com,
oren@mellanox.com, kbusch@kernel.org, nitzanc@mellanox.com
Subject: Re: [PATCH 15/15] nvmet-rdma: add metadata/T10-PI support
Date: Mon, 4 May 2020 17:19:21 +0300 [thread overview]
Message-ID: <e5347efd-a0d3-1cd8-a495-dd5e31ef8c42@mellanox.com> (raw)
In-Reply-To: <20200504140800.GA22747@lst.de>
On 5/4/2020 5:08 PM, Christoph Hellwig wrote:
> On Sun, May 03, 2020 at 07:29:12PM +0300, Max Gurtovoy wrote:
>>> Can we have a helper for metadata len that also uses
>>> IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) to let the compiler garbage collect
>>> the whole code if it is compiled out?
>> We have it in:
>>
>> static inline u32 nvmet_rw_metadata_len(struct nvmet_req *req)
>> {
>> if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY))
>> return 0;
>> return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) *
>> req->ns->metadata_size;
>> }
>>
>>
>> and
>>
>> req->metadata_len = nvmet_rw_metadata_len(req);
>>
>> is it good enough for the compiler ?
> Well, this is the calculated metadata len, not the field in the
> request, and the compiler can't really know it always is 0 in that
> case. At some point these optimizations might become a little
> too ugly, though.
Yes, I tried to make some balance between optimization and code
readability and I'll sent V7 today.
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next prev parent reply other threads:[~2020-05-04 14:19 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-28 13:11 [PATCH 00/15 V6] nvme-rdma/nvmet-rdma: Add metadata/T10-PI support Max Gurtovoy
2020-04-28 13:11 ` [PATCH 01/15] nvme: introduce namespace features flag Max Gurtovoy
2020-05-01 13:20 ` Christoph Hellwig
2020-05-01 14:24 ` Christoph Hellwig
2020-05-01 14:33 ` Max Gurtovoy
2020-04-28 13:11 ` [PATCH 02/15] nvme: introduce NVME_NS_METADATA_SUPPORTED flag Max Gurtovoy
2020-05-01 13:20 ` Christoph Hellwig
2020-04-28 13:11 ` [PATCH 03/15] nvme: make nvme_ns_has_pi accessible to transports Max Gurtovoy
2020-05-01 13:20 ` Christoph Hellwig
2020-04-28 13:11 ` [PATCH 04/15] nvme: enforce extended LBA format for fabrics metadata Max Gurtovoy
2020-05-01 13:21 ` Christoph Hellwig
2020-05-01 13:41 ` Christoph Hellwig
2020-04-28 13:11 ` [PATCH 05/15] nvme: introduce max_integrity_segments ctrl attribute Max Gurtovoy
2020-04-28 13:11 ` [PATCH 06/15] nvme: introduce NVME_INLINE_MD_SG_CNT Max Gurtovoy
2020-04-28 13:11 ` [PATCH 07/15] nvme-rdma: introduce nvme_rdma_sgl structure Max Gurtovoy
2020-04-28 13:11 ` [PATCH 08/15] nvme-rdma: add metadata/T10-PI support Max Gurtovoy
2020-05-01 14:26 ` Christoph Hellwig
2020-05-01 15:00 ` Max Gurtovoy
2020-04-28 13:11 ` [PATCH 09/15] nvmet: add metadata characteristics for a namespace Max Gurtovoy
2020-05-01 15:50 ` Christoph Hellwig
2020-04-28 13:11 ` [PATCH 10/15] nvmet: rename nvmet_rw_len to nvmet_rw_data_len Max Gurtovoy
2020-04-28 13:11 ` [PATCH 11/15] nvmet: rename nvmet_check_data_len to nvmet_check_transfer_len Max Gurtovoy
2020-04-28 13:11 ` [PATCH 12/15] nvme: add Metadata Capabilities enumerations Max Gurtovoy
2020-05-01 15:53 ` Christoph Hellwig
2020-05-03 12:43 ` Max Gurtovoy
2020-04-28 13:11 ` [PATCH 13/15] nvmet: add metadata/T10-PI support Max Gurtovoy
2020-05-01 15:58 ` Christoph Hellwig
2020-05-01 16:19 ` Christoph Hellwig
2020-04-28 13:11 ` [PATCH 14/15] nvmet: add metadata support for block devices Max Gurtovoy
2020-05-01 16:25 ` Christoph Hellwig
2020-04-28 13:11 ` [PATCH 15/15] nvmet-rdma: add metadata/T10-PI support Max Gurtovoy
2020-05-01 16:48 ` Christoph Hellwig
2020-05-03 16:29 ` Max Gurtovoy
2020-05-04 14:08 ` Christoph Hellwig
2020-05-04 14:19 ` Max Gurtovoy [this message]
-- strict thread matches above, loose matches on Subject: below --
2020-01-06 13:37 [PATCH 00/15 V3] nvme-rdma/nvmet-rdma: Add " Max Gurtovoy
2020-01-06 13:37 ` [PATCH 15/15] nvmet-rdma: " Max Gurtovoy
2020-01-09 3:29 ` Martin K. Petersen
2019-11-05 16:20 [PATCH 00/15] nvme-rdma/nvmet-rdma: " Max Gurtovoy
2019-11-05 16:20 ` [PATCH 15/15] nvmet-rdma: " 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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