linux-kernel - Re: [PATCH v4 01/10] block: Introduce queue limits for copy-offload support

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Message-ID: <96acbc76-1de8-4be0-314c-4a6a9284c5a3@suse.de>
Date:   Wed, 27 Apr 2022 12:30:56 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Nitesh Shetty <nj.shetty@...sung.com>
Cc:     chaitanyak@...dia.com, linux-block@...r.kernel.org,
        linux-scsi@...r.kernel.org, dm-devel@...hat.com,
        linux-nvme@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        axboe@...nel.dk, msnitzer@...hat.com, bvanassche@....org,
        martin.petersen@...cle.com, kbusch@...nel.org, hch@....de,
        Frederick.Knight@...app.com, osandov@...com,
        lsf-pc@...ts.linux-foundation.org, djwong@...nel.org,
        josef@...icpanda.com, clm@...com, dsterba@...e.com, tytso@....edu,
        jack@...e.com, nitheshshetty@...il.com, gost.dev@...sung.com,
        Kanchan Joshi <joshi.k@...sung.com>,
        Arnav Dawn <arnav.dawn@...sung.com>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...nel.org>,
        Sagi Grimberg <sagi@...mberg.me>,
        James Smart <james.smart@...adcom.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Naohiro Aota <naohiro.aota@....com>,
        Johannes Thumshirn <jth@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 01/10] block: Introduce queue limits for copy-offload
 support

On 4/26/22 12:12, Nitesh Shetty wrote:
> Add device limits as sysfs entries,
>          - copy_offload (RW)
>          - copy_max_bytes (RW)
>          - copy_max_hw_bytes (RO)
>          - copy_max_range_bytes (RW)
>          - copy_max_range_hw_bytes (RO)
>          - copy_max_nr_ranges (RW)
>          - copy_max_nr_ranges_hw (RO)
> 
> Above limits help to split the copy payload in block layer.
> copy_offload, used for setting copy offload(1) or emulation(0).
> copy_max_bytes: maximum total length of copy in single payload.
> copy_max_range_bytes: maximum length in a single entry.
> copy_max_nr_ranges: maximum number of entries in a payload.
> copy_max_*_hw_*: Reflects the device supported maximum limits.
> 
> Signed-off-by: Nitesh Shetty <nj.shetty@...sung.com>
> Signed-off-by: Kanchan Joshi <joshi.k@...sung.com>
> Signed-off-by: Arnav Dawn <arnav.dawn@...sung.com>
> ---
>   Documentation/ABI/stable/sysfs-block |  83 ++++++++++++++++
>   block/blk-settings.c                 |  59 ++++++++++++
>   block/blk-sysfs.c                    | 138 +++++++++++++++++++++++++++
>   include/linux/blkdev.h               |  13 +++
>   4 files changed, 293 insertions(+)
> 

Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		           Kernel Storage Architect
hare@...e.de			                  +49 911 74053 688
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