linux-kernel - Re: [dm-devel] [PATCH v4 00/10] Add Copy offload support

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Date:   Thu, 28 Apr 2022 20:39:31 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Nitesh Shetty <nj.shetty@...sung.com>
Cc:     linux-scsi@...r.kernel.org, nitheshshetty@...il.com,
        linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-block@...r.kernel.org, dm-devel@...hat.com,
        linux-fsdevel@...r.kernel.org
Subject: Re: [dm-devel] [PATCH v4 00/10] Add Copy offload support

On 4/28/22 14:37, Damien Le Moal wrote:
> On 4/28/22 16:49, Nitesh Shetty wrote:
>> On Thu, Apr 28, 2022 at 07:05:32AM +0900, Damien Le Moal wrote:
>>> On 4/27/22 21:49, Nitesh Shetty wrote:
>>>> O Wed, Apr 27, 2022 at 11:19:48AM +0900, Damien Le Moal wrote:
>>>>> On 4/26/22 19:12, Nitesh Shetty wrote:
>>>>>> The patch series covers the points discussed in November 2021 virtual call
>>>>>> [LSF/MM/BFP TOPIC] Storage: Copy Offload[0].
>>>>>> We have covered the Initial agreed requirements in this patchset.
>>>>>> Patchset borrows Mikulas's token based approach for 2 bdev
>>>>>> implementation.
>>>>>>
>>>>>> Overall series supports –
>>>>>>
>>>>>> 1. Driver
>>>>>> - NVMe Copy command (single NS), including support in nvme-target (for
>>>>>>      block and file backend)
>>>>>
>>>>> It would also be nice to have copy offload emulation in null_blk for testing.
>>>>>
>>>>
>>>> We can plan this in next phase of copy support, once this series settles down.
>>>
>>> So how can people test your series ? Not a lot of drives out there with
>>> copy support.
>>>
>>
>> Yeah not many drives at present, Qemu can be used to test NVMe copy.
> 
> Upstream QEMU ? What is the command line options ? An example would be
> nice. But I still think null_blk support would be easiest.

+1 for adding copy offloading support in null_blk. That enables running 
copy offloading tests without depending on Qemu.

Thanks,

Bart.