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

From: Bart Van Assche
Date: Thu Apr 28 2022 - 23:39:44 EST

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

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.