[PATCH blktests] nvme/075: test the per-queue io_cpu sysfs attribute

[Shin'ichiro Kawasaki]

On Oct 23, 2026 / 16:08, Saravanan D wrote:
> nvme-tcp exposes /sys/class/nvme/nvmeX/queues/<qid>/io_cpu and managed,
> so a control plane can choose the CPU that runs each I/O queue's socket
> work [1]. Test that
> 
>   - io_cpu reads back a written CPU and rejects invalid values
>   - managed is read only and turns 0 once io_cpu is written
>   - an assignment survives a controller reset
>   - the queue directories follow the queue count as attr_qid_max
>     shrinks and grows it
>   - removing the controller while io_cpu is written completes
> 
> The test skips when the kernel does not have the attribute.
> 
> [1] https://lore.kernel.org/linux-nvme/20261018010059.83120-1-saravanand@crusoe.ai/
> 
> Assisted-by: Claude:claude-opus-5-5 [Claude Code]
> Signed-off-by: Saravanan D <saravanand at crusoe.ai>
> ---
> This tests the kernel series in the parent thread, which is under
> review on linux-nvme.

Thanks for the patch. The patch content looks good to me. I applied the kernel
series [1] on top of the current Linus master branch, and confirmed this new
test case passes. Good.

I'll wait for the kernel series get settled. I expect the kernel series will be
revised a few more times, and this blktests patch will need to adjust to it,
probably.