[PATCH 3/3] nvme: add 'kato' sysfs attribute

[Max Gurtovoy]

On 3/2/2021 11:26 AM, Hannes Reinecke wrote:
> Add a 'kato' controller sysfs attribute to display the current
> keep-alive timeout value (if any). This allows userspace to identify
> persistent discovery controllers, as these will have a non-zero
> KATO value.

I'm not sure it will identify the persistent discovery controller since 
you might have non-zero KATO for regular controllers as well.

But for identification you can set special MN or SN for these controllers.

The patch is useful for displaying the keep-alive timeout value.