[PATCH v8 7/8] nvme: sysfs: emit the marginal path state in show_state()

[John Meneghini]

On 7/9/25 6:12 PM, Keith Busch wrote:
> On Wed, Jul 09, 2025 at 05:19:18PM -0400, Bryan Gurney wrote:
>> If a controller has received a link integrity or congestion event, and
>> has the NVME_CTRL_MARGINAL flag set, emit "marginal" in the state
>> instead of "live", to identify the marginal paths.
> 
> IMO, this attribute looks more aligned to report in the ana_state
> instead of overriding the controller's state.
> 

We can't really do this because the ANA state is a documented protocol state.

The linux controller state is purely a linux software defined state.  Unless I am wrong, there is nothing in the NVMe specification which defines the nvme_ctrl_state.

This is purely a linux definition and we should be able to change is any way we want.

We debated adding a new NVME_CTRL_MARGINAL state to this data structure,

enum nvme_ctrl_state {
         NVME_CTRL_NEW,
         NVME_CTRL_LIVE,
         NVME_CTRL_RESETTING,
         NVME_CTRL_CONNECTING,
         NVME_CTRL_DELETING,
         NVME_CTRL_DELETING_NOIO,
         NVME_CTRL_DEAD,
};

If you don't like the flag we can do that. However, that doesn't seem worth the effort since Hannes has this working now with a flag.

/John