[PATCH 2/2] nvme: add 'queue_if_no_path' semantics

[Christoph Hellwig]

On Tue, Oct 06, 2020 at 10:07:49AM +0200, Hannes Reinecke wrote:
> On 10/6/20 9:51 AM, Christoph Hellwig wrote:
>> On Tue, Oct 06, 2020 at 07:48:40AM +0200, Hannes Reinecke wrote:
>>> Well, because it's established behaviour of the current code.
>>> Changing it now has the potential to break existing scenarios.
>>>
>>> For PCI (ie non-fabrics) the current behaviour is arguably a corner case
>>> (as one needs to have a PCI-NVMe with CMIC bit set), but once you have it
>>> PCI hotplug is done for. So there we really want to change the behaviour to
>>> get the same user experience for all NVMe drives.
>>
>> Dual port PCI NVMe devices are pretty common in the enterprise space.
>> I really don't see any good reason to differ here.
>>
> ?
> Differ from what?
>
> Normal (non-dual ported) PCI-NVMe?
> NVMe-oF?

All multipath devices should behave the same.  No special casing for
PCIe, please.