[RFC PATCH 4/4] nvme: expose queue information via debugfs

[Nilay Shroff]

On 4/25/26 3:53 AM, Sagi Grimberg wrote:
> 
> 
> On 20/04/2026 14:49, Nilay Shroff wrote:
>> Add a new debugfs attribute "io_queue_info" to expose per-queue
>> information for NVMe controllers. For NVMe-TCP, this includes the
>> CPU handling each I/O queue and the associated TCP flow (source and
>> destination address/port).
>>
>> This information can be useful for understanding and tuning the
>> interaction between NVMe-TCP I/O queues and network stack components,
>> such as IRQ affinity, RPS/RFS, XPS, or NIC flow steering (ntuple).
>>
>> The data is exported using seq_file interfaces to allow iteration
>> over all controller queues.
> 
> Don't really mind having this. Not sure who will actually go through
> the process of mangling RFS/RPS/XPS for based on this 5-tuple, but ok...

Yeah it may not be used always but I think in performance sensitive
workload, user would like to leverage this information for tuning
I/O stack.

Thanks,
--Nilay