How to understand StorPortGetStartIoPerfParams

Question

Use WDK10, target env: windows server2019

My scsi adapter support MSI-X, and finished all concurrent I/O initiation for miniport:

1. Full-duplex
2. Call StorPortInitializePerfOpts with STOR_PERF_DPC_REDIRECTION/STOR_PERF_CONCURRENT_CHANNELS flag
3. INF: MSI-X DevicePolicy IrqPolicySpreadMessagesAcrossAllProcessors

Under the concurrent configuration, Is it correct for the follow expectation ?

During HwStartIO , StorPortGetStartIoPerfParams
STARTIO_PERFORMANCE_PARAMETERS.MessageNumber: MSI-X message number to signal completion for this I/O
STARTIO_PERFORMANCE_PARAMETERS.ChannelNumber: unique zero-based channel identifier guaranteed not to be reused until the current I/O completes

https://www.slideserve.com/chi/numa-i

Answer 1

Hi there,

The STARTIO_PERFORMANCE_PARAMETERS structure describes the performance parameters that are returned to the Miniport driver by the StorPortGetStartIoPerfParams routine.

Here are some links to help you out

StorPortGetStartIoPerfParams function (storport.h)
https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/storport/nf-storport-storportgetstartioperfparams

STARTIO_PERFORMANCE_PARAMETERS structure (storport.h)
https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/storport/ns-storport-_startio_performance_parameters

-----------------------------------------------------------------------------------------------------------------------------

--If the reply is helpful, please Upvote and Accept it as an answer--