[nvmewin] Quarterly Status meeting

Sun Nov 24 08:03:59 PST 2013

Forgot to mention the following bug:

NVMeInitAdminQueues(pAE)returns TRUE/FALSE. However, callers of that routine are checking for return value of STOR_STATUS_SUCCESS. The function should be changed to "return (Status)" in several places.

Thanks,

Judy

_____________________________________________
From: Judy Brock-SSI
Sent: Sunday, November 24, 2013 6:54 AM
To: 'Kwok Kong'; nvmewin at lists.openfabrics.org
Subject: RE: [nvmewin] Quarterly Status meeting

Kwok,

Here are some additional items to add to the agenda:

1.      BUILDIO  -
a.      there are some IOCTLs which wind up launching actual IO from the BuildIo context. This should never happen - they need to stage for the IO op and then launch their state machines in StartIo.

2.      MIGRATE to VS2013/WDK 8.1
a.      Microsoft came out with VS2013/WDK 8.1 many months ago at this point.
b.      Migrating to  the VS2013/WDK 8.1 platform will allow us to take advantage of StorPortGetProcessorIndexFromNumber(). This API makes fixing enumeration/organization of core table array (and subsequent runtime lookups) much easier.

3.      NVM FMT CMD -
a.      In addition to needing to enhance the NVM Format state machine -already an agenda item - (to quiesce all outstanding IO before initiating the format/reject new reqs  while cmd is in progress, etc)  there are also bugs in the logic when the Global Identifier is used (I don't remember what they are, I just remember running into them around the time of 1st plugfest)

4.      PRP LIST BUILDING -
a.      Function NVMePreparePRPs() never fleshes out the PRP List for NVMe commands that need more than 2 PRP entries. So for ex, if a Vendor Specific command is sent via private IOCTL and the 2nd PRP entry is  a pointer to a PRP list, the list is never built at all. The routine needs to be expanded to handle more than 2 PRP entries.

5.      PARAMLISTLENGTH -
a.      In SntiTranslateWriteBuffer (and maybe other routines, need to look again), "dword10 |= paramListLength;"  should be changed to "dword10 |= paramListLength / NUM_BYTES_IN_DWORDS;" where NUM_BYTES_IN_DWORDS == 4

6.      ORPHANED REQUESTS -
a.      FormatNVMFailure()  still leaving orphaned requests outstanding if it encounters an error. This will cause an application that sent the request to hang waiting for a completion that will never come. I sent a proposed patch to the reflector many months ago on the subject.

7.      FreeQList ACCESSES -
a.         In the StartIo path, protect manipulation of SQI->FreeQList in ProcessIo from manipulation of the same list in IoCompletion DPC. Recommend taking DPC lock to do so. (It's possible that adding group-awareness to core table array will eliminate observation of simultaneous threads of execution in both code paths - needs more investigation).

Thanks,
Judy

-----Original Appointment-----
From: Kwok Kong [mailto:Kwok.Kong at pmcs.com]
Sent: Friday, November 15, 2013 4:03 PM
To: nvmewin at lists.openfabrics.org<mailto:nvmewin at lists.openfabrics.org>
Subject: [nvmewin] Quarterly Status meeting
When: Monday, November 25, 2013 1:00 PM-2:00 PM (UTC-08:00) Pacific Time (US & Canada).
Where: Live Meeting

Agenda:

*       Review 1.3 release plan
*       Windows 32-bit support
*       Windows 8 extended SRB support
*       NVM format state machine enhancement
*       End to end protection support
*       Hibernation
*       Known issues
*       - Not handling CSTS.RDY status (from 1->0 and 0->1) properly on NVMe reset. (Judy - Samsung)
*       NUMA group support in core enumeration
*       Controller reset does not handle all cases
*       Learning of CPU core to Vector failure handling
*       Core-MSI vector queue mapping issues

*       Discuss plan for 2014

*       Features that will not be supported in 2013
*       ===========================================
*
*       NVMe 1.1 support:
*       - multi-path
*       - SGL
*       - Get/Set feature update
*               - Autonomous power state transition
*               - Host Identifier
*               - Reservation Notification Mask
*               - Reservation Persistence
*       - identify structure update
*       - write zeros command
*
Next Meeting

Please let me know if you would like to add any items to the agenda.

-Kwok

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