Red Hat Bugzilla – Bug 475717
[LTC 5.4 FEAT] Enhance the ipr driver to support MSI-X interrupt 
Last modified: 2009-09-02 04:16:05 EDT
Emily J. Ratliff <email@example.com> -
1. Feature Overview:
Feature Id: 
a. Name of Feature: Enhance the ipr driver to support MSI-X interrupt
b. Feature Description
The ipr driver needs to enable the MSI or MSI-X interrupt support for all PCI-Express SAS adapters.
2. Feature Details:
Arch Specificity: Purely Common Code
Affects Kernel Modules: Yes
Delivery Mechanism: Device Driver
Category: Device Drivers and IO
Request Type: Driver - Update Version
d. Upstream Acceptance: Not Started
Sponsor Priority 1
f. Severity: High
IBM Confidential: no
Code Contribution: IBM code
g. Component Version Target:
3. Business Case
Enhancing the SAS IO on Power platform
4. Primary contact at Red Hat:
5. Primary contacts at Partner:
Project Management Contact:
Stephanie Glass, firstname.lastname@example.org, 512-838-9284
Daisy Chang, email@example.com
Wayne Boyer, firstname.lastname@example.org
Wendel Voigt, email@example.com
IBM is signed up to test and provide feedback.
The patch has been submitted to linux-scsi here: http://marc.info/?l=linux-scsi&m=123273106605076&w=2
Backport testing is under way.
Created attachment 330050 [details]
Enable MSI for IPR if it is supported
Patch built against IPR version 126.96.36.199 on a RHEL 5.3 system using the 2.6.18-128.el5 kernel source rpm.
tested using 2 PCI-X adapters and 2 PCI-E adapters. PCI-X adapters corrected reported MSI not enabled. PCI-E adapters correctly reported MSI enabled.
With storage connected to the PCI-E adapters in a dual adapter configuration, ran disk stress test on 4 arrays (one each of RAID 0, RAID 10, RAID 5 and RAID 6) and switched the primary adapter. The switch occurred without error and the stress tests continued to run without errors.
Performed a format of a JBOD disk to an advanced function disk with no errors.
Performed 4 iterations of rmmod and insmod of the ipr module. Gave debug=1 for the insmod and observed the correct reporting of MSI enabled or not enabled.
Updating PM score.
This enhancement request was evaluated by the full Red Hat Enterprise Linux
team for inclusion in a Red Hat Enterprise Linux minor release. As a
result of this evaluation, Red Hat has tentatively approved inclusion of
this feature in the next Red Hat Enterprise Linux Update minor release.
While it is a goal to include this enhancement in the next minor release
of Red Hat Enterprise Linux, the enhancement is not yet committed for
inclusion in the next minor release pending the next phase of actual
code integration and successful Red Hat and partner testing.
Created attachment 339351 [details]
patch built for RHEL 5.4
------- Comment on attachment From firstname.lastname@example.org 2009-04-13 14:36 EDT-------
Attaching an updated patch for RHEL 5.4. The original patch did not have the correct paths and did not apply cleanly.
Please note that code HAS NOT been changed. This is simply an update to the format of the patch.
The patch given to you via RKML already had the path fixes and had passed brew build. This message was meant for the IBM side. Therefore, please ignore comment #8. Thanks.
You can download this test kernel from http://people.redhat.com/dzickus/el5
Please do NOT transition this bugzilla state to VERIFIED until our QE team
has sent specific instructions indicating when to do so. However feel free
to provide a comment indicating that this fix has been verified.
~~ Attention Partners RHEL 5.4 Partner Alpha Released! ~~
RHEL 5.4 Partner Alpha has been released on partners.redhat.com. There should
be a fix present that addresses this particular request. Please test and report back your results here, at your earliest convenience. Our Public Beta release is just around the corner!
If you encounter any issues, please set the bug back to the ASSIGNED state and
describe the issues you encountered. If you have verified the request functions as expected, please set your Partner ID in the Partner field above to indicate successful test results. Do not flip the bug status to VERIFIED. Further questions can be directed to your Red Hat Partner Manager. Thanks!
~~ Attention - RHEL 5.4 Beta Released! ~~
RHEL 5.4 Beta has been released! There should be a fix present in the Beta release that addresses this particular request. Please test and report back results here, at your earliest convenience. RHEL 5.4 General Availability release is just around the corner!
If you encounter any issues while testing Beta, please describe the issues you have encountered and set the bug into NEED_INFO. If you encounter new issues, please clone this bug to open a new issue and request it be reviewed for inclusion in RHEL 5.4 or a later update, if it is not of urgent severity.
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Questions can be posted to this bug or your customer or partner representative.
------- Comment From email@example.com 2009-07-06 22:54 EDT-------
I have loaded the beta release and verified that the MSI support is included for the IPR driver.
PCI: Enabling device: (0002:01:00.0), cmd 142
ipr 0002:01:00.0: MSI enabled
ipr 0002:01:00.0: Found IOA with IRQ: 53
ipr 0002:01:00.0: Starting IOA initialization sequence.
ipr 0002:01:00.0: Adapter firmware version: 0322004F
ipr 0002:01:00.0: IOA initialized.
scsi3 : IBM 57BA Storage Adapter
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.