RE: MSI override changes in mptbase

RE: MSI override changes in mptbase

[Jan Beulich]

>>> "Desai, Kashyap" <Kashyap.Desai@lsi.com> 10.03.09 13:12 >>>
>Default behavior for all 3 buses (FC, SPI, and SAS) with respect to MSI is OFF. It is up to user, whether they want to enable/disable >MSI.

Why is that change in behavior for SAS needed then?

Thanks, Jan

RE: MSI override changes in mptbase

[Desai, Kashyap]

Jan,

Best approach is to enable/disable MSI Interrupt on the fly. We are not supporting that feature currently. Something like setting DMA mask through probe code, we should enable/disable MSI interrupt through init code.
Eventually, If MSI enable/disable is not on the fly, it will be always better to keep in default disable in module para of driver.

- Kashyap

-----Original Message-----
From: Jan Beulich [mailto:jbeulich@novell.com] 
Sent: Tuesday, March 10, 2009 7:12 PM
To: Desai, Kashyap
Cc: James.Bottomley@HansenPartnership.com; yinghai@kernel.org; linux-scsi@vger.kernel.org
Subject: RE: MSI override changes in mptbase

>>> "Desai, Kashyap" <Kashyap.Desai@lsi.com> 10.03.09 13:12 >>>
>Default behavior for all 3 buses (FC, SPI, and SAS) with respect to MSI is OFF. It is up to user, whether they want to enable/disable >MSI.

Why is that change in behavior for SAS needed then?

Thanks, Jan


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