RE: [PATCH 5/7] I/OAT: Add support for MSI and MSI-X

[Nelson, Shannon]

Roland Dreier [mailto:rdreier@xxxxxxxxx] 
>
>OK, let's try to avoid going off into the weeds here.  In the context
>of the specific patch that this thread started with, is there any
>point in having both "msix-single-vector" and "msi" interrupt support?

Some versions of this hardware support MSI-X and not MSI.  If it can't
get all the MSI-X interrupts, it will try a single interrupt before
fallign all the way down to Legacy interrupts.  Basically, if we can
only get one interrupt, we'd still like to use the MSI-X mechanics if
possible.  If totally out of the question, then we'll use legacy.

sln
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Mr. Shannon Nelson                 LAN Access Division, Intel Corp.
Shannon.Nelson@xxxxxxxxx                I don't speak for Intel
(503) 712-7659                    Parents can't afford to be squeamish.
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