Navdeep Parhar a91fea93ad Do not over-allocate MSI interrupts for the case where each ingress
queue has its own interrupt.  If the exact number that we need is not a
power of 2 and we're using MSI, then switch to interrupt multiplexing.

While here, replace the magic numbers with something more readable.

MFC after:	3 days
2011-03-24 01:03:01 +00:00
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