Alexander Motin 08826086fe Add initial support for multiple MSI-X vectors.
For 24xx and above use 2 vectors (default and response queue).
For 26xx and above use 3 vectors (default, response and ATIO queues).
Due to global lock interrupt hardlers never run simultaneously now, but
at least this allows to save one regitster read per interrupt.

MFC after:	2 weeks
2017-03-19 19:11:40 +00:00
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