[ofa-general] [PATCH 1 of 3] IB/verbs: add cq comp_vector support in core

[Hoang-Nam Nguyen]

Hello Michael and Roland!
How about a new verb delivering number of cqs associated with a
comp_vector like this

/**
 * Returns number of cqs assigned to comp_vector
 * @return < 0 in error case eg invalid comp_vector
 */
int ib_query_comp_vector(struct ib_device *dev, int comp_vector);

A consumer or ULP would be able to pick an "empty" comp_vector.
Surely that does not prevent that a certain comp_vector resp. IRQ
can be "overloaded", and that's another topic.
Thanks
Nam
PS: I'm waiting for your comments first, a patch will come later.