> When the vector number passed to mlx4_cq_alloc is MLX4_ANY_VECTOR (0xff),
 > the driver selects the completion vector that has the least CQs attached
 > to it and attaches the CQ to the chosen vector.

Ummm... how could an app/ULP use this sanely?  Have a huge switch
statement to choose MLX4_ANY_VECTOR / EHCA_ANY_VECTOR / FOOHCA_ANY_VECTOR?

We need something generic like IB_CQ_VECTOR_LEAST_ATTACHED that
specifies the policy in a driver-independent way.

 - R.
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