[ofa-general][PATCH] Re: mlx4: Completion EQ per cpu (MP support, Patch 10)

[Roland Dreier]

 > We can add the multiple interrupt vectors support in two stages:
 > 1. The low level driver can create multiple interrupt vectors. Their name would include a
 > serial number from 0 to #CPU's-1. The number of completion vectors can
 > be populated through ib_device.num_comp_vectors. Then each ulp can ask for a specific
 > completion vector when creating CQ, which means that passing vector=0 while creating CQ
 > will assign it to completion vector #0.
 > 
 > 2. As the second stage, we can create a "don't care" value which would mean that the driver can
 > can attach the CQ to any completion vector. In this case the policy shouldn't necessary be
 > round-robin. We can manage the number of "clients" for each completion vector and then assign the CQ
 > to the least busy one.

this makes sense.  However I think we need to come up with some
mechanism where a ULP or application can assign some semantic value to
the CQ event vector it chooses.  Maybe a new verb is required.

 - R.