net/mlx5: Round-Robin EQs over IRQs

net/mlx5: Round-Robin EQs over IRQs

Whenever users provided affinity for an EQ creation request, map the
EQ to a matching IRQ.
Matching IRQ=IRQ with the same affinity and type (completion/control) of
the EQ created.

This mapping is being done in agressive dedicated IRQ allocation scheme,
which described bellow.

First, we check whether there is a matching IRQ that his min threshold
is not exhausted.
   - min_eqs_threshold = 3 for control EQ.
   - min_eqs_threshold = 1 for completion EQ.
In case no matching IRQ was found, try to request a new IRQ.
In case we can't request a new IRQ, reuse least-used matching IRQ.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>