net/mlx4: Use effective interrupt affinity

Using the interrupt affinity mask for checking locality is not really
working well on architectures which support effective affinity masks.

The affinity mask is either the system wide default or set by user space,
but the architecture can or even must reduce the mask to the effective set,
which means that checking the affinity mask itself does not really tell
about the actual target CPUs.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20201210194044.672935978@linutronix.de

drivers/net/ethernet/mellanox/mlx4/en_cq.c

@@ -117,7 +117,7 @@ int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
 			assigned_eq = true;
 		}
 		irq = mlx4_eq_get_irq(mdev->dev, cq->vector);
-		cq->aff_mask = irq_get_affinity_mask(irq);
+		cq->aff_mask = irq_get_effective_affinity_mask(irq);
 	} else {
 		/* For TX we use the same irq per
 		ring we assigned for the RX    */