vnic_counter_counts
struct vnic_counter_counts *flow_counters;
iflib_dma_alloc(softc->ctx, sizeof(struct vnic_counter_counts) * VNIC_MAX_FLOW_COUNTERS, &vdev->flow_counters_res, 0);
vdev->flow_counters = (struct vnic_counter_counts *)vdev->flow_counters_res.idi_vaddr;