age_dmamap_cb
AGE_RX_RING_SZ, age_dmamap_cb, &ctx, 0);
AGE_RR_RING_SZ, age_dmamap_cb,
AGE_CMB_BLOCK_SZ, age_dmamap_cb, &ctx, 0);
AGE_SMB_BLOCK_SZ, age_dmamap_cb, &ctx, 0);
static void age_dmamap_cb(void *, bus_dma_segment_t *, int, int);
AGE_TX_RING_SZ, age_dmamap_cb, &ctx, 0);