jme_dmamap_cb
static void jme_dmamap_cb(void *, bus_dma_segment_t *, int, int);
JME_TX_RING_SIZE, jme_dmamap_cb, &ctx, BUS_DMA_NOWAIT);
JME_RX_RING_SIZE, jme_dmamap_cb, &ctx, BUS_DMA_NOWAIT);
JME_SSB_SIZE, jme_dmamap_cb, &ctx, BUS_DMA_NOWAIT);