diff --git a/sys/dev/dwc/dwc1000_dma.c b/sys/dev/dwc/dwc1000_dma.c
--- a/sys/dev/dwc/dwc1000_dma.c
+++ b/sys/dev/dwc/dwc1000_dma.c
@@ -248,7 +248,7 @@
 	struct bus_dma_segment segs[TX_MAP_MAX_SEGS];
 	int error, nsegs;
 	struct mbuf * m;
-	uint32_t flags = 0;
+	uint32_t flags;
 	int i;
 	int last;
 
@@ -276,19 +276,12 @@
 
 	m = *mp;
 
-	if ((m->m_pkthdr.csum_flags & CSUM_IP) != 0) {
-		if ((m->m_pkthdr.csum_flags & (CSUM_TCP|CSUM_UDP)) != 0) {
-			if (!sc->dma_ext_desc)
-				flags = NTDESC1_CIC_FULL;
-			else
-				flags = ETDESC0_CIC_FULL;
-		} else {
-			if (!sc->dma_ext_desc)
-				flags = NTDESC1_CIC_HDR;
-			else
-				flags = ETDESC0_CIC_HDR;
-		}
-	}
+	if ((m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) != 0)
+		flags = sc->dma_ext_desc ? ETDESC0_CIC_SEG : NTDESC1_CIC_SEG;
+	else if ((m->m_pkthdr.csum_flags & CSUM_IP) != 0)
+		flags = sc->dma_ext_desc ? ETDESC0_CIC_HDR : NTDESC1_CIC_HDR;
+	else
+		flags = sc->dma_ext_desc ? ETDESC0_CIC_NONE : NTDESC1_CIC_NONE;
 
 	bus_dmamap_sync(sc->txbuf_tag, sc->txbuf_map[idx].map,
 	    BUS_DMASYNC_PREWRITE);