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
@@ -276,7 +276,7 @@
 
 	m = *mp;
 
-	if ((m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) != 0)
+	if ((m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) != 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;
diff --git a/sys/dev/dwc/if_dwc.c b/sys/dev/dwc/if_dwc.c
--- a/sys/dev/dwc/if_dwc.c
+++ b/sys/dev/dwc/if_dwc.c
@@ -271,6 +271,12 @@
 			if_sethwassistbits(ifp, CSUM_IP | CSUM_DELAY_DATA, 0);
 		else
 			if_sethwassistbits(ifp, 0, CSUM_IP | CSUM_DELAY_DATA);
+		if (mask & IFCAP_TXCSUM_IPV6)
+			if_togglecapenable(ifp, IFCAP_TXCSUM_IPV6);
+		if ((if_getcapenable(ifp) & IFCAP_TXCSUM_IPV6) != 0)
+			if_sethwassistbits(ifp, CSUM_DELAY_DATA_IPV6, 0);
+		else
+			if_sethwassistbits(ifp, 0, CSUM_DELAY_DATA_IPV6);
 
 		if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) {
 			DWC_LOCK(sc);
@@ -607,8 +613,8 @@
 	if_setinitfn(ifp, dwc_init);
 	if_setsendqlen(ifp, TX_MAP_COUNT - 1);
 	if_setsendqready(sc->ifp);
-	if_sethwassist(sc->ifp, CSUM_IP | CSUM_DELAY_DATA);
-	if_setcapabilities(sc->ifp, IFCAP_VLAN_MTU | IFCAP_HWCSUM);
+	if_sethwassist(sc->ifp, CSUM_IP | CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6);
+	if_setcapabilities(sc->ifp, IFCAP_VLAN_MTU | IFCAP_HWCSUM | IFCAP_TXCSUM_IPV6);
 	if_setcapenable(sc->ifp, if_getcapabilities(sc->ifp));
 
 	/* Attach the mii driver. */