Index: if_igb.c
===================================================================
--- if_igb.c	(revision 293608)
+++ if_igb.c	(working copy)
@@ -1184,10 +1184,27 @@
 			}
 		}
 #endif
+#if __FreeBSD_version >= 1000000
+		/* HW cannot turn these on/off separately */
+		if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) {
+			ifp->if_capenable ^= IFCAP_RXCSUM;
+			ifp->if_capenable ^= IFCAP_RXCSUM_IPV6;
+			reinit = 1;
+		}
+		if (mask & IFCAP_TXCSUM) {
+			ifp->if_capenable ^= IFCAP_TXCSUM;
+			reinit = 1;
+		}
+		if (mask & IFCAP_TXCSUM_IPV6) {
+			ifp->if_capenable ^= IFCAP_TXCSUM_IPV6;
+			reinit = 1;
+		}
+#else
 		if (mask & IFCAP_HWCSUM) {
 			ifp->if_capenable ^= IFCAP_HWCSUM;
 			reinit = 1;
 		}
+#endif
 		if (mask & IFCAP_TSO4) {
 			ifp->if_capenable ^= IFCAP_TSO4;
 			reinit = 1;
@@ -1274,6 +1291,14 @@
 #endif
 	}
 
+#if __FreeBSD_version >= 1000000
+	if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) {
+		ifp->if_hwassist |= (CSUM_TCP_IPV6 | CSUM_UDP_IPV6);
+		if ((adapter->hw.mac.type == e1000_82576) ||
+		    (adapter->hw.mac.type == e1000_82580))
+			ifp->if_hwassist |= CSUM_SCTP_IPV6;
+	}
+#endif
 	if (ifp->if_capenable & IFCAP_TSO)
 		ifp->if_hwassist |= CSUM_TSO;
 
@@ -3151,6 +3176,9 @@
 	ifp->if_capabilities = ifp->if_capenable = 0;
 
 	ifp->if_capabilities = IFCAP_HWCSUM | IFCAP_VLAN_HWCSUM;
+#if __FreeBSD_version >= 1000000
+	ifp->if_capabilities |= IFCAP_HWCSUM_IPV6;
+#endif
 	ifp->if_capabilities |= IFCAP_TSO;
 	ifp->if_capabilities |= IFCAP_JUMBO_MTU;
 	ifp->if_capenable = ifp->if_capabilities;
@@ -3924,17 +3952,29 @@
 
 	switch (ipproto) {
 		case IPPROTO_TCP:
+#if __FreeBSD_version >= 1000000
+			if (mp->m_pkthdr.csum_flags & (CSUM_TCP | CSUM_TCP_IPV6))
+#else
 			if (mp->m_pkthdr.csum_flags & CSUM_TCP)
+#endif
 				type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_L4T_TCP;
 			break;
 		case IPPROTO_UDP:
+#if __FreeBSD_version >= 1000000
+			if (mp->m_pkthdr.csum_flags & (CSUM_UDP | CSUM_UDP_IPV6))
+#else
 			if (mp->m_pkthdr.csum_flags & CSUM_UDP)
+#endif
 				type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_L4T_UDP;
 			break;
 
 #if __FreeBSD_version >= 800000
 		case IPPROTO_SCTP:
+#if __FreeBSD_version >= 1000000
+			if (mp->m_pkthdr.csum_flags & (CSUM_SCTP | CSUM_SCTP_IPV6))
+#else
 			if (mp->m_pkthdr.csum_flags & CSUM_SCTP)
+#endif
 				type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_L4T_SCTP;
 			break;
 #endif
Index: if_igb.h
===================================================================
--- if_igb.h	(revision 293608)
+++ if_igb.h	(working copy)
@@ -291,7 +291,11 @@
 #define ETH_ADDR_LEN		6
 
 /* Offload bits in mbuf flag */
-#if __FreeBSD_version >= 800000
+#if __FreeBSD_version >= 1000000
+#define CSUM_OFFLOAD_IPV4       (CSUM_IP|CSUM_TCP|CSUM_UDP|CSUM_SCTP)
+#define CSUM_OFFLOAD_IPV6       (CSUM_TCP_IPV6|CSUM_UDP_IPV6|CSUM_SCTP_IPV6)
+#define CSUM_OFFLOAD            (CSUM_OFFLOAD_IPV4|CSUM_OFFLOAD_IPV6)
+#elif __FreeBSD_version >= 800000
 #define CSUM_OFFLOAD		(CSUM_IP|CSUM_TCP|CSUM_UDP|CSUM_SCTP)
 #else
 #define CSUM_OFFLOAD		(CSUM_IP|CSUM_TCP|CSUM_UDP)