Index: if_igb.h
===================================================================
--- if_igb.h
+++ if_igb.h
@@ -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_IP_TCP|CSUM_IP_UDP|CSUM_IP_SCTP)
+#define CSUM_OFFLOAD_IPV6       (CSUM_IP6_TCP|CSUM_IP6_UDP|CSUM_IP6_SCTP)
+#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)
Index: if_igb.c
===================================================================
--- if_igb.c
+++ if_igb.c
@@ -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;
@@ -1266,14 +1283,26 @@
 	/* Set hardware offload abilities */
 	ifp->if_hwassist = 0;
 	if (ifp->if_capenable & IFCAP_TXCSUM) {
+#if __FreeBSD_version >= 1000000
+		ifp->if_hwassist |= (CSUM_IP_TCP | CSUM_IP_UDP);
+		if (adapter->hw.mac.type != e1000_82575)
+			ifp->if_hwassist |= CSUM_IP_SCTP;
+#else
 		ifp->if_hwassist |= (CSUM_TCP | CSUM_UDP);
 #if __FreeBSD_version >= 800000
-		if ((adapter->hw.mac.type == e1000_82576) ||
-		    (adapter->hw.mac.type == e1000_82580))
+		if (adapter->hw.mac.type != e1000_82575)
 			ifp->if_hwassist |= CSUM_SCTP;
 #endif
+#endif
 	}
 
+#if __FreeBSD_version >= 1000000
+	if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) {
+		ifp->if_hwassist |= (CSUM_IP6_TCP | CSUM_IP6_UDP);
+		if (adapter->hw.mac.type != e1000_82575)
+			ifp->if_hwassist |= CSUM_IP6_SCTP;
+	}
+#endif
 	if (ifp->if_capenable & IFCAP_TSO)
 		ifp->if_hwassist |= CSUM_TSO;
 
@@ -3160,6 +3189,9 @@
 	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;
@@ -3933,17 +3965,29 @@
 
 	switch (ipproto) {
 		case IPPROTO_TCP:
+#if __FreeBSD_version >= 1000000
+			if (mp->m_pkthdr.csum_flags & (CSUM_IP_TCP | CSUM_IP6_TCP))
+#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_IP_UDP | CSUM_IP6_UDP))
+#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_IP_SCTP | CSUM_IP6_SCTP))
+#else
 			if (mp->m_pkthdr.csum_flags & CSUM_SCTP)
+#endif
 				type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_L4T_SCTP;
 			break;
 #endif
@@ -4701,8 +4745,7 @@
 		rxcsum |= E1000_RXCSUM_PCSD;
 #if __FreeBSD_version >= 800000
 		/* For SCTP Offload */
-		if (((hw->mac.type == e1000_82576) ||
-		     (hw->mac.type == e1000_82580)) &&
+		if ((hw->mac.type != e1000_82575) &&
 		    (ifp->if_capenable & IFCAP_RXCSUM))
 			rxcsum |= E1000_RXCSUM_CRCOFL;
 #endif
@@ -4711,8 +4754,7 @@
 		if (ifp->if_capenable & IFCAP_RXCSUM) {
 			rxcsum |= E1000_RXCSUM_IPPCSE;
 #if __FreeBSD_version >= 800000
-			if ((adapter->hw.mac.type == e1000_82576) ||
-			    (adapter->hw.mac.type == e1000_82580))
+			if (adapter->hw.mac.type != e1000_82575)
 				rxcsum |= E1000_RXCSUM_CRCOFL;
 #endif
 		} else