ixgbe: enable hardware offload for sctp

Inspired by: Vlad Yasevich <vladislav.yasevich@hp.com>

This is the code to enable ixgbe for hardware offload support
of CRC32c on both transmit and receive of SCTP traffic.

only 82599 supports this offload, not 82598.
Signed-off-by: NJesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ixgbe/ixgbe_ethtool.c

@@ -311,10 +311,17 @@ static u32 ixgbe_get_tx_csum(struct net_device *netdev)
 
 static int ixgbe_set_tx_csum(struct net_device *netdev, u32 data)
 {
-	if (data)
+	struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+	if (data) {
 		netdev->features |= (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
-	else
+		if (adapter->hw.mac.type == ixgbe_mac_82599EB)
+			netdev->features |= NETIF_F_SCTP_CSUM;
+	} else {
 		netdev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
+		if (adapter->hw.mac.type == ixgbe_mac_82599EB)
+			netdev->features &= ~NETIF_F_SCTP_CSUM;
+	}
 
 	return 0;
 }

drivers/net/ixgbe/ixgbe_main.c

@@ -4189,12 +4189,18 @@ static bool ixgbe_tx_csum(struct ixgbe_adapter *adapter,
 				if (ip_hdr(skb)->protocol == IPPROTO_TCP)
 					type_tucmd_mlhl |=
 					        IXGBE_ADVTXD_TUCMD_L4T_TCP;
+				else if (ip_hdr(skb)->protocol == IPPROTO_SCTP)
+					type_tucmd_mlhl |=
+					        IXGBE_ADVTXD_TUCMD_L4T_SCTP;
 				break;
 			case cpu_to_be16(ETH_P_IPV6):
 				/* XXX what about other V6 headers?? */
 				if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
 					type_tucmd_mlhl |=
 					        IXGBE_ADVTXD_TUCMD_L4T_TCP;
+				else if (ipv6_hdr(skb)->nexthdr == IPPROTO_SCTP)
+					type_tucmd_mlhl |=
+					        IXGBE_ADVTXD_TUCMD_L4T_SCTP;
 				break;
 			default:
 				if (unlikely(net_ratelimit())) {
@@ -4718,6 +4724,9 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
 	netdev->features |= NETIF_F_TSO6;
 	netdev->features |= NETIF_F_GRO;
 
+	if (adapter->hw.mac.type == ixgbe_mac_82599EB)
+		netdev->features |= NETIF_F_SCTP_CSUM;
+
 	netdev->vlan_features |= NETIF_F_TSO;
 	netdev->vlan_features |= NETIF_F_TSO6;
 	netdev->vlan_features |= NETIF_F_IP_CSUM;