net: Fix IPv6 GSO type checks in Intel ethernet drivers

Found this problem when testing IPv6 from a KVM guest to a remote
host via e1000e device on the host.
The following patch fixes the check for IPv6 GSO packet in Intel
ethernet drivers to use skb_is_gso_v6(). SKB_GSO_DODGY is also set
when packets are forwarded from a guest.

Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/e1000e/netdev.c

@@ -3786,7 +3786,7 @@ static int e1000_tso(struct e1000_adapter *adapter,
 		                                         0, IPPROTO_TCP, 0);
 		cmd_length = E1000_TXD_CMD_IP;
 		ipcse = skb_transport_offset(skb) - 1;
-	} else if (skb_shinfo(skb)->gso_type == SKB_GSO_TCPV6) {
+	} else if (skb_is_gso_v6(skb)) {
 		ipv6_hdr(skb)->payload_len = 0;
 		tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 		                                       &ipv6_hdr(skb)->daddr,

drivers/net/igb/igb_main.c

@@ -3422,7 +3422,7 @@ static inline int igb_tso_adv(struct igb_ring *tx_ring,
 							 iph->daddr, 0,
 							 IPPROTO_TCP,
 							 0);
-	} else if (skb_shinfo(skb)->gso_type == SKB_GSO_TCPV6) {
+	} else if (skb_is_gso_v6(skb)) {
 		ipv6_hdr(skb)->payload_len = 0;
 		tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 						       &ipv6_hdr(skb)->daddr,

drivers/net/igbvf/netdev.c

@@ -1963,7 +1963,7 @@ static int igbvf_tso(struct igbvf_adapter *adapter,
 		                                         iph->daddr, 0,
 		                                         IPPROTO_TCP,
 		                                         0);
-	} else if (skb_shinfo(skb)->gso_type == SKB_GSO_TCPV6) {
+	} else if (skb_is_gso_v6(skb)) {
 		ipv6_hdr(skb)->payload_len = 0;
 		tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 		                                       &ipv6_hdr(skb)->daddr,

drivers/net/ixgbe/ixgbe_main.c

@@ -4928,7 +4928,7 @@ static int ixgbe_tso(struct ixgbe_adapter *adapter,
 			                                         iph->daddr, 0,
 			                                         IPPROTO_TCP,
 			                                         0);
-		} else if (skb_shinfo(skb)->gso_type == SKB_GSO_TCPV6) {
+		} else if (skb_is_gso_v6(skb)) {
 			ipv6_hdr(skb)->payload_len = 0;
 			tcp_hdr(skb)->check =
 			    ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,