r8169: improve rtl8169_tso_csum_v2

Simplify the code and avoid the overhead of calling vlan_get_protocol().

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index e8c55b7..2cd2b03 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4127,25 +4127,20 @@ static bool rtl8169_tso_csum_v2(struct rtl8169_private *tp,
                                struct sk_buff *skb, u32 *opts)
 {
        u32 transport_offset = (u32)skb_transport_offset(skb);
-       u32 mss = skb_shinfo(skb)->gso_size;
+       struct skb_shared_info *shinfo = skb_shinfo(skb);
+       u32 mss = shinfo->gso_size;
 
        if (mss) {
-               switch (vlan_get_protocol(skb)) {
-               case htons(ETH_P_IP):
+               if (shinfo->gso_type & SKB_GSO_TCPV4) {
                        opts[0] |= TD1_GTSENV4;
-                       break;
-
-               case htons(ETH_P_IPV6):
+               } else if (shinfo->gso_type & SKB_GSO_TCPV6) {
                        if (skb_cow_head(skb, 0))
                                return false;
 
                        tcp_v6_gso_csum_prep(skb);
                        opts[0] |= TD1_GTSENV6;
-                       break;
-
-               default:
+               } else {
                        WARN_ON_ONCE(1);
-                       break;
                }
 
                opts[0] |= transport_offset << GTTCPHO_SHIFT;