netdev - [PATCH net-next 5/6] r8169: improve rtl8169_tso_csum

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Date:   Sat, 18 Apr 2020 23:10:44 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next 5/6] r8169: improve rtl8169_tso_csum_v2

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

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index e4bb6f36c..c7d9325f4 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4125,25 +4125,20 @@ 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;
-- 
2.26.1