netdev - [PATCH net-next] r8169: improve handling of TD_MSS

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Message-ID: <eda95a7b-2873-538a-567a-4fe9e1ca2bb2@gmail.com>
Date:   Sun, 29 Mar 2020 18:28:45 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     David Miller <davem@...emloft.net>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next] r8169: improve handling of TD_MSS_MAX

If the mtu is greater than TD_MSS_MAX, then TSO is disabled, see
rtl8169_fix_features(). Because mss is less than mtu, we can't have
the case mss > TD_MSS_MAX in the TSO path.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 9971135a7..5990147c0 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4106,7 +4106,7 @@ static void rtl8169_tso_csum_v1(struct sk_buff *skb, u32 *opts)
 
 	if (mss) {
 		opts[0] |= TD_LSO;
-		opts[0] |= min(mss, TD_MSS_MAX) << TD0_MSS_SHIFT;
+		opts[0] |= mss << TD0_MSS_SHIFT;
 	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
 		const struct iphdr *ip = ip_hdr(skb);
 
@@ -4145,7 +4145,7 @@ static bool rtl8169_tso_csum_v2(struct rtl8169_private *tp,
 		}
 
 		opts[0] |= transport_offset << GTTCPHO_SHIFT;
-		opts[1] |= min(mss, TD_MSS_MAX) << TD1_MSS_SHIFT;
+		opts[1] |= mss << TD1_MSS_SHIFT;
 	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
 		u8 ip_protocol;
 
-- 
2.26.0