From b8bf38440ba94e8ed8e2ae55c5dfb0276d30e843 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Thu, 10 Oct 2024 12:58:02 +0200
Subject: [PATCH] r8169: enable SG/TSO on selected chip versions per default

Due to problem reports in the past SG and TSO/TSO6 are disabled per
default. It's not fully clear which chip versions are affected, so we
may impact also users of unaffected chip versions, unless they know
how to use ethtool for enabling SG/TSO/TSO6.
Vendor drivers r8168/r8125 enable SG/TSO/TSO6 for selected chip
versions per default, I'd interpret this as confirmation that these
chip versions are unaffected. So let's do the same here.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/ethernet/realtek/r8169_main.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -5524,11 +5524,6 @@ static int rtl_init_one(struct pci_dev *
 
 	dev->features |= dev->hw_features;
 
-	/* There has been a number of reports that using SG/TSO results in
-	 * tx timeouts. However for a lot of people SG/TSO works fine.
-	 * Therefore disable both features by default, but allow users to
-	 * enable them. Use at own risk!
-	 */
 	if (rtl_chip_supports_csum_v2(tp)) {
 		dev->hw_features |= NETIF_F_SG | NETIF_F_TSO | NETIF_F_TSO6;
 		netif_set_tso_max_size(dev, RTL_GSO_MAX_SIZE_V2);
@@ -5539,6 +5534,17 @@ static int rtl_init_one(struct pci_dev *
 		netif_set_tso_max_segs(dev, RTL_GSO_MAX_SEGS_V1);
 	}
 
+	/* There has been a number of reports that using SG/TSO results in
+	 * tx timeouts. However for a lot of people SG/TSO works fine.
+	 * It's not fully clear which chip versions are affected. Vendor
+	 * drivers enable SG/TSO for certain chip versions per default,
+	 * let's mimic this here. On other chip versions users can
+	 * use ethtool to enable SG/TSO, use at own risk!
+	 */
+	if (tp->mac_version >= RTL_GIGA_MAC_VER_46 &&
+	    tp->mac_version != RTL_GIGA_MAC_VER_61)
+		dev->features |= dev->hw_features;
+
 	dev->hw_features |= NETIF_F_RXALL;
 	dev->hw_features |= NETIF_F_RXFCS;
 
