From f99ae312b20809b1e0f96ce9db2218bcbc066cd6 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Thu, 25 Feb 2021 16:05:19 +0100
Subject: [PATCH 08/19] r8169: fix jumbo packet handling on RTL8168e
Git-commit: 6cf739131a15e4177e58a1b4f2bede9d5da78552
Patch-mainline: v5.12-rc1
References: git-fixes

Josef reported [0] that using jumbo packets fails on RTL8168e.
Aligning the values for register MaxTxPacketSize with the
vendor driver fixes the problem.

[0] https://bugzilla.kernel.org/show_bug.cgi?id=211827

Fixes: d58d46b5d851 ("r8169: jumbo fixes.")
Reported-by: Josef Oškera <joskera@redhat.com>
Tested-by: Josef Oškera <joskera@redhat.com>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/b15ddef7-0d50-4320-18f4-6a3f86fbfd3e@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
 drivers/net/ethernet/realtek/r8169.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 073ccf996c4c..7fc5f683b9ee 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -5067,7 +5067,7 @@ static void r8168e_hw_jumbo_enable(struct rtl8169_private *tp)
 {
 	void __iomem *ioaddr = tp->mmio_addr;
 
-	RTL_W8(MaxTxPacketSize, 0x3f);
+	RTL_W8(MaxTxPacketSize, 0x24);
 	RTL_W8(Config3, RTL_R8(Config3) | Jumbo_En0);
 	RTL_W8(Config4, RTL_R8(Config4) | 0x01);
 	rtl_tx_performance_tweak(tp->pci_dev, PCI_EXP_DEVCTL_READRQ_512B);
@@ -5077,7 +5077,7 @@ static void r8168e_hw_jumbo_disable(struct rtl8169_private *tp)
 {
 	void __iomem *ioaddr = tp->mmio_addr;
 
-	RTL_W8(MaxTxPacketSize, 0x0c);
+	RTL_W8(MaxTxPacketSize, 0x3f);
 	RTL_W8(Config3, RTL_R8(Config3) & ~Jumbo_En0);
 	RTL_W8(Config4, RTL_R8(Config4) & ~0x01);
 	rtl_tx_performance_tweak(tp->pci_dev, 0x5 << MAX_READ_REQUEST_SHIFT);
-- 
2.16.4