linux-kernel - [PATCH 5.4 230/340] r8169: fix jumbo packet handling on RTL8168e

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Message-Id: <20210301161059.616249463@linuxfoundation.org>
Date:   Mon,  1 Mar 2021 17:12:54 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Josef Oškera <joskera@...hat.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 230/340] r8169: fix jumbo packet handling on RTL8168e

From: Heiner Kallweit <hkallweit1@...il.com>

[ Upstream commit 6cf739131a15e4177e58a1b4f2bede9d5da78552 ]

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@...hat.com>
Tested-by: Josef Oškera <joskera@...hat.com>
Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
Link: https://lore.kernel.org/r/b15ddef7-0d50-4320-18f4-6a3f86fbfd3e@gmail.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 1e8244ec5b332..131be1fa770cb 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4077,7 +4077,7 @@ static void r8168dp_hw_jumbo_disable(struct rtl8169_private *tp)
 
 static void r8168e_hw_jumbo_enable(struct rtl8169_private *tp)
 {
-	RTL_W8(tp, MaxTxPacketSize, 0x3f);
+	RTL_W8(tp, MaxTxPacketSize, 0x24);
 	RTL_W8(tp, Config3, RTL_R8(tp, Config3) | Jumbo_En0);
 	RTL_W8(tp, Config4, RTL_R8(tp, Config4) | 0x01);
 	rtl_tx_performance_tweak(tp, PCI_EXP_DEVCTL_READRQ_512B);
@@ -4085,7 +4085,7 @@ static void r8168e_hw_jumbo_enable(struct rtl8169_private *tp)
 
 static void r8168e_hw_jumbo_disable(struct rtl8169_private *tp)
 {
-	RTL_W8(tp, MaxTxPacketSize, 0x0c);
+	RTL_W8(tp, MaxTxPacketSize, 0x3f);
 	RTL_W8(tp, Config3, RTL_R8(tp, Config3) & ~Jumbo_En0);
 	RTL_W8(tp, Config4, RTL_R8(tp, Config4) & ~0x01);
 	rtl_tx_performance_tweak(tp, PCI_EXP_DEVCTL_READRQ_4096B);
-- 
2.27.0