r8169: fix jumbo packet handling on RTL8168e

[ 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@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: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 75f7743..cfcc3ac 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -2351,14 +2351,14 @@ 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);
 }
 
 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);
 }