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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Roman Mamedov <rm+bko@romanrm.net>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.4 71/73] r8169: dont advertise pause in jumbo mode
Date:   Mon, 19 Apr 2021 15:07:02 +0200
Message-Id: <20210419130526.128554617@linuxfoundation.org>
In-Reply-To: <20210419130523.802169214@linuxfoundation.org>
References: <20210419130523.802169214@linuxfoundation.org>
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From: Heiner Kallweit <hkallweit1@gmail.com>

[ Upstream commit 453a77894efa4d9b6ef9644d74b9419c47ac427c ]

It has been reported [0] that using pause frames in jumbo mode impacts
performance. There's no available chip documentation, but vendor
drivers r8168 and r8125 don't advertise pause in jumbo mode. So let's
do the same, according to Roman it fixes the issue.

[0] https://bugzilla.kernel.org/show_bug.cgi?id=212617

Fixes: 9cf9b84cc701 ("r8169: make use of phy_set_asym_pause")
Reported-by: Roman Mamedov <rm+bko@romanrm.net>
Tested-by: Roman Mamedov <rm+bko@romanrm.net>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/realtek/r8169_main.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 4e4953b1433a..8ff178fc2670 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4138,6 +4138,13 @@ static void rtl_jumbo_config(struct rtl8169_private *tp)
 
 	if (pci_is_pcie(tp->pci_dev) && tp->supports_gmii)
 		pcie_set_readrq(tp->pci_dev, readrq);
+
+	/* Chip doesn't support pause in jumbo mode */
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT,
+			 tp->phydev->advertising, !jumbo);
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
+			 tp->phydev->advertising, !jumbo);
+	phy_start_aneg(tp->phydev);
 }
 
 DECLARE_RTL_COND(rtl_chipcmd_cond)
@@ -6314,8 +6321,6 @@ static int r8169_phy_connect(struct rtl8169_private *tp)
 	if (!tp->supports_gmii)
 		phy_set_max_speed(phydev, SPEED_100);
 
-	phy_support_asym_pause(phydev);
-
 	phy_attached_info(phydev);
 
 	return 0;
-- 
2.30.2