netdev - [PATCH net-next] r8169: increase max jumbo packet size on RTL8125/RTL8126

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Message-ID: <396762ad-cc65-4e60-b01e-8847db89e98b@gmail.com>
Date: Fri, 7 Mar 2025 08:29:47 +0100
From: Heiner Kallweit <hkallweit1@...il.com>
To: Realtek linux nic maintainers <nic_swsd@...ltek.com>,
 Andrew Lunn <andrew+netdev@...n.ch>, Paolo Abeni <pabeni@...hat.com>,
 Jakub Kicinski <kuba@...nel.org>, David Miller <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Simon Horman <horms@...nel.org>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 Rui Salvaterra <rsalvaterra@...il.com>
Subject: [PATCH net-next] r8169: increase max jumbo packet size on
 RTL8125/RTL8126

Realtek confirmed that all RTL8125/RTL8126 chip versions support up to
16K jumbo packets. Reflect this in the driver.

Tested by Rui on RTL8125B with 12K jumbo packets.

Suggested-by: Rui Salvaterra <rsalvaterra@...il.com>
Tested-by: Rui Salvaterra <rsalvaterra@...il.com>
Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index fa339bd8c..b18daeeda 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -89,6 +89,7 @@
 #define JUMBO_6K	(6 * SZ_1K - VLAN_ETH_HLEN - ETH_FCS_LEN)
 #define JUMBO_7K	(7 * SZ_1K - VLAN_ETH_HLEN - ETH_FCS_LEN)
 #define JUMBO_9K	(9 * SZ_1K - VLAN_ETH_HLEN - ETH_FCS_LEN)
+#define JUMBO_16K	(SZ_16K - VLAN_ETH_HLEN - ETH_FCS_LEN)
 
 static const struct {
 	const char *name;
@@ -5360,6 +5361,9 @@ static int rtl_jumbo_max(struct rtl8169_private *tp)
 	/* RTL8168c */
 	case RTL_GIGA_MAC_VER_18 ... RTL_GIGA_MAC_VER_24:
 		return JUMBO_6K;
+	/* RTL8125/8126 */
+	case RTL_GIGA_MAC_VER_61 ... RTL_GIGA_MAC_VER_71:
+		return JUMBO_16K;
 	default:
 		return JUMBO_9K;
 	}
-- 
2.48.1