netdev - [PATCH] r8169: add support for 16K jumbo frames on RTL8125B

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Message-ID: <20250228173505.3636-1-rsalvaterra@gmail.com>
Date: Fri, 28 Feb 2025 17:30:31 +0000
From: Rui Salvaterra <rsalvaterra@...il.com>
To: hkallweit1@...il.com,
	nic_swsd@...ltek.com
Cc: netdev@...r.kernel.org,
	Rui Salvaterra <rsalvaterra@...il.com>
Subject: [PATCH] r8169: add support for 16K jumbo frames on RTL8125B

It's supported, according to the specifications.

Signed-off-by: Rui Salvaterra <rsalvaterra@...il.com>
---

It's very likely that other RTL8125x devices also support 16K jumbo frames, but
I only have RTL8125B ones to test with. Additionally, I've only tested up to 12K
(my switch's limit).

 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 5a5eba49c651..2d9fd2b70735 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	(16 * SZ_1K - VLAN_ETH_HLEN - ETH_FCS_LEN)
 
 static const struct {
 	const char *name;
@@ -5326,6 +5327,9 @@ static int rtl_jumbo_max(struct rtl8169_private *tp)
 	/* RTL8168c */
 	case RTL_GIGA_MAC_VER_18 ... RTL_GIGA_MAC_VER_24:
 		return JUMBO_6K;
+	/* RTL8125B */
+	case RTL_GIGA_MAC_VER_63:
+		return JUMBO_16K;
 	default:
 		return JUMBO_9K;
 	}
-- 
2.48.1