linux-kernel - [PATCH net-next 1/3] net: ethtool: Add support for 1600Gbps speed

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Message-ID: <1763414340-1236872-2-git-send-email-tariqt@nvidia.com>
Date: Mon, 17 Nov 2025 23:18:58 +0200
From: Tariq Toukan <tariqt@...dia.com>
To: Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David
 S. Miller" <davem@...emloft.net>
CC: Jay Vosburgh <jv@...sburgh.net>, Saeed Mahameed <saeedm@...dia.com>,
	"Tariq Toukan" <tariqt@...dia.com>, Mark Bloch <mbloch@...dia.com>, Leon
 Romanovsky <leon@...nel.org>, Heiner Kallweit <hkallweit1@...il.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-rdma@...r.kernel.org>, Gal Pressman <gal@...dia.com>, Moshe Shemesh
	<moshe@...dia.com>, Shahar Shitrit <shshitrit@...dia.com>, Yael Chemla
	<ychemla@...dia.com>, Dragos Tatulea <dtatulea@...dia.com>
Subject: [PATCH net-next 1/3] net: ethtool: Add support for 1600Gbps speed

From: Yael Chemla <ychemla@...dia.com>

Add support for 1600Gbps link modes based on 200Gbps per lane [1].
This includes the adopted IEEE 802.3dj copper and optical PMDs that use
200G/lane signaling [2].

Add the following PMD types:
- KR8 (backplane)
- CR8 (copper cable)
- DR8 (SMF 500m)
- DR8-2 (SMF 2km)

These modes are defined in the 802.3dj specifications.
References:
[1] https://www.ieee802.org/3/dj/public/23_03/opsasnick_3dj_01a_2303.pdf
[2] https://www.ieee802.org/3/dj/projdoc/objectives_P802d3dj_240314.pdf

Signed-off-by: Yael Chemla <ychemla@...dia.com>
Reviewed-by: Shahar Shitrit <shshitrit@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 drivers/net/phy/phy-core.c   | 4 +++-
 include/uapi/linux/ethtool.h | 5 +++++
 net/ethtool/common.c         | 8 ++++++++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/phy-core.c b/drivers/net/phy/phy-core.c
index 605ca20ae192..f5705c75505d 100644
--- a/drivers/net/phy/phy-core.c
+++ b/drivers/net/phy/phy-core.c
@@ -17,7 +17,7 @@
  */
 const char *phy_speed_to_str(int speed)
 {
-	BUILD_BUG_ON_MSG(__ETHTOOL_LINK_MODE_MASK_NBITS != 121,
+	BUILD_BUG_ON_MSG(__ETHTOOL_LINK_MODE_MASK_NBITS != 125,
 		"Enum ethtool_link_mode_bit_indices and phylib are out of sync. "
 		"If a speed or mode has been added please update phy_speed_to_str "
 		"and the PHY settings array.\n");
@@ -55,6 +55,8 @@ const char *phy_speed_to_str(int speed)
 		return "400Gbps";
 	case SPEED_800000:
 		return "800Gbps";
+	case SPEED_1600000:
+		return "1600Gbps";
 	case SPEED_UNKNOWN:
 		return "Unknown";
 	default:
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 8bd5ea5469d9..eb7ff2602fbb 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -2077,6 +2077,10 @@ enum ethtool_link_mode_bit_indices {
 	ETHTOOL_LINK_MODE_800000baseDR4_2_Full_BIT	 = 118,
 	ETHTOOL_LINK_MODE_800000baseSR4_Full_BIT	 = 119,
 	ETHTOOL_LINK_MODE_800000baseVR4_Full_BIT	 = 120,
+	ETHTOOL_LINK_MODE_1600000baseCR8_Full_BIT	 = 121,
+	ETHTOOL_LINK_MODE_1600000baseKR8_Full_BIT	 = 122,
+	ETHTOOL_LINK_MODE_1600000baseDR8_Full_BIT	 = 123,
+	ETHTOOL_LINK_MODE_1600000baseDR8_2_Full_BIT	 = 124,
 
 	/* must be last entry */
 	__ETHTOOL_LINK_MODE_MASK_NBITS
@@ -2190,6 +2194,7 @@ enum ethtool_link_mode_bit_indices {
 #define SPEED_200000		200000
 #define SPEED_400000		400000
 #define SPEED_800000		800000
+#define SPEED_1600000		1600000
 
 #define SPEED_UNKNOWN		-1
 
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index 55223ebc2a7e..369c05cf8163 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -233,6 +233,10 @@ const char link_mode_names[][ETH_GSTRING_LEN] = {
 	__DEFINE_LINK_MODE_NAME(800000, DR4_2, Full),
 	__DEFINE_LINK_MODE_NAME(800000, SR4, Full),
 	__DEFINE_LINK_MODE_NAME(800000, VR4, Full),
+	__DEFINE_LINK_MODE_NAME(1600000, CR8, Full),
+	__DEFINE_LINK_MODE_NAME(1600000, KR8, Full),
+	__DEFINE_LINK_MODE_NAME(1600000, DR8, Full),
+	__DEFINE_LINK_MODE_NAME(1600000, DR8_2, Full),
 };
 static_assert(ARRAY_SIZE(link_mode_names) == __ETHTOOL_LINK_MODE_MASK_NBITS);
 
@@ -422,6 +426,10 @@ const struct link_mode_info link_mode_params[] = {
 	__DEFINE_LINK_MODE_PARAMS(800000, DR4_2, Full),
 	__DEFINE_LINK_MODE_PARAMS(800000, SR4, Full),
 	__DEFINE_LINK_MODE_PARAMS(800000, VR4, Full),
+	__DEFINE_LINK_MODE_PARAMS(1600000, CR8, Full),
+	__DEFINE_LINK_MODE_PARAMS(1600000, KR8, Full),
+	__DEFINE_LINK_MODE_PARAMS(1600000, DR8, Full),
+	__DEFINE_LINK_MODE_PARAMS(1600000, DR8_2, Full),
 };
 static_assert(ARRAY_SIZE(link_mode_params) == __ETHTOOL_LINK_MODE_MASK_NBITS);
 EXPORT_SYMBOL_GPL(link_mode_params);
-- 
2.31.1