ethtool: Add support for 800Gbps link modes

Add support for 800Gbps speed, link modes of 100Gbps per lane.
As mentioned in slide 21 in IEEE documentation [1], all adopted 802.3df
copper and optical PMDs baselines using 100G/lane will be supported.

Add the relevant PMDs which are mentioned in slide 5 in IEEE
documentation [1] and were approved on 10-2022 [2]:
BP - KR8
Cu Cable - CR8
MMF 50m - VR8
MMF 100m - SR8
SMF 500m - DR8
SMF 2km - DR8-2

[1]: https://www.ieee802.org/3/df/public/22_10/22_1004/shrikhande_3df_01a_221004.pdf
[2]: https://ieee802.org/3/df/KeyMotions_3df_221005.pdf

Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/phy-core.c

@@ -13,7 +13,7 @@
  */
 const char *phy_speed_to_str(int speed)
 {
-	BUILD_BUG_ON_MSG(__ETHTOOL_LINK_MODE_MASK_NBITS != 93,
+	BUILD_BUG_ON_MSG(__ETHTOOL_LINK_MODE_MASK_NBITS != 99,
 		"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");
@@ -49,6 +49,8 @@ const char *phy_speed_to_str(int speed)
 		return "200Gbps";
 	case SPEED_400000:
 		return "400Gbps";
+	case SPEED_800000:
+		return "800Gbps";
 	case SPEED_UNKNOWN:
 		return "Unknown";
 	default:
@@ -157,6 +159,13 @@ EXPORT_SYMBOL_GPL(phy_interface_num_ports);
 			       .bit = ETHTOOL_LINK_MODE_ ## b ## _BIT}
 
 static const struct phy_setting settings[] = {
+	/* 800G */
+	PHY_SETTING( 800000, FULL, 800000baseCR8_Full		),
+	PHY_SETTING( 800000, FULL, 800000baseKR8_Full		),
+	PHY_SETTING( 800000, FULL, 800000baseDR8_Full		),
+	PHY_SETTING( 800000, FULL, 800000baseDR8_2_Full		),
+	PHY_SETTING( 800000, FULL, 800000baseSR8_Full		),
+	PHY_SETTING( 800000, FULL, 800000baseVR8_Full		),
 	/* 400G */
 	PHY_SETTING( 400000, FULL, 400000baseCR8_Full		),
 	PHY_SETTING( 400000, FULL, 400000baseKR8_Full		),

include/uapi/linux/ethtool.h

@@ -1737,6 +1737,13 @@ enum ethtool_link_mode_bit_indices {
 	ETHTOOL_LINK_MODE_100baseFX_Half_BIT		 = 90,
 	ETHTOOL_LINK_MODE_100baseFX_Full_BIT		 = 91,
 	ETHTOOL_LINK_MODE_10baseT1L_Full_BIT		 = 92,
+	ETHTOOL_LINK_MODE_800000baseCR8_Full_BIT	 = 93,
+	ETHTOOL_LINK_MODE_800000baseKR8_Full_BIT	 = 94,
+	ETHTOOL_LINK_MODE_800000baseDR8_Full_BIT	 = 95,
+	ETHTOOL_LINK_MODE_800000baseDR8_2_Full_BIT	 = 96,
+	ETHTOOL_LINK_MODE_800000baseSR8_Full_BIT	 = 97,
+	ETHTOOL_LINK_MODE_800000baseVR8_Full_BIT	 = 98,
+
 	/* must be last entry */
 	__ETHTOOL_LINK_MODE_MASK_NBITS
 };
@@ -1848,6 +1855,7 @@ enum ethtool_link_mode_bit_indices {
 #define SPEED_100000		100000
 #define SPEED_200000		200000
 #define SPEED_400000		400000
+#define SPEED_800000		800000
 
 #define SPEED_UNKNOWN		-1
 

net/ethtool/common.c

@@ -202,6 +202,12 @@ const char link_mode_names[][ETH_GSTRING_LEN] = {
 	__DEFINE_LINK_MODE_NAME(100, FX, Half),
 	__DEFINE_LINK_MODE_NAME(100, FX, Full),
 	__DEFINE_LINK_MODE_NAME(10, T1L, Full),
+	__DEFINE_LINK_MODE_NAME(800000, CR8, Full),
+	__DEFINE_LINK_MODE_NAME(800000, KR8, Full),
+	__DEFINE_LINK_MODE_NAME(800000, DR8, Full),
+	__DEFINE_LINK_MODE_NAME(800000, DR8_2, Full),
+	__DEFINE_LINK_MODE_NAME(800000, SR8, Full),
+	__DEFINE_LINK_MODE_NAME(800000, VR8, Full),
 };
 static_assert(ARRAY_SIZE(link_mode_names) == __ETHTOOL_LINK_MODE_MASK_NBITS);
 
@@ -238,6 +244,8 @@ static_assert(ARRAY_SIZE(link_mode_names) == __ETHTOOL_LINK_MODE_MASK_NBITS);
 #define __LINK_MODE_LANES_X		1
 #define __LINK_MODE_LANES_FX		1
 #define __LINK_MODE_LANES_T1L		1
+#define __LINK_MODE_LANES_VR8		8
+#define __LINK_MODE_LANES_DR8_2		8
 
 #define __DEFINE_LINK_MODE_PARAMS(_speed, _type, _duplex)	\
 	[ETHTOOL_LINK_MODE(_speed, _type, _duplex)] = {		\
@@ -352,6 +360,12 @@ const struct link_mode_info link_mode_params[] = {
 	__DEFINE_LINK_MODE_PARAMS(100, FX, Half),
 	__DEFINE_LINK_MODE_PARAMS(100, FX, Full),
 	__DEFINE_LINK_MODE_PARAMS(10, T1L, Full),
+	__DEFINE_LINK_MODE_PARAMS(800000, CR8, Full),
+	__DEFINE_LINK_MODE_PARAMS(800000, KR8, Full),
+	__DEFINE_LINK_MODE_PARAMS(800000, DR8, Full),
+	__DEFINE_LINK_MODE_PARAMS(800000, DR8_2, Full),
+	__DEFINE_LINK_MODE_PARAMS(800000, SR8, Full),
+	__DEFINE_LINK_MODE_PARAMS(800000, VR8, Full),
 };
 static_assert(ARRAY_SIZE(link_mode_params) == __ETHTOOL_LINK_MODE_MASK_NBITS);