ixgbe: Add 1000BASE-BX support

Added support for 1000BASE-BX, i.e. Gigabit Ethernet over single strand
of single-mode fiber.
The initialization of a 1000BASE-BX SFP is the same as 1000BASE-SX/LX
with the only difference that the Bit Rate Nominal Value must be
checked to make sure it is a Gigabit Ethernet transceiver, as described
by the SFF-8472 specification.

This was tested with the FS.com SFP-GE-BX 1310/1490nm 10km transceiver:
$ ethtool -m eth4
        Identifier                                : 0x03 (SFP)
        Extended identifier                       : 0x04 (GBIC/SFP defined by 2-wire interface ID)
        Connector                                 : 0x07 (LC)
        Transceiver codes                         : 0x00 0x00 0x00 0x40 0x00 0x00 0x00 0x00 0x00
        Transceiver type                          : Ethernet: BASE-BX10
        Encoding                                  : 0x01 (8B/10B)
        BR, Nominal                               : 1300MBd
        Rate identifier                           : 0x00 (unspecified)
        Length (SMF,km)                           : 10km
        Length (SMF)                              : 10000m
        Length (50um)                             : 0m
        Length (62.5um)                           : 0m
        Length (Copper)                           : 0m
        Length (OM3)                              : 0m
        Laser wavelength                          : 1310nm
        Vendor name                               : FS
        Vendor OUI                                : 64:9d:99
        Vendor PN                                 : SFP-GE-BX
        Vendor rev                                :
        Option values                             : 0x20 0x0a
        Option                                    : RX_LOS implemented
        Option                                    : TX_FAULT implemented
        Option                                    : Power level 3 requirement
        BR margin, max                            : 0%
        BR margin, min                            : 0%
        Vendor SN                                 : S2202359108
        Date code                                 : 220307
        Optical diagnostics support               : Yes
        Laser bias current                        : 17.650 mA
        Laser output power                        : 0.2132 mW / -6.71 dBm
        Receiver signal average optical power     : 0.2740 mW / -5.62 dBm
        Module temperature                        : 47.30 degrees C / 117.13 degrees F
        Module voltage                            : 3.2576 V
        Alarm/warning flags implemented           : Yes
        Laser bias current high alarm             : Off
        Laser bias current low alarm              : Off
        Laser bias current high warning           : Off
        Laser bias current low warning            : Off
        Laser output power high alarm             : Off
        Laser output power low alarm              : Off
        Laser output power high warning           : Off
        Laser output power low warning            : Off
        Module temperature high alarm             : Off
        Module temperature low alarm              : Off
        Module temperature high warning           : Off
        Module temperature low warning            : Off
        Module voltage high alarm                 : Off
        Module voltage low alarm                  : Off
        Module voltage high warning               : Off
        Module voltage low warning                : Off
        Laser rx power high alarm                 : Off
        Laser rx power low alarm                  : Off
        Laser rx power high warning               : Off
        Laser rx power low warning                : Off
        Laser bias current high alarm threshold   : 110.000 mA
        Laser bias current low alarm threshold    : 1.000 mA
        Laser bias current high warning threshold : 100.000 mA
        Laser bias current low warning threshold  : 1.000 mA
        Laser output power high alarm threshold   : 0.7079 mW / -1.50 dBm
        Laser output power low alarm threshold    : 0.0891 mW / -10.50 dBm
        Laser output power high warning threshold : 0.6310 mW / -2.00 dBm
        Laser output power low warning threshold  : 0.1000 mW / -10.00 dBm
        Module temperature high alarm threshold   : 90.00 degrees C / 194.00 degrees F
        Module temperature low alarm threshold    : -45.00 degrees C / -49.00 degrees F
        Module temperature high warning threshold : 85.00 degrees C / 185.00 degrees F
        Module temperature low warning threshold  : -40.00 degrees C / -40.00 degrees F
        Module voltage high alarm threshold       : 3.7950 V
        Module voltage low alarm threshold        : 2.8050 V
        Module voltage high warning threshold     : 3.4650 V
        Module voltage low warning threshold      : 3.1350 V
        Laser rx power high alarm threshold       : 0.7079 mW / -1.50 dBm
        Laser rx power low alarm threshold        : 0.0028 mW / -25.53 dBm
        Laser rx power high warning threshold     : 0.6310 mW / -2.00 dBm
        Laser rx power low warning threshold      : 0.0032 mW / -24.95 dBm

Signed-off-by: Ernesto Castellotti <ernesto@castellotti.net>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Tested-by: Sunitha Mekala <sunithax.d.mekala@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://lore.kernel.org/r/20240301184806.2634508-3-anthony.l.nguyen@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

5 files changed, 38 insertions, 5 deletions

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
index e0c300fe5cee..cdaf087b4e85 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
@@ -334,7 +334,9 @@ static int ixgbe_get_link_capabilities_82599(struct ixgbe_hw *hw,
 	    hw->phy.sfp_type == ixgbe_sfp_type_1g_lx_core0 ||
 	    hw->phy.sfp_type == ixgbe_sfp_type_1g_lx_core1 ||
 	    hw->phy.sfp_type == ixgbe_sfp_type_1g_sx_core0 ||
-	    hw->phy.sfp_type == ixgbe_sfp_type_1g_sx_core1) {
+	    hw->phy.sfp_type == ixgbe_sfp_type_1g_sx_core1 ||
+	    hw->phy.sfp_type == ixgbe_sfp_type_1g_bx_core0 ||
+	    hw->phy.sfp_type == ixgbe_sfp_type_1g_bx_core1) {
 		*speed = IXGBE_LINK_SPEED_1GB_FULL;
 		*autoneg = true;
 		return 0;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
index 633bac1543dd..6e6e6f1847b6 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
@@ -349,6 +349,8 @@ static int ixgbe_get_link_ksettings(struct net_device *netdev,
 		case ixgbe_sfp_type_1g_sx_core1:
 		case ixgbe_sfp_type_1g_lx_core0:
 		case ixgbe_sfp_type_1g_lx_core1:
+		case ixgbe_sfp_type_1g_bx_core0:
+		case ixgbe_sfp_type_1g_bx_core1:
 			ethtool_link_ksettings_add_link_mode(cmd, supported,
 							     FIBRE);
 			ethtool_link_ksettings_add_link_mode(cmd, advertising,
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
index 75e9453331ed..07eaa3c3f4d3 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
@@ -1532,6 +1532,7 @@ int ixgbe_identify_sfp_module_generic(struct ixgbe_hw *hw)
 	enum ixgbe_sfp_type stored_sfp_type = hw->phy.sfp_type;
 	struct ixgbe_adapter *adapter = hw->back;
 	u8 oui_bytes[3] = {0, 0, 0};
+	u8 bitrate_nominal = 0;
 	u8 comp_codes_10g = 0;
 	u8 comp_codes_1g = 0;
 	u16 enforce_sfp = 0;
@@ -1576,7 +1577,12 @@ int ixgbe_identify_sfp_module_generic(struct ixgbe_hw *hw)
 	status = hw->phy.ops.read_i2c_eeprom(hw,
 					     IXGBE_SFF_CABLE_TECHNOLOGY,
 					     &cable_tech);
+	if (status)
+		goto err_read_i2c_eeprom;
 
+	status = hw->phy.ops.read_i2c_eeprom(hw,
+					     IXGBE_SFF_BITRATE_NOMINAL,
+					     &bitrate_nominal);
 	if (status)
 		goto err_read_i2c_eeprom;
 
@@ -1659,6 +1665,18 @@ int ixgbe_identify_sfp_module_generic(struct ixgbe_hw *hw)
 			else
 				hw->phy.sfp_type =
 					ixgbe_sfp_type_1g_lx_core1;
+		/* Support only Ethernet 1000BASE-BX10, checking the Bit Rate
+		 * Nominal Value as per SFF-8472 by convention 1.25 Gb/s should
+		 * be rounded up to 0Dh (13 in units of 100 MBd) for 1000BASE-BX
+		 */
+		} else if ((comp_codes_1g & IXGBE_SFF_BASEBX10_CAPABLE) &&
+			   (bitrate_nominal == 0xD)) {
+			if (hw->bus.lan_id == 0)
+				hw->phy.sfp_type =
+					ixgbe_sfp_type_1g_bx_core0;
+			else
+				hw->phy.sfp_type =
+					ixgbe_sfp_type_1g_bx_core1;
 		} else {
 			hw->phy.sfp_type = ixgbe_sfp_type_unknown;
 		}
@@ -1747,7 +1765,9 @@ int ixgbe_identify_sfp_module_generic(struct ixgbe_hw *hw)
 	      hw->phy.sfp_type == ixgbe_sfp_type_1g_lx_core0 ||
 	      hw->phy.sfp_type == ixgbe_sfp_type_1g_lx_core1 ||
 	      hw->phy.sfp_type == ixgbe_sfp_type_1g_sx_core0 ||
-	      hw->phy.sfp_type == ixgbe_sfp_type_1g_sx_core1)) {
+	      hw->phy.sfp_type == ixgbe_sfp_type_1g_sx_core1 ||
+	      hw->phy.sfp_type == ixgbe_sfp_type_1g_bx_core0 ||
+	      hw->phy.sfp_type == ixgbe_sfp_type_1g_bx_core1)) {
 		hw->phy.type = ixgbe_phy_sfp_unsupported;
 		return -EOPNOTSUPP;
 	}
@@ -1763,7 +1783,9 @@ int ixgbe_identify_sfp_module_generic(struct ixgbe_hw *hw)
 	      hw->phy.sfp_type == ixgbe_sfp_type_1g_lx_core0 ||
 	      hw->phy.sfp_type == ixgbe_sfp_type_1g_lx_core1 ||
 	      hw->phy.sfp_type == ixgbe_sfp_type_1g_sx_core0 ||
-	      hw->phy.sfp_type == ixgbe_sfp_type_1g_sx_core1)) {
+	      hw->phy.sfp_type == ixgbe_sfp_type_1g_sx_core1 ||
+	      hw->phy.sfp_type == ixgbe_sfp_type_1g_bx_core0 ||
+	      hw->phy.sfp_type == ixgbe_sfp_type_1g_bx_core1)) {
 		/* Make sure we're a supported PHY type */
 		if (hw->phy.type == ixgbe_phy_sfp_intel)
 			return 0;
@@ -1999,12 +2021,14 @@ int ixgbe_get_sfp_init_sequence_offsets(struct ixgbe_hw *hw,
 	if (sfp_type == ixgbe_sfp_type_da_act_lmt_core0 ||
 	    sfp_type == ixgbe_sfp_type_1g_lx_core0 ||
 	    sfp_type == ixgbe_sfp_type_1g_cu_core0 ||
-	    sfp_type == ixgbe_sfp_type_1g_sx_core0)
+	    sfp_type == ixgbe_sfp_type_1g_sx_core0 ||
+	    sfp_type == ixgbe_sfp_type_1g_bx_core0)
 		sfp_type = ixgbe_sfp_type_srlr_core0;
 	else if (sfp_type == ixgbe_sfp_type_da_act_lmt_core1 ||
 		 sfp_type == ixgbe_sfp_type_1g_lx_core1 ||
 		 sfp_type == ixgbe_sfp_type_1g_cu_core1 ||
-		 sfp_type == ixgbe_sfp_type_1g_sx_core1)
+		 sfp_type == ixgbe_sfp_type_1g_sx_core1 ||
+		 sfp_type == ixgbe_sfp_type_1g_bx_core1)
 		sfp_type = ixgbe_sfp_type_srlr_core1;
 
 	/* Read offset to PHY init contents */
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h
index beedcb7bec0d..14aa2ca51f70 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h
@@ -17,6 +17,7 @@
 #define IXGBE_SFF_1GBE_COMP_CODES	0x6
 #define IXGBE_SFF_10GBE_COMP_CODES	0x3
 #define IXGBE_SFF_CABLE_TECHNOLOGY	0x8
+#define IXGBE_SFF_BITRATE_NOMINAL	0xC
 #define IXGBE_SFF_CABLE_SPEC_COMP	0x3C
 #define IXGBE_SFF_SFF_8472_SWAP		0x5C
 #define IXGBE_SFF_SFF_8472_COMP		0x5E
@@ -39,6 +40,7 @@
 #define IXGBE_SFF_1GBASESX_CAPABLE		0x1
 #define IXGBE_SFF_1GBASELX_CAPABLE		0x2
 #define IXGBE_SFF_1GBASET_CAPABLE		0x8
+#define IXGBE_SFF_BASEBX10_CAPABLE		0x64
 #define IXGBE_SFF_10GBASESR_CAPABLE		0x10
 #define IXGBE_SFF_10GBASELR_CAPABLE		0x20
 #define IXGBE_SFF_SOFT_RS_SELECT_MASK		0x8
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
index d44c58130be2..ed440dd0c4f9 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -3210,6 +3210,9 @@ enum ixgbe_sfp_type {
 	ixgbe_sfp_type_1g_sx_core1 = 12,
 	ixgbe_sfp_type_1g_lx_core0 = 13,
 	ixgbe_sfp_type_1g_lx_core1 = 14,
+	ixgbe_sfp_type_1g_bx_core0 = 15,
+	ixgbe_sfp_type_1g_bx_core1 = 16,
+
 	ixgbe_sfp_type_not_present = 0xFFFE,
 	ixgbe_sfp_type_unknown = 0xFFFF
 };