[net-next PATCH v2] ixgbe:add support for a new 82599 10G Base-T device

[Jeff Kirsher <jeffrey.t.kirsher@intel.com>]

From: Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>

This adds support for a new copper device for 82599, device id 0x151c.
This 82599 10GBase-T device uses the PHY's internal temperature sensor
to guard against over-temp conditions. In this scenario the PHY will be
put in a low power mode and link will no longer be able to transmit or
receive any data. When this occurs, the over-temp interrupt is latched
and driver logs this error message. A HW reset or power cycle is
required to clear this status.

Signed-off-by: Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

 drivers/net/ixgbe/ixgbe.h       |    3 ++
 drivers/net/ixgbe/ixgbe_82598.c |    1 +
 drivers/net/ixgbe/ixgbe_82599.c |    1 +
 drivers/net/ixgbe/ixgbe_main.c  |   69 +++++++++++++++++++++++++++++++++++++++
 drivers/net/ixgbe/ixgbe_phy.c   |   31 ++++++++++++++++++
 drivers/net/ixgbe/ixgbe_phy.h   |    3 ++
 drivers/net/ixgbe/ixgbe_type.h  |    4 ++
 7 files changed, 112 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe.h b/drivers/net/ixgbe/ixgbe.h
index d0ea3d6..ffae480 100644
--- a/drivers/net/ixgbe/ixgbe.h
+++ b/drivers/net/ixgbe/ixgbe.h
@@ -360,6 +360,7 @@ struct ixgbe_adapter {
 	u32 flags2;
 #define IXGBE_FLAG2_RSC_CAPABLE                 (u32)(1)
 #define IXGBE_FLAG2_RSC_ENABLED                 (u32)(1 << 1)
+#define IXGBE_FLAG2_TEMP_SENSOR_CAPABLE         (u32)(1 << 2)
 /* default to trying for four seconds */
 #define IXGBE_TRY_LINK_TIMEOUT (4 * HZ)
 
@@ -407,6 +408,8 @@ struct ixgbe_adapter {
 	u16 eeprom_version;
 
 	int node;
+	struct work_struct check_overtemp_task;
+	u32 interrupt_event;
 
 	/* SR-IOV */
 	DECLARE_BITMAP(active_vfs, IXGBE_MAX_VF_FUNCTIONS);
diff --git a/drivers/net/ixgbe/ixgbe_82598.c b/drivers/net/ixgbe/ixgbe_82598.c
index f2b7ff4..9c02d60 100644
--- a/drivers/net/ixgbe/ixgbe_82598.c
+++ b/drivers/net/ixgbe/ixgbe_82598.c
@@ -1236,6 +1236,7 @@ static struct ixgbe_phy_operations phy_ops_82598 = {
 	.setup_link		= &ixgbe_setup_phy_link_generic,
 	.setup_link_speed	= &ixgbe_setup_phy_link_speed_generic,
 	.read_i2c_eeprom	= &ixgbe_read_i2c_eeprom_82598,
+	.check_overtemp   = &ixgbe_tn_check_overtemp,
 };
 
 struct ixgbe_info ixgbe_82598_info = {
diff --git a/drivers/net/ixgbe/ixgbe_82599.c b/drivers/net/ixgbe/ixgbe_82599.c
index e9706eb..a4e2901 100644
--- a/drivers/net/ixgbe/ixgbe_82599.c
+++ b/drivers/net/ixgbe/ixgbe_82599.c
@@ -2395,6 +2395,7 @@ static struct ixgbe_phy_operations phy_ops_82599 = {
 	.write_i2c_byte         = &ixgbe_write_i2c_byte_generic,
 	.read_i2c_eeprom        = &ixgbe_read_i2c_eeprom_generic,
 	.write_i2c_eeprom       = &ixgbe_write_i2c_eeprom_generic,
+	.check_overtemp         = &ixgbe_tn_check_overtemp,
 };
 
 struct ixgbe_info ixgbe_82599_info = {
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 9551cbb..d571d10 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -108,6 +108,8 @@ static DEFINE_PCI_DEVICE_TABLE(ixgbe_pci_tbl) = {
 	 board_82599 },
 	{PCI_VDEVICE(INTEL, IXGBE_DEV_ID_82599_CX4),
 	 board_82599 },
+	{PCI_VDEVICE(INTEL, IXGBE_DEV_ID_82599_T3_LOM),
+	 board_82599 },
 	{PCI_VDEVICE(INTEL, IXGBE_DEV_ID_82599_COMBO_BACKPLANE),
 	 board_82599 },
 
@@ -1618,6 +1620,48 @@ static void ixgbe_set_itr_msix(struct ixgbe_q_vector *q_vector)
 	}
 }
 
+/**
+ * ixgbe_check_overtemp_task - worker thread to check over tempurature
+ * @work: pointer to work_struct containing our data
+ **/
+static void ixgbe_check_overtemp_task(struct work_struct *work)
+{
+	struct ixgbe_adapter *adapter = container_of(work,
+	                                             struct ixgbe_adapter,
+	                                             check_overtemp_task);
+	struct ixgbe_hw *hw = &adapter->hw;
+	u32 eicr = adapter->interrupt_event;
+
+	if (adapter->flags2 & IXGBE_FLAG2_TEMP_SENSOR_CAPABLE) {
+		switch (hw->device_id) {
+		case IXGBE_DEV_ID_82599_T3_LOM: {
+			u32 autoneg;
+			bool link_up = false;
+
+			if (hw->mac.ops.check_link)
+				hw->mac.ops.check_link(hw, &autoneg, &link_up, false);
+
+			if (((eicr & IXGBE_EICR_GPI_SDP0) && (!link_up)) ||
+			    (eicr & IXGBE_EICR_LSC))
+				/* Check if this is due to overtemp */
+				if (hw->phy.ops.check_overtemp(hw) == IXGBE_ERR_OVERTEMP)
+					break;
+			}
+			return;
+		default:
+			if (!(eicr & IXGBE_EICR_GPI_SDP0))
+				return;
+			break;
+		}
+		DPRINTK(DRV, ERR, "Network adapter has been stopped because it "
+		        "has over heated. Restart the computer. If the problem "
+		        "persists, power off the system and replace the "
+		        "adapter\n");
+		/* write to clear the interrupt */
+		IXGBE_WRITE_REG(hw, IXGBE_EICR, IXGBE_EICR_GPI_SDP0);
+	}
+}
+
 static void ixgbe_check_fan_failure(struct ixgbe_adapter *adapter, u32 eicr)
 {
 	struct ixgbe_hw *hw = &adapter->hw;
@@ -1689,6 +1733,10 @@ static irqreturn_t ixgbe_msix_lsc(int irq, void *data)
 
 	if (hw->mac.type == ixgbe_mac_82599EB) {
 		ixgbe_check_sfp_event(adapter, eicr);
+		adapter->interrupt_event = eicr;
+		if ((adapter->flags2 & IXGBE_FLAG2_TEMP_SENSOR_CAPABLE) &&
+		    ((eicr & IXGBE_EICR_GPI_SDP0) || (eicr & IXGBE_EICR_LSC)))
+			schedule_work(&adapter->check_overtemp_task);
 
 		/* Handle Flow Director Full threshold interrupt */
 		if (eicr & IXGBE_EICR_FLOW_DIR) {
@@ -2190,6 +2238,8 @@ static inline void ixgbe_irq_enable(struct ixgbe_adapter *adapter)
 	u32 mask;
 
 	mask = (IXGBE_EIMS_ENABLE_MASK & ~IXGBE_EIMS_RTX_QUEUE);
+	if (adapter->flags2 & IXGBE_FLAG2_TEMP_SENSOR_CAPABLE)
+		mask |= IXGBE_EIMS_GPI_SDP0;
 	if (adapter->flags & IXGBE_FLAG_FAN_FAIL_CAPABLE)
 		mask |= IXGBE_EIMS_GPI_SDP1;
 	if (adapter->hw.mac.type == ixgbe_mac_82599EB) {
@@ -2250,6 +2300,9 @@ static irqreturn_t ixgbe_intr(int irq, void *data)
 		ixgbe_check_sfp_event(adapter, eicr);
 
 	ixgbe_check_fan_failure(adapter, eicr);
+	if ((adapter->flags2 & IXGBE_FLAG2_TEMP_SENSOR_CAPABLE) &&
+	    ((eicr & IXGBE_EICR_GPI_SDP0) || (eicr & IXGBE_EICR_LSC)))
+		schedule_work(&adapter->check_overtemp_task);
 
 	if (napi_schedule_prep(&(q_vector->napi))) {
 		adapter->tx_ring[0]->total_packets = 0;
@@ -3265,6 +3318,13 @@ static int ixgbe_up_complete(struct ixgbe_adapter *adapter)
 		IXGBE_WRITE_REG(hw, IXGBE_EIAM, IXGBE_EICS_RTX_QUEUE);
 	}
 
+	/* Enable Thermal over heat sensor interrupt */
+	if (adapter->flags2 & IXGBE_FLAG2_TEMP_SENSOR_CAPABLE) {
+		gpie = IXGBE_READ_REG(hw, IXGBE_GPIE);
+		gpie |= IXGBE_SDP0_GPIEN;
+		IXGBE_WRITE_REG(hw, IXGBE_GPIE, gpie);
+	}
+
 	/* Enable fan failure interrupt if media type is copper */
 	if (adapter->flags & IXGBE_FLAG_FAN_FAIL_CAPABLE) {
 		gpie = IXGBE_READ_REG(hw, IXGBE_GPIE);
@@ -3666,6 +3726,9 @@ void ixgbe_down(struct ixgbe_adapter *adapter)
 	    adapter->flags & IXGBE_FLAG_FDIR_PERFECT_CAPABLE)
 		cancel_work_sync(&adapter->fdir_reinit_task);
 
+	if (adapter->flags2 & IXGBE_FLAG2_TEMP_SENSOR_CAPABLE)
+		cancel_work_sync(&adapter->check_overtemp_task);
+
 	/* disable transmits in the hardware now that interrupts are off */
 	for (i = 0; i < adapter->num_tx_queues; i++) {
 		j = adapter->tx_ring[i]->reg_idx;
@@ -4645,6 +4708,8 @@ static int __devinit ixgbe_sw_init(struct ixgbe_adapter *adapter)
 		adapter->max_msix_q_vectors = MAX_MSIX_Q_VECTORS_82599;
 		adapter->flags2 |= IXGBE_FLAG2_RSC_CAPABLE;
 		adapter->flags2 |= IXGBE_FLAG2_RSC_ENABLED;
+		if (hw->device_id == IXGBE_DEV_ID_82599_T3_LOM)
+			adapter->flags2 |= IXGBE_FLAG2_TEMP_SENSOR_CAPABLE;
 		if (dev->features & NETIF_F_NTUPLE) {
 			/* Flow Director perfect filter enabled */
 			adapter->flags |= IXGBE_FLAG_FDIR_PERFECT_CAPABLE;
@@ -6561,7 +6626,9 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
 	}
 
 	/* reset_hw fills in the perm_addr as well */
+	hw->phy.reset_if_overtemp = true;
 	err = hw->mac.ops.reset_hw(hw);
+	hw->phy.reset_if_overtemp = false;
 	if (err == IXGBE_ERR_SFP_NOT_PRESENT &&
 	    hw->mac.type == ixgbe_mac_82598EB) {
 		/*
@@ -6730,6 +6797,8 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
 	    adapter->flags & IXGBE_FLAG_FDIR_PERFECT_CAPABLE)
 		INIT_WORK(&adapter->fdir_reinit_task, ixgbe_fdir_reinit_task);
 
+	if (adapter->flags2 & IXGBE_FLAG2_TEMP_SENSOR_CAPABLE)
+		INIT_WORK(&adapter->check_overtemp_task, ixgbe_check_overtemp_task);
 #ifdef CONFIG_IXGBE_DCA
 	if (dca_add_requester(&pdev->dev) == 0) {
 		adapter->flags |= IXGBE_FLAG_DCA_ENABLED;
diff --git a/drivers/net/ixgbe/ixgbe_phy.c b/drivers/net/ixgbe/ixgbe_phy.c
index 22d21af..9c8fb85 100644
--- a/drivers/net/ixgbe/ixgbe_phy.c
+++ b/drivers/net/ixgbe/ixgbe_phy.c
@@ -135,6 +135,11 @@ static enum ixgbe_phy_type ixgbe_get_phy_type_from_id(u32 phy_id)
  **/
 s32 ixgbe_reset_phy_generic(struct ixgbe_hw *hw)
 {
+	/* Don't reset PHY if it's shut down due to overtemp. */
+	if (!hw->phy.reset_if_overtemp &&
+	    (IXGBE_ERR_OVERTEMP == hw->phy.ops.check_overtemp(hw)))
+		return 0;
+
 	/*
 	 * Perform soft PHY reset to the PHY_XS.
 	 * This will cause a soft reset to the PHY
@@ -1345,3 +1350,29 @@ s32 ixgbe_get_phy_firmware_version_tnx(struct ixgbe_hw *hw,
 	return status;
 }
 
+/**
+ *  ixgbe_tn_check_overtemp - Checks if an overtemp occured.
+ *  @hw: pointer to hardware structure
+ *
+ *  Checks if the LASI temp alarm status was triggered due to overtemp
+ **/
+s32 ixgbe_tn_check_overtemp(struct ixgbe_hw *hw)
+{
+	s32 status = 0;
+	u16 phy_data = 0;
+
+	if (hw->device_id != IXGBE_DEV_ID_82599_T3_LOM)
+		goto out;
+
+	/* Check that the LASI temp alarm status was triggered */
+	hw->phy.ops.read_reg(hw, IXGBE_TN_LASI_STATUS_REG,
+	                     MDIO_MMD_PMAPMD, &phy_data);
+
+	if (!(phy_data & IXGBE_TN_LASI_STATUS_TEMP_ALARM))
+		goto out;
+
+	status = IXGBE_ERR_OVERTEMP;
+out:
+	return status;
+}
+
diff --git a/drivers/net/ixgbe/ixgbe_phy.h b/drivers/net/ixgbe/ixgbe_phy.h
index c9c5459..ef4ba83 100644
--- a/drivers/net/ixgbe/ixgbe_phy.h
+++ b/drivers/net/ixgbe/ixgbe_phy.h
@@ -80,6 +80,8 @@
 #define IXGBE_I2C_T_SU_STO  4
 #define IXGBE_I2C_T_BUF     5
 
+#define IXGBE_TN_LASI_STATUS_REG        0x9005
+#define IXGBE_TN_LASI_STATUS_TEMP_ALARM 0x0008
 
 s32 ixgbe_init_phy_ops_generic(struct ixgbe_hw *hw);
 s32 ixgbe_identify_phy_generic(struct ixgbe_hw *hw);
@@ -106,6 +108,7 @@ s32 ixgbe_identify_sfp_module_generic(struct ixgbe_hw *hw);
 s32 ixgbe_get_sfp_init_sequence_offsets(struct ixgbe_hw *hw,
                                         u16 *list_offset,
                                         u16 *data_offset);
+s32 ixgbe_tn_check_overtemp(struct ixgbe_hw *hw);
 s32 ixgbe_read_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
                                 u8 dev_addr, u8 *data);
 s32 ixgbe_write_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
diff --git a/drivers/net/ixgbe/ixgbe_type.h b/drivers/net/ixgbe/ixgbe_type.h
index 39b9be8..2eb6e15 100644
--- a/drivers/net/ixgbe/ixgbe_type.h
+++ b/drivers/net/ixgbe/ixgbe_type.h
@@ -51,6 +51,7 @@
 #define IXGBE_DEV_ID_82599_KX4           0x10F7
 #define IXGBE_DEV_ID_82599_KX4_MEZZ      0x1514
 #define IXGBE_DEV_ID_82599_KR            0x1517
+#define IXGBE_DEV_ID_82599_T3_LOM        0x151C
 #define IXGBE_DEV_ID_82599_CX4           0x10F9
 #define IXGBE_DEV_ID_82599_SFP           0x10FB
 #define IXGBE_DEV_ID_82599_SFP_EM        0x1507
@@ -2470,6 +2471,7 @@ struct ixgbe_phy_operations {
 	s32 (*write_i2c_byte)(struct ixgbe_hw *, u8, u8, u8);
 	s32 (*read_i2c_eeprom)(struct ixgbe_hw *, u8 , u8 *);
 	s32 (*write_i2c_eeprom)(struct ixgbe_hw *, u8, u8);
+	s32 (*check_overtemp)(struct ixgbe_hw *);
 };
 
 struct ixgbe_eeprom_info {
@@ -2518,6 +2520,7 @@ struct ixgbe_phy_info {
 	enum ixgbe_smart_speed          smart_speed;
 	bool                            smart_speed_active;
 	bool                            multispeed_fiber;
+	bool                            reset_if_overtemp;
 };
 
 #include "ixgbe_mbx.h"
@@ -2605,6 +2608,7 @@ struct ixgbe_info {
 #define IXGBE_ERR_FDIR_REINIT_FAILED            -23
 #define IXGBE_ERR_EEPROM_VERSION                -24
 #define IXGBE_ERR_NO_SPACE                      -25
+#define IXGBE_ERR_OVERTEMP                      -26
 #define IXGBE_NOT_IMPLEMENTED                   0x7FFFFFFF
 
 #endif /* _IXGBE_TYPE_H_ */