[net-next PATCH 1/4] e1000e: add aer support

[net-next PATCH 1/4] e1000e: add aer support

[Jeff Kirsher]

From: Jesse Brandeburg <jesse.brandeburg@intel.com>

most if not all of the devices supported by e1000e support
AER (Advanced Error Reporting) so we attempt to register
with the OS that we know how to reset ourselves after
a fatal error.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

 drivers/net/e1000e/netdev.c |   39 ++++++++++++++++++++++++++++++---------
 1 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index c425b19..00e19e9 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -44,6 +44,7 @@
 #include <linux/cpu.h>
 #include <linux/smp.h>
 #include <linux/pm_qos_params.h>
+#include <linux/aer.h>
 
 #include "e1000.h"
 
@@ -4521,6 +4522,14 @@ static int e1000_resume(struct pci_dev *pdev)
 		return err;
 	}
 
+	/* AER (Advanced Error Reporting) hooks */
+	err = pci_enable_pcie_error_reporting(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "pci_enable_pcie_error_reporting failed "
+		                    "0x%x\n", err);
+		/* non-fatal, continue */
+	}
+
 	pci_set_master(pdev);
 
 	pci_enable_wake(pdev, PCI_D3hot, 0);
@@ -4615,24 +4624,29 @@ static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev)
 	struct e1000_adapter *adapter = netdev_priv(netdev);
 	struct e1000_hw *hw = &adapter->hw;
 	int err;
+	pci_ers_result_t result;
 
 	e1000e_disable_l1aspm(pdev);
 	err = pci_enable_device_mem(pdev);
 	if (err) {
 		dev_err(&pdev->dev,
 			"Cannot re-enable PCI device after reset.\n");
-		return PCI_ERS_RESULT_DISCONNECT;
-	}
-	pci_set_master(pdev);
-	pci_restore_state(pdev);
+		result = PCI_ERS_RESULT_DISCONNECT;
+	} else {
+		pci_set_master(pdev);
+		pci_restore_state(pdev);
 
-	pci_enable_wake(pdev, PCI_D3hot, 0);
-	pci_enable_wake(pdev, PCI_D3cold, 0);
+		pci_enable_wake(pdev, PCI_D3hot, 0);
+		pci_enable_wake(pdev, PCI_D3cold, 0);
 
-	e1000e_reset(adapter);
-	ew32(WUS, ~0);
+		e1000e_reset(adapter);
+		ew32(WUS, ~0);
+		result = PCI_ERS_RESULT_RECOVERED;
+	}
 
-	return PCI_ERS_RESULT_RECOVERED;
+	pci_cleanup_aer_uncorrect_error_status(pdev);
+
+	return result;
 }
 
 /**
@@ -5063,6 +5077,7 @@ static void __devexit e1000_remove(struct pci_dev *pdev)
 {
 	struct net_device *netdev = pci_get_drvdata(pdev);
 	struct e1000_adapter *adapter = netdev_priv(netdev);
+	int err;
 
 	/*
 	 * flush_scheduled work may reschedule our watchdog task, so
@@ -5097,6 +5112,12 @@ static void __devexit e1000_remove(struct pci_dev *pdev)
 
 	free_netdev(netdev);
 
+	/* AER disable */
+	err = pci_disable_pcie_error_reporting(pdev);
+	if (err)
+		dev_err(&pdev->dev,
+		        "pci_disable_pcie_error_reporting failed 0x%x\n", err);
+
 	pci_disable_device(pdev);
 }
 

[net-next PATCH 2/4] e1000e: Disable dynamic clock gating for 82571 per si errata.

[Jeff Kirsher]

From: dave graham <david.graham@intel.com>

82571 and 82572 Errata #13 documents that the Si feature DMA Dynamic
Clock Gating should be disabled, and identifies the workaround of
disabling the feature by EEPROM setting. EEPROM versions that do not
include the recommended workaround have been found in the field, and so
some customers remain at risk. Because the feature DMA Dynamic clock
Gating can be disabled by directly setting the appropriate bit in the
E1000_CTRL_EXT register, this patch overrides the EEPROM setting, and
force-disables the feature.

Signed-off-by: dave graham <david.graham@intel.com>
Acked-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

 drivers/net/e1000e/82571.c   |   12 ++++++++++++
 drivers/net/e1000e/defines.h |    1 +
 2 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/drivers/net/e1000e/82571.c b/drivers/net/e1000e/82571.c
index 0890162..25f6bc9 100644
--- a/drivers/net/e1000e/82571.c
+++ b/drivers/net/e1000e/82571.c
@@ -980,6 +980,18 @@ static void e1000_initialize_hw_bits_82571(struct e1000_hw *hw)
 		reg |= E1000_PBA_ECC_CORR_EN;
 		ew32(PBA_ECC, reg);
 	}
+	/*
+	 * Workaround for hardware errata.
+	 * Ensure that DMA Dynamic Clock gating is disabled on 82571 and 82572
+	 */
+
+        if ((hw->mac.type == e1000_82571) ||
+           (hw->mac.type == e1000_82572)) {
+                reg = er32(CTRL_EXT);
+                reg &= ~E1000_CTRL_EXT_DMA_DYN_CLK_EN;
+                ew32(CTRL_EXT, reg);
+        }
+
 
 	/* PCI-Ex Control Registers */
 	if (hw->mac.type == e1000_82574) {
diff --git a/drivers/net/e1000e/defines.h b/drivers/net/e1000e/defines.h
index e6caf29..243aa49 100644
--- a/drivers/net/e1000e/defines.h
+++ b/drivers/net/e1000e/defines.h
@@ -69,6 +69,7 @@
 #define E1000_CTRL_EXT_SDP7_DATA 0x00000080 /* Value of SW Definable Pin 7 */
 #define E1000_CTRL_EXT_EE_RST    0x00002000 /* Reinitialize from EEPROM */
 #define E1000_CTRL_EXT_RO_DIS    0x00020000 /* Relaxed Ordering disable */
+#define E1000_CTRL_EXT_DMA_DYN_CLK_EN 0x00080000 /* DMA Dynamic Clock Gating */
 #define E1000_CTRL_EXT_LINK_MODE_MASK 0x00C00000
 #define E1000_CTRL_EXT_LINK_MODE_PCIE_SERDES  0x00C00000
 #define E1000_CTRL_EXT_EIAME          0x01000000

[net-next PATCH 3/4] e1000e: remove RXSEQ link monitoring for serdes

[Jeff Kirsher]

From: dave graham <david.graham@intel.com>

RXSEQ interrupts were used to force link state interrogation of serdes
links, as the Si was not guaranteed to report LSC interrupts when the
link changed state. On some bladeservers this resulted in false link up
reports if no link partner was connected. The RXSEQ treatment is
not necessary, as the link can be monitored from the watchdog timer, and
the false link indications cease.

Signed-off-by: dave graham <david.graham@intel.com>
Acked-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

 drivers/net/e1000e/netdev.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 00e19e9..04e007d 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -1153,7 +1153,7 @@ static irqreturn_t e1000_intr_msi(int irq, void *data)
 	 * read ICR disables interrupts using IAM
 	 */
 
-	if (icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {
+	if (icr & E1000_ICR_LSC) {
 		hw->mac.get_link_status = 1;
 		/*
 		 * ICH8 workaround-- Call gig speed drop workaround on cable
@@ -1219,7 +1219,7 @@ static irqreturn_t e1000_intr(int irq, void *data)
 	 * IMC write
 	 */
 
-	if (icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {
+	if (icr & E1000_ICR_LSC) {
 		hw->mac.get_link_status = 1;
 		/*
 		 * ICH8 workaround-- Call gig speed drop workaround on cable

[net-next PATCH 4/4] e1000e: Serdes - attempt autoneg when link restored.

[Jeff Kirsher]

From: dave graham <david.graham@intel.com>

This patch addresses an issue where we did not restart auto-negotiation on
serdes links when the link partner was disabled and re-enabled. It includes
reworking the serdes link detect mechanism to be a state machine for
82571 and 82572 parts only.

Signed-off-by: dave graham <david.graham@intel.com>
Acked-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

 drivers/net/e1000e/82571.c |  132 ++++++++++++++++++++++++++++++++++++++++++++
 drivers/net/e1000e/hw.h    |    8 +++
 2 files changed, 139 insertions(+), 1 deletions(-)

diff --git a/drivers/net/e1000e/82571.c b/drivers/net/e1000e/82571.c
index 25f6bc9..565fd4e 100644
--- a/drivers/net/e1000e/82571.c
+++ b/drivers/net/e1000e/82571.c
@@ -61,6 +61,7 @@
 static s32 e1000_get_phy_id_82571(struct e1000_hw *hw);
 static s32 e1000_setup_copper_link_82571(struct e1000_hw *hw);
 static s32 e1000_setup_fiber_serdes_link_82571(struct e1000_hw *hw);
+static s32 e1000_check_for_serdes_link_82571(struct e1000_hw *hw);
 static s32 e1000_write_nvm_eewr_82571(struct e1000_hw *hw, u16 offset,
 				      u16 words, u16 *data);
 static s32 e1000_fix_nvm_checksum_82571(struct e1000_hw *hw);
@@ -250,7 +251,7 @@ static s32 e1000_init_mac_params_82571(struct e1000_adapter *adapter)
 	case e1000_media_type_internal_serdes:
 		func->setup_physical_interface =
 			e1000_setup_fiber_serdes_link_82571;
-		func->check_for_link = e1000e_check_for_serdes_link;
+		func->check_for_link = e1000_check_for_serdes_link_82571;
 		func->get_link_up_info =
 			e1000e_get_speed_and_duplex_fiber_serdes;
 		break;
@@ -830,6 +831,10 @@ static s32 e1000_reset_hw_82571(struct e1000_hw *hw)
 		hw->dev_spec.e82571.alt_mac_addr_is_present)
 			e1000e_set_laa_state_82571(hw, true);
 
+	/* Reinitialize the 82571 serdes link state machine */
+	if (hw->phy.media_type == e1000_media_type_internal_serdes)
+		hw->mac.serdes_link_state = e1000_serdes_link_down;
+
 	return 0;
 }
 
@@ -1215,6 +1220,131 @@ static s32 e1000_setup_fiber_serdes_link_82571(struct e1000_hw *hw)
 }
 
 /**
+ *  e1000_check_for_serdes_link_82571 - Check for link (Serdes)
+ *  @hw: pointer to the HW structure
+ *
+ *  Checks for link up on the hardware.  If link is not up and we have
+ *  a signal, then we need to force link up.
+ **/
+s32 e1000_check_for_serdes_link_82571(struct e1000_hw *hw)
+{
+	struct e1000_mac_info *mac = &hw->mac;
+	u32 rxcw;
+	u32 ctrl;
+	u32 status;
+	s32 ret_val = 0;
+
+	ctrl = er32(CTRL);
+	status = er32(STATUS);
+	rxcw = er32(RXCW);
+
+	if ((rxcw & E1000_RXCW_SYNCH) && !(rxcw & E1000_RXCW_IV)) {
+
+		/* Receiver is synchronized with no invalid bits.  */
+		switch (mac->serdes_link_state) {
+		case e1000_serdes_link_autoneg_complete:
+			if (!(status & E1000_STATUS_LU)) {
+				/*
+				 * We have lost link, retry autoneg before
+				 * reporting link failure
+				 */
+				mac->serdes_link_state =
+				    e1000_serdes_link_autoneg_progress;
+				hw_dbg(hw, "AN_UP     -> AN_PROG\n");
+			}
+		break;
+
+		case e1000_serdes_link_forced_up:
+			/*
+			 * If we are receiving /C/ ordered sets, re-enable
+			 * auto-negotiation in the TXCW register and disable
+			 * forced link in the Device Control register in an
+			 * attempt to auto-negotiate with our link partner.
+			 */
+			if (rxcw & E1000_RXCW_C) {
+				/* Enable autoneg, and unforce link up */
+				ew32(TXCW, mac->txcw);
+				ew32(CTRL,
+				    (ctrl & ~E1000_CTRL_SLU));
+				mac->serdes_link_state =
+				    e1000_serdes_link_autoneg_progress;
+				hw_dbg(hw, "FORCED_UP -> AN_PROG\n");
+			}
+			break;
+
+		case e1000_serdes_link_autoneg_progress:
+			/*
+			 * If the LU bit is set in the STATUS register,
+			 * autoneg has completed sucessfully. If not,
+			 * try foring the link because the far end may be
+			 * available but not capable of autonegotiation.
+			 */
+			if (status & E1000_STATUS_LU)  {
+				mac->serdes_link_state =
+				    e1000_serdes_link_autoneg_complete;
+				hw_dbg(hw, "AN_PROG   -> AN_UP\n");
+			} else {
+				/*
+				 * Disable autoneg, force link up and
+				 * full duplex, and change state to forced
+				 */
+				ew32(TXCW,
+				    (mac->txcw & ~E1000_TXCW_ANE));
+				ctrl |= (E1000_CTRL_SLU | E1000_CTRL_FD);
+				ew32(CTRL, ctrl);
+
+				/* Configure Flow Control after link up. */
+				ret_val =
+				    e1000e_config_fc_after_link_up(hw);
+				if (ret_val) {
+					hw_dbg(hw, "Error config flow control\n");
+					break;
+				}
+				mac->serdes_link_state =
+				    e1000_serdes_link_forced_up;
+				hw_dbg(hw, "AN_PROG   -> FORCED_UP\n");
+			}
+			mac->serdes_has_link = true;
+			break;
+
+		case e1000_serdes_link_down:
+		default:
+			/* The link was down but the receiver has now gained
+			 * valid sync, so lets see if we can bring the link
+			 * up. */
+			ew32(TXCW, mac->txcw);
+			ew32(CTRL,
+			    (ctrl & ~E1000_CTRL_SLU));
+			mac->serdes_link_state =
+			    e1000_serdes_link_autoneg_progress;
+			hw_dbg(hw, "DOWN      -> AN_PROG\n");
+			break;
+		}
+	} else {
+		if (!(rxcw & E1000_RXCW_SYNCH)) {
+			mac->serdes_has_link = false;
+			mac->serdes_link_state = e1000_serdes_link_down;
+			hw_dbg(hw, "ANYSTATE  -> DOWN\n");
+		} else {
+			/*
+			 * We have sync, and can tolerate one
+			 * invalid (IV) codeword before declaring
+			 * link down, so reread to look again
+			 */
+			udelay(10);
+			rxcw = er32(RXCW);
+			if (rxcw & E1000_RXCW_IV) {
+				mac->serdes_link_state = e1000_serdes_link_down;
+				mac->serdes_has_link = false;
+				hw_dbg(hw, "ANYSTATE  -> DOWN\n");
+			}
+		}
+	}
+
+	return ret_val;
+}
+
+/**
  *  e1000_valid_led_default_82571 - Verify a valid default LED config
  *  @hw: pointer to the HW structure
  *  @data: pointer to the NVM (EEPROM)
diff --git a/drivers/net/e1000e/hw.h b/drivers/net/e1000e/hw.h
index 2d4ce04..5cb428c 100644
--- a/drivers/net/e1000e/hw.h
+++ b/drivers/net/e1000e/hw.h
@@ -459,6 +459,13 @@ enum e1000_smart_speed {
 	e1000_smart_speed_off
 };
 
+enum e1000_serdes_link_state {
+	e1000_serdes_link_down = 0,
+	e1000_serdes_link_autoneg_progress,
+	e1000_serdes_link_autoneg_complete,
+	e1000_serdes_link_forced_up
+};
+
 /* Receive Descriptor */
 struct e1000_rx_desc {
 	__le64 buffer_addr; /* Address of the descriptor's data buffer */
@@ -787,6 +794,7 @@ struct e1000_mac_info {
 	bool in_ifs_mode;
 	bool serdes_has_link;
 	bool tx_pkt_filtering;
+	enum e1000_serdes_link_state serdes_link_state;
 };
 
 struct e1000_phy_info {