Merge branch '1GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue

Jeff Kirsher says:

====================
1GbE Intel Wired LAN Driver Updates 2015-12-14

This series contains updates to e1000e and igb.

Alex Duyck changes e1000_up() to void since it always returned 0, also
by making it void, we can drop some code since we no longer have to worry
about non-zero return values.

Aaron Sierra removes GS40G specific defines and functions since the i210
internal PHY can be accessed with the access functions shared by 82580,
i350 and i354 devices.  Also removes the code to add the PHY address into
the PCDL register address, since there is no real reason to do so.

Joe updates the cable length function reports all four pairs true min, max
and average cable length for i210.  Also updated ethtool to use enum-based
labels instead of hard coded values.

Benjamin Poirier cleans up code that is never reachable since MSI-X
interrupts are not shared in e1000e.  Also removes the ICR read in the
other interrupt handler, since the information is not needed and IMS is
configured such that the only link status change can trigger the other
interrupt handler.  Fixed in MSI-X mode, there is no handler for the LSC
interrupt so there is no point in writing that to ICS now that we always
assume other interrupts are caused by LSC.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/intel/e1000e/defines.h

@@ -441,12 +441,13 @@
 #define E1000_IMS_RXQ1      E1000_ICR_RXQ1      /* Rx Queue 1 Interrupt */
 #define E1000_IMS_TXQ0      E1000_ICR_TXQ0      /* Tx Queue 0 Interrupt */
 #define E1000_IMS_TXQ1      E1000_ICR_TXQ1      /* Tx Queue 1 Interrupt */
-#define E1000_IMS_OTHER     E1000_ICR_OTHER     /* Other Interrupts */
+#define E1000_IMS_OTHER     E1000_ICR_OTHER     /* Other Interrupt */
 
 /* Interrupt Cause Set */
 #define E1000_ICS_LSC       E1000_ICR_LSC       /* Link Status Change */
 #define E1000_ICS_RXSEQ     E1000_ICR_RXSEQ     /* Rx sequence error */
 #define E1000_ICS_RXDMT0    E1000_ICR_RXDMT0    /* Rx desc min. threshold */
+#define E1000_ICS_OTHER     E1000_ICR_OTHER     /* Other Interrupt */
 
 /* Transmit Descriptor Control */
 #define E1000_TXDCTL_PTHRESH 0x0000003F /* TXDCTL Prefetch Threshold */

drivers/net/ethernet/intel/e1000e/e1000.h

@@ -480,7 +480,7 @@ extern const char e1000e_driver_version[];
 void e1000e_check_options(struct e1000_adapter *adapter);
 void e1000e_set_ethtool_ops(struct net_device *netdev);
 
-int e1000e_up(struct e1000_adapter *adapter);
+void e1000e_up(struct e1000_adapter *adapter);
 void e1000e_down(struct e1000_adapter *adapter, bool reset);
 void e1000e_reinit_locked(struct e1000_adapter *adapter);
 void e1000e_reset(struct e1000_adapter *adapter);

drivers/net/ethernet/intel/e1000e/netdev.c

@@ -1905,30 +1905,15 @@ static irqreturn_t e1000_msix_other(int __always_unused irq, void *data)
 	struct net_device *netdev = data;
 	struct e1000_adapter *adapter = netdev_priv(netdev);
 	struct e1000_hw *hw = &adapter->hw;
-	u32 icr = er32(ICR);
-
-	if (!(icr & E1000_ICR_INT_ASSERTED)) {
-		if (!test_bit(__E1000_DOWN, &adapter->state))
-			ew32(IMS, E1000_IMS_OTHER);
-		return IRQ_NONE;
-	}
 
-	if (icr & adapter->eiac_mask)
-		ew32(ICS, (icr & adapter->eiac_mask));
+	hw->mac.get_link_status = true;
 
-	if (icr & E1000_ICR_OTHER) {
-		if (!(icr & E1000_ICR_LSC))
-			goto no_link_interrupt;
-		hw->mac.get_link_status = true;
-		/* guard against interrupt when we're going down */
-		if (!test_bit(__E1000_DOWN, &adapter->state))
-			mod_timer(&adapter->watchdog_timer, jiffies + 1);
+	/* guard against interrupt when we're going down */
+	if (!test_bit(__E1000_DOWN, &adapter->state)) {
+		mod_timer(&adapter->watchdog_timer, jiffies + 1);
+		ew32(IMS, E1000_IMS_OTHER);
 	}
 
-no_link_interrupt:
-	if (!test_bit(__E1000_DOWN, &adapter->state))
-		ew32(IMS, E1000_IMS_LSC | E1000_IMS_OTHER);
-
 	return IRQ_HANDLED;
 }
 
@@ -1946,6 +1931,9 @@ static irqreturn_t e1000_intr_msix_tx(int __always_unused irq, void *data)
 		/* Ring was not completely cleaned, so fire another interrupt */
 		ew32(ICS, tx_ring->ims_val);
 
+	if (!test_bit(__E1000_DOWN, &adapter->state))
+		ew32(IMS, adapter->tx_ring->ims_val);
+
 	return IRQ_HANDLED;
 }
 
@@ -2027,6 +2015,7 @@ static void e1000_configure_msix(struct e1000_adapter *adapter)
 		       hw->hw_addr + E1000_EITR_82574(vector));
 	else
 		writel(1, hw->hw_addr + E1000_EITR_82574(vector));
+	adapter->eiac_mask |= E1000_IMS_OTHER;
 
 	/* Cause Tx interrupts on every write back */
 	ivar |= (1 << 31);
@@ -2034,12 +2023,8 @@ static void e1000_configure_msix(struct e1000_adapter *adapter)
 	ew32(IVAR, ivar);
 
 	/* enable MSI-X PBA support */
-	ctrl_ext = er32(CTRL_EXT);
-	ctrl_ext |= E1000_CTRL_EXT_PBA_CLR;
-
-	/* Auto-Mask Other interrupts upon ICR read */
-	ew32(IAM, ~E1000_EIAC_MASK_82574 | E1000_IMS_OTHER);
-	ctrl_ext |= E1000_CTRL_EXT_EIAME;
+	ctrl_ext = er32(CTRL_EXT) & ~E1000_CTRL_EXT_IAME;
+	ctrl_ext |= E1000_CTRL_EXT_PBA_CLR | E1000_CTRL_EXT_EIAME;
 	ew32(CTRL_EXT, ctrl_ext);
 	e1e_flush();
 }
@@ -2255,7 +2240,7 @@ static void e1000_irq_enable(struct e1000_adapter *adapter)
 
 	if (adapter->msix_entries) {
 		ew32(EIAC_82574, adapter->eiac_mask & E1000_EIAC_MASK_82574);
-		ew32(IMS, adapter->eiac_mask | E1000_IMS_OTHER | E1000_IMS_LSC);
+		ew32(IMS, adapter->eiac_mask | E1000_IMS_LSC);
 	} else if ((hw->mac.type == e1000_pch_lpt) ||
 		   (hw->mac.type == e1000_pch_spt)) {
 		ew32(IMS, IMS_ENABLE_MASK | E1000_IMS_ECCER);
@@ -4146,10 +4131,24 @@ void e1000e_reset(struct e1000_adapter *adapter)
 
 }
 
-int e1000e_up(struct e1000_adapter *adapter)
+/**
+ * e1000e_trigger_lsc - trigger an LSC interrupt
+ * @adapter: 
+ *
+ * Fire a link status change interrupt to start the watchdog.
+ **/
+static void e1000e_trigger_lsc(struct e1000_adapter *adapter)
 {
 	struct e1000_hw *hw = &adapter->hw;
 
+	if (adapter->msix_entries)
+		ew32(ICS, E1000_ICS_OTHER);
+	else
+		ew32(ICS, E1000_ICS_LSC);
+}
+
+void e1000e_up(struct e1000_adapter *adapter)
+{
 	/* hardware has been reset, we need to reload some things */
 	e1000_configure(adapter);
 
@@ -4161,13 +4160,7 @@ int e1000e_up(struct e1000_adapter *adapter)
 
 	netif_start_queue(adapter->netdev);
 
-	/* fire a link change interrupt to start the watchdog */
-	if (adapter->msix_entries)
-		ew32(ICS, E1000_ICS_LSC | E1000_ICR_OTHER);
-	else
-		ew32(ICS, E1000_ICS_LSC);
-
-	return 0;
+	e1000e_trigger_lsc(adapter);
 }
 
 static void e1000e_flush_descriptors(struct e1000_adapter *adapter)
@@ -4592,11 +4585,7 @@ static int e1000_open(struct net_device *netdev)
 	hw->mac.get_link_status = true;
 	pm_runtime_put(&pdev->dev);
 
-	/* fire a link status change interrupt to start the watchdog */
-	if (adapter->msix_entries)
-		ew32(ICS, E1000_ICS_LSC | E1000_ICR_OTHER);
-	else
-		ew32(ICS, E1000_ICS_LSC);
+	e1000e_trigger_lsc(adapter);
 
 	return 0;
 
@@ -6633,7 +6622,7 @@ static int e1000e_pm_runtime_resume(struct device *dev)
 		return rc;
 
 	if (netdev->flags & IFF_UP)
-		rc = e1000e_up(adapter);
+		e1000e_up(adapter);
 
 	return rc;
 }
@@ -6824,13 +6813,8 @@ static void e1000_io_resume(struct pci_dev *pdev)
 
 	e1000_init_manageability_pt(adapter);
 
-	if (netif_running(netdev)) {
-		if (e1000e_up(adapter)) {
-			dev_err(&pdev->dev,
-				"can't bring device back up after reset\n");
-			return;
-		}
-	}
+	if (netif_running(netdev))
+		e1000e_up(adapter);
 
 	netif_device_attach(netdev);
 

drivers/net/ethernet/intel/igb/e1000_82575.c

@@ -45,8 +45,6 @@ static s32  igb_get_cfg_done_82575(struct e1000_hw *);
 static s32  igb_init_hw_82575(struct e1000_hw *);
 static s32  igb_phy_hw_reset_sgmii_82575(struct e1000_hw *);
 static s32  igb_read_phy_reg_sgmii_82575(struct e1000_hw *, u32, u16 *);
-static s32  igb_read_phy_reg_82580(struct e1000_hw *, u32, u16 *);
-static s32  igb_write_phy_reg_82580(struct e1000_hw *, u32, u16);
 static s32  igb_reset_hw_82575(struct e1000_hw *);
 static s32  igb_reset_hw_82580(struct e1000_hw *);
 static s32  igb_set_d0_lplu_state_82575(struct e1000_hw *, bool);
@@ -205,13 +203,10 @@ static s32 igb_init_phy_params_82575(struct e1000_hw *hw)
 		case e1000_82580:
 		case e1000_i350:
 		case e1000_i354:
-			phy->ops.read_reg = igb_read_phy_reg_82580;
-			phy->ops.write_reg = igb_write_phy_reg_82580;
-			break;
 		case e1000_i210:
 		case e1000_i211:
-			phy->ops.read_reg = igb_read_phy_reg_gs40g;
-			phy->ops.write_reg = igb_write_phy_reg_gs40g;
+			phy->ops.read_reg = igb_read_phy_reg_82580;
+			phy->ops.write_reg = igb_write_phy_reg_82580;
 			break;
 		default:
 			phy->ops.read_reg = igb_read_phy_reg_igp;
@@ -2153,7 +2148,7 @@ void igb_vmdq_set_replication_pf(struct e1000_hw *hw, bool enable)
  *  Reads the MDI control register in the PHY at offset and stores the
  *  information read to data.
  **/
-static s32 igb_read_phy_reg_82580(struct e1000_hw *hw, u32 offset, u16 *data)
+s32 igb_read_phy_reg_82580(struct e1000_hw *hw, u32 offset, u16 *data)
 {
 	s32 ret_val;
 
@@ -2177,7 +2172,7 @@ static s32 igb_read_phy_reg_82580(struct e1000_hw *hw, u32 offset, u16 *data)
  *
  *  Writes data to MDI control register in the PHY at offset.
  **/
-static s32 igb_write_phy_reg_82580(struct e1000_hw *hw, u32 offset, u16 data)
+s32 igb_write_phy_reg_82580(struct e1000_hw *hw, u32 offset, u16 data)
 {
 	s32 ret_val;
 

drivers/net/ethernet/intel/igb/e1000_defines.h

@@ -927,7 +927,10 @@
 
 /* Intel i347-AT4 Registers */
 
-#define I347AT4_PCDL                   0x10 /* PHY Cable Diagnostics Length */
+#define I347AT4_PCDL0                  0x10 /* Pair 0 PHY Cable Diagnostics Length */
+#define I347AT4_PCDL1                  0x11 /* Pair 1 PHY Cable Diagnostics Length */
+#define I347AT4_PCDL2                  0x12 /* Pair 2 PHY Cable Diagnostics Length */
+#define I347AT4_PCDL3                  0x13 /* Pair 3 PHY Cable Diagnostics Length */
 #define I347AT4_PCDC                   0x15 /* PHY Cable Diagnostics Control */
 #define I347AT4_PAGE_SELECT            0x16
 

drivers/net/ethernet/intel/igb/e1000_hw.h

@@ -441,6 +441,7 @@ struct e1000_phy_info {
 	u16 cable_length;
 	u16 max_cable_length;
 	u16 min_cable_length;
+	u16 pair_length[4];
 
 	u8 mdix;
 

drivers/net/ethernet/intel/igb/e1000_i210.c

@@ -861,10 +861,10 @@ s32 igb_pll_workaround_i210(struct e1000_hw *hw)
 	if (ret_val)
 		nvm_word = E1000_INVM_DEFAULT_AL;
 	tmp_nvm = nvm_word | E1000_INVM_PLL_WO_VAL;
+	igb_write_phy_reg_82580(hw, I347AT4_PAGE_SELECT, E1000_PHY_PLL_FREQ_PAGE);
 	for (i = 0; i < E1000_MAX_PLL_TRIES; i++) {
 		/* check current state directly from internal PHY */
-		igb_read_phy_reg_gs40g(hw, (E1000_PHY_PLL_FREQ_PAGE |
-					 E1000_PHY_PLL_FREQ_REG), &phy_word);
+		igb_read_phy_reg_82580(hw, E1000_PHY_PLL_FREQ_REG, &phy_word);
 		if ((phy_word & E1000_PHY_PLL_UNCONF)
 		    != E1000_PHY_PLL_UNCONF) {
 			ret_val = 0;
@@ -896,6 +896,7 @@ s32 igb_pll_workaround_i210(struct e1000_hw *hw)
 		/* restore WUC register */
 		wr32(E1000_WUC, wuc);
 	}
+	igb_write_phy_reg_82580(hw, I347AT4_PAGE_SELECT, 0);
 	/* restore MDICNFG setting */
 	wr32(E1000_MDICNFG, mdicnfg);
 	return ret_val;

drivers/net/ethernet/intel/igb/e1000_i210.h

@@ -85,7 +85,7 @@ enum E1000_INVM_STRUCTURE_TYPE {
 #define E1000_PCI_PMCSR_D3		0x03
 #define E1000_MAX_PLL_TRIES		5
 #define E1000_PHY_PLL_UNCONF		0xFF
-#define E1000_PHY_PLL_FREQ_PAGE		0xFC0000
+#define E1000_PHY_PLL_FREQ_PAGE		0xFC
 #define E1000_PHY_PLL_FREQ_REG		0x000E
 #define E1000_INVM_DEFAULT_AL		0x202F
 #define E1000_INVM_AUTOLOAD		0x0A

drivers/net/ethernet/intel/igb/e1000_phy.c

@@ -1717,59 +1717,76 @@ s32 igb_get_cable_length_m88_gen2(struct e1000_hw *hw)
 	struct e1000_phy_info *phy = &hw->phy;
 	s32 ret_val;
 	u16 phy_data, phy_data2, index, default_page, is_cm;
+	int len_tot = 0;
+	u16 len_min;
+	u16 len_max;
 
 	switch (hw->phy.id) {
+	case M88E1543_E_PHY_ID:
+	case M88E1512_E_PHY_ID:
+	case I347AT4_E_PHY_ID:
 	case I210_I_PHY_ID:
-		/* Get cable length from PHY Cable Diagnostics Control Reg */
-		ret_val = phy->ops.read_reg(hw, (0x7 << GS40G_PAGE_SHIFT) +
-					    (I347AT4_PCDL + phy->addr),
-					    &phy_data);
+		/* Remember the original page select and set it to 7 */
+		ret_val = phy->ops.read_reg(hw, I347AT4_PAGE_SELECT,
+					    &default_page);
 		if (ret_val)
-			return ret_val;
+			goto out;
+
+		ret_val = phy->ops.write_reg(hw, I347AT4_PAGE_SELECT, 0x07);
+		if (ret_val)
+			goto out;
 
 		/* Check if the unit of cable length is meters or cm */
-		ret_val = phy->ops.read_reg(hw, (0x7 << GS40G_PAGE_SHIFT) +
-					    I347AT4_PCDC, &phy_data2);
+		ret_val = phy->ops.read_reg(hw, I347AT4_PCDC, &phy_data2);
 		if (ret_val)
-			return ret_val;
+			goto out;
 
 		is_cm = !(phy_data2 & I347AT4_PCDC_CABLE_LENGTH_UNIT);
 
-		/* Populate the phy structure with cable length in meters */
-		phy->min_cable_length = phy_data / (is_cm ? 100 : 1);
-		phy->max_cable_length = phy_data / (is_cm ? 100 : 1);
-		phy->cable_length = phy_data / (is_cm ? 100 : 1);
-		break;
-	case M88E1543_E_PHY_ID:
-	case M88E1512_E_PHY_ID:
-	case I347AT4_E_PHY_ID:
-		/* Remember the original page select and set it to 7 */
-		ret_val = phy->ops.read_reg(hw, I347AT4_PAGE_SELECT,
-					    &default_page);
+		/* Get cable length from Pair 0 length Regs */
+		ret_val = phy->ops.read_reg(hw, I347AT4_PCDL0, &phy_data);
 		if (ret_val)
 			goto out;
 
-		ret_val = phy->ops.write_reg(hw, I347AT4_PAGE_SELECT, 0x07);
+		phy->pair_length[0] = phy_data / (is_cm ? 100 : 1);
+		len_tot = phy->pair_length[0];
+		len_min = phy->pair_length[0];
+		len_max = phy->pair_length[0];
+
+		/* Get cable length from Pair 1 length Regs */
+		ret_val = phy->ops.read_reg(hw, I347AT4_PCDL1, &phy_data);
 		if (ret_val)
 			goto out;
 
-		/* Get cable length from PHY Cable Diagnostics Control Reg */
-		ret_val = phy->ops.read_reg(hw, (I347AT4_PCDL + phy->addr),
-					    &phy_data);
+		phy->pair_length[1] = phy_data / (is_cm ? 100 : 1);
+		len_tot += phy->pair_length[1];
+		len_min = min(len_min, phy->pair_length[1]);
+		len_max = max(len_max, phy->pair_length[1]);
+
+		/* Get cable length from Pair 2 length Regs */
+		ret_val = phy->ops.read_reg(hw, I347AT4_PCDL2, &phy_data);
 		if (ret_val)
 			goto out;
 
-		/* Check if the unit of cable length is meters or cm */
-		ret_val = phy->ops.read_reg(hw, I347AT4_PCDC, &phy_data2);
+		phy->pair_length[2] = phy_data / (is_cm ? 100 : 1);
+		len_tot += phy->pair_length[2];
+		len_min = min(len_min, phy->pair_length[2]);
+		len_max = max(len_max, phy->pair_length[2]);
+
+		/* Get cable length from Pair 3 length Regs */
+		ret_val = phy->ops.read_reg(hw, I347AT4_PCDL3, &phy_data);
 		if (ret_val)
 			goto out;
 
-		is_cm = !(phy_data2 & I347AT4_PCDC_CABLE_LENGTH_UNIT);
+		phy->pair_length[3] = phy_data / (is_cm ? 100 : 1);
+		len_tot += phy->pair_length[3];
+		len_min = min(len_min, phy->pair_length[3]);
+		len_max = max(len_max, phy->pair_length[3]);
 
 		/* Populate the phy structure with cable length in meters */
-		phy->min_cable_length = phy_data / (is_cm ? 100 : 1);
-		phy->max_cable_length = phy_data / (is_cm ? 100 : 1);
-		phy->cable_length = phy_data / (is_cm ? 100 : 1);
+		phy->min_cable_length = len_min;
+		phy->max_cable_length = len_max;
+		phy->cable_length = len_tot / 4;
 
 		/* Reset the page selec to its original value */
 		ret_val = phy->ops.write_reg(hw, I347AT4_PAGE_SELECT,
@@ -2587,66 +2604,6 @@ s32 igb_get_cable_length_82580(struct e1000_hw *hw)
 	return ret_val;
 }
 
-/**
- *  igb_write_phy_reg_gs40g - Write GS40G PHY register
- *  @hw: pointer to the HW structure
- *  @offset: lower half is register offset to write to
- *     upper half is page to use.
- *  @data: data to write at register offset
- *
- *  Acquires semaphore, if necessary, then writes the data to PHY register
- *  at the offset.  Release any acquired semaphores before exiting.
- **/
-s32 igb_write_phy_reg_gs40g(struct e1000_hw *hw, u32 offset, u16 data)
-{
-	s32 ret_val;
-	u16 page = offset >> GS40G_PAGE_SHIFT;
-
-	offset = offset & GS40G_OFFSET_MASK;
-	ret_val = hw->phy.ops.acquire(hw);
-	if (ret_val)
-		return ret_val;
-
-	ret_val = igb_write_phy_reg_mdic(hw, GS40G_PAGE_SELECT, page);
-	if (ret_val)
-		goto release;
-	ret_val = igb_write_phy_reg_mdic(hw, offset, data);
-
-release:
-	hw->phy.ops.release(hw);
-	return ret_val;
-}
-
-/**
- *  igb_read_phy_reg_gs40g - Read GS40G  PHY register
- *  @hw: pointer to the HW structure
- *  @offset: lower half is register offset to read to
- *     upper half is page to use.
- *  @data: data to read at register offset
- *
- *  Acquires semaphore, if necessary, then reads the data in the PHY register
- *  at the offset.  Release any acquired semaphores before exiting.
- **/
-s32 igb_read_phy_reg_gs40g(struct e1000_hw *hw, u32 offset, u16 *data)
-{
-	s32 ret_val;
-	u16 page = offset >> GS40G_PAGE_SHIFT;
-
-	offset = offset & GS40G_OFFSET_MASK;
-	ret_val = hw->phy.ops.acquire(hw);
-	if (ret_val)
-		return ret_val;
-
-	ret_val = igb_write_phy_reg_mdic(hw, GS40G_PAGE_SELECT, page);
-	if (ret_val)
-		goto release;
-	ret_val = igb_read_phy_reg_mdic(hw, offset, data);
-
-release:
-	hw->phy.ops.release(hw);
-	return ret_val;
-}
-
 /**
  *  igb_set_master_slave_mode - Setup PHY for Master/slave mode
  *  @hw: pointer to the HW structure

drivers/net/ethernet/intel/igb/e1000_phy.h

@@ -72,8 +72,8 @@ s32  igb_copper_link_setup_82580(struct e1000_hw *hw);
 s32  igb_get_phy_info_82580(struct e1000_hw *hw);
 s32  igb_phy_force_speed_duplex_82580(struct e1000_hw *hw);
 s32  igb_get_cable_length_82580(struct e1000_hw *hw);
-s32  igb_read_phy_reg_gs40g(struct e1000_hw *hw, u32 offset, u16 *data);
-s32  igb_write_phy_reg_gs40g(struct e1000_hw *hw, u32 offset, u16 data);
+s32  igb_read_phy_reg_82580(struct e1000_hw *hw, u32 offset, u16 *data);
+s32  igb_write_phy_reg_82580(struct e1000_hw *hw, u32 offset, u16 data);
 s32  igb_check_polarity_m88(struct e1000_hw *hw);
 
 /* IGP01E1000 Specific Registers */
@@ -144,17 +144,6 @@ s32  igb_check_polarity_m88(struct e1000_hw *hw);
 
 #define E1000_CABLE_LENGTH_UNDEFINED      0xFF
 
-/* GS40G - I210 PHY defines */
-#define GS40G_PAGE_SELECT		0x16
-#define GS40G_PAGE_SHIFT		16
-#define GS40G_OFFSET_MASK		0xFFFF
-#define GS40G_PAGE_2			0x20000
-#define GS40G_MAC_REG2			0x15
-#define GS40G_MAC_LB			0x4140
-#define GS40G_MAC_SPEED_1G		0X0006
-#define GS40G_COPPER_SPEC		0x0010
-#define GS40G_LINE_LB			0x4000
-
 /* SFP modules ID memory locations */
 #define E1000_SFF_IDENTIFIER_OFFSET	0x00
 #define E1000_SFF_IDENTIFIER_SFF	0x02

drivers/net/ethernet/intel/igb/igb_ethtool.c

@@ -127,10 +127,20 @@ static const struct igb_stats igb_gstrings_net_stats[] = {
 #define IGB_STATS_LEN \
 	(IGB_GLOBAL_STATS_LEN + IGB_NETDEV_STATS_LEN + IGB_QUEUE_STATS_LEN)
 
+enum igb_diagnostics_results {
+	TEST_REG = 0,
+	TEST_EEP,
+	TEST_IRQ,
+	TEST_LOOP,
+	TEST_LINK
+};
+
 static const char igb_gstrings_test[][ETH_GSTRING_LEN] = {
-	"Register test  (offline)", "Eeprom test    (offline)",
-	"Interrupt test (offline)", "Loopback test  (offline)",
-	"Link test   (on/offline)"
+	[TEST_REG]  = "Register test  (offline)",
+	[TEST_EEP]  = "Eeprom test    (offline)",
+	[TEST_IRQ]  = "Interrupt test (offline)",
+	[TEST_LOOP] = "Loopback test  (offline)",
+	[TEST_LINK] = "Link test   (on/offline)"
 };
 #define IGB_TEST_LEN (sizeof(igb_gstrings_test) / ETH_GSTRING_LEN)
 
@@ -2002,7 +2012,7 @@ static void igb_diag_test(struct net_device *netdev,
 		/* Link test performed before hardware reset so autoneg doesn't
 		 * interfere with test result
 		 */
-		if (igb_link_test(adapter, &data[4]))
+		if (igb_link_test(adapter, &data[TEST_LINK]))
 			eth_test->flags |= ETH_TEST_FL_FAILED;
 
 		if (if_running)
@@ -2011,21 +2021,21 @@ static void igb_diag_test(struct net_device *netdev,
 		else
 			igb_reset(adapter);
 
-		if (igb_reg_test(adapter, &data[0]))
+		if (igb_reg_test(adapter, &data[TEST_REG]))
 			eth_test->flags |= ETH_TEST_FL_FAILED;
 
 		igb_reset(adapter);
-		if (igb_eeprom_test(adapter, &data[1]))
+		if (igb_eeprom_test(adapter, &data[TEST_EEP]))
 			eth_test->flags |= ETH_TEST_FL_FAILED;
 
 		igb_reset(adapter);
-		if (igb_intr_test(adapter, &data[2]))
+		if (igb_intr_test(adapter, &data[TEST_IRQ]))
 			eth_test->flags |= ETH_TEST_FL_FAILED;
 
 		igb_reset(adapter);
 		/* power up link for loopback test */
 		igb_power_up_link(adapter);
-		if (igb_loopback_test(adapter, &data[3]))
+		if (igb_loopback_test(adapter, &data[TEST_LOOP]))
 			eth_test->flags |= ETH_TEST_FL_FAILED;
 
 		/* restore speed, duplex, autoneg settings */
@@ -2045,16 +2055,16 @@ static void igb_diag_test(struct net_device *netdev,
 		dev_info(&adapter->pdev->dev, "online testing starting\n");
 
 		/* PHY is powered down when interface is down */
-		if (if_running && igb_link_test(adapter, &data[4]))
+		if (if_running && igb_link_test(adapter, &data[TEST_LINK]))
 			eth_test->flags |= ETH_TEST_FL_FAILED;
 		else
-			data[4] = 0;
+			data[TEST_LINK] = 0;
 
 		/* Online tests aren't run; pass by default */
-		data[0] = 0;
-		data[1] = 0;
-		data[2] = 0;
-		data[3] = 0;
+		data[TEST_REG] = 0;
+		data[TEST_EEP] = 0;
+		data[TEST_IRQ] = 0;
+		data[TEST_LOOP] = 0;
 
 		clear_bit(__IGB_TESTING, &adapter->state);
 	}