ixgbe: cleanup crosstalk fix

This patch address a few issues with the initial crosstalk fix.  Most
important of which is the SDP that indicates the presents of a SFP+
module changes between HW types.  With this change that is taken in
to consideration

It also moves the check closer to the base code that checks link.  This
makes it so we only need to do the check in one spot.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe.h

@@ -804,8 +804,6 @@ struct ixgbe_adapter {
 
 #define IXGBE_RSS_KEY_SIZE     40  /* size of RSS Hash Key in bytes */
 	u32 rss_key[IXGBE_RSS_KEY_SIZE / sizeof(u32)];
-
-	bool need_crosstalk_fix;
 };
 
 static inline u8 ixgbe_max_rss_indices(struct ixgbe_adapter *adapter)

drivers/net/ethernet/intel/ixgbe/ixgbe_common.c

@@ -277,6 +277,7 @@ s32 ixgbe_start_hw_generic(struct ixgbe_hw *hw)
 {
 	s32 ret_val;
 	u32 ctrl_ext;
+	u16 device_caps;
 
 	/* Set the media type */
 	hw->phy.media_type = hw->mac.ops.get_media_type(hw);
@@ -301,6 +302,22 @@ s32 ixgbe_start_hw_generic(struct ixgbe_hw *hw)
 	if (ret_val)
 		return ret_val;
 
+	/* Cashe bit indicating need for crosstalk fix */
+	switch (hw->mac.type) {
+	case ixgbe_mac_82599EB:
+	case ixgbe_mac_X550EM_x:
+	case ixgbe_mac_x550em_a:
+		hw->mac.ops.get_device_caps(hw, &device_caps);
+		if (device_caps & IXGBE_DEVICE_CAPS_NO_CROSSTALK_WR)
+			hw->need_crosstalk_fix = false;
+		else
+			hw->need_crosstalk_fix = true;
+		break;
+	default:
+		hw->need_crosstalk_fix = false;
+		break;
+	}
+
 	/* Clear adapter stopped flag */
 	hw->adapter_stopped = false;
 
@@ -3199,6 +3216,31 @@ s32 ixgbe_clear_vfta_generic(struct ixgbe_hw *hw)
 	return 0;
 }
 
+/**
+ *  ixgbe_need_crosstalk_fix - Determine if we need to do cross talk fix
+ *  @hw: pointer to hardware structure
+ *
+ *  Contains the logic to identify if we need to verify link for the
+ *  crosstalk fix
+ **/
+static bool ixgbe_need_crosstalk_fix(struct ixgbe_hw *hw)
+{
+	/* Does FW say we need the fix */
+	if (!hw->need_crosstalk_fix)
+		return false;
+
+	/* Only consider SFP+ PHYs i.e. media type fiber */
+	switch (hw->mac.ops.get_media_type(hw)) {
+	case ixgbe_media_type_fiber:
+	case ixgbe_media_type_fiber_qsfp:
+		break;
+	default:
+		return false;
+	}
+
+	return true;
+}
+
 /**
  *  ixgbe_check_mac_link_generic - Determine link and speed status
  *  @hw: pointer to hardware structure
@@ -3214,6 +3256,35 @@ s32 ixgbe_check_mac_link_generic(struct ixgbe_hw *hw, ixgbe_link_speed *speed,
 	u32 links_reg, links_orig;
 	u32 i;
 
+	/* If Crosstalk fix enabled do the sanity check of making sure
+	 * the SFP+ cage is full.
+	 */
+	if (ixgbe_need_crosstalk_fix(hw)) {
+		u32 sfp_cage_full;
+
+		switch (hw->mac.type) {
+		case ixgbe_mac_82599EB:
+			sfp_cage_full = IXGBE_READ_REG(hw, IXGBE_ESDP) &
+					IXGBE_ESDP_SDP2;
+			break;
+		case ixgbe_mac_X550EM_x:
+		case ixgbe_mac_x550em_a:
+			sfp_cage_full = IXGBE_READ_REG(hw, IXGBE_ESDP) &
+					IXGBE_ESDP_SDP0;
+			break;
+		default:
+			/* sanity check - No SFP+ devices here */
+			sfp_cage_full = false;
+			break;
+		}
+
+		if (!sfp_cage_full) {
+			*link_up = false;
+			*speed = IXGBE_LINK_SPEED_UNKNOWN;
+			return 0;
+		}
+	}
+
 	/* clear the old state */
 	links_orig = IXGBE_READ_REG(hw, IXGBE_LINKS);
 

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

@@ -5625,7 +5625,6 @@ static int ixgbe_sw_init(struct ixgbe_adapter *adapter)
 	struct pci_dev *pdev = adapter->pdev;
 	unsigned int rss, fdir;
 	u32 fwsm;
-	u16 device_caps;
 	int i;
 
 	/* PCI config space info */
@@ -5771,22 +5770,6 @@ static int ixgbe_sw_init(struct ixgbe_adapter *adapter)
 	adapter->tx_ring_count = IXGBE_DEFAULT_TXD;
 	adapter->rx_ring_count = IXGBE_DEFAULT_RXD;
 
-	/* Cache bit indicating need for crosstalk fix */
-	switch (hw->mac.type) {
-	case ixgbe_mac_82599EB:
-	case ixgbe_mac_X550EM_x:
-	case ixgbe_mac_x550em_a:
-		hw->mac.ops.get_device_caps(hw, &device_caps);
-		if (device_caps & IXGBE_DEVICE_CAPS_NO_CROSSTALK_WR)
-			adapter->need_crosstalk_fix = false;
-		else
-			adapter->need_crosstalk_fix = true;
-		break;
-	default:
-		adapter->need_crosstalk_fix = false;
-		break;
-	}
-
 	/* set default work limits */
 	adapter->tx_work_limit = IXGBE_DEFAULT_TX_WORK;
 
@@ -6707,18 +6690,6 @@ static void ixgbe_watchdog_update_link(struct ixgbe_adapter *adapter)
 		link_up = true;
 	}
 
-	/* If Crosstalk fix enabled do the sanity check of making sure
-	 * the SFP+ cage is empty.
-	 */
-	if (adapter->need_crosstalk_fix) {
-		u32 sfp_cage_full;
-
-		sfp_cage_full = IXGBE_READ_REG(hw, IXGBE_ESDP) &
-				IXGBE_ESDP_SDP2;
-		if (ixgbe_is_sfp(hw) && link_up && !sfp_cage_full)
-			link_up = false;
-	}
-
 	if (adapter->ixgbe_ieee_pfc)
 		pfc_en |= !!(adapter->ixgbe_ieee_pfc->pfc_en);
 
@@ -7065,16 +7036,6 @@ static void ixgbe_sfp_detection_subtask(struct ixgbe_adapter *adapter)
 	struct ixgbe_hw *hw = &adapter->hw;
 	s32 err;
 
-	/* If crosstalk fix enabled verify the SFP+ cage is full */
-	if (adapter->need_crosstalk_fix) {
-		u32 sfp_cage_full;
-
-		sfp_cage_full = IXGBE_READ_REG(hw, IXGBE_ESDP) &
-				IXGBE_ESDP_SDP2;
-		if (!sfp_cage_full)
-			return;
-	}
-
 	/* not searching for SFP so there is nothing to do here */
 	if (!(adapter->flags2 & IXGBE_FLAG2_SEARCH_FOR_SFP) &&
 	    !(adapter->flags2 & IXGBE_FLAG2_SFP_NEEDS_RESET))

drivers/net/ethernet/intel/ixgbe/ixgbe_type.h

@@ -3525,6 +3525,7 @@ struct ixgbe_hw {
 	bool				force_full_reset;
 	bool				allow_unsupported_sfp;
 	bool				wol_enabled;
+	bool				need_crosstalk_fix;
 };
 
 struct ixgbe_info {