4 files changed, 68 insertions, 28 deletions

diff --git a/drivers/net/ethernet/intel/e1000e/e1000.h b/drivers/net/ethernet/intel/e1000e/e1000.h
index 018e61aea787..aa08f397988e 100644
--- a/drivers/net/ethernet/intel/e1000e/e1000.h
+++ b/drivers/net/ethernet/intel/e1000e/e1000.h
@@ -461,6 +461,7 @@ s32 e1000e_get_base_timinca(struct e1000_adapter *adapter, u32 *timinca);
 #define FLAG2_CHECK_RX_HWTSTAMP           BIT(13)
 #define FLAG2_CHECK_SYSTIM_OVERFLOW       BIT(14)
 #define FLAG2_ENABLE_S0IX_FLOWS           BIT(15)
+#define FLAG2_DISABLE_K1		   BIT(16)
 
 #define E1000_RX_DESC_PS(R, i)	    \
 	(&(((union e1000_rx_desc_packet_split *)((R).desc))[i]))
diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
index 8e40bb50a01e..7b1ac90b3de4 100644
--- a/drivers/net/ethernet/intel/e1000e/ethtool.c
+++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
@@ -26,6 +26,8 @@ struct e1000_stats {
 static const char e1000e_priv_flags_strings[][ETH_GSTRING_LEN] = {
 #define E1000E_PRIV_FLAGS_S0IX_ENABLED	BIT(0)
 	"s0ix-enabled",
+#define E1000E_PRIV_FLAGS_DISABLE_K1	BIT(1)
+	"disable-k1",
 };
 
 #define E1000E_PRIV_FLAGS_STR_LEN ARRAY_SIZE(e1000e_priv_flags_strings)
@@ -549,9 +551,9 @@ static int e1000_set_eeprom(struct net_device *netdev,
 {
 	struct e1000_adapter *adapter = netdev_priv(netdev);
 	struct e1000_hw *hw = &adapter->hw;
-	size_t total_len, max_len;
 	u16 *eeprom_buff;
 	int ret_val = 0;
+	size_t max_len;
 	int first_word;
 	int last_word;
 	void *ptr;
@@ -569,10 +571,6 @@ static int e1000_set_eeprom(struct net_device *netdev,
 
 	max_len = hw->nvm.word_size * 2;
 
-	if (check_add_overflow(eeprom->offset, eeprom->len, &total_len) ||
-	    total_len > max_len)
-		return -EFBIG;
-
 	first_word = eeprom->offset >> 1;
 	last_word = (eeprom->offset + eeprom->len - 1) >> 1;
 	eeprom_buff = kmalloc(max_len, GFP_KERNEL);
@@ -2301,26 +2299,59 @@ static u32 e1000e_get_priv_flags(struct net_device *netdev)
 	if (adapter->flags2 & FLAG2_ENABLE_S0IX_FLOWS)
 		priv_flags |= E1000E_PRIV_FLAGS_S0IX_ENABLED;
 
+	if (adapter->flags2 & FLAG2_DISABLE_K1)
+		priv_flags |= E1000E_PRIV_FLAGS_DISABLE_K1;
+
 	return priv_flags;
 }
 
 static int e1000e_set_priv_flags(struct net_device *netdev, u32 priv_flags)
 {
 	struct e1000_adapter *adapter = netdev_priv(netdev);
+	struct e1000_hw *hw = &adapter->hw;
 	unsigned int flags2 = adapter->flags2;
+	unsigned int changed;
 
-	flags2 &= ~FLAG2_ENABLE_S0IX_FLOWS;
-	if (priv_flags & E1000E_PRIV_FLAGS_S0IX_ENABLED) {
-		struct e1000_hw *hw = &adapter->hw;
+	flags2 &= ~(FLAG2_ENABLE_S0IX_FLOWS | FLAG2_DISABLE_K1);
 
-		if (hw->mac.type < e1000_pch_cnp)
+	if (priv_flags & E1000E_PRIV_FLAGS_S0IX_ENABLED) {
+		if (hw->mac.type < e1000_pch_cnp) {
+			e_err("S0ix is not supported on this device\n");
 			return -EINVAL;
+		}
+
 		flags2 |= FLAG2_ENABLE_S0IX_FLOWS;
 	}
 
-	if (flags2 != adapter->flags2)
+	if (priv_flags & E1000E_PRIV_FLAGS_DISABLE_K1) {
+		if (hw->mac.type < e1000_ich8lan) {
+			e_err("Disabling K1 is not supported on this device\n");
+			return -EINVAL;
+		}
+
+		flags2 |= FLAG2_DISABLE_K1;
+	}
+
+	changed = adapter->flags2 ^ flags2;
+	if (changed)
 		adapter->flags2 = flags2;
 
+	if (changed & FLAG2_DISABLE_K1) {
+		/* reset the hardware to apply the changes */
+		while (test_and_set_bit(__E1000_RESETTING,
+					&adapter->state))
+			usleep_range(1000, 2000);
+
+		if (netif_running(adapter->netdev)) {
+			e1000e_down(adapter, true);
+			e1000e_up(adapter);
+		} else {
+			e1000e_reset(adapter);
+		}
+
+		clear_bit(__E1000_RESETTING, &adapter->state);
+	}
+
 	return 0;
 }
 
diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c b/drivers/net/ethernet/intel/e1000e/ich8lan.c
index df4e7d781cb1..0ff8688ac3b8 100644
--- a/drivers/net/ethernet/intel/e1000e/ich8lan.c
+++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c
@@ -286,21 +286,26 @@ static void e1000_toggle_lanphypc_pch_lpt(struct e1000_hw *hw)
 }
 
 /**
- * e1000_reconfigure_k1_exit_timeout - reconfigure K1 exit timeout to
- * align to MTP and later platform requirements.
+ * e1000_reconfigure_k1_params - reconfigure Kumeran K1 parameters.
  * @hw: pointer to the HW structure
  *
+ * By default K1 is enabled after MAC reset, so this function only
+ * disables it.
+ *
  * Context: PHY semaphore must be held by caller.
  * Return: 0 on success, negative on failure
  */
-static s32 e1000_reconfigure_k1_exit_timeout(struct e1000_hw *hw)
+static s32 e1000_reconfigure_k1_params(struct e1000_hw *hw)
 {
 	u16 phy_timeout;
 	u32 fextnvm12;
 	s32 ret_val;
 
-	if (hw->mac.type < e1000_pch_mtp)
+	if (hw->mac.type < e1000_pch_mtp) {
+		if (hw->adapter->flags2 & FLAG2_DISABLE_K1)
+			return e1000_configure_k1_ich8lan(hw, false);
 		return 0;
+	}
 
 	/* Change Kumeran K1 power down state from P0s to P1 */
 	fextnvm12 = er32(FEXTNVM12);
@@ -310,6 +315,8 @@ static s32 e1000_reconfigure_k1_exit_timeout(struct e1000_hw *hw)
 
 	/* Wait for the interface the settle */
 	usleep_range(1000, 1100);
+	if (hw->adapter->flags2 & FLAG2_DISABLE_K1)
+		return e1000_configure_k1_ich8lan(hw, false);
 
 	/* Change K1 exit timeout */
 	ret_val = e1e_rphy_locked(hw, I217_PHY_TIMEOUTS_REG,
@@ -373,8 +380,8 @@ static s32 e1000_init_phy_workarounds_pchlan(struct e1000_hw *hw)
 		/* At this point the PHY might be inaccessible so don't
 		 * propagate the failure
 		 */
-		if (e1000_reconfigure_k1_exit_timeout(hw))
-			e_dbg("Failed to reconfigure K1 exit timeout\n");
+		if (e1000_reconfigure_k1_params(hw))
+			e_dbg("Failed to reconfigure K1 parameters\n");
 
 		fallthrough;
 	case e1000_pch_lpt:
@@ -473,10 +480,10 @@ static s32 e1000_init_phy_workarounds_pchlan(struct e1000_hw *hw)
 		if (hw->mac.type >= e1000_pch_mtp) {
 			ret_val = hw->phy.ops.acquire(hw);
 			if (ret_val) {
-				e_err("Failed to reconfigure K1 exit timeout\n");
+				e_err("Failed to reconfigure K1 parameters\n");
 				goto out;
 			}
-			ret_val = e1000_reconfigure_k1_exit_timeout(hw);
+			ret_val = e1000_reconfigure_k1_params(hw);
 			hw->phy.ops.release(hw);
 		}
 	}
@@ -4948,17 +4955,15 @@ static s32 e1000_init_hw_ich8lan(struct e1000_hw *hw)
 	u16 i;
 
 	e1000_initialize_hw_bits_ich8lan(hw);
-	if (hw->mac.type >= e1000_pch_mtp) {
-		ret_val = hw->phy.ops.acquire(hw);
-		if (ret_val)
-			return ret_val;
+	ret_val = hw->phy.ops.acquire(hw);
+	if (ret_val)
+		return ret_val;
 
-		ret_val = e1000_reconfigure_k1_exit_timeout(hw);
-		hw->phy.ops.release(hw);
-		if (ret_val) {
-			e_dbg("Error failed to reconfigure K1 exit timeout\n");
-			return ret_val;
-		}
+	ret_val = e1000_reconfigure_k1_params(hw);
+	hw->phy.ops.release(hw);
+	if (ret_val) {
+		e_dbg("Error failed to reconfigure K1 parameters\n");
+		return ret_val;
 	}
 
 	/* Initialize identification LED */
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 201322dac233..116f3c92b5bc 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -7675,6 +7675,9 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	/* init PTP hardware clock */
 	e1000e_ptp_init(adapter);
 
+	if (hw->mac.type >= e1000_pch_mtp)
+		adapter->flags2 |= FLAG2_DISABLE_K1;
+
 	/* reset the hardware with the new settings */
 	e1000e_reset(adapter);