e1000e: use alternate MAC address on ESB2 if available

Similar to 82571/2/3 parts that already do this, if ESB2/80003es2lan parts
have an alternate MAC address provided in the EEPROM use it instead of the
default MAC address.  This patch makes the the actual code that does this
generic so that it can be better used by both MAC families.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 73 insertions, 51 deletions

diff --git a/drivers/net/e1000e/lib.c b/drivers/net/e1000e/lib.c
index 2fa9b36..5475424 100644
--- a/drivers/net/e1000e/lib.c
+++ b/drivers/net/e1000e/lib.c
@@ -139,6 +139,68 @@ void e1000e_init_rx_addrs(struct e1000_hw *hw, u16 rar_count)
 }
 
 /**
+ *  e1000_check_alt_mac_addr_generic - Check for alternate MAC addr
+ *  @hw: pointer to the HW structure
+ *
+ *  Checks the nvm for an alternate MAC address.  An alternate MAC address
+ *  can be setup by pre-boot software and must be treated like a permanent
+ *  address and must override the actual permanent MAC address. If an
+ *  alternate MAC address is found it is programmed into RAR0, replacing
+ *  the permanent address that was installed into RAR0 by the Si on reset.
+ *  This function will return SUCCESS unless it encounters an error while
+ *  reading the EEPROM.
+ **/
+s32 e1000_check_alt_mac_addr_generic(struct e1000_hw *hw)
+{
+	u32 i;
+	s32 ret_val = 0;
+	u16 offset, nvm_alt_mac_addr_offset, nvm_data;
+	u8 alt_mac_addr[ETH_ALEN];
+
+	ret_val = e1000_read_nvm(hw, NVM_ALT_MAC_ADDR_PTR, 1,
+	                         &nvm_alt_mac_addr_offset);
+	if (ret_val) {
+		e_dbg("NVM Read Error\n");
+		goto out;
+	}
+
+	if (nvm_alt_mac_addr_offset == 0xFFFF) {
+		/* There is no Alternate MAC Address */
+		goto out;
+	}
+
+	if (hw->bus.func == E1000_FUNC_1)
+		nvm_alt_mac_addr_offset += E1000_ALT_MAC_ADDRESS_OFFSET_LAN1;
+	for (i = 0; i < ETH_ALEN; i += 2) {
+		offset = nvm_alt_mac_addr_offset + (i >> 1);
+		ret_val = e1000_read_nvm(hw, offset, 1, &nvm_data);
+		if (ret_val) {
+			e_dbg("NVM Read Error\n");
+			goto out;
+		}
+
+		alt_mac_addr[i] = (u8)(nvm_data & 0xFF);
+		alt_mac_addr[i + 1] = (u8)(nvm_data >> 8);
+	}
+
+	/* if multicast bit is set, the alternate address will not be used */
+	if (alt_mac_addr[0] & 0x01) {
+		e_dbg("Ignoring Alternate Mac Address with MC bit set\n");
+		goto out;
+	}
+
+	/*
+	 * We have a valid alternate MAC address, and we want to treat it the
+	 * same as the normal permanent MAC address stored by the HW into the
+	 * RAR. Do this by mapping this address into RAR0.
+	 */
+	e1000e_rar_set(hw, alt_mac_addr, 0);
+
+out:
+	return ret_val;
+}
+
+/**
  *  e1000e_rar_set - Set receive address register
  *  @hw: pointer to the HW structure
  *  @addr: pointer to the receive address
@@ -2072,67 +2134,27 @@ s32 e1000e_write_nvm_spi(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
 }
 
 /**
- *  e1000e_read_mac_addr - Read device MAC address
+ *  e1000_read_mac_addr_generic - Read device MAC address
  *  @hw: pointer to the HW structure
  *
  *  Reads the device MAC address from the EEPROM and stores the value.
  *  Since devices with two ports use the same EEPROM, we increment the
  *  last bit in the MAC address for the second port.
  **/
-s32 e1000e_read_mac_addr(struct e1000_hw *hw)
+s32 e1000_read_mac_addr_generic(struct e1000_hw *hw)
 {
-	s32 ret_val;
-	u16 offset, nvm_data, i;
-	u16 mac_addr_offset = 0;
-
-	if (hw->mac.type == e1000_82571) {
-		/* Check for an alternate MAC address.  An alternate MAC
-		 * address can be setup by pre-boot software and must be
-		 * treated like a permanent address and must override the
-		 * actual permanent MAC address.*/
-		ret_val = e1000_read_nvm(hw, NVM_ALT_MAC_ADDR_PTR, 1,
-					 &mac_addr_offset);
-		if (ret_val) {
-			e_dbg("NVM Read Error\n");
-			return ret_val;
-		}
-		if (mac_addr_offset == 0xFFFF)
-			mac_addr_offset = 0;
-
-		if (mac_addr_offset) {
-			if (hw->bus.func == E1000_FUNC_1)
-				mac_addr_offset += ETH_ALEN/sizeof(u16);
-
-			/* make sure we have a valid mac address here
-			* before using it */
-			ret_val = e1000_read_nvm(hw, mac_addr_offset, 1,
-						 &nvm_data);
-			if (ret_val) {
-				e_dbg("NVM Read Error\n");
-				return ret_val;
-			}
-			if (nvm_data & 0x0001)
-				mac_addr_offset = 0;
-		}
+	u32 rar_high;
+	u32 rar_low;
+	u16 i;
 
-		if (mac_addr_offset)
-		hw->dev_spec.e82571.alt_mac_addr_is_present = 1;
-	}
+	rar_high = er32(RAH(0));
+	rar_low = er32(RAL(0));
 
-	for (i = 0; i < ETH_ALEN; i += 2) {
-		offset = mac_addr_offset + (i >> 1);
-		ret_val = e1000_read_nvm(hw, offset, 1, &nvm_data);
-		if (ret_val) {
-			e_dbg("NVM Read Error\n");
-			return ret_val;
-		}
-		hw->mac.perm_addr[i] = (u8)(nvm_data & 0xFF);
-		hw->mac.perm_addr[i+1] = (u8)(nvm_data >> 8);
-	}
+	for (i = 0; i < E1000_RAL_MAC_ADDR_LEN; i++)
+		hw->mac.perm_addr[i] = (u8)(rar_low >> (i*8));
 
-	/* Flip last bit of mac address if we're on second port */
-	if (!mac_addr_offset && hw->bus.func == E1000_FUNC_1)
-		hw->mac.perm_addr[5] ^= 1;
+	for (i = 0; i < E1000_RAH_MAC_ADDR_LEN; i++)
+		hw->mac.perm_addr[i+4] = (u8)(rar_high >> (i*8));
 
 	for (i = 0; i < ETH_ALEN; i++)
 		hw->mac.addr[i] = hw->mac.perm_addr[i];