Re: [PATCH][2.6.32.y] igb: change how we handle alternate mac addresses

From 22896639af98ebc721a94ed71fc3acf2fb4a24dc Mon Sep 17 00:00:00 2001
From: Alexander Duyck <redacted>
Date: Mon, 5 Oct 2009 06:34:25 +0000
Subject: [PATCH] igb: change how we handle alternate mac addresses

This patch allows us to treat the alternate mac address as though it is the
physical address on the adapter.  This is accomplished by letting the
alt_mac_address function to only fail on an NVM error.  If no errors occur
and the alternate mac address is not present then RAR0 is read as the
default mac address.

Signed-off-by: Alexander Duyck <redacted>
Signed-off-by: Jeff Kirsher <redacted>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/igb/e1000_82575.c |   13 +++++++++++--
 drivers/net/igb/e1000_hw.h    |    2 ++
 drivers/net/igb/e1000_mac.c   |   17 +++++++++--------
 3 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/drivers/net/igb/e1000_82575.c b/drivers/net/igb/e1000_82575.c
index e07f66c..45063c2 100644
--- a/drivers/net/igb/e1000_82575.c
+++ b/drivers/net/igb/e1000_82575.c

@@ -1152,9 +1152,18 @@ static s32 igb_read_mac_addr_82575(struct e1000_hw *hw)
 {
 	s32 ret_val = 0;
 
-	if (igb_check_alt_mac_addr(hw))
-		ret_val = igb_read_mac_addr(hw);
+	/*
+	 * If there's an alternate MAC address place it in RAR0
+	 * so that it will override the Si installed default perm
+	 * address.
+	 */
+	ret_val = igb_check_alt_mac_addr(hw);
+	if (ret_val)
+		goto out;
+
+	ret_val = igb_read_mac_addr(hw);
 
+out:
 	return ret_val;
 }
 

diff --git a/drivers/net/igb/e1000_hw.h b/drivers/net/igb/e1000_hw.h
index 4e7850d..fad7cf5 100644
--- a/drivers/net/igb/e1000_hw.h
+++ b/drivers/net/igb/e1000_hw.h

@@ -54,6 +54,8 @@ struct e1000_hw;
 #define E1000_FUNC_0     0
 #define E1000_FUNC_1     1
 
+#define E1000_ALT_MAC_ADDRESS_OFFSET_LAN1   3
+
 enum e1000_mac_type {
 	e1000_undefined = 0,
 	e1000_82575,

diff --git a/drivers/net/igb/e1000_mac.c b/drivers/net/igb/e1000_mac.c
index 986aa90..4969a5b 100644
--- a/drivers/net/igb/e1000_mac.c
+++ b/drivers/net/igb/e1000_mac.c

@@ -185,13 +185,12 @@ s32 igb_check_alt_mac_addr(struct e1000_hw *hw)
 	}
 
 	if (nvm_alt_mac_addr_offset == 0xFFFF) {
-		ret_val = -(E1000_NOT_IMPLEMENTED);
+		/* There is no Alternate MAC Address */
 		goto out;
 	}
 
 	if (hw->bus.func == E1000_FUNC_1)
-		nvm_alt_mac_addr_offset += ETH_ALEN/sizeof(u16);
-
+		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 = hw->nvm.ops.read(hw, offset, 1, &nvm_data);

@@ -206,14 +205,16 @@ s32 igb_check_alt_mac_addr(struct e1000_hw *hw)
 
 	/* if multicast bit is set, the alternate address will not be used */
 	if (alt_mac_addr[0] & 0x01) {
-		ret_val = -(E1000_NOT_IMPLEMENTED);
+		hw_dbg("Ignoring Alternate Mac Address with MC bit set\n");
 		goto out;
 	}
 
-	for (i = 0; i < ETH_ALEN; i++)
-		hw->mac.addr[i] = hw->mac.perm_addr[i] = alt_mac_addr[i];
-
-	hw->mac.ops.rar_set(hw, hw->mac.perm_addr, 0);
+	/*
+	 * 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.
+	 */
+	hw->mac.ops.rar_set(hw, alt_mac_addr, 0);
 
 out:
 	return ret_val;

-- 
1.7.1