e1000e: dump eeprom to dmesg for ich8/9

From: Jesse Brandeburg <jesse.brandeburg@intel.com>

dumping the eeprom for now seems like a bit of a verbose
hack, but might be useful when we want to restore it.

if syslogd (or something like) isn't running it won't be kept
however.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
---

 drivers/net/e1000e/netdev.c |   51 +++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 51 insertions(+), 0 deletions(-)

diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 89ca272..48072fa 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -4338,6 +4338,52 @@ static void e1000_eeprom_checks(struct e1000_adapter *adapter)
 }
 
 /**
+ * e1000e_dump_eeprom - write the eeprom to kernel log
+ * @adapter: our adapter struct
+ *
+ * Dump the eeprom for users having checksum issues
+ **/
+static void e1000e_dump_eeprom(struct e1000_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+	struct ethtool_eeprom eeprom;
+	const struct ethtool_ops *ops = netdev->ethtool_ops;
+	u8 *data;
+	int i;
+	u16 csum_old, csum_new = 0;
+
+	eeprom.len = ops->get_eeprom_len(netdev);
+	eeprom.offset = 0;
+
+	data = kzalloc(eeprom.len, GFP_KERNEL);
+	if (!data) {
+		printk(KERN_ERR "Unable to allocate memory to dump EEPROM"
+		       " data\n");
+		return;
+	}
+
+	ops->get_eeprom(netdev, &eeprom, data);
+
+	csum_old = (data[NVM_CHECKSUM_REG * 2]) +
+		   (data[NVM_CHECKSUM_REG * 2 + 1] << 8);
+	for (i = 0; i < NVM_CHECKSUM_REG * 2; i += 2)
+		csum_new += data[i] + (data[i + 1] << 8);
+	csum_new = NVM_SUM - csum_new;
+
+	printk(KERN_ERR "/*********************/\n");
+	printk(KERN_ERR "Current EEPROM Checksum : 0x%04x\n", csum_old);
+	printk(KERN_ERR "Calculated              : 0x%04x\n", csum_new);
+
+	printk(KERN_ERR "Offset    Values\n");
+	printk(KERN_ERR "========  ======\n");
+	print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, data, 128, 0);
+
+	printk(KERN_ERR "/*********************/\n");
+
+	kfree(data);
+}
+
+/**
  * e1000_probe - Device Initialization Routine
  * @pdev: PCI device information struct
  * @ent: entry in e1000_pci_tbl
@@ -4541,6 +4587,11 @@ static int __devinit e1000_probe(struct pci_dev *pdev,
 
 	e1000_eeprom_checks(adapter);
 
+	/* debug code ... dump the first 128 bytes of the eeprom for
+	 * ich parts that might get a corruption */
+	if (adapter->flags & FLAG_IS_ICH)
+		e1000e_dump_eeprom(adapter);
+
 	/* copy the MAC address out of the NVM */
 	if (e1000e_read_mac_addr(&adapter->hw))
 		e_err("NVM Read Error while reading MAC address\n");