ixgbe: Add FCoE Storage MAC Address support

This patch implements the Storage Address entrypoint from the net device.
It will read the SAN MAC addresses from the EEPROM of the 82599 hardware,
and make them available to the FCoE stack through the net device.

Also, add/del the SAN MAC address to the netdev dev_addr_list via the
kernel api dev_addr_add()/dev_addr_del() when there is a valid SAN MAC
supported by the HW.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Yi Zou <yi.zou@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, 0 deletions

diff --git a/drivers/net/ixgbe/ixgbe_82599.c b/drivers/net/ixgbe/ixgbe_82599.c
index 23be4dbac7e..6bc964fdacb 100644
--- a/drivers/net/ixgbe/ixgbe_82599.c
+++ b/drivers/net/ixgbe/ixgbe_82599.c
@@ -819,6 +819,9 @@ s32 ixgbe_reset_hw_82599(struct ixgbe_hw *hw)
 	/* Store the permanent mac address */
 	hw->mac.ops.get_mac_addr(hw, hw->mac.perm_addr);
 
+	/* Store the permanent SAN mac address */
+	hw->mac.ops.get_san_mac_addr(hw, hw->mac.san_addr);
+
 reset_hw_out:
 	return status;
 }
@@ -1294,6 +1297,75 @@ s32 ixgbe_get_device_caps_82599(struct ixgbe_hw *hw, u16 *device_caps)
 	return 0;
 }
 
+/**
+ *  ixgbe_get_san_mac_addr_offset_82599 - SAN MAC address offset for 82599
+ *  @hw: pointer to hardware structure
+ *  @san_mac_offset: SAN MAC address offset
+ *
+ *  This function will read the EEPROM location for the SAN MAC address
+ *  pointer, and returns the value at that location.  This is used in both
+ *  get and set mac_addr routines.
+ **/
+s32 ixgbe_get_san_mac_addr_offset_82599(struct ixgbe_hw *hw,
+                                        u16 *san_mac_offset)
+{
+	/*
+	 * First read the EEPROM pointer to see if the MAC addresses are
+	 * available.
+	 */
+	hw->eeprom.ops.read(hw, IXGBE_SAN_MAC_ADDR_PTR, san_mac_offset);
+
+	return 0;
+}
+
+/**
+ *  ixgbe_get_san_mac_addr_82599 - SAN MAC address retrieval for 82599
+ *  @hw: pointer to hardware structure
+ *  @san_mac_addr: SAN MAC address
+ *
+ *  Reads the SAN MAC address from the EEPROM, if it's available.  This is
+ *  per-port, so set_lan_id() must be called before reading the addresses.
+ *  set_lan_id() is called by identify_sfp(), but this cannot be relied
+ *  upon for non-SFP connections, so we must call it here.
+ **/
+s32 ixgbe_get_san_mac_addr_82599(struct ixgbe_hw *hw, u8 *san_mac_addr)
+{
+	u16 san_mac_data, san_mac_offset;
+	u8 i;
+
+	/*
+	 * First read the EEPROM pointer to see if the MAC addresses are
+	 * available.  If they're not, no point in calling set_lan_id() here.
+	 */
+	ixgbe_get_san_mac_addr_offset_82599(hw, &san_mac_offset);
+
+	if ((san_mac_offset == 0) || (san_mac_offset == 0xFFFF)) {
+		/*
+		 * No addresses available in this EEPROM.  It's not an
+		 * error though, so just wipe the local address and return.
+		 */
+		for (i = 0; i < 6; i++)
+			san_mac_addr[i] = 0xFF;
+
+		goto san_mac_addr_out;
+	}
+
+	/* make sure we know which port we need to program */
+	hw->mac.ops.set_lan_id(hw);
+	/* apply the port offset to the address offset */
+	(hw->bus.func) ? (san_mac_offset += IXGBE_SAN_MAC_ADDR_PORT1_OFFSET) :
+	                 (san_mac_offset += IXGBE_SAN_MAC_ADDR_PORT0_OFFSET);
+	for (i = 0; i < 3; i++) {
+		hw->eeprom.ops.read(hw, san_mac_offset, &san_mac_data);
+		san_mac_addr[i * 2] = (u8)(san_mac_data);
+		san_mac_addr[i * 2 + 1] = (u8)(san_mac_data >> 8);
+		san_mac_offset++;
+	}
+
+san_mac_addr_out:
+	return 0;
+}
+
 static struct ixgbe_mac_operations mac_ops_82599 = {
 	.init_hw                = &ixgbe_init_hw_generic,
 	.reset_hw               = &ixgbe_reset_hw_82599,
@@ -1303,6 +1375,7 @@ static struct ixgbe_mac_operations mac_ops_82599 = {
 	.get_supported_physical_layer = &ixgbe_get_supported_physical_layer_82599,
 	.enable_rx_dma          = &ixgbe_enable_rx_dma_82599,
 	.get_mac_addr           = &ixgbe_get_mac_addr_generic,
+	.get_san_mac_addr       = &ixgbe_get_san_mac_addr_82599,
 	.get_device_caps        = &ixgbe_get_device_caps_82599,
 	.stop_adapter           = &ixgbe_stop_adapter_generic,
 	.get_bus_info           = &ixgbe_get_bus_info_generic,