ixgbe: Add support for 82599 alternative WWNN/WWPN prefix

The 82599 EEPROM supports alternative prefix for World Wide Node Name
(WWNN) and World Wide Port Name (WWPN). The prefixes can be used together
with the SAN MAC address to form the WWNN and WWPN, which can be used by
upper layer drivers such as Fiber Channel over Ethernet (FCoE).

Signed-off-by: Yi Zou <yi.zou@intel.com>
Acked-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 50 insertions, 0 deletions

diff --git a/drivers/net/ixgbe/ixgbe_82599.c b/drivers/net/ixgbe/ixgbe_82599.c
index ae27c41222e3..72106898a5cb 100644
--- a/drivers/net/ixgbe/ixgbe_82599.c
+++ b/drivers/net/ixgbe/ixgbe_82599.c
@@ -1000,6 +1000,10 @@ static s32 ixgbe_reset_hw_82599(struct ixgbe_hw *hw)
                 hw->mac.num_rar_entries--;
         }
 
+        /* Store the alternative WWNN/WWPN prefix */
+        hw->mac.ops.get_wwn_prefix(hw, &hw->mac.wwnn_prefix,
+                                       &hw->mac.wwpn_prefix);
+
 reset_hw_out:
         return status;
 }
@@ -2536,6 +2540,51 @@ fw_version_out:
         return status;
 }
 
+/**
+ *  ixgbe_get_wwn_prefix_82599 - Get alternative WWNN/WWPN prefix from
+ *  the EEPROM
+ *  @hw: pointer to hardware structure
+ *  @wwnn_prefix: the alternative WWNN prefix
+ *  @wwpn_prefix: the alternative WWPN prefix
+ *
+ *  This function will read the EEPROM from the alternative SAN MAC address
+ *  block to check the support for the alternative WWNN/WWPN prefix support.
+ **/
+static s32 ixgbe_get_wwn_prefix_82599(struct ixgbe_hw *hw, u16 *wwnn_prefix,
+                                      u16 *wwpn_prefix)
+{
+        u16 offset, caps;
+        u16 alt_san_mac_blk_offset;
+
+        /* clear output first */
+        *wwnn_prefix = 0xFFFF;
+        *wwpn_prefix = 0xFFFF;
+
+        /* check if alternative SAN MAC is supported */
+        hw->eeprom.ops.read(hw, IXGBE_ALT_SAN_MAC_ADDR_BLK_PTR,
+                            &alt_san_mac_blk_offset);
+
+        if ((alt_san_mac_blk_offset == 0) ||
+            (alt_san_mac_blk_offset == 0xFFFF))
+                goto wwn_prefix_out;
+
+        /* check capability in alternative san mac address block */
+        offset = alt_san_mac_blk_offset + IXGBE_ALT_SAN_MAC_ADDR_CAPS_OFFSET;
+        hw->eeprom.ops.read(hw, offset, &caps);
+        if (!(caps & IXGBE_ALT_SAN_MAC_ADDR_CAPS_ALTWWN))
+                goto wwn_prefix_out;
+
+        /* get the corresponding prefix for WWNN/WWPN */
+        offset = alt_san_mac_blk_offset + IXGBE_ALT_SAN_MAC_ADDR_WWNN_OFFSET;
+        hw->eeprom.ops.read(hw, offset, wwnn_prefix);
+
+        offset = alt_san_mac_blk_offset + IXGBE_ALT_SAN_MAC_ADDR_WWPN_OFFSET;
+        hw->eeprom.ops.read(hw, offset, wwpn_prefix);
+
+wwn_prefix_out:
+        return 0;
+}
+
 static struct ixgbe_mac_operations mac_ops_82599 = {
         .init_hw                = &ixgbe_init_hw_generic,
         .reset_hw               = &ixgbe_reset_hw_82599,
@@ -2547,6 +2596,7 @@ static struct ixgbe_mac_operations mac_ops_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,
+        .get_wwn_prefix         = &ixgbe_get_wwn_prefix_82599,
         .stop_adapter           = &ixgbe_stop_adapter_generic,
         .get_bus_info           = &ixgbe_get_bus_info_generic,
         .set_lan_id             = &ixgbe_set_lan_id_multi_port_pcie,