i40e: Add ndo_get_phys_port_id() callback support

This patch adds a new API to get the port mac address from firmware.
It also adds support to the ndo_get_phys_port_id() callback to provide
port specific unique id to the netdev layer.
If the adapter has a valid per-port mac address then that
would be used for this purpose and is expected to be unique
on a per-port basis.

The information can be viewed by reading the phys_port_id
attribute in sysfs for each netdev or via IF netlink
interface.

Change-ID: I341fa6fff9c112f1f6d987189309e730e0b50e8b
Signed-off-by: Neerav Parikh <neerav.parikh@intel.com>
Acked-by: Shannon Nelson <shannon.nelson@intel.com>
Tested-by: Jim Young <jamesx.m.young@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e.h

@@ -279,6 +279,7 @@ struct i40e_pf {
 #ifdef CONFIG_I40E_VXLAN
 #define I40E_FLAG_VXLAN_FILTER_SYNC            (u64)(1 << 27)
 #endif
+#define I40E_FLAG_PORT_ID_VALID                (u64)(1 << 28)
 #define I40E_FLAG_DCB_CAPABLE                  (u64)(1 << 29)
 
 	/* tracks features that get auto disabled by errors */

drivers/net/ethernet/intel/i40e/i40e_common.c

@@ -654,6 +654,31 @@ i40e_status i40e_get_mac_addr(struct i40e_hw *hw, u8 *mac_addr)
 	return status;
 }
 
+/**
+ * i40e_get_port_mac_addr - get Port MAC address
+ * @hw: pointer to the HW structure
+ * @mac_addr: pointer to Port MAC address
+ *
+ * Reads the adapter's Port MAC address
+ **/
+i40e_status i40e_get_port_mac_addr(struct i40e_hw *hw, u8 *mac_addr)
+{
+	struct i40e_aqc_mac_address_read_data addrs;
+	i40e_status status;
+	u16 flags = 0;
+
+	status = i40e_aq_mac_address_read(hw, &flags, &addrs, NULL);
+	if (status)
+		return status;
+
+	if (flags & I40E_AQC_PORT_ADDR_VALID)
+		memcpy(mac_addr, &addrs.port_mac, sizeof(addrs.port_mac));
+	else
+		status = I40E_ERR_INVALID_MAC_ADDR;
+
+	return status;
+}
+
 /**
  * i40e_pre_tx_queue_cfg - pre tx queue configure
  * @hw: pointer to the HW structure

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -7018,6 +7018,22 @@ static void i40e_del_vxlan_port(struct net_device *netdev,
 }
 
 #endif
+static int i40e_get_phys_port_id(struct net_device *netdev,
+				 struct netdev_phys_port_id *ppid)
+{
+	struct i40e_netdev_priv *np = netdev_priv(netdev);
+	struct i40e_pf *pf = np->vsi->back;
+	struct i40e_hw *hw = &pf->hw;
+
+	if (!(pf->flags & I40E_FLAG_PORT_ID_VALID))
+		return -EOPNOTSUPP;
+
+	ppid->id_len = min_t(int, sizeof(hw->mac.port_addr), sizeof(ppid->id));
+	memcpy(ppid->id, hw->mac.port_addr, ppid->id_len);
+
+	return 0;
+}
+
 #ifdef HAVE_FDB_OPS
 #ifdef USE_CONST_DEV_UC_CHAR
 static int i40e_ndo_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
@@ -7137,6 +7153,7 @@ static const struct net_device_ops i40e_netdev_ops = {
 	.ndo_add_vxlan_port	= i40e_add_vxlan_port,
 	.ndo_del_vxlan_port	= i40e_del_vxlan_port,
 #endif
+	.ndo_get_phys_port_id	= i40e_get_phys_port_id,
 #ifdef HAVE_FDB_OPS
 	.ndo_fdb_add		= i40e_ndo_fdb_add,
 #ifndef USE_DEFAULT_FDB_DEL_DUMP
@@ -8686,6 +8703,9 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	}
 	dev_info(&pdev->dev, "MAC address: %pM\n", hw->mac.addr);
 	ether_addr_copy(hw->mac.perm_addr, hw->mac.addr);
+	i40e_get_port_mac_addr(hw, hw->mac.port_addr);
+	if (is_valid_ether_addr(hw->mac.port_addr))
+		pf->flags |= I40E_FLAG_PORT_ID_VALID;
 
 	pci_set_drvdata(pdev, pf);
 	pci_save_state(pdev);

drivers/net/ethernet/intel/i40e/i40e_prototype.h

@@ -230,8 +230,8 @@ i40e_status i40e_pf_reset(struct i40e_hw *hw);
 void i40e_clear_hw(struct i40e_hw *hw);
 void i40e_clear_pxe_mode(struct i40e_hw *hw);
 bool i40e_get_link_status(struct i40e_hw *hw);
-i40e_status i40e_get_mac_addr(struct i40e_hw *hw,
-						u8 *mac_addr);
+i40e_status i40e_get_mac_addr(struct i40e_hw *hw, u8 *mac_addr);
+i40e_status i40e_get_port_mac_addr(struct i40e_hw *hw, u8 *mac_addr);
 i40e_status i40e_validate_mac_addr(u8 *mac_addr);
 void i40e_pre_tx_queue_cfg(struct i40e_hw *hw, u32 queue, bool enable);
 /* prototype for functions used for NVM access */

drivers/net/ethernet/intel/i40e/i40e_type.h

@@ -246,6 +246,7 @@ struct i40e_mac_info {
 	u8 addr[ETH_ALEN];
 	u8 perm_addr[ETH_ALEN];
 	u8 san_addr[ETH_ALEN];
+	u8 port_addr[ETH_ALEN];
 	u16 max_fcoeq;
 };