+/* return 0 means link status changed, -1 means not changed */
+static int
+atl_dev_link_update(struct rte_eth_dev *dev, int wait __rte_unused)
+{
+ struct aq_hw_s *hw = ATL_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+ struct atl_interrupt *intr =
+ ATL_DEV_PRIVATE_TO_INTR(dev->data->dev_private);
+ struct rte_eth_link link, old;
+ int err = 0;
+
+ link.link_status = ETH_LINK_DOWN;
+ link.link_speed = 0;
+ link.link_duplex = ETH_LINK_FULL_DUPLEX;
+ link.link_autoneg = hw->is_autoneg ? ETH_LINK_AUTONEG : ETH_LINK_FIXED;
+ memset(&old, 0, sizeof(old));
+
+ /* load old link status */
+ rte_eth_linkstatus_get(dev, &old);
+
+ /* read current link status */
+ err = hw->aq_fw_ops->update_link_status(hw);
+
+ if (err)
+ return 0;
+
+ if (hw->aq_link_status.mbps == 0) {
+ /* write default (down) link status */
+ rte_eth_linkstatus_set(dev, &link);
+ if (link.link_status == old.link_status)
+ return -1;
+ return 0;
+ }
+
+ intr->flags &= ~ATL_FLAG_NEED_LINK_CONFIG;
+
+ link.link_status = ETH_LINK_UP;
+ link.link_duplex = ETH_LINK_FULL_DUPLEX;
+ link.link_speed = hw->aq_link_status.mbps;
+
+ rte_eth_linkstatus_set(dev, &link);
+
+ if (link.link_status == old.link_status)
+ return -1;
+
+ return 0;
+}
+
+
+/**
+ * It clears the interrupt causes and enables the interrupt.
+ * It will be called once only during nic initialized.
+ *
+ * @param dev
+ * Pointer to struct rte_eth_dev.
+ * @param on
+ * Enable or Disable.
+ *
+ * @return
+ * - On success, zero.
+ * - On failure, a negative value.
+ */
+
+static int
+atl_dev_lsc_interrupt_setup(struct rte_eth_dev *dev, uint8_t on __rte_unused)
+{
+ atl_dev_link_status_print(dev);
+ return 0;
+}
+
+static int
+atl_dev_rxq_interrupt_setup(struct rte_eth_dev *dev __rte_unused)
+{
+ return 0;
+}
+
+
+static int
+atl_dev_interrupt_get_status(struct rte_eth_dev *dev)
+{
+ struct atl_interrupt *intr =
+ ATL_DEV_PRIVATE_TO_INTR(dev->data->dev_private);
+ struct aq_hw_s *hw = ATL_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+ u64 cause = 0;
+
+ hw_atl_b0_hw_irq_read(hw, &cause);
+
+ atl_disable_intr(hw);
+ intr->flags = cause & BIT(ATL_IRQ_CAUSE_LINK) ?
+ ATL_FLAG_NEED_LINK_UPDATE : 0;
+
+ return 0;
+}
+
+/**
+ * It gets and then prints the link status.
+ *
+ * @param dev
+ * Pointer to struct rte_eth_dev.
+ *
+ * @return
+ * - On success, zero.
+ * - On failure, a negative value.
+ */
+static void
+atl_dev_link_status_print(struct rte_eth_dev *dev)
+{
+ struct rte_eth_link link;
+
+ memset(&link, 0, sizeof(link));
+ rte_eth_linkstatus_get(dev, &link);
+ if (link.link_status) {
+ PMD_DRV_LOG(INFO, "Port %d: Link Up - speed %u Mbps - %s",
+ (int)(dev->data->port_id),
+ (unsigned int)link.link_speed,
+ link.link_duplex == ETH_LINK_FULL_DUPLEX ?
+ "full-duplex" : "half-duplex");
+ } else {
+ PMD_DRV_LOG(INFO, " Port %d: Link Down",
+ (int)(dev->data->port_id));
+ }
+
+
+#ifdef DEBUG
+{
+ struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
+
+ PMD_DRV_LOG(DEBUG, "PCI Address: " PCI_PRI_FMT,
+ pci_dev->addr.domain,
+ pci_dev->addr.bus,
+ pci_dev->addr.devid,
+ pci_dev->addr.function);
+}
+#endif
+
+ PMD_DRV_LOG(INFO, "Link speed:%d", link.link_speed);
+}
+
+/*
+ * It executes link_update after knowing an interrupt occurred.
+ *
+ * @param dev
+ * Pointer to struct rte_eth_dev.
+ *
+ * @return
+ * - On success, zero.
+ * - On failure, a negative value.
+ */
+static int
+atl_dev_interrupt_action(struct rte_eth_dev *dev,
+ struct rte_intr_handle *intr_handle)
+{
+ struct atl_interrupt *intr =
+ ATL_DEV_PRIVATE_TO_INTR(dev->data->dev_private);
+
+ if (intr->flags & ATL_FLAG_NEED_LINK_UPDATE) {
+ atl_dev_link_update(dev, 0);
+ intr->flags &= ~ATL_FLAG_NEED_LINK_UPDATE;
+ atl_dev_link_status_print(dev);
+ _rte_eth_dev_callback_process(dev,
+ RTE_ETH_EVENT_INTR_LSC, NULL);
+ }
+
+ atl_enable_intr(dev);
+ rte_intr_enable(intr_handle);
+
+ return 0;
+}
+
+/**
+ * Interrupt handler triggered by NIC for handling
+ * specific interrupt.
+ *
+ * @param handle
+ * Pointer to interrupt handle.
+ * @param param
+ * The address of parameter (struct rte_eth_dev *) regsitered before.
+ *
+ * @return
+ * void
+ */
+static void
+atl_dev_interrupt_handler(void *param)
+{
+ struct rte_eth_dev *dev = (struct rte_eth_dev *)param;
+
+ atl_dev_interrupt_get_status(dev);
+ atl_dev_interrupt_action(dev, dev->intr_handle);
+}
+