Function eth_igb_stop

dpdk/drivers/net/e1000/igb_ethdev.c:1422–1486

* * This routine disables all traffic on the adapter by issuing a * global reset on the MAC. * **********************************************************************/

 *
 **********************************************************************/
static int
eth_igb_stop(struct rte_eth_dev *dev)
{
	struct e1000_hw *hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
	struct rte_eth_link link;
	struct rte_intr_handle *intr_handle = pci_dev->intr_handle;
	struct e1000_adapter *adapter =
		E1000_DEV_PRIVATE(dev->data->dev_private);

	/*
	 * This function calls into the base driver, which in turn will use
	 * function pointers, which are not guaranteed to be valid in secondary
	 * processes, so avoid using this function in secondary processes.
	 */
	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
		return -E_RTE_SECONDARY;

	if (adapter->stopped)
		return 0;

	eth_igb_rxtx_control(dev, false);

	igb_intr_disable(dev);

	/* disable intr eventfd mapping */
	rte_intr_disable(intr_handle);

	igb_pf_reset_hw(hw);
	E1000_WRITE_REG(hw, E1000_WUC, 0);

	/* Set bit for Go Link disconnect if PHY reset is not blocked */
	if (hw->mac.type >= e1000_82580 &&
	    (e1000_check_reset_block(hw) != E1000_BLK_PHY_RESET)) {
		uint32_t phpm_reg;

		phpm_reg = E1000_READ_REG(hw, E1000_82580_PHY_POWER_MGMT);
		phpm_reg |= E1000_82580_PM_GO_LINKD;
		E1000_WRITE_REG(hw, E1000_82580_PHY_POWER_MGMT, phpm_reg);
	}

	/* Power down the phy. Needed to make the link go Down */
	eth_igb_dev_set_link_down(dev);

	igb_dev_clear_queues(dev);

	/* clear the recorded link status */
	memset(&link, 0, sizeof(link));
	rte_eth_linkstatus_set(dev, &link);

	if (!rte_intr_allow_others(intr_handle))
		/* resume to the default handler */
		rte_intr_callback_register(intr_handle,
					   eth_igb_interrupt_handler,
					   (void *)dev);

	/* Clean datapath event and queue/vec mapping */
	rte_intr_efd_disable(intr_handle);