Function ngbe_dev_link_update_share

dpdk/drivers/net/ngbe/ngbe_ethdev.c:1900–1979

return 0 means link status changed, -1 means not changed */

/* return 0 means link status changed, -1 means not changed */
int
ngbe_dev_link_update_share(struct rte_eth_dev *dev,
			    int wait_to_complete)
{
	struct ngbe_hw *hw = ngbe_dev_hw(dev);
	struct rte_eth_link link;
	u32 link_speed = NGBE_LINK_SPEED_UNKNOWN;
	u32 lan_speed = 0;
	bool link_up;
	int err;
	int wait = 1;
	u32 reg;

	memset(&link, 0, sizeof(link));
	link.link_status = RTE_ETH_LINK_DOWN;
	link.link_speed = RTE_ETH_SPEED_NUM_NONE;
	link.link_duplex = RTE_ETH_LINK_HALF_DUPLEX;
	link.link_autoneg = !(dev->data->dev_conf.link_speeds &
			~RTE_ETH_LINK_SPEED_AUTONEG);

	hw->mac.get_link_status = true;

	/* check if it needs to wait to complete, if lsc interrupt is enabled */
	if (wait_to_complete == 0 || dev->data->dev_conf.intr_conf.lsc != 0)
		wait = 0;

	err = hw->mac.check_link(hw, &link_speed, &link_up, wait);
	if (err != 0) {
		link.link_speed = RTE_ETH_SPEED_NUM_NONE;
		link.link_duplex = RTE_ETH_LINK_FULL_DUPLEX;
		return rte_eth_linkstatus_set(dev, &link);
	}

	if (!link_up)
		return rte_eth_linkstatus_set(dev, &link);

	link.link_status = RTE_ETH_LINK_UP;
	link.link_duplex = RTE_ETH_LINK_FULL_DUPLEX;

	switch (link_speed) {
	default:
	case NGBE_LINK_SPEED_UNKNOWN:
		link.link_speed = RTE_ETH_SPEED_NUM_NONE;
		break;

	case NGBE_LINK_SPEED_10M_FULL:
		link.link_speed = RTE_ETH_SPEED_NUM_10M;
		lan_speed = 0;
		break;

	case NGBE_LINK_SPEED_100M_FULL:
		link.link_speed = RTE_ETH_SPEED_NUM_100M;
		lan_speed = 1;
		break;

	case NGBE_LINK_SPEED_1GB_FULL:
		link.link_speed = RTE_ETH_SPEED_NUM_1G;
		lan_speed = 2;