[dpdk-stable] net/ixgbe:fix wrong link status

[Zhang Xiao]

The link status for 82599eb got from link status register was not correct,
check the enable/disable flag of tx laser when getting the link status,
set the link status down if tx laser disabled since the tx laser flag
could be set correctly when up/down the link status.

Fixes: dc66e5fd01b9 ("net/ixgbe: improve link state check on VF")
Cc: stable at dpdk.org

Signed-off-by: Zhang Xiao <xiao.zhang at intel.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 87d2ad0..fc06a1a 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -2864,6 +2864,7 @@ ixgbe_dev_set_link_up(struct rte_eth_dev *dev)
 	} else {
 		/* Turn on the laser */
 		ixgbe_enable_tx_laser(hw);
+		ixgbe_dev_link_update(dev, 0);
 	}
 
 	return 0;
@@ -2894,6 +2895,7 @@ ixgbe_dev_set_link_down(struct rte_eth_dev *dev)
 	} else {
 		/* Turn off the laser */
 		ixgbe_disable_tx_laser(hw);
+		ixgbe_dev_link_update(dev, 0);
 	}
 
 	return 0;
@@ -3967,6 +3969,7 @@ ixgbe_dev_link_update_share(struct rte_eth_dev *dev,
 	u32 speed = 0;
 	int wait = 1;
 	bool autoneg = false;
+	u32 esdp_reg;
 
 	memset(&link, 0, sizeof(link));
 	link.link_status = ETH_LINK_DOWN;
@@ -3999,6 +4002,10 @@ ixgbe_dev_link_update_share(struct rte_eth_dev *dev,
 		return rte_eth_linkstatus_set(dev, &link);
 	}
 
+	esdp_reg = IXGBE_READ_REG(hw, IXGBE_ESDP);
+	if ((esdp_reg & IXGBE_ESDP_SDP3))
+		link_up = 0;
+
 	if (link_up == 0) {
 		intr->flags |= IXGBE_FLAG_NEED_LINK_CONFIG;
 		return rte_eth_linkstatus_set(dev, &link);
-- 
2.7.4