[dpdk-stable] [PATCH v4] net/ixgbe: fix link status

[Lunyuan Cui]

The link status for 82599eb got from link status register was not
correct. Check the enable/disable flag of tx laser, set the link
status down if tx laser disabled. Then, we can get correct status.
But after port reset, tx laser register will be reset enable.
Link status will always be up. So set tx laser disable when port resets.

When hw->mac.autotry_restart is true, whether tx laser is disable or
enable, it will be set enable in ixgbe_flap_tx_laser_multispeed_fiber().
hw->mac.autotry_restart can be set true in both port init and port start.
Because we don't need this treatment before port starts, set
hw->mac.autotry_restart false when port init.

Fixes: 0408f47ba4d6 ("net/ixgbe: fix busy polling while fiber link update")
Cc: stable at dpdk.org

Signed-off-by: Lunyuan Cui <lunyuanx.cui at intel.com>
---
v4:
* modifier commit log
	Describe the problem in more detail.

v3:
* Correct countermeasure
	Don't delete ixgbe_dev_setup_link_alarm_handler().

v2:
* modifier commit log
	Add a log why I delete ixgbe_dev_setup_link_alarm_handler().
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 8c1caac18..260484fbf 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -1188,6 +1188,7 @@ eth_ixgbe_dev_init(struct rte_eth_dev *eth_dev, void *init_params __rte_unused)
 	diag = ixgbe_bypass_init_hw(hw);
 #else
 	diag = ixgbe_init_hw(hw);
+	hw->mac.autotry_restart = false;
 #endif /* RTE_LIBRTE_IXGBE_BYPASS */
 
 	/*
@@ -1298,6 +1299,8 @@ eth_ixgbe_dev_init(struct rte_eth_dev *eth_dev, void *init_params __rte_unused)
 	/* enable support intr */
 	ixgbe_enable_intr(eth_dev);
 
+	ixgbe_dev_set_link_down(eth_dev);
+
 	/* initialize filter info */
 	memset(filter_info, 0,
 	       sizeof(struct ixgbe_filter_info));
-- 
2.17.1