[dpdk-stable] [PATCH v3] net/i40e: fix link status update

[Fan Zhang]

This patch fixes link status update problem in interrupt mode.
Previously, directly reading link status register instead of
accessing via admin queue command may cause the link status
change interrupt callback inactive. This patch fixes the
problem by making the driver only read the register in
"no wait" and polling mode.

Bugzilla ID: 54
Fixes: eef2daf2e199 ("net/i40e: fix link update no wait")
Cc: stable at dpdk.org

Signed-off-by: Fan Zhang <roy.fan.zhang at intel.com>
---
 drivers/net/i40e/i40e_ethdev.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 7d4f1c9da..13c5d3296 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -2522,7 +2522,7 @@ i40e_dev_set_link_down(struct rte_eth_dev *dev)
 }
 
 static __rte_always_inline void
-update_link_no_wait(struct i40e_hw *hw, struct rte_eth_link *link)
+update_link_reg(struct i40e_hw *hw, struct rte_eth_link *link)
 {
 /* Link status registers and values*/
 #define I40E_PRTMAC_LINKSTA		0x001E2420
@@ -2576,8 +2576,8 @@ update_link_no_wait(struct i40e_hw *hw, struct rte_eth_link *link)
 }
 
 static __rte_always_inline void
-update_link_wait(struct i40e_hw *hw, struct rte_eth_link *link,
-	bool enable_lse)
+update_link_aq(struct i40e_hw *hw, struct rte_eth_link *link,
+	bool enable_lse, int wait_to_complete)
 {
 #define CHECK_INTERVAL             100  /* 100ms */
 #define MAX_REPEAT_TIME            10  /* 1s (10 * 100ms) in total */
@@ -2601,7 +2601,7 @@ update_link_wait(struct i40e_hw *hw, struct rte_eth_link *link,
 		}
 
 		link->link_status = link_status.link_info & I40E_AQ_LINK_UP;
-		if (unlikely(link->link_status != 0))
+		if (!wait_to_complete || link->link_status)
 			break;
 
 		rte_delay_ms(CHECK_INTERVAL);
@@ -2649,10 +2649,10 @@ i40e_dev_link_update(struct rte_eth_dev *dev,
 	link.link_autoneg = !(dev->data->dev_conf.link_speeds &
 			ETH_LINK_SPEED_FIXED);
 
-	if (!wait_to_complete)
-		update_link_no_wait(hw, &link);
+	if (!wait_to_complete && !enable_lse)
+		update_link_reg(hw, &link);
 	else
-		update_link_wait(hw, &link, enable_lse);
+		update_link_aq(hw, &link, enable_lse, wait_to_complete);
 
 	ret = rte_eth_linkstatus_set(dev, &link);
 	i40e_notify_all_vfs_link_status(dev);
-- 
2.13.6