[v4] net/e1000: fix link status update

  There is no need to judge the original link state,
only update the data according to the current link state.
It can maintain better robustness.

In addition, this patch change the variable
from link_check to link_up.

Fixes: 80ba61115e77 ("net/e1000: use link status helper functions")
Cc: stable@dpdk.org

Signed-off-by: Lunyuan Cui <lunyuanx.cui@intel.com>
---
v4:
* modifier commit log

v3:
* Change the variable from link_check to link_up.

v2
* Delete incorrect judgment
---
 drivers/net/e1000/em_ethdev.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)
  

On 11/20, Lunyuan Cui wrote:
>There is no need to judge the original link state,
>only update the data according to the current link state.
>It can maintain better robustness.
>
>In addition, this patch change the variable
>from link_check to link_up.
>
>Fixes: 80ba61115e77 ("net/e1000: use link status helper functions")
>Cc: stable@dpdk.org
>
>Signed-off-by: Lunyuan Cui <lunyuanx.cui@intel.com>
>---
>v4:
>* modifier commit log
>
>v3:
>* Change the variable from link_check to link_up.
>
>v2
>* Delete incorrect judgment
>---
> drivers/net/e1000/em_ethdev.c | 16 ++++++++--------
> 1 file changed, 8 insertions(+), 8 deletions(-)
>
>diff --git a/drivers/net/e1000/em_ethdev.c b/drivers/net/e1000/em_ethdev.c
>index 9a88b50b2..080cbe2df 100644
>--- a/drivers/net/e1000/em_ethdev.c
>+++ b/drivers/net/e1000/em_ethdev.c
>@@ -1121,9 +1121,9 @@ eth_em_link_update(struct rte_eth_dev *dev, int wait_to_complete)
> 	struct e1000_hw *hw =
> 		E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> 	struct rte_eth_link link;
>-	int link_check, count;
>+	int link_up, count;
> 
>-	link_check = 0;
>+	link_up = 0;
> 	hw->mac.get_link_status = 1;
> 
> 	/* possible wait-to-complete in up to 9 seconds */
>@@ -1133,31 +1133,31 @@ eth_em_link_update(struct rte_eth_dev *dev, int wait_to_complete)
> 		case e1000_media_type_copper:
> 			/* Do the work to read phy */
> 			e1000_check_for_link(hw);
>-			link_check = !hw->mac.get_link_status;
>+			link_up = !hw->mac.get_link_status;
> 			break;
> 
> 		case e1000_media_type_fiber:
> 			e1000_check_for_link(hw);
>-			link_check = (E1000_READ_REG(hw, E1000_STATUS) &
>+			link_up = (E1000_READ_REG(hw, E1000_STATUS) &
> 					E1000_STATUS_LU);
> 			break;
> 
> 		case e1000_media_type_internal_serdes:
> 			e1000_check_for_link(hw);
>-			link_check = hw->mac.serdes_has_link;
>+			link_up = hw->mac.serdes_has_link;
> 			break;
> 
> 		default:
> 			break;
> 		}
>-		if (link_check || wait_to_complete == 0)
>+		if (link_up || wait_to_complete == 0)
> 			break;
> 		rte_delay_ms(EM_LINK_UPDATE_CHECK_INTERVAL);
> 	}
> 	memset(&link, 0, sizeof(link));
> 
> 	/* Now we check if a transition has happened */
>-	if (link_check && (link.link_status == ETH_LINK_DOWN)) {
>+	if (link_up) {
> 		uint16_t duplex, speed;
> 		hw->mac.ops.get_link_up_info(hw, &speed, &duplex);
> 		link.link_duplex = (duplex == FULL_DUPLEX) ?
>@@ -1167,7 +1167,7 @@ eth_em_link_update(struct rte_eth_dev *dev, int wait_to_complete)
> 		link.link_status = ETH_LINK_UP;
> 		link.link_autoneg = !(dev->data->dev_conf.link_speeds &
> 				ETH_LINK_SPEED_FIXED);
>-	} else if (!link_check && (link.link_status == ETH_LINK_UP)) {
>+	} else {
> 		link.link_speed = ETH_SPEED_NUM_NONE;
> 		link.link_duplex = ETH_LINK_HALF_DUPLEX;
> 		link.link_status = ETH_LINK_DOWN;
>-- 
>2.17.1
>

Acked-by: Xiaolong Ye <xiaolong.ye@intel.com>

Applied to dpdk-next-net-intel, Thanks.