[dpdk-stable] [PATCH] net/i40e: set speed to undefined for default case in link update

[Thierry Herbelot <thierry.herbelot@6wind.com>]

From: Laurent Hardy <laurent.hardy@6wind.com>

During PF/VF link update, a default speed value of 100M will be set
if get_link_info has failed or speed is unknown.

Consequently if PF is put in no-carrier state, VFs will switch to
"in carrier" state due to a link up + a link speed set to 100M
(default value if no speed detected).

To be consistent with linux drivers on which PF and VFs are in
same carrier state, sets default speed to undefined (instead of 100M)
and updates a link status of VF only if link is up and speed is
different from undefined.

Fixes: 4861cde46116 ('i40e: new poll mode driver')
Cc: stable@dpdk.org
Cc: beilei.xing@intel.com
Cc: qi.z.zhang@intel.com

Signed-off-by: Laurent Hardy <laurent.hardy@6wind.com>
---
 drivers/net/i40e/i40e_ethdev.c    | 4 ++--
 drivers/net/i40e/i40e_ethdev_vf.c | 8 +++++---
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 4e40b7ab5250..76abe8209a10 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -2743,7 +2743,7 @@ update_link_aq(struct i40e_hw *hw, struct rte_eth_link *link,
 		status = i40e_aq_get_link_info(hw, enable_lse,
 						&link_status, NULL);
 		if (unlikely(status != I40E_SUCCESS)) {
-			link->link_speed = ETH_SPEED_NUM_100M;
+			link->link_speed = ETH_SPEED_NUM_NONE;
 			link->link_duplex = ETH_LINK_FULL_DUPLEX;
 			PMD_DRV_LOG(ERR, "Failed to get link info");
 			return;
@@ -2777,7 +2777,7 @@ update_link_aq(struct i40e_hw *hw, struct rte_eth_link *link,
 		link->link_speed = ETH_SPEED_NUM_40G;
 		break;
 	default:
-		link->link_speed = ETH_SPEED_NUM_100M;
+		link->link_speed = ETH_SPEED_NUM_NONE;
 		break;
 	}
 }
diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index c77b30c54ba7..a63b83f81718 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -2143,13 +2143,15 @@ i40evf_dev_link_update(struct rte_eth_dev *dev,
 		new_link.link_speed = ETH_SPEED_NUM_40G;
 		break;
 	default:
-		new_link.link_speed = ETH_SPEED_NUM_100M;
+		new_link.link_speed = ETH_SPEED_NUM_NONE;
 		break;
 	}
 	/* full duplex only */
 	new_link.link_duplex = ETH_LINK_FULL_DUPLEX;
-	new_link.link_status = vf->link_up ? ETH_LINK_UP :
-					     ETH_LINK_DOWN;
+	new_link.link_status = vf->link_up &&
+				new_link.link_speed != ETH_SPEED_NUM_NONE
+				? ETH_LINK_UP
+				: ETH_LINK_DOWN;
 	new_link.link_autoneg =
 		!(dev->data->dev_conf.link_speeds & ETH_LINK_SPEED_FIXED);
 
-- 
2.20.1