From: Dave Ertman <david.m.ertman@intel.com>
Date: Mon, 13 Jul 2020 13:53:06 -0700
Subject: ice: fix link event handling timing
Patch-mainline: v5.9-rc1
Git-commit: 0ce6c34a8f6f5b63c9ed5f2ee9be52ece1428350
References: jsc#SLE-12878

When the driver experiences a link event (especially link up)
there can be multiple events generated. Some of these are
link fault and still have a state of DOWN set.  The problem
happens when the link comes UP during the PF driver handling
one of the LINK DOWN events.  The status of the link is updated
and is now seen as UP, so when the actual LINK UP event comes,
the port information has already been updated to be seen as UP,
even though none of the UP activities have been completed.

After the link information has been updated in the link
handler and evaluated for MEDIA PRESENT, if the state
of the link has been changed to UP, treat the DOWN event
as an UP event since the link is now UP.

Signed-off-by: Dave Ertman <david.m.ertman@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/ice/ice_dcb_lib.c |    2 +-
 drivers/net/ethernet/intel/ice/ice_main.c    |    6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/intel/ice/ice_dcb_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_dcb_lib.c
@@ -463,7 +463,7 @@ void ice_dcb_rebuild(struct ice_pf *pf)
 		}
 	}
 
-	dev_info(dev, "DCB restored after reset\n");
+	dev_info(dev, "DCB info restored\n");
 	ret = ice_query_port_ets(pf->hw.port_info, &buf, sizeof(buf), NULL);
 	if (ret) {
 		dev_err(dev, "Query Port ETS failed\n");
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -902,6 +902,12 @@ ice_link_event(struct ice_pf *pf, struct
 		dev_dbg(dev, "Failed to update link status and re-enable link events for port %d\n",
 			pi->lport);
 
+	/* Check if the link state is up after updating link info, and treat
+	 * this event as an UP event since the link is actually UP now.
+	 */
+	if (phy_info->link_info.link_info & ICE_AQ_LINK_UP)
+		link_up = true;
+
 	vsi = ice_get_main_vsi(pf);
 	if (!vsi || !vsi->port_info)
 		return -EINVAL;