i40e: fix bug in return from get_link_status and avoid spurious link messages

Previously, the driver could call this function and have only true/false
returned, but false could mean multiple things like failure to read
or link was down. This change allows the caller to get all return values
in the call chain bubbled back to the source, which keeps information about
failures from being lost.

Also, in some unlikely scenarios, the firmware can become slow to respond
to admin queue (AQ) queries for link state.  Should the AQ time out,
the driver can detect the state and avoid a link change when there
may have been none.

Change-ID: Ib2ac38407b7880750fb891b392fa77457fe6c21c
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 1fa1ebab9e92..f205e18a8530 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -5836,15 +5836,23 @@ static void i40e_veb_link_event(struct i40e_veb *veb, bool link_up)
  **/
 static void i40e_link_event(struct i40e_pf *pf)
 {
-	bool new_link, old_link;
 	struct i40e_vsi *vsi = pf->vsi[pf->lan_vsi];
 	u8 new_link_speed, old_link_speed;
+	i40e_status status;
+	bool new_link, old_link;
 
 	/* set this to force the get_link_status call to refresh state */
 	pf->hw.phy.get_link_info = true;
 
 	old_link = (pf->hw.phy.link_info_old.link_info & I40E_AQ_LINK_UP);
-	new_link = i40e_get_link_status(&pf->hw);
+
+	status = i40e_get_link_status(&pf->hw, &new_link);
+	if (status) {
+		dev_dbg(&pf->pdev->dev, "couldn't get link state, status: %d\n",
+			status);
+		return;
+	}
+
 	old_link_speed = pf->hw.phy.link_info_old.link_speed;
 	new_link_speed = pf->hw.phy.link_info.link_speed;