i40e: Fix multiple link up messages

This patch addresses an issue where multiple link up messages can be logged
resulting from aq link status timing when link properties are changed (fc,
speed, etc.); solved by using a single function to handle status printing
and adding a mechanism to track whether link state (up or down) has
actually changed.

Change-ID: Ied6ed6e49dc397c77d992adc0bc9ed3767152b9d
Signed-off-by: Matt Jared <matthew.a.jared@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e.h

@@ -537,6 +537,7 @@ struct i40e_vsi {
 	u16 idx;               /* index in pf->vsi[] */
 	u16 veb_idx;           /* index of VEB parent */
 	struct kobject *kobj;  /* sysfs object */
+	bool current_isup;     /* Sync 'link up' logging */
 
 	/* VSI specific handlers */
 	irqreturn_t (*irq_handler)(int irq, void *data);
@@ -791,4 +792,5 @@ int i40e_is_vsi_uplink_mode_veb(struct i40e_vsi *vsi);
 i40e_status i40e_get_npar_bw_setting(struct i40e_pf *pf);
 i40e_status i40e_set_npar_bw_setting(struct i40e_pf *pf);
 i40e_status i40e_commit_npar_bw_setting(struct i40e_pf *pf);
+void i40e_print_link_message(struct i40e_vsi *vsi, bool isup);
 #endif /* _I40E_H_ */

drivers/net/ethernet/intel/i40e/i40e_ethtool.c

@@ -690,7 +690,7 @@ static int i40e_set_settings(struct net_device *netdev,
 			/* Tell the OS link is going down, the link will go
 			 * back up when fw says it is ready asynchronously
 			 */
-			netdev_info(netdev, "PHY settings change requested, NIC Link is going down.\n");
+			i40e_print_link_message(vsi, false);
 			netif_carrier_off(netdev);
 			netif_tx_stop_all_queues(netdev);
 		}
@@ -834,7 +834,7 @@ static int i40e_set_pauseparam(struct net_device *netdev,
 	/* Tell the OS link is going down, the link will go back up when fw
 	 * says it is ready asynchronously
 	 */
-	netdev_info(netdev, "Flow control settings change requested, NIC Link is going down.\n");
+	i40e_print_link_message(vsi, false);
 	netif_carrier_off(netdev);
 	netif_tx_stop_all_queues(netdev);
 

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -4837,11 +4837,14 @@ static int i40e_init_pf_dcb(struct i40e_pf *pf)
  * i40e_print_link_message - print link up or down
  * @vsi: the VSI for which link needs a message
  */
-static void i40e_print_link_message(struct i40e_vsi *vsi, bool isup)
+void i40e_print_link_message(struct i40e_vsi *vsi, bool isup)
 {
 	char speed[SPEED_SIZE] = "Unknown";
 	char fc[FC_SIZE] = "RX/TX";
 
+	if (vsi->current_isup == isup)
+		return;
+	vsi->current_isup = isup;
 	if (!isup) {
 		netdev_info(vsi->netdev, "NIC Link is Down\n");
 		return;