e1000e: display a warning message when SmartSpeed works

Current e1000e driver doesn't tell nothing when Link Speed is downgraded due to
SmartSpeed.  As a result, users suspect that there is something wrong with
NIC.  If the cause of it is SmartSpeed, there is no means to replace NIC. This
patch make e1000e notify users that SmartSpeed worked.

Signed-off-by: Koki Sanagi <[email protected]>
Tested-by: Aaron Brown <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 3f7dbd1cdb0f333ffa5409cc269ccd8c305b5093..a177b8b65c44c615271b85840c18bd217f959212 100644 (file)
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -4830,6 +4830,13 @@ static void e1000_watchdog_task(struct work_struct *work)
                                                   &adapter->link_speed,
                                                   &adapter->link_duplex);
                        e1000_print_link_info(adapter);
+
+                       /* check if SmartSpeed worked */
+                       e1000e_check_downshift(hw);
+                       if (phy->speed_downgraded)
+                               netdev_warn(netdev,
+                                           "Link Speed was downgraded by SmartSpeed\n");
+
                        /* On supported PHYs, check for duplex mismatch only
                         * if link has autonegotiated at 10/100 half
                         */