[PATCH 2/2] e1000e: display a warning message when SmartSpeed works

[Koki Sanagi <sanagi.koki@jp.fujitsu.com>]

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 <sanagi.koki@jp.fujitsu.com>
---
 drivers/net/ethernet/intel/e1000e/netdev.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 337644d..1c416fc 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -4435,6 +4435,13 @@ 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
 			 */