ixgbe: Patch to fix 82599 multispeed fiber link issues when driver is…

… loaded without any cable and reconnecting it to 1G partner

In 82599 multi speed fiber case when driver is loaded without any
cable and reconnecting the cable with a 1G partner does not bring
up the link in 1Gb mode. When there is no link we first setup the link
at 10G & 1G and then try to re-establish the link at highest speed 10G
and thereby changing autoneg_advertised value to highest speed 10G.
After connecting back the cable to a 1G link partner we never try 1G
as autoneg advertised value is changed to link at 10G only. The
following patch fixes the issue by properly initializing the
autoneg_advertised value just before exiting from link setup routine.

Signed-off-by: Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>
Acked-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ixgbe/ixgbe_82599.c

@@ -421,15 +421,6 @@ s32 ixgbe_setup_mac_link_multispeed_fiber(struct ixgbe_hw *hw,
 	hw->mac.ops.get_link_capabilities(hw, &phy_link_speed, &negotiation);
 	speed &= phy_link_speed;
 
-	 /* Set autoneg_advertised value based on input link speed */
-	hw->phy.autoneg_advertised = 0;
-
-	if (speed & IXGBE_LINK_SPEED_10GB_FULL)
-		hw->phy.autoneg_advertised |= IXGBE_LINK_SPEED_10GB_FULL;
-
-	if (speed & IXGBE_LINK_SPEED_1GB_FULL)
-		hw->phy.autoneg_advertised |= IXGBE_LINK_SPEED_1GB_FULL;
-
 	/*
 	 * When the driver changes the link speeds that it can support,
 	 * it sets autotry_restart to true to indicate that we need to
@@ -466,7 +457,7 @@ s32 ixgbe_setup_mac_link_multispeed_fiber(struct ixgbe_hw *hw,
 		                               autoneg,
 		                               autoneg_wait_to_complete);
 		if (status != 0)
-			goto out;
+			return status;
 
 		/* Flap the tx laser if it has not already been done */
 		if (hw->mac.autotry_restart) {
@@ -520,7 +511,7 @@ s32 ixgbe_setup_mac_link_multispeed_fiber(struct ixgbe_hw *hw,
 		                                      autoneg,
 		                                      autoneg_wait_to_complete);
 		if (status != 0)
-			goto out;
+			return status;
 
 		/* Flap the tx laser if it has not already been done */
 		if (hw->mac.autotry_restart) {
@@ -558,6 +549,15 @@ s32 ixgbe_setup_mac_link_multispeed_fiber(struct ixgbe_hw *hw,
 		                                               autoneg_wait_to_complete);
 
 out:
+	/* Set autoneg_advertised value based on input link speed */
+	hw->phy.autoneg_advertised = 0;
+
+	if (speed & IXGBE_LINK_SPEED_10GB_FULL)
+		hw->phy.autoneg_advertised |= IXGBE_LINK_SPEED_10GB_FULL;
+
+	if (speed & IXGBE_LINK_SPEED_1GB_FULL)
+		hw->phy.autoneg_advertised |= IXGBE_LINK_SPEED_1GB_FULL;
+
 	return status;
 }