e1000e: iAMT connections drop on driver unload when jumbo frames enabled

The jumbo frame configuration in the MAC/PHY should be reverted on 82579
and newer parts when the interface is brought down (not just when the MTU
is changed back to standard frame size) otherwise iAMT connections (e.g.
SoL, IDE-R) will be dropped and cannot be re-acquired until the MTU is
changed again.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 10 insertions, 11 deletions

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 40e6232bed27..99596a63b6d0 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -2979,17 +2979,10 @@ static void e1000_setup_rctl(struct e1000_adapter *adapter)
         u32 pages = 0;
 
         /* Workaround Si errata on PCHx - configure jumbo frame flow */
-        if (hw->mac.type >= e1000_pch2lan) {
-                s32 ret_val;
-
-                if (adapter->netdev->mtu > ETH_DATA_LEN)
-                        ret_val = e1000_lv_jumbo_workaround_ich8lan(hw, true);
-                else
-                        ret_val = e1000_lv_jumbo_workaround_ich8lan(hw, false);
-
-                if (ret_val)
-                        e_dbg("failed to enable jumbo frame workaround mode\n");
-        }
+        if ((hw->mac.type >= e1000_pch2lan) &&
+            (adapter->netdev->mtu > ETH_DATA_LEN) &&
+            e1000_lv_jumbo_workaround_ich8lan(hw, true))
+                e_dbg("failed to enable jumbo frame workaround mode\n");
 
         /* Program MC offset vector base */
         rctl = er32(RCTL);
@@ -4034,6 +4027,12 @@ void e1000e_down(struct e1000_adapter *adapter)
         adapter->link_speed = 0;
         adapter->link_duplex = 0;
 
+        /* Disable Si errata workaround on PCHx for jumbo frame flow */
+        if ((hw->mac.type >= e1000_pch2lan) &&
+            (adapter->netdev->mtu > ETH_DATA_LEN) &&
+            e1000_lv_jumbo_workaround_ich8lan(hw, false))
+                e_dbg("failed to disable jumbo frame workaround mode\n");
+
         if (!pci_channel_offline(adapter->pdev))
                 e1000e_reset(adapter);