igb: Force flow control off during reset when forcing speed.

During igb_reset(), we initiate a hardware reset which will clear our
flow control settings. For auto-negotiation, we re-negotiate them when
linking up again, but we need to force them off properly for the forced
speed case.

Signed-off-by: Matthew Vick <matthew.vick@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 28a37bb00c90..f40f3886eb26 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -1715,6 +1715,13 @@ void igb_reset(struct igb_adapter *adapter)
         if (hw->mac.ops.init_hw(hw))
                 dev_err(&pdev->dev, "Hardware Error\n");
 
+        /*
+         * Flow control settings reset on hardware reset, so guarantee flow
+         * control is off when forcing speed.
+         */
+        if (!hw->mac.autoneg)
+                igb_force_mac_fc(hw);
+
         igb_init_dmac(adapter, pba);
         if (!netif_running(adapter->netdev))
                 igb_power_down_link(adapter);