ixgbe: Allow link flow control in DCB mode for 82599 adapters

82599 supports using either link flow control or priority flow control when
in DCB mode.  The dcbnl interface already supports sending down
configurations through rtnetlink that can enable LFC when DCB is enabled,
so the driver should take advantage of this.

82598 does not support using LFC when DCB is enabled, so explicitly disable
it when we're in DCB mode.  This means we always run in PFC mode when DCB
is enabled.

Signed-off-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>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/net/ixgbe/ixgbe_ethtool.c b/drivers/net/ixgbe/ixgbe_ethtool.c
index 39fb98faffd0..6c7324339ec8 100644
--- a/drivers/net/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ixgbe/ixgbe_ethtool.c
@@ -270,6 +270,13 @@ static int ixgbe_set_pauseparam(struct net_device *netdev,
         struct ixgbe_adapter *adapter = netdev_priv(netdev);
         struct ixgbe_hw *hw = &adapter->hw;
 
+#ifdef CONFIG_DCB
+        if (adapter->dcb_cfg.pfc_mode_enable ||
+                ((hw->mac.type == ixgbe_mac_82598EB) &&
+                (adapter->flags & IXGBE_FLAG_DCB_ENABLED)))
+                return -EINVAL;
+
+#endif
         if (pause->autoneg != AUTONEG_ENABLE)
                 hw->fc.disable_fc_autoneg = true;
         else
@@ -286,6 +293,9 @@ static int ixgbe_set_pauseparam(struct net_device *netdev,
         else
                 return -EINVAL;
 
+#ifdef CONFIG_DCB
+        adapter->last_lfc_mode = hw->fc.requested_mode;
+#endif
         hw->mac.ops.setup_fc(hw, 0);
 
         return 0;