ixgbe: Disable Flow Control for certain devices

Flow Control autoneg should be disabled for certain adapters
that don't support autonegotiation of Flow Control at 10 gigabit.
These interfaces are the 10GBASE-T devices, CX4, and SFP+, all
running at 10 gigabit only.  1 gigabit is fine.

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, 14 insertions, 0 deletions

diff --git a/drivers/net/ixgbe/ixgbe_common.c b/drivers/net/ixgbe/ixgbe_common.c
index 40ff120a9ad4..f42a954ef660 100644
--- a/drivers/net/ixgbe/ixgbe_common.c
+++ b/drivers/net/ixgbe/ixgbe_common.c
@@ -1784,6 +1784,20 @@ s32 ixgbe_fc_autoneg(struct ixgbe_hw *hw)
         }
 
         /*
+         * Bail out on
+         * - copper or CX4 adapters
+         * - fiber adapters running at 10gig
+         */
+        if ((hw->phy.media_type == ixgbe_media_type_copper) ||
+             (hw->phy.media_type == ixgbe_media_type_cx4) ||
+             ((hw->phy.media_type == ixgbe_media_type_fiber) &&
+             (speed == IXGBE_LINK_SPEED_10GB_FULL))) {
+                hw->fc.fc_was_autonegged = false;
+                hw->fc.current_mode = hw->fc.requested_mode;
+                goto out;
+        }
+
+        /*
          * Read the AN advertisement and LP ability registers and resolve
          * local flow control settings accordingly
          */