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Commit 9bbe3a57 authored by PJ Waskiewicz's avatar PJ Waskiewicz Committed by David S. Miller
Browse files

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: default avatarPeter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cfb3f91a

drivers/net/ixgbe/ixgbe_common.c

+14 −0
Original line number Diff line number Diff line
@@ -1783,6 +1783,20 @@ 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