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This patch enables ethtool to correctly identify flow control (pause frame) auto negotiation, as well as disallow enabling it when it is not supported. The ixgbe_device_supports_autoneg_fc function is exported and used for this purpose. There is also one minor cleanup of the device_supports_autoneg_fc by removing an unnecessary return statement. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>