r8169: disable tx interrupt coalescing on RTL8168
In contrast to switching rx irq coalescing off what fixed an issue, switching tx irq coalescing off is merely a latency optimization, therefore net-next. As part of this change: - Remove INTT_0 .. INTT_3 constants, they aren't used. - Remove comment in rtl_hw_start_8169(), we now have a detailed description by the code in rtl_set_coalesce(). - Due to switching irq coalescing off per default we don't need the initialization in rtl_hw_start_8168(). If ethtool is used to switch on coalescing then rtl_set_coalesce() will configure this register. For the sake of completeness: This patch just changes the default. Users still have the option to configure irq coalescing via ethtool. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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