net: calxedaxgmac: rework transmit ring handling
Only generate tx interrupts on every ring size / 4 descriptors. Move the netif_stop_queue call to the end of the xmit function rather than checking at the beginning. Signed-off-by: NRob Herring <rob.herring@calxeda.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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