tg3: 5719: Prevent tx data corruption
This patch enables a bit that prevents read DMA overflows and adjusts the txmbuf margin from the hardware default. The combination of these modifications prevents a tx data corruption issue we were seeing on the 5719. Signed-off-by: NMatt Carlson <mcarlson@broadcom.com> Reviewed-by: NMichael Chan <mchan@broadcom.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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