tg3: Fix poor tx performance on 57766 after MTU change
GRC reset causes the read DMA engine to go into a mode that breaks up requests into 256 bytes. A PHY reset is required to bring it back to the normal mode. Signed-off-by: NMichael Chan <mchan@broadcom.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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