bnxt_en: Add bp->rx_dir field for rx buffer DMA direction.
When driver is running in XDP mode, rx buffers are DMA mapped as DMA_BIDIRECTIONAL. Add a field so the code will map/unmap rx buffers according to this field. Signed-off-by: NMichael Chan <michael.chan@broadcom.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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