net: thunderx: Support for XDP header adjustment
When in XDP mode reserve XDP_PACKET_HEADROOM bytes at the start of receive buffer for XDP program to modify headers and adjust packet start. Additional code changes done to handle such packets. Signed-off-by: NSunil Goutham <sgoutham@cavium.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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