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net: thunderx: Add basic XDP support
Adds basic XDP support i.e attaching a BPF program to an interface. Also takes care of allocating separate Tx queues for XDP path and for network stack packet transmission. This patch doesn't support handling of any of the XDP actions, all are treated as XDP_PASS i.e packets will be handed over to the network stack. Changes also involve allocating one receive buffer per page in XDP mode and multiple in normal mode i.e when no BPF program is attached. Signed-off-by: Sunil Goutham <sgoutham@cavium.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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