xdp: For Intel AF_XDP drivers add XDP frame_sz

Intel drivers implement native AF_XDP zerocopy in separate C-files,
that have its own invocation of bpf_prog_run_xdp(). The setup of
xdp_buff is also handled in separately from normal code path.

This patch update XDP frame_sz for AF_XDP zerocopy drivers i40e, ice
and ixgbe, as the code changes needed are very similar.  Introduce a
helper function xsk_umem_xdp_frame_sz() for calculating frame size.

Signed-off-by: Jesper Dangaard Brouer <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Acked-by: Björn Töpel <[email protected]>
Cc: [email protected]
Cc: Magnus Karlsson <[email protected]>
Link: https://lore.kernel.org/bpf/158945347511.97035.8536753731329475655.stgit@firesoul

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