RE: [PATCH v4 bpf-next 1/3] net: veth: account total xdp_frame len running ndo_xdp_xmit

Lorenzo Bianconi wrote:

Even if this is a theoretical issue since it is not possible to perform
XDP_REDIRECT on a non-linear xdp_frame, veth driver does not account
paged area in ndo_xdp_xmit function pointer.
Introduce xdp_get_frame_len utility routine to get the xdp_frame full
length and account total frame size running XDP_REDIRECT of a
non-linear xdp frame into a veth device.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
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Acked-by: John Fastabend <john.fastabend@gmail.com>