AF_XDP xdp_umem_reg.headroom XDP_ZEROCOPY

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Hi all,
I woulld like to understand if the behaviour i'm getting is correct.

When I configure the XDP_UMEM_REG in zerocopy mode with a headroom ==
0 on a i40e,
the driver (i guess) actually sets a headroom of 256.
if i set a headroom == 256 the driver sets a headroom of 512.

If this behaviour is correct, would be nice that the xdp_umem_reg
struct after the setsockopt call would contain the actual configured
headroom.

Thank you for your time



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