tun: reserve extra headroom only when XDP is set
We reserve headroom unconditionally which could cause unnecessary stress on socket memory accounting because of increased trusesize. Fix this by only reserve extra headroom when XDP is set. Cc: Jakub Kicinski <kubakici@wp.pl> Signed-off-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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