vxlan: Copy needed_tailroom from lowerdev
While vxlan doesn't need any extra tailroom, the lowerdev might need it. In that case, copy it over to reduce the chance for additional (re)allocations in the transmit path. Signed-off-by: Sven Eckelmann <sven@narfation.org> Link: https://lore.kernel.org/r/20201126125247.1047977-2-sven@narfation.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>
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