Add a simple test for USO. Tests both ipv4 and ipv6 with several full
segments and a partial segment.
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Joe Damato <joe@dama.to>
Link: https://patch.msgid.link/20260408230607.2019402-11-joe@dama.to
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
