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Test accuracy of GRO stats. We want to cover two potentially tricky cases: - single segment GRO - packets which were eligible but didn't get GRO'd The first case is trivial, teach gro.c to send one packet, and check GRO stats didn't move. Second case requires gro.c to send a lot of flows expecting the NIC to run out of GRO flow capacity. To avoid system traffic noise we steer the packets to a dedicated queue and operate on qstat. Link: https://patch.msgid.link/20260318033819.1469350-5-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>