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Add a test for ensuring that the dst hint mechanism is used for directed broadcast addresses. This test relies on mausezahn for sending directed broadcast packets. Additionally, a high GRO flush timeout is set to ensure that packets will be received as lists. The test determines if the hint mechanism was used by checking the in_brd statistic using lnstat. Signed-off-by: Oscar Maes <oscmaes92@gmail.com> Link: https://patch.msgid.link/20250819174642.5148-3-oscmaes92@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>