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The 6220 and 6250 switches do not have a learn2all bit in global1, ATU control register; bit 3 is reserverd. On the switches that do have that bit, it is used to control whether learning frames are sent out the ports that have the message_port bit set. So rather than adding yet another chip method, use the existence of the ->port_setup_message_port method as a proxy for determining whether the learn2all bit exists (and should be set). Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk> Link: https://lore.kernel.org/r/20201210110645.27765-1-rasmus.villemoes@prevas.dk Signed-off-by: Jakub Kicinski <kuba@kernel.org>