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[ Upstream commit b92ce2f ] The MTU passed to the DSA driver is the payload size, typically 1500. However, the switch uses the frame size when applying restrictions. Adjust the MTU with the size of the Ethernet header and the frame checksum. The VLAN header also needs to be included when the frame size it per port, but not when it is global. Fixes: 1baf0fa ("net: dsa: mv88e6xxx: Use chip-wide max frame size for MTU") Reported by: 曹煜 <cao88yu@gmail.com> Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
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