net: mscc: ocelot: create a helper for changing the port MTU
Since in an NPI/DSA setup, not all ports will have the same MTU, we need to make sure the watermarks for pause frames and/or tail dropping logic that existed in the driver is still coherent for the new MTU values. We need to do this because the NPI (aka external CPU) port needs an increased MTU for the DSA tag. This will be done in a future patch. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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