Since changing the MTU of dsa slave interfaces was implemented, the fec/mv88e6xxx combo has been giving warnings:
[ 2.275925] mv88e6085 0.2:00: nonfatal error -95 setting MTU on port 9 [ 2.284306] eth1: mtu greater than device maximum [ 2.287759] fec 400d1000.ethernet eth1: error -22 setting MTU to include DSA overhead This patchset adds support for changing the MTU on mv88e6xxx switches, which do support jumbo frames. And it modifies the FEC driver to support its true MTU range, which is larger than the default Ethernet MTU. Andrew Lunn (2): net: dsa: mv88e6xxx: Implement MTU change net: fec: Set max MTU size to allow the MTU to be changed drivers/net/dsa/mv88e6xxx/chip.c | 27 +++++++++++++++++++++++ drivers/net/ethernet/freescale/fec_main.c | 2 ++ 2 files changed, 29 insertions(+) -- 2.27.0.rc2
