REG_SW_MAC_CTRL_1
ksz_cfg(dev, REG_SW_MAC_CTRL_1, SW_JUMBO_PACKET, true);
ksz_cfg(dev, REG_SW_MAC_CTRL_1, SW_BACK_PRESSURE,
ret = lan937x_cfg(dev, REG_SW_MAC_CTRL_1, NO_EXC_COLLISION_DROP, true);