1============================== 2LAN9303 Ethernet switch driver 3============================== 4 5The LAN9303 is a three port 10/100 Mbps ethernet switch with integrated phys for 6the two external ethernet ports. The third port is an RMII/MII interface to a 7host conduit network interface (e.g. fixed link). 8 9 10Driver details 11============== 12 13The driver is implemented as a DSA driver, see ``Documentation/networking/dsa/dsa.rst``. 14 15See ``Documentation/devicetree/bindings/net/dsa/lan9303.txt`` for device tree 16binding. 17 18The LAN9303 can be managed both via MDIO and I2C, both supported by this driver. 19 20At startup the driver configures the device to provide two separate network 21interfaces (which is the default state of a DSA device). Due to HW limitations, 22no HW MAC learning takes place in this mode. 23 24When both user ports are joined to the same bridge, the normal HW MAC learning 25is enabled. This means that unicast traffic is forwarded in HW. Broadcast and 26multicast is flooded in HW. STP is also supported in this mode. The driver 27support fdb/mdb operations as well, meaning IGMP snooping is supported. 28 29If one of the user ports leave the bridge, the ports goes back to the initial 30separated operation. 31 32 33Driver limitations 34================== 35 36 - Support for VLAN filtering is not implemented 37 - The HW does not support VLAN-specific fdb entries 38