| Egil Hjelmeland | b35be41 | 2017-11-02 10:20:58 +0100 | [diff] [blame] | 1 | LAN9303 Ethernet switch driver |
| 2 | ============================== |
| 3 | |
| Egil Hjelmeland | 4b33709 | 2017-11-08 11:55:14 +0100 | [diff] [blame] | 4 | The LAN9303 is a three port 10/100 Mbps ethernet switch with integrated phys for |
| 5 | the two external ethernet ports. The third port is an RMII/MII interface to a |
| 6 | host master network interface (e.g. fixed link). |
| Egil Hjelmeland | b35be41 | 2017-11-02 10:20:58 +0100 | [diff] [blame] | 7 | |
| 8 | |
| 9 | Driver details |
| 10 | ============== |
| 11 | |
| 12 | The driver is implemented as a DSA driver, see |
| 13 | Documentation/networking/dsa/dsa.txt. |
| 14 | |
| 15 | See Documentation/devicetree/bindings/net/dsa/lan9303.txt for device tree |
| 16 | binding. |
| 17 | |
| 18 | The LAN9303 can be managed both via MDIO and I2C, both supported by this driver. |
| 19 | |
| 20 | At startup the driver configures the device to provide two separate network |
| 21 | interfaces (which is the default state of a DSA device). Due to HW limitations, |
| 22 | no HW MAC learning takes place in this mode. |
| 23 | |
| 24 | When both user ports are joined to the same bridge, the normal HW MAC learning |
| 25 | is enabled. This means that unicast traffic is forwarded in HW. Broadcast and |
| 26 | multicast is flooded in HW. STP is also supported in this mode. The driver |
| 27 | support fdb/mdb operations as well, meaning IGMP snooping is supported. |
| 28 | |
| 29 | If one of the user ports leave the bridge, the ports goes back to the initial |
| 30 | separated operation. |
| 31 | |
| 32 | |
| 33 | Driver limitations |
| 34 | ================== |
| 35 | |
| 36 | - Support for VLAN filtering is not implemented |
| 37 | - The HW does not support VLAN-specific fdb entries |