projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b35be415 EH |
1 | LAN9303 Ethernet switch driver |
| 2 | ============================== | |
| 3 | ||
| 4b33709d EH |
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). | |
| b35be415 EH |
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 |