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Commit b35be415 authored by Egil Hjelmeland's avatar Egil Hjelmeland Committed by David S. Miller
Browse files

net: dsa: lan9303: Added Documentation/networking/dsa/lan9303.txt 



Provide a rough overview of the state of the driver. And explain that the
driver operates in two modes: bridged and port-separated.

Signed-off-by: default avatarEgil Hjelmeland <egil.hjelmeland@zenitel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6e1a2882

Documentation/networking/dsa/lan9303.txt

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LAN9303 Ethernet switch driver

==============================



The LAN9303 is a three port 10/100 ethernet switch with integrated phys for the

two external ethernet ports. The third port is an RMII/MII interface to a host

master network interface (e.g. fixed link).





Driver details

==============



The driver is implemented as a DSA driver, see

Documentation/networking/dsa/dsa.txt.



See Documentation/devicetree/bindings/net/dsa/lan9303.txt for device tree

binding.



The LAN9303 can be managed both via MDIO and I2C, both supported by this driver.



At startup the driver configures the device to provide two separate network

interfaces (which is the default state of a DSA device). Due to HW limitations,

no HW MAC learning takes place in this mode.



When both user ports are joined to the same bridge, the normal HW MAC learning

is enabled. This means that unicast traffic is forwarded in HW. Broadcast and

multicast is flooded in HW. STP is also supported in this mode. The driver

support fdb/mdb operations as well, meaning IGMP snooping is supported.



If one of the user ports leave the bridge, the ports goes back to the initial

separated operation.





Driver limitations

==================



 - Support for VLAN filtering is not implemented

 - The HW does not support VLAN-specific fdb entries