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- ==============================
- LAN9303 Ethernet switch driver
- ==============================
- The LAN9303 is a three port 10/100 Mbps 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.rst``.
- 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
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