2019-04-12 19:55:18 +08:00
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==============================
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2017-11-02 17:20:58 +08:00
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LAN9303 Ethernet switch driver
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==============================
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2017-11-08 18:55:14 +08:00
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The LAN9303 is a three port 10/100 Mbps ethernet switch with integrated phys for
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the two external ethernet ports. The third port is an RMII/MII interface to a
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2023-10-24 02:17:28 +08:00
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host conduit network interface (e.g. fixed link).
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2017-11-02 17:20:58 +08:00
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Driver details
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==============
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2019-04-12 19:55:18 +08:00
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The driver is implemented as a DSA driver, see ``Documentation/networking/dsa/dsa.rst``.
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2017-11-02 17:20:58 +08:00
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2019-04-12 19:55:18 +08:00
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See ``Documentation/devicetree/bindings/net/dsa/lan9303.txt`` for device tree
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2017-11-02 17:20:58 +08:00
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binding.
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The LAN9303 can be managed both via MDIO and I2C, both supported by this driver.
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At startup the driver configures the device to provide two separate network
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interfaces (which is the default state of a DSA device). Due to HW limitations,
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no HW MAC learning takes place in this mode.
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When both user ports are joined to the same bridge, the normal HW MAC learning
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is enabled. This means that unicast traffic is forwarded in HW. Broadcast and
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multicast is flooded in HW. STP is also supported in this mode. The driver
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support fdb/mdb operations as well, meaning IGMP snooping is supported.
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If one of the user ports leave the bridge, the ports goes back to the initial
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separated operation.
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Driver limitations
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==================
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- Support for VLAN filtering is not implemented
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- The HW does not support VLAN-specific fdb entries
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