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