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authorEgil Hjelmeland <egil.hjelmeland@zenitel.com>2017-11-02 12:20:58 +0300
committerDavid S. Miller <davem@davemloft.net>2017-11-02 14:31:23 +0300
commitb35be415499ad257954813f8def9c84f49f1ff34 (patch)
treea8bb9c1a5c06ee16c4c4c7422d79a9613d8509e7 /Documentation/networking
parent6e1a2882c6dcb680fb8776062719f51d95a0ec0b (diff)
downloadlinux-b35be415499ad257954813f8def9c84f49f1ff34.tar.xz
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: Egil Hjelmeland <egil.hjelmeland@zenitel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
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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