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Date: Thu, 2 Nov 2017 10:20:58 +0100 From: Egil Hjelmeland <privat@...l-hjelmeland.no> To: andrew@...n.ch, vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Cc: Egil Hjelmeland <egil.hjelmeland@...itel.com> Subject: [PATCH net-next] net: dsa: lan9303: Added Documentation/networking/dsa/lan9303.txt From: Egil Hjelmeland <egil.hjelmeland@...itel.com> 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@...itel.com> --- Documentation/networking/dsa/lan9303.txt | 37 ++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 Documentation/networking/dsa/lan9303.txt diff --git a/Documentation/networking/dsa/lan9303.txt b/Documentation/networking/dsa/lan9303.txt new file mode 100644 index 000000000000..ec28683d107d --- /dev/null +++ b/Documentation/networking/dsa/lan9303.txt @@ -0,0 +1,37 @@ +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 -- 2.11.0
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