Texas Instruments K3 AM65 CPSW NUSS switchdev based ethernet driver

Version:1.0

Port renaming

In order to rename via udev:

ip -d link show dev sw0p1 | grep switchid

SUBSYSTEM=="net", ACTION=="add", ATTR{phys_switch_id}==<switchid>, \
        ATTR{phys_port_name}!="", NAME="sw0$attr{phys_port_name}"

Multi mac mode

  • The driver is operating in multi-mac mode by default, thus working as N individual network interfaces.

Enabling “switch”

The Switch mode can be enabled by configuring devlink driver parameter “switch_mode” to 1/true:

devlink dev param set platform/c000000.ethernet \
name switch_mode value true cmode runtime

This can be done regardless of the state of Port’s netdev devices - UP/DOWN, but Port’s netdev devices have to be in UP before joining to the bridge to avoid overwriting of bridge configuration as CPSW switch driver completely reloads its configuration when first port changes its state to UP.

When the both interfaces joined the bridge - CPSW switch driver will enable marking packets with offload_fwd_mark flag.

All configuration is implemented via switchdev API.

Bridge setup

devlink dev param set platform/c000000.ethernet \
name switch_mode value true cmode runtime

ip link add name br0 type bridge
ip link set dev br0 type bridge ageing_time 1000
ip link set dev sw0p1 up
ip link set dev sw0p2 up
ip link set dev sw0p1 master br0
ip link set dev sw0p2 master br0

[*] bridge vlan add dev br0 vid 1 pvid untagged self

[*] if vlan_filtering=1. where default_pvid=1

Note. Steps [*] are mandatory.

On/off STP

ip link set dev BRDEV type bridge stp_state 1/0

VLAN configuration

bridge vlan add dev br0 vid 1 pvid untagged self <---- add cpu port to VLAN 1

Note. This step is mandatory for bridge/default_pvid.

Add extra VLANs

  1. untagged:

    bridge vlan add dev sw0p1 vid 100 pvid untagged master
    bridge vlan add dev sw0p2 vid 100 pvid untagged master
    bridge vlan add dev br0 vid 100 pvid untagged self <---- Add cpu port to VLAN100
    
  2. tagged:

    bridge vlan add dev sw0p1 vid 100 master
    bridge vlan add dev sw0p2 vid 100 master
    bridge vlan add dev br0 vid 100 pvid tagged self <---- Add cpu port to VLAN100
    

FDBs

FDBs are automatically added on the appropriate switch port upon detection

Manually adding FDBs:

bridge fdb add aa:bb:cc:dd:ee:ff dev sw0p1 master vlan 100
bridge fdb add aa:bb:cc:dd:ee:fe dev sw0p2 master <---- Add on all VLANs

MDBs

MDBs are automatically added on the appropriate switch port upon detection

Manually adding MDBs:

bridge mdb add dev br0 port sw0p1 grp 239.1.1.1 permanent vid 100
bridge mdb add dev br0 port sw0p1 grp 239.1.1.1 permanent <---- Add on all VLANs

Multicast flooding

CPU port mcast_flooding is always on

Turning flooding on/off on swithch ports: bridge link set dev sw0p1 mcast_flood on/off

Access and Trunk port

bridge vlan add dev sw0p1 vid 100 pvid untagged master
bridge vlan add dev sw0p2 vid 100 master


bridge vlan add dev br0 vid 100 self
ip link add link br0 name br0.100 type vlan id 100

Note. Setting PVID on Bridge device itself works only for default VLAN (default_pvid).