Documentation: networking: add cpsw switchdev based driver documentation
A new cpsw dirver based on switchdev was added. Add documentation about basic configuration and future features Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Ilias Apalodimas
David S. Miller
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* Texas Instruments CPSW switchdev based ethernet driver 2.0
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- Port renaming
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On older udev versions renaming of ethX to swXpY will not be automatically
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supported
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In order to rename via udev:
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ip -d link show dev sw0p1 | grep switchid
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SUBSYSTEM=="net", ACTION=="add", ATTR{phys_switch_id}==<switchid>, \
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ATTR{phys_port_name}!="", NAME="sw0$attr{phys_port_name}"
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====================
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# Dual mac mode
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====================
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- The new (cpsw_new.c) driver is operating in dual-emac mode by default, thus
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working as 2 individual network interfaces. Main differences from legacy CPSW
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driver are:
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- optimized promiscuous mode: The P0_UNI_FLOOD (both ports) is enabled in
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addition to ALLMULTI (current port) instead of ALE_BYPASS.
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So, Ports in promiscuous mode will keep possibility of mcast and vlan filtering,
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which is provides significant benefits when ports are joined to the same bridge,
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but without enabling "switch" mode, or to different bridges.
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- learning disabled on ports as it make not too much sense for
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segregated ports - no forwarding in HW.
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- enabled basic support for devlink.
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devlink dev show
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platform/48484000.switch
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devlink dev param show
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platform/48484000.switch:
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name switch_mode type driver-specific
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values:
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cmode runtime value false
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name ale_bypass type driver-specific
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values:
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cmode runtime value false
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Devlink configuration parameters
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====================
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See Documentation/networking/devlink-params-ti-cpsw-switch.txt
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====================
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# Bridging in dual mac mode
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====================
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The dual_mac mode requires two vids to be reserved for internal purposes,
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which, by default, equal CPSW Port numbers. As result, bridge has to be
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configured in vlan unaware mode or default_pvid has to be adjusted.
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ip link add name br0 type bridge
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ip link set dev br0 type bridge vlan_filtering 0
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echo 0 > /sys/class/net/br0/bridge/default_pvid
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ip link set dev sw0p1 master br0
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ip link set dev sw0p2 master br0
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- or -
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ip link add name br0 type bridge
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ip link set dev br0 type bridge vlan_filtering 0
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echo 100 > /sys/class/net/br0/bridge/default_pvid
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ip link set dev br0 type bridge vlan_filtering 1
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ip link set dev sw0p1 master br0
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ip link set dev sw0p2 master br0
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====================
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# Enabling "switch"
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====================
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The Switch mode can be enabled by configuring devlink driver parameter
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"switch_mode" to 1/true:
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devlink dev param set platform/48484000.switch \
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name switch_mode value 1 cmode runtime
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This can be done regardless of the state of Port's netdev devices - UP/DOWN, but
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Port's netdev devices have to be in UP before joining to the bridge to avoid
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overwriting of bridge configuration as CPSW switch driver copletly reloads its
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configuration when first Port changes its state to UP.
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When the both interfaces joined the bridge - CPSW switch driver will enable
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marking packets with offload_fwd_mark flag unless "ale_bypass=0"
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All configuration is implemented via switchdev API.
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====================
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# Bridge setup
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====================
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devlink dev param set platform/48484000.switch \
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name switch_mode value 1 cmode runtime
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ip link add name br0 type bridge
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ip link set dev br0 type bridge ageing_time 1000
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ip link set dev sw0p1 up
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ip link set dev sw0p2 up
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ip link set dev sw0p1 master br0
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ip link set dev sw0p2 master br0
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[*] bridge vlan add dev br0 vid 1 pvid untagged self
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[*] if vlan_filtering=1. where default_pvid=1
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=================
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# On/off STP
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=================
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ip link set dev BRDEV type bridge stp_state 1/0
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Note. Steps [*] are mandatory.
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====================
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# VLAN configuration
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====================
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bridge vlan add dev br0 vid 1 pvid untagged self <---- add cpu port to VLAN 1
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Note. This step is mandatory for bridge/default_pvid.
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=================
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# Add extra VLANs
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=================
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1. untagged:
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bridge vlan add dev sw0p1 vid 100 pvid untagged master
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bridge vlan add dev sw0p2 vid 100 pvid untagged master
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bridge vlan add dev br0 vid 100 pvid untagged self <---- Add cpu port to VLAN100
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2. tagged:
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bridge vlan add dev sw0p1 vid 100 master
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bridge vlan add dev sw0p2 vid 100 master
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bridge vlan add dev br0 vid 100 pvid tagged self <---- Add cpu port to VLAN100
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====
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FDBs
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====
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FDBs are automatically added on the appropriate switch port upon detection
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Manually adding FDBs:
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bridge fdb add aa:bb:cc:dd:ee:ff dev sw0p1 master vlan 100
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bridge fdb add aa:bb:cc:dd:ee:fe dev sw0p2 master <---- Add on all VLANs
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====
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MDBs
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====
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MDBs are automatically added on the appropriate switch port upon detection
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Manually adding MDBs:
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bridge mdb add dev br0 port sw0p1 grp 239.1.1.1 permanent vid 100
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bridge mdb add dev br0 port sw0p1 grp 239.1.1.1 permanent <---- Add on all VLANs
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==================
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Multicast flooding
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==================
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CPU port mcast_flooding is always on
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Turning flooding on/off on swithch ports:
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bridge link set dev sw0p1 mcast_flood on/off
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==================
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Access and Trunk port
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==================
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bridge vlan add dev sw0p1 vid 100 pvid untagged master
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bridge vlan add dev sw0p2 vid 100 master
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bridge vlan add dev br0 vid 100 self
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ip link add link br0 name br0.100 type vlan id 100
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Note. Setting PVID on Bridge device itself working only for
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default VLAN (default_pvid).
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=====================
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NFS
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=====================
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The only way for NFS to work is by chrooting to a minimal environment when
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switch configuration that will affect connectivity is needed.
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Assuming you are booting NFS with eth1 interface(the script is hacky and
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it's just there to prove NFS is doable).
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setup.sh:
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#!/bin/sh
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mkdir proc
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mount -t proc none /proc
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ifconfig br0 > /dev/null
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if [ $? -ne 0 ]; then
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echo "Setting up bridge"
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ip link add name br0 type bridge
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ip link set dev br0 type bridge ageing_time 1000
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ip link set dev br0 type bridge vlan_filtering 1
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ip link set eth1 down
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ip link set eth1 name sw0p1
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ip link set dev sw0p1 up
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ip link set dev sw0p2 up
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ip link set dev sw0p2 master br0
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ip link set dev sw0p1 master br0
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bridge vlan add dev br0 vid 1 pvid untagged self
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ifconfig sw0p1 0.0.0.0
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udhchc -i br0
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fi
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umount /proc
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run_nfs.sh:
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#!/bin/sh
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mkdir /tmp/root/bin -p
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mkdir /tmp/root/lib -p
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cp -r /lib/ /tmp/root/
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cp -r /bin/ /tmp/root/
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cp /sbin/ip /tmp/root/bin
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cp /sbin/bridge /tmp/root/bin
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cp /sbin/ifconfig /tmp/root/bin
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cp /sbin/udhcpc /tmp/root/bin
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cp /path/to/setup.sh /tmp/root/bin
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chroot /tmp/root/ busybox sh /bin/setup.sh
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run ./run_nfs.sh
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@ -0,0 +1,10 @@
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ale_bypass [DEVICE, DRIVER-SPECIFIC]
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Allows to enable ALE_CONTROL(4).BYPASS mode for debug purposes.
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All packets will be sent to the Host port only if enabled.
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Type: bool
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Configuration mode: runtime
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switch_mode [DEVICE, DRIVER-SPECIFIC]
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Enable switch mode
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Type: bool
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Configuration mode: runtime
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