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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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Nov 20, 2019
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Documentation/networking/device_drivers/ti/cpsw_switchdev.txt
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* Texas Instruments CPSW switchdev based ethernet driver 2.0 | ||
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- Port renaming | ||
On older udev versions renaming of ethX to swXpY will not be automatically | ||
supported | ||
In order to rename via udev: | ||
ip -d link show dev sw0p1 | grep switchid | ||
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SUBSYSTEM=="net", ACTION=="add", ATTR{phys_switch_id}==<switchid>, \ | ||
ATTR{phys_port_name}!="", NAME="sw0$attr{phys_port_name}" | ||
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==================== | ||
# Dual mac mode | ||
==================== | ||
- The new (cpsw_new.c) driver is operating in dual-emac mode by default, thus | ||
working as 2 individual network interfaces. Main differences from legacy CPSW | ||
driver are: | ||
- optimized promiscuous mode: The P0_UNI_FLOOD (both ports) is enabled in | ||
addition to ALLMULTI (current port) instead of ALE_BYPASS. | ||
So, Ports in promiscuous mode will keep possibility of mcast and vlan filtering, | ||
which is provides significant benefits when ports are joined to the same bridge, | ||
but without enabling "switch" mode, or to different bridges. | ||
- learning disabled on ports as it make not too much sense for | ||
segregated ports - no forwarding in HW. | ||
- enabled basic support for devlink. | ||
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devlink dev show | ||
platform/48484000.switch | ||
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devlink dev param show | ||
platform/48484000.switch: | ||
name switch_mode type driver-specific | ||
values: | ||
cmode runtime value false | ||
name ale_bypass type driver-specific | ||
values: | ||
cmode runtime value false | ||
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Devlink configuration parameters | ||
==================== | ||
See Documentation/networking/devlink-params-ti-cpsw-switch.txt | ||
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==================== | ||
# Bridging in dual mac mode | ||
==================== | ||
The dual_mac mode requires two vids to be reserved for internal purposes, | ||
which, by default, equal CPSW Port numbers. As result, bridge has to be | ||
configured in vlan unaware mode or default_pvid has to be adjusted. | ||
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ip link add name br0 type bridge | ||
ip link set dev br0 type bridge vlan_filtering 0 | ||
echo 0 > /sys/class/net/br0/bridge/default_pvid | ||
ip link set dev sw0p1 master br0 | ||
ip link set dev sw0p2 master br0 | ||
- or - | ||
ip link add name br0 type bridge | ||
ip link set dev br0 type bridge vlan_filtering 0 | ||
echo 100 > /sys/class/net/br0/bridge/default_pvid | ||
ip link set dev br0 type bridge vlan_filtering 1 | ||
ip link set dev sw0p1 master br0 | ||
ip link set dev sw0p2 master br0 | ||
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==================== | ||
# Enabling "switch" | ||
==================== | ||
The Switch mode can be enabled by configuring devlink driver parameter | ||
"switch_mode" to 1/true: | ||
devlink dev param set platform/48484000.switch \ | ||
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 | ||
Port's netdev devices have to be in UP before joining to the bridge to avoid | ||
overwriting of bridge configuration as CPSW switch driver copletly reloads its | ||
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 | ||
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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==================== | ||
# Bridge setup | ||
==================== | ||
devlink dev param set platform/48484000.switch \ | ||
name switch_mode value 1 cmode runtime | ||
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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 | ||
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[*] if vlan_filtering=1. where default_pvid=1 | ||
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================= | ||
# On/off STP | ||
================= | ||
ip link set dev BRDEV type bridge stp_state 1/0 | ||
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Note. Steps [*] are mandatory. | ||
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==================== | ||
# VLAN configuration | ||
==================== | ||
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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================= | ||
# 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 | ||
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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 | ||
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==== | ||
FDBs | ||
==== | ||
FDBs are automatically added on the appropriate switch port upon detection | ||
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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 | ||
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==== | ||
MDBs | ||
==== | ||
MDBs are automatically added on the appropriate switch port upon detection | ||
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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 | ||
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================== | ||
Multicast flooding | ||
================== | ||
CPU port mcast_flooding is always on | ||
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Turning flooding on/off on swithch ports: | ||
bridge link set dev sw0p1 mcast_flood on/off | ||
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================== | ||
Access and Trunk port | ||
================== | ||
bridge vlan add dev sw0p1 vid 100 pvid untagged master | ||
bridge vlan add dev sw0p2 vid 100 master | ||
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bridge vlan add dev br0 vid 100 self | ||
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 | ||
default VLAN (default_pvid). | ||
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===================== | ||
NFS | ||
===================== | ||
The only way for NFS to work is by chrooting to a minimal environment when | ||
switch configuration that will affect connectivity is needed. | ||
Assuming you are booting NFS with eth1 interface(the script is hacky and | ||
it's just there to prove NFS is doable). | ||
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setup.sh: | ||
#!/bin/sh | ||
mkdir proc | ||
mount -t proc none /proc | ||
ifconfig br0 > /dev/null | ||
if [ $? -ne 0 ]; then | ||
echo "Setting up bridge" | ||
ip link add name br0 type bridge | ||
ip link set dev br0 type bridge ageing_time 1000 | ||
ip link set dev br0 type bridge vlan_filtering 1 | ||
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ip link set eth1 down | ||
ip link set eth1 name sw0p1 | ||
ip link set dev sw0p1 up | ||
ip link set dev sw0p2 up | ||
ip link set dev sw0p2 master br0 | ||
ip link set dev sw0p1 master br0 | ||
bridge vlan add dev br0 vid 1 pvid untagged self | ||
ifconfig sw0p1 0.0.0.0 | ||
udhchc -i br0 | ||
fi | ||
umount /proc | ||
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run_nfs.sh: | ||
#!/bin/sh | ||
mkdir /tmp/root/bin -p | ||
mkdir /tmp/root/lib -p | ||
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cp -r /lib/ /tmp/root/ | ||
cp -r /bin/ /tmp/root/ | ||
cp /sbin/ip /tmp/root/bin | ||
cp /sbin/bridge /tmp/root/bin | ||
cp /sbin/ifconfig /tmp/root/bin | ||
cp /sbin/udhcpc /tmp/root/bin | ||
cp /path/to/setup.sh /tmp/root/bin | ||
chroot /tmp/root/ busybox sh /bin/setup.sh | ||
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run ./run_nfs.sh |
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Documentation/networking/devlink-params-ti-cpsw-switch.txt
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ale_bypass [DEVICE, DRIVER-SPECIFIC] | ||
Allows to enable ALE_CONTROL(4).BYPASS mode for debug purposes. | ||
All packets will be sent to the Host port only if enabled. | ||
Type: bool | ||
Configuration mode: runtime | ||
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switch_mode [DEVICE, DRIVER-SPECIFIC] | ||
Enable switch mode | ||
Type: bool | ||
Configuration mode: runtime |