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Miller" , Ivan Khoronzhuk , Jiri Pirko CC: Florian Fainelli , Sekhar Nori , , , Murali Karicheri , Ivan Vecera , Grygorii Strashko Subject: [RFC PATCH v3 net-next 10/11] Documentation: networking: add cpsw switchdev based driver documentation Date: Thu, 25 Apr 2019 01:24:26 +0300 Message-ID: <1556144667-27997-11-git-send-email-grygorii.strashko@ti.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1556144667-27997-1-git-send-email-grygorii.strashko@ti.com> References: <1556144667-27997-1-git-send-email-grygorii.strashko@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ilias Apalodimas A new cpsw dirver based on switchdev was added. Add documentation about basic configuration and future features Signed-off-by: Ilias Apalodimas Signed-off-by: Grygorii Strashko --- .../device_drivers/ti/cpsw_switchdev.txt | 159 ++++++++++++++++++ 1 file changed, 159 insertions(+) create mode 100644 Documentation/networking/device_drivers/ti/cpsw_switchdev.txt -- 2.17.1 diff --git a/Documentation/networking/device_drivers/ti/cpsw_switchdev.txt b/Documentation/networking/device_drivers/ti/cpsw_switchdev.txt new file mode 100644 index 000000000000..471e831365f0 --- /dev/null +++ b/Documentation/networking/device_drivers/ti/cpsw_switchdev.txt @@ -0,0 +1,159 @@ +* Texas Instruments CPSW switchdev based ethernet driver + +- 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 + +SUBSYSTEM=="net", ACTION=="add", ATTR{phys_switch_id}==, \ + ATTR{phys_port_name}!="", NAME="sw0$attr{phys_port_name}" + +- The new (cpsw_new.c) driver is operating in dual-emac mode by default, thus +working as 2 individual network interfaces. When the both interfaces joined +the bridge - CPSW driver will enter a switch mode and discard dual_mac +configuration. All configuration is implemented via switchdev API. + +CPSW will be switched back to dual_mac mode if any port leaves the bridge. +ALE table is completely cleared and then refilled while switching between modes +and introduces some limitation to bridge setup sequence. + +==================== +# Bridge setup +==================== +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 0 +[*]echo 0 > /sys/class/net/br0/bridge/default_vlan +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 +... +[*]echo 1 > /sys/class/net/br0/bridge/default_vlan +[*]ip link set dev br0 type bridge vlan_filtering 1 + + +================= +# On/off STP +================= +ip link set dev BRDEV type bridge stp_state 1/0 + +Note. Steps [*] are mandatory. + +==================== +# 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_vlan. + +================= +# 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 uppon 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 uppon 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 101 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 + - or - + [TBD] bridge vlan add dev br0 vid 100 untagged self + + Note. Setting PVID on Bridge device itself working only for default VLAN, + but CPSW Host P0 port allows to configure it - need evaluation. + +===================== + 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). + +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 + + 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 + +run_nfs.sh: +#!/bin/sh +mkdir /tmp/root/bin -p +mkdir /tmp/root/lib -p + +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 + +run ./run_nfs.sh + +===================== +Currently unsupported +===================== +1. ageing configuration +2. Multicast flooding on/off for the CPU port +3. Discovered FDBs/MDBs do not appear on 'bridge fdb/mdb show' +4. VLANs offloading +5. STP \ No newline at end of file