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AM6422: eth0 set iet-frame-preemption fail

fenghua jiang
Intellectual 631 points

https://software-dl.ti.com/processor-sdk-linux-rt/esd/docs/08_00_00_21/linux/Foundational_Components/Kernel/Kernel_Drivers/Network/CPSW3g.html#intersperse-express-traffic-iet-frame-preemption-offload

To enable IET FPE with MAC Verify, do

ethtool --set-priv-flags eth0 p0-rx-ptype-rrobin off
ethtool --set-priv-flags eth0 iet-frame-preemption on
ethtool --set-priv-flags eth0 iet-mac-verify on

but
root@am64xx-evm:~# ethtool --set-priv-flags eth0 iet-frame-preemption on
netlink error: Device or resource busy
how to solve the problem?
  • +1
    TI__Mastermind 27050 points

    Hi,

    See https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1009997/am6442-linux-time-sensitive-networking-on-sitara-processors-including-am64x and specifically slide 15 for detailed step by step. I suspect you are missing configuring the devices (both Ethernet ports connected to CPSW3G) down before reconfiguring to have IET on:

    echo "Script to initialize AM64x Ethernet ports (CPSW3G) as hardware based 802.1Q cut-through";
echo "bridge using ip and devlink commands.";
echo
echo "setting cut-thru and preemption for VLAN PCP 3 , bitmask 8 0b00001000";
echo
#take the interfaces down, by default dual MAC
ip link set dev eth0 down
ip link set dev eth1 down
# two queues one express, one non-express, and SMD level verify on
ethtool -L eth0 tx 2
ethtool -L eth1 tx 2
ethtool --set-priv-flags eth0 p0-rx-ptype-rrobin off
ethtool --set-priv-flags eth0 iet-frame-preemption on
ethtool --set-priv-flags eth0 iet-mac-verify on
ethtool --set-priv-flags eth1 p0-rx-ptype-rrobin off
ethtool --set-priv-flags eth1 iet-frame-preemption on
ethtool --set-priv-flags eth1 iet-mac-verify on
#tell the kernel hw switch to turn on switching
devlink dev param set platform/8000000.ethernet name switch_mode value true cmode runtime
#setup Q7 of 8 queues to have cut-thru on
echo 8 > /sys/kernel/debug/8000000.ethernet/Port1/cut_thru_rx_pri_mask
echo 8 > /sys/kernel/debug/8000000.ethernet/Port1/cut_thru_tx_pri_mask
echo 8 > /sys/kernel/debug/8000000.ethernet/Port2/cut_thru_rx_pri_mask
echo 8 > /sys/kernel/debug/8000000.ethernet/Port2/cut_thru_tx_pri_mask
ethtool --set-priv-flags eth0 cut-thru on
ethtool --set-priv-flags eth1 cut-thru on
#setup a host port called br0
ip link add name br0 type bridge
ip link set dev br0 type bridge ageing_time 1000
#bring up th external Ethernet MACs, sleep is there to allow the link negotiation to go through
ip link set dev eth0 up
sleep 1
ip link set dev eth1 up
sleep 1
#connect the external MACs to the host port
ip link set dev eth0 master br0
ip link set dev eth1 master br0
#tell that the host port is part of the bridge
ip link set dev br0 type bridge stp_state 1
#bring the host port up
ip link set dev br0 up
#CPSW switch comes up in vlan aware mode, with ports blocked by default
#vlan id 1 is used for untagged traffic with VLANs, this unblock the untagged traffic to br0 port
bridge vlan add dev br0 vid 1 pvid untagged self
#echo spanning tree for the switch
brctl showstp br0
#get an IP address for the host port using DHCP
udhcpc -i br0

      Pekka