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  • Enhanced Time Synchronization using IEEE 802.1AS

  • Ethernet AVB (Audio Video Bridging, IEEE 802.1Qav)

  • Frame Replication and Elimination for Reliability IEEE 802.1CB
  • Enhancements for Scheduled Traffic IEEE 802.1Qbv
  • Per-Stream Filtering and Policing, IEEE 802.1 Qci
  • Enhancements and Performance Improvements, IEEE 802.1Qcc
  • Frame Preemption, IEEE 802.1Qbu
  • Interspersing Express Traffic, IEEE 802.3br


Software support

TSN kernel drivers are currently support in Xilinx Linux staging area: https://github.com/Xilinx/linux-xlnx/tree/xilinx-v2022.1/drivers/staging/xilinx-tsn

TSN user space utilities and sample configurations are provided to enable TSN functionality. Please refer to TSN SW user guide and following sections for more details.

Kernel Configuration

The following config options should be enabled in order to build the TSN Subsystem:

CONFIG_XILINX_TSN

CONFIG_AXIENET_HAS_TADMA

CONFIG_XILINX_TSN_PTP

CONFIG_XILINX_TSN_QBV

CONFIG_XILINX_TSN_SWITCH

CONFIG_XILINX_TSN_QCI

CONFIG_XILINX_TSN_CB

CONFIG_XILINX_TSN_QBR


The following additional config is required/selected by TSN subsystem:

CONFIG_NET_SWITCHDEV
CONFIG_STP
CONFIG_NETFILTER

Devicetree

TSN subsystem DT documentation can be found here: Documentation/devicetree/bindings/staging/net/xilinx_tsn.txt

For TSN TEMAC, please refer to Documentation/devicetree/bindings/staging/net/xilinx-tsn-ethernet.txt

For TSN Switch, please refer to Documentation/devicetree/bindings/staging/net/xilinx_tsn_switch.txt

For TSN Endpoint, please refer to Documentation/devicetree/bindings/staging/net/xilinx_tsn_ep.txt

For TSN Extended Endpoint, please refer to Documentation/devicetree/bindings/staging/net/xilinx_tsn_ep_ex.txt

Please refer to PL Ethernet and DMA documentation for additional information: Documentation/devicetree/bindings/net/xilinx_axienet.txt

For more details on phy bindings please refer "Documentation/devicetree/bindings/net/phy.txt"

TSN System

  • Xilinx’s TSN IP Switch have three ports Endpoint (Port 0), MAC1 (Port 1) and MAC2 (Port 2)
  • Endpoint is connected to MCDMA (Multichannel DMA), each MCDMA channel is a dedicated channel for each type of traffic, i.e. Best Effort, Scheduled Traffic and Reserved. There could be other use cases where there would be separate channels for management traffic
  • MAC1 is connected to external world by PHY1
  • MAC2 is connected to external world by PHY2      

...

               

axi_intc_0: interrupt-controller@80001000 {

                        #interrupt-cells = <2>;

                        clock-names = "s_axi_aclk";

                        clocks = <&misc_clk_1>;

                        compatible = "xlnx,axi-intc-4.1", "xlnx,xps-intc-1.00.a";

                        interrupt-controller ;

                        interrupt-names = "irq";

                        interrupt-parent = <&gic>;

                        interrupts = <0 89 4>;

                        reg = <0x0 0x80001000 0x0 0x1000>;

                        xlnx,kind-of-intr = <0x8000>;

                        xlnx,num-intr-inputs = <0x10>;

                };

;

                };



Mainline status

TSN driver is not currently upstreamed.

Known issues and troubleshooting

...

  • Increase tx_timestamp_timeout to 10 in PTP config file. If using a board to board setup, this can be updated on both master and slave config to account for increased TX and RX traffic.
  • If using tsn_talker to send traffic, no more than 3 instances of tsn talker can be used at full throughput with packet size of 1472.

→ Dynamic devicetree overlay is not supported with TSN 2022.1 kernel driver.

→ TSN PCP values are mandatory and there are no default values for PCP if not chosen as described in the section "PCP and Traffic Class".


Changelog

2022.1

  • TSN kernel driver support added to staging area

https://github.com/Xilinx/linux-xlnx/tree/xilinx-v2022.1/drivers/staging/xilinx-tsn