xxv_ethernet_0: ethernet@80020000 {
axistream-connected = <&axi_dma_hier_axi_mcdma_0>;
axistream-control-connected = <&axi_dma_hier_axi_mcdma_0>;
clock-frequency = <100000000>;
clock-names = "rx_core_clk_0", "dclk", "s_axi_aclk_0";
clocks = <&misc_clk_0>, <&clk 72>, <&clk 71>;
compatible = "xlnx,xxv-ethernet-2.5", "xlnx,xxv-ethernet-1.0";
device_type = "network";
local-mac-address = [00 0a 35 00 00 00];
phy-mode = "base-r";
reg = <0x0 0x80020000 0x0 0x10000>;
xlnx = <0x0>;
xlnx,add-gt-cntrl-sts-ports = <0x0>;
xlnx,anlt-clk-in-mhz = <0x64>;
xlnx,axis-tdata-width = <0x40>;
xlnx,axis-tkeep-width = <0x7>;
xlnx,base-r-kr = "BASE-R";
xlnx,channel-ids = "1","2","3","4","5","6","7","8","9","a","b","c","d","e","f","10";
xlnx,clocking = "Asynchronous";
xlnx,core = "Ethernet MAC+PCS/PMA 64-bit";
xlnx,data-path-interface = "AXI Stream";
xlnx,enable-datapath-parity = <0x0>;
xlnx,enable-pipeline-reg = <0x0>;
xlnx,enable-preemption = <0x0>;
xlnx,enable-preemption-fifo = <0x0>;
xlnx,enable-rx-flow-control-logic = <0x0>;
xlnx,enable-time-stamping = <0x1>;
xlnx,enable-tx-flow-control-logic = <0x0>;
xlnx,enable-vlane-adjust-mode = <0x0>;
xlnx,family-chk = "zynquplus";
xlnx,fast-sim-mode = <0x0>;
xlnx,gt-diffctrl-width = <0x4>;
xlnx,gt-drp-clk = "100.00";
xlnx,gt-group-select = "Quad X0Y0";
xlnx,gt-location = <0x1>;
xlnx,gt-ref-clk-freq = "156.25";
xlnx,gt-type = "GTH";
xlnx,include-auto-neg-lt-logic = "None";
xlnx,include-axi4-interface = <0x1>;
xlnx,include-fec-logic = <0x0>;
xlnx,include-rsfec-logic = <0x0>;
xlnx,include-shared-logic = <0x1>;
xlnx,include-user-fifo = <0x1>;
xlnx,lane1-gt-loc = "X0Y4";
xlnx,lane2-gt-loc = "NA";
xlnx,lane3-gt-loc = "NA";
xlnx,lane4-gt-loc = "NA";
xlnx,line-rate = <0xa>;
xlnx,mii-ctrl-width = <0x4>;
xlnx,mii-data-width = <0x20>;
xlnx,num-of-cores = <0x1>;
xlnx,num-queues = /bits/ 16 <0x10>;
xlnx,ptp-clocking-mode = <0x0>;
xlnx,ptp-operation-mode = <0x2>;
xlnx,runtime-switch = <0x0>;
xlnx,rxmem = <0x40000>;
xlnx,switch-1-10-25g = <0x0>;
xlnx,tx-latency-adjust = <0x0>;
xlnx,tx-total-bytes-width = <0x4>;
xlnx,xgmii-interface = <0x1>;
interrupt-names = "mm2s_ch1_introut", "mm2s_ch2_introut", "mm2s_ch3_introut", "mm2s_ch4_introut", "mm2s_ch5_introut", "mm2s_ch6_introut", "mm2s_ch7_introut", "mm2s_ch8_introut", "mm2s_ch9_introut", "mm2s_ch10_introut", "mm2s_ch11_introut", "mm2s_ch12_introut", "mm2s_ch13_introut", "mm2s_ch14_introut", "mm2s_ch15_introut", "mm2s_ch16_introut", "s2mm_ch1_introut", "s2mm_ch2_introut", "s2mm_ch3_introut", "s2mm_ch4_introut", "s2mm_ch5_introut", "s2mm_ch6_introut", "s2mm_ch7_introut", "s2mm_ch8_introut", "s2mm_ch9_introut", "s2mm_ch10_introut", "s2mm_ch11_introut", "s2mm_ch12_introut", "s2mm_ch13_introut", "s2mm_ch14_introut", "s2mm_ch15_introut", "s2mm_ch16_introut";
interrupt-parent = <&gic>;
interrupts = <0 89 4 0 89 4 0 89 4 0 89 4 0 89 4 0 89 4 0 89 4 0 89 4 0 89 4 0 89 4 0 89 4 0 89 4 0 89 4 0 89 4 0 89 4 0 89 4 0 90 4 0 90 4 0 90 4 0 90 4 0 90 4 0 90 4 0 90 4 0 90 4 0 90 4 0 90 4 0 90 4 0 90 4 0 90 4 0 90 4 0 90 4 0 90 4>;
xxv_ethernet_0_mdio: mdio {
#address-cells = <1>;
#size-cells = <0>;
};
};
- The driver supports random Queue/Channel selection.
- The driver supports channel observer feature through sysfs. T his custom feature is useful in multi-core (Observer) system where MCDMA is a shared resource for all cores. MCDMA IP supports a maximum of six cores and 16 Channels can be distributed across each core as a static configuration. The Channel Observer is available for each group and provides the status about the channels in a group being serviced.
- The driver supports per channel weight configuration through sysfs. This custom feature specifies the channel weight i.e number of packets to be sent in one iteration.
-
The driver supports Linux multiqueue networking. It uses the alloc_etherdev_mq() function to allocate the subqueues for the device.
The userspace command 'tc,' part of the iproute2 package, is used to configure qdiscs. To add the MULTIQ qdisc assuming the device is called eth0, run the following command:
# tc qdisc add dev eth0 root handle 1: multiq
The qdisc will allocate the number of bands to equal the number of queues that the device reports, and bring the qdisc online.
Assuming eth0 has 4 Tx queues, the band mapping would look like:
band 0 => queue 0 band 1 => queue 1 band 2 => queue 2 band 3 => queue 3
The behavior of tc filters remains the same. However, a new tc action, skbedit, has been added. Assuming we want to route all traffic to a specific host, for example 192.168.0.3, through a specific queue we could use this action and establish a filter such as:
# tc filter add dev eth0 parent 1: protocol ip prio 1 u32 match ip dst 192.168.0.3 action skbedit queue_mapping 3
For details refer Linux kernel Documentation/networking/multiqueue.txt