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+.. SPDX-License-Identifier: BSD-3-Clause
+   Copyright(c) 2022 Intel Corporation
+
+=============================
+ICE IAVF Enable Packet Pacing 
+=============================
+
+Description
+===========
+1. Enable rte_tm to support queue rate limitation configure.
+2. Enable devargs to parse the quanta_size for IGP pacing.
+
+The packet pacing quality is heavily rely on FlexRan application/OS setup.
+For DPDK validation, we will focus on:
+1. Make sure queue rate limitation configuration take effect by measure the bandwidth.
+2. Should not exceed the bandwidth that be limited by the DCF.  
+3. Not to break anything else.
+
+Prerequisites
+=============
+
+Topology
+--------
+DUT port 0 <----> Tester port 0
+
+Hardware
+--------
+Supported NICs: Intel® Ethernet 800 Series E810-XXVDA4/E810-CQ
+
+Software
+--------
+dpdk: http://dpdk.org/git/dpdk
+runtime command: https://doc.dpdk.org/guides/testpmd_app_ug/testpmd_funcs.html
+
+General Set Up
+--------------
+1. Compile DPDK::
+
+    # CC=gcc meson --werror -Denable_kmods=True -Dlibdir=lib --default-library=static <dpdk build dir>
+    # ninja -C <dpdk build dir> -j 110
+
+2. Get the pci device id and interface of DUT and tester.
+   For example, 0000:3b:00.0 and 0000:3b:00.1 is pci device id,
+   ens785f0 and ens785f1 is interface::
+
+    <dpdk dir># ./usertools/dpdk-devbind.py -s
+
+    0000:3b:00.0 'Device 159b' if=ens785f0 drv=ice unused=vfio-pci
+    0000:3b:00.1 'Device 159b' if=ens785f1 drv=ice unused=vfio-pci
+
+3. If vf_num >= 2, Generate 2 VF on PF0, set mac address for VF1::
+
+    # echo 2 > /sys/bus/pci/devices/0000:3b:00.0/sriov_numvfs
+    # ip link set dev ens785f0 vf 0 trust on
+    # ip link set ens785f0 vf 1 mac 00:11:22:33:44:55
+
+   Else, Generate 1 VF on PF0, set mac address for VF0::
+
+    # echo 1 > /sys/bus/pci/devices/0000:3b:00.0/sriov_numvfs
+    # ip link set ens785f0 vf 0 mac 00:11:22:33:44:55
+
+4. Bind the DUT port to dpdk::
+
+    <dpdk dir># ./usertools/dpdk-devbind.py -b vfio-pci <DUT port pci device id>
+
+Test Case
+=========
+Common Steps
+------------
+TREX sends one stream with pkt size 64, mac address is "00:11:22:33:44:55", 100% max rate.
+When check the throughput ratio of each queue, stop the forward and check the TX-packets ratio of queues.
+The TX-packets ratio of queues is same as TX throughput ratio of queues.
+
+Test Case 1: Without quanta size, check peak_tb_rate
+----------------------------------------------------
+Launch testpmd without quanta size, check the TX throughput.
+
+Test Steps
+~~~~~~~~~~
+1. Launch testpmd::
+
+    <dpdk dir># ./<dpdk build dir>/app/dpdk-testpmd -l 1-4 -n 4 -a 0000:3b:01.0 --file-prefix=tx -- -i 
+
+2. Configure rate limit::
+
+    testpmd> port stop all
+    testpmd> add port tm node shaper profile 0 1 1000000 0 612980769 0 0 0 
+    testpmd> add port tm nonleaf node 0 1000 -1 0 1 0 -1 1 0 0 
+    testpmd> add port tm nonleaf node 0 900 1000 0 1 1 -1 1 0 0
+    testpmd> add port tm leaf node 0 0 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> port tm hierarchy commit 0 no
+    testpmd> port start all
+    testpmd> set txpkts 1275
+    testpmd> set fwd mac
+    testpmd> start
+
+3. Send one stream from TREX.
+
+4. Check the TX throughput of port 0::
+
+    testpmd> show port stats 0
+
+   Check the TX throughput is 612MBps.
+
+Test Case 2: Single queue, check peak_tb_rate
+---------------------------------------------
+Launch testpmd with quanta_size=1024, check the TX throughput.
+
+Test Steps
+~~~~~~~~~~
+1. Launch testpmd::
+
+    <dpdk dir># ./<dpdk build dir>/app/dpdk-testpmd -l 1-4 -n 4 -a 0000:3b:01.0,quanta_size=1024 --file-prefix=tx -- -i 
+
+2. Configure rate limit::
+
+    testpmd> port stop all
+    testpmd> add port tm node shaper profile 0 1 1000000 0 612980769 0 0 0 
+    testpmd> add port tm nonleaf node 0 1000 -1 0 1 0 -1 1 0 0 
+    testpmd> add port tm nonleaf node 0 900 1000 0 1 1 -1 1 0 0
+    testpmd> add port tm leaf node 0 0 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> port tm hierarchy commit 0 no
+    testpmd> port start all
+    testpmd> set txpkts 1275
+    testpmd> set fwd mac
+    testpmd> start
+
+3. Send one stream from TREX.
+
+4. Check the TX throughput of port 0::
+
+    testpmd> show port stats 0
+
+   Check the TX throughput is 612MBps.
+
+Test Case 3: Multi queues, check peak_tb_rate
+---------------------------------------------
+Launch testpmd with quanta_size=1024 and multi queues, check the TX throughput and the throughput ratio of each queue.
+
+Test Steps
+~~~~~~~~~~
+1. Launch testpmd with 8 queues::
+
+    <dpdk dir># ./<dpdk build dir>/app/dpdk-testpmd -l 1-4 -n 4 -a 0000:3b:01.0,quanta_size=1024 --file-prefix=tx -- -i --txq=8 --rxq=8
+
+2. Configure each queue with same rate limit::
+
+    testpmd> port stop all
+    testpmd> add port tm node shaper profile 0 1 1000000 0 100000000 0 0 0 
+    testpmd> add port tm nonleaf node 0 1000 -1 0 1 0 -1 1 0 0 
+    testpmd> add port tm nonleaf node 0 900 1000 0 1 1 -1 1 0 0
+    testpmd> add port tm leaf node 0 0 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 1 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 2 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 3 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 4 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 5 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 6 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 7 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> port tm hierarchy commit 0 no
+    testpmd> port start all
+    testpmd> set txpkts 875
+    testpmd> set fwd mac
+    testpmd> start
+
+3. Send one stream from TREX.
+
+4. Check the TX throughput of port 0::
+
+    testpmd> show port stats 0
+
+   Check the TX throughput is 800MBps.
+ 
+   Check the throughput ratio of each queue::
+    
+    testpmd> stop
+
+   Check the TX throughput of queue 0-7 is 1:1:1:1:1:1:1:1.
+
+Test Case 4: Modify quanta_size, check peak_tb_rate
+---------------------------------------------------
+Launch testpmd with quanta_size=4096 and multi queues, check the TX throughput and the throughput ratio of each queue.
+
+Test Steps
+~~~~~~~~~~
+1. Launch testpmd with 8 queues::
+
+    <dpdk dir># ./<dpdk build dir>/app/dpdk-testpmd -l 1-4 -n 4 -a 0000:3b:01.0,quanta_size=4096 --file-prefix=tx -- -i --txq=8 --rxq=8
+
+2. Configure each queue with same rate limit::
+
+    testpmd> port stop all
+    testpmd> add port tm node shaper profile 0 1 1000000 0 100000000 0 0 0 
+    testpmd> add port tm nonleaf node 0 1000 -1 0 1 0 -1 1 0 0 
+    testpmd> add port tm nonleaf node 0 900 1000 0 1 1 -1 1 0 0
+    testpmd> add port tm leaf node 0 0 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 1 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 2 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 3 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 4 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 5 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 6 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 7 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> port tm hierarchy commit 0 no
+    testpmd> port start all
+    testpmd> set txpkts 875
+    testpmd> set fwd mac
+    testpmd> start
+
+3. Send one stream from TREX.
+
+4. Check the TX throughput of port 0::
+
+    testpmd> show port stats 0
+
+   Check the TX throughput is 800MBps.
+ 
+   Check the throughput ratio of each queue::
+    
+    testpmd> stop
+
+   Check the TX throughput of queue 0-7 is 1:1:1:1:1:1:1:1.
+
+Test Case 5: Invalid quanta_size, check peak_tb_rate
+----------------------------------------------------
+The scope of quanta size is [256, 4096], and it should be the product of 64.
+Launch testpmd with quanta_size=1000, check it shows invalid quanta size.
+
+Test Steps
+~~~~~~~~~~
+1. Launch testpmd::
+
+    <dpdk dir># ./<dpdk build dir>/app/dpdk-testpmd -l 1-4 -n 4 -a 0000:3b:01.0,quanta_size=1000 --file-prefix=tx -- -i 
+
+2. check it shows invalid quanta size.
+
+Test Case 6: Multi queues with different rate limit, check peak_tb_rate
+-----------------------------------------------------------------------
+Launch testpmd with quanta_size=1024 and multi queues, then configure each queue with diff rate limit,
+check the TX throughput and the throughput ratio of each queue.
+
+Test Steps
+~~~~~~~~~~
+1. Launch testpmd with 8 queues::
+
+    <dpdk dir># ./<dpdk build dir>/app/dpdk-testpmd -l 1-4 -n 4 -a 0000:3b:01.0,quanta_size=1024 --file-prefix=tx -- -i --txq=8 --rxq=8
+
+2. Configure each queue with diff rate limit::
+
+    testpmd> port stop all
+    testpmd> add port tm node shaper profile 0 1 1000000 0 10000000 0 0 0
+    testpmd> add port tm node shaper profile 0 2 1000000 0 20000000 0 0 0
+    testpmd> add port tm node shaper profile 0 3 1000000 0 30000000 0 0 0
+    testpmd> add port tm node shaper profile 0 4 1000000 0 40000000 0 0 0
+    testpmd> add port tm node shaper profile 0 5 1000000 0 50000000 0 0 0
+    testpmd> add port tm node shaper profile 0 6 1000000 0 60000000 0 0 0
+    testpmd> add port tm node shaper profile 0 7 1000000 0 70000000 0 0 0
+    testpmd> add port tm node shaper profile 0 8 1000000 0 80000000 0 0 0
+    testpmd> add port tm nonleaf node 0 1000 -1 0 1 0 -1 1 0 0 
+    testpmd> add port tm nonleaf node 0 900 1000 0 1 1 -1 1 0 0
+    testpmd> add port tm leaf node 0 0 900 0 1 2 1 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 1 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 2 900 0 1 2 3 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 3 900 0 1 2 4 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 4 900 0 1 2 5 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 5 900 0 1 2 6 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 6 900 0 1 2 7 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 0 7 900 0 1 2 8 0 0xffffffff 0 0
+    testpmd> port tm hierarchy commit 0 no
+    testpmd> port start all
+    testpmd> set txpkts 1275
+    testpmd> set fwd txonly
+    testpmd> start
+
+3. Send one stream from TREX.
+
+4. Check the TX throughput of port 0::
+
+    testpmd> show port stats 0
+
+   Check the TX throughput is 360MBps.
+ 
+   Check the throughput ratio of each queue::
+    
+    testpmd> stop
+
+   Check the TX throughput of queue 0-7 is 1:2:3:4:5:6:7:8.
+
+Test Case 7: Port rate limit less than queue rate limit
+-------------------------------------------------------
+Launch dcf testpmd with quanta_size=1024 and multi queues, then configure port rate limit less than queue rate limit,
+check the TX throughput and the throughput ratio of each queue.
+
+Test Steps
+~~~~~~~~~~
+1. Launch dcf testpmd with 8 queues::
+
+    <dpdk dir># ./<dpdk build dir>/app/dpdk-testpmd -l 1-4 -n 4 -a 0000:3b:01.0,cap=dcf -a 3b:01.1,quanta_size=1024 --file-prefix=tx -- -i --txq=8 --rxq=8 --port-topology=loop
+
+2. Configure port rate limit less than queue rate limit::
+
+    testpmd> port stop all
+    testpmd> add port tm node shaper profile 0 1 1000000 0 100000000 0 0 0   
+    testpmd> add port tm node shaper profile 1 2 1000000 0 612980769 0 0 0   
+    testpmd> add port tm nonleaf node 0 1000 -1 0 1 0 -1 1 0 0              
+    testpmd> add port tm nonleaf node 0 900 1000 0 1 1 -1 1 0 0          
+    testpmd> add port tm leaf node 0 0 900 0 1 2 1 0 0xffffffff 0 0         
+    testpmd> add port tm leaf node 0 1 900 0 1 2 1 0 0xffffffff 0 0         
+    testpmd> add port tm nonleaf node 1 1000 -1 0 1 0 -1 1 0 0
+    testpmd> add port tm nonleaf node 1 900 1000 0 1 1 -1 1 0 0          
+    testpmd> add port tm leaf node 1 0 900 0 1 2 2 0 0xffffffff 0 0         
+    testpmd> add port tm leaf node 1 1 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 1 2 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 1 3 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 1 4 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 1 5 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 1 6 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 1 7 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> port tm hierarchy commit 0 no
+    testpmd> port tm hierarchy commit 1 no  
+    testpmd> port start all
+    testpmd> set txpkts 1275
+    testpmd> set fwd mac
+    testpmd> start
+
+3. Send one stream from TREX.
+
+4. Check the TX throughput of port 1::
+
+    testpmd> show port stats 1
+
+   Check the TX throughput is 100MBps.
+ 
+   Check the throughput ratio of each queue::
+    
+    testpmd> stop
+
+   Check the TX throughput of port1 queue 0-7 is 1:1:1:1:1:1:1:1.
+
+Test Case 8: Port rate limit more than queue rate limit
+-------------------------------------------------------
+Launch dcf testpmd with quanta_size=1024 and multi queues, then configure port rate limit more than queue rate limit,
+check the TX throughput and the throughput ratio of each queue.
+
+Test Steps
+~~~~~~~~~~
+1. Launch dcf testpmd with 8 queues::
+
+    <dpdk dir># ./<dpdk build dir>/app/dpdk-testpmd -l 1-4 -n 4 -a 0000:3b:01.0,cap=dcf -a 3b:01.1,quanta_size=1024 --file-prefix=tx -- -i --txq=8 --rxq=8 --port-topology=loop
+
+2. Configure port rate limit more than queue rate limit::
+
+    testpmd> port stop all
+    testpmd> add port tm node shaper profile 0 1 1000000 0 200000000 0 0 0   
+    testpmd> add port tm node shaper profile 1 2 1000000 0 10000000 0 0 0   
+    testpmd> add port tm nonleaf node 0 1000 -1 0 1 0 -1 1 0 0              
+    testpmd> add port tm nonleaf node 0 900 1000 0 1 1 -1 1 0 0          
+    testpmd> add port tm leaf node 0 0 900 0 1 2 1 0 0xffffffff 0 0         
+    testpmd> add port tm leaf node 0 1 900 0 1 2 1 0 0xffffffff 0 0         
+    testpmd> add port tm nonleaf node 1 1000 -1 0 1 0 -1 1 0 0
+    testpmd> add port tm nonleaf node 1 900 1000 0 1 1 -1 1 0 0          
+    testpmd> add port tm leaf node 1 0 900 0 1 2 2 0 0xffffffff 0 0         
+    testpmd> add port tm leaf node 1 1 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 1 2 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 1 3 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 1 4 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 1 5 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 1 6 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> add port tm leaf node 1 7 900 0 1 2 2 0 0xffffffff 0 0
+    testpmd> port tm hierarchy commit 0 no
+    testpmd> port tm hierarchy commit 1 no  
+    testpmd> port start all
+    testpmd> set txpkts 1275
+    testpmd> set fwd mac
+    testpmd> start
+
+3. Send one stream from TREX.
+
+4. Check the TX throughput of port 1::
+
+    testpmd> show port stats 1
+
+   Check the TX throughput is 80MBps.
+ 
+   Check the throughput ratio of each queue::
+    
+    testpmd> stop
+
+   Check the TX throughput of port1 queue 0-7 is 1:1:1:1:1:1:1:1.
+
