d629b7b5fe
Fix spelling errors in the guide docs. Signed-off-by: John McNamara <john.mcnamara@intel.com> Acked-by: Rami Rosen <ramirose@gmail.com>
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5.7 KiB
ReStructuredText
156 lines
5.7 KiB
ReStructuredText
.. SPDX-License-Identifier: BSD-3-Clause
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Copyright(c) 2010-2014 Intel Corporation.
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QoS Metering Sample Application
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===============================
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The QoS meter sample application is an example that demonstrates the use of DPDK to provide QoS marking and metering,
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as defined by RFC2697 for Single Rate Three Color Marker (srTCM) and RFC 2698 for Two Rate Three Color Marker (trTCM) algorithm.
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Overview
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--------
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The application uses a single thread for reading the packets from the RX port,
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metering, marking them with the appropriate color (green, yellow or red) and writing them to the TX port.
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A policing scheme can be applied before writing the packets to the TX port by dropping or
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changing the color of the packet in a static manner depending on both the input and output colors of the packets that are processed by the meter.
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The operation mode can be selected as compile time out of the following options:
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* Simple forwarding
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* srTCM color blind
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* srTCM color aware
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* srTCM color blind
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* srTCM color aware
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Please refer to RFC2697 and RFC2698 for details about the srTCM and trTCM configurable parameters
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(CIR, CBS and EBS for srTCM; CIR, PIR, CBS and PBS for trTCM).
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The color blind modes are functionally equivalent with the color-aware modes when
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all the incoming packets are colored as green.
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Compiling the Application
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-------------------------
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To compile the sample application see :doc:`compiling`.
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The application is located in the ``qos_meter`` sub-directory.
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Running the Application
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-----------------------
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The application execution command line is as below:
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.. code-block:: console
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./qos_meter [EAL options] -- -p PORTMASK
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The application is constrained to use a single core in the EAL core mask and 2 ports only in the application port mask
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(first port from the port mask is used for RX and the other port in the core mask is used for TX).
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Refer to *DPDK Getting Started Guide* for general information on running applications and
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the Environment Abstraction Layer (EAL) options.
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Explanation
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-----------
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Selecting one of the metering modes is done with these defines:
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.. code-block:: c
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#define APP_MODE_FWD 0
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#define APP_MODE_SRTCM_COLOR_BLIND 1
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#define APP_MODE_SRTCM_COLOR_AWARE 2
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#define APP_MODE_TRTCM_COLOR_BLIND 3
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#define APP_MODE_TRTCM_COLOR_AWARE 4
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#define APP_MODE APP_MODE_SRTCM_COLOR_BLIND
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To simplify debugging (for example, by using the traffic generator RX side MAC address based packet filtering feature),
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the color is defined as the LSB byte of the destination MAC address.
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The traffic meter parameters are configured in the application source code with following default values:
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.. code-block:: c
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struct rte_meter_srtcm_params app_srtcm_params[] = {
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{.cir = 1000000 * 46, .cbs = 2048, .ebs = 2048},
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};
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struct rte_meter_trtcm_params app_trtcm_params[] = {
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{.cir = 1000000 * 46, .pir = 1500000 * 46, .cbs = 2048, .pbs = 2048},
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};
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Assuming the input traffic is generated at line rate and all packets are 64 bytes Ethernet frames (IPv4 packet size of 46 bytes)
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and green, the expected output traffic should be marked as shown in the following table:
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.. _table_qos_metering_1:
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.. table:: Output Traffic Marking
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+-------------+------------------+-------------------+----------------+
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| **Mode** | **Green (Mpps)** | **Yellow (Mpps)** | **Red (Mpps)** |
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+=============+==================+===================+================+
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| srTCM blind | 1 | 1 | 12.88 |
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+-------------+------------------+-------------------+----------------+
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| srTCM color | 1 | 1 | 12.88 |
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+-------------+------------------+-------------------+----------------+
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| trTCM blind | 1 | 0.5 | 13.38 |
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+-------------+------------------+-------------------+----------------+
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| trTCM color | 1 | 0.5 | 13.38 |
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+-------------+------------------+-------------------+----------------+
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| FWD | 14.88 | 0 | 0 |
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+-------------+------------------+-------------------+----------------+
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To set up the policing scheme as desired, it is necessary to modify the main.h source file,
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where this policy is implemented as a static structure, as follows:
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.. code-block:: c
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int policer_table[e_RTE_METER_COLORS][e_RTE_METER_COLORS] =
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{
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{ GREEN, RED, RED},
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{ DROP, YELLOW, RED},
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{ DROP, DROP, RED}
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};
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Where rows indicate the input color, columns indicate the output color,
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and the value that is stored in the table indicates the action to be taken for that particular case.
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There are four different actions:
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* GREEN: The packet's color is changed to green.
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* YELLOW: The packet's color is changed to yellow.
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* RED: The packet's color is changed to red.
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* DROP: The packet is dropped.
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In this particular case:
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* Every packet which input and output color are the same, keeps the same color.
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* Every packet which color has improved is dropped (this particular case can't happen, so these values will not be used).
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* For the rest of the cases, the color is changed to red.
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.. note::
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* In color blind mode, first row GREEN color is only valid.
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* To drop the packet, policer_table action has to be set to DROP.
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