1 .. SPDX-License-Identifier: BSD-3-Clause
2 Copyright(c) 2020 Intel Corporation.
5 DPDK Telemetry User Guide
6 =========================
8 The Telemetry library provides users with the ability to query DPDK for
9 telemetry information, currently including information such as ethdev stats,
10 ethdev port list, and eal parameters.
14 This library is experimental and the output format may change in the future.
20 The :doc:`../prog_guide/telemetry_lib` opens a socket with path
21 *<runtime_directory>/dpdk_telemetry.<version>*. The version represents the
22 telemetry version, the latest is v2. For example, a client would connect to a
23 socket with path */var/run/dpdk/\*/dpdk_telemetry.v2* (when the primary process
24 is run by a root user).
27 Telemetry Initialization
28 ------------------------
30 The library is enabled by default, however an EAL flag to enable the library
31 exists, to provide backward compatibility for the previous telemetry library
36 A flag exists to disable Telemetry also::
44 The following steps show how to run an application with telemetry support,
45 and query information using the telemetry client python script.
47 #. Launch testpmd as the primary application with telemetry::
51 #. Launch the telemetry client script::
53 ./usertools/dpdk-telemetry.py
55 #. When connected, the script displays the following, waiting for user input::
57 Connecting to /var/run/dpdk/rte/dpdk_telemetry.v2
58 {"version": "DPDK 20.05.0-rc2", "pid": 60285, "max_output_len": 16384}
61 #. The user can now input commands to send across the socket, and receive the
62 response. Some available commands are shown below.
67 {"/": ["/", "/eal/app_params", "/eal/params", "/ethdev/list",
68 "/ethdev/link_status", "/ethdev/xstats", "/help", "/info"]}
70 * Get the list of ethdev ports::
73 {"/ethdev/list": [0, 1]}
77 For commands that expect a parameter, use "," to separate the command
78 and parameter. See examples below.
80 * Get extended statistics for an ethdev port::
83 {"/ethdev/xstats": {"rx_good_packets": 0, "tx_good_packets": 0,
84 "rx_good_bytes": 0, "tx_good_bytes": 0, "rx_missed_errors": 0,
86 "tx_priority7_xon_to_xoff_packets": 0}}
88 * Get the help text for a command. This will indicate what parameters are
89 required. Pass the command as a parameter::
91 --> /help,/ethdev/xstats
92 {"/help": {"/ethdev/xstats": "Returns the extended stats for a port.
93 Parameters: int port_id"}}