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GET /api/patches/8344/?format=api
{ "id": 8344, "url": "http://patches.dpdk.org/api/patches/8344/?format=api", "web_url": "http://patches.dpdk.org/project/dpdk/patch/1446198204-9852-7-git-send-email-danielx.t.mrzyglod@intel.com/", "project": { "id": 1, "url": "http://patches.dpdk.org/api/projects/1/?format=api", "name": "DPDK", "link_name": "dpdk", "list_id": "dev.dpdk.org", "list_email": "dev@dpdk.org", "web_url": "http://core.dpdk.org", "scm_url": "git://dpdk.org/dpdk", "webscm_url": "http://git.dpdk.org/dpdk", "list_archive_url": "https://inbox.dpdk.org/dev", "list_archive_url_format": "https://inbox.dpdk.org/dev/{}", "commit_url_format": "" }, "msgid": "<1446198204-9852-7-git-send-email-danielx.t.mrzyglod@intel.com>", "list_archive_url": "https://inbox.dpdk.org/dev/1446198204-9852-7-git-send-email-danielx.t.mrzyglod@intel.com", "date": "2015-10-30T09:43:24", "name": "[dpdk-dev,v2,6/6] doc: add a PTPCLIENT sample guide", "commit_ref": null, "pull_url": null, "state": "changes-requested", "archived": true, "hash": "b69f1ff1659ea87ae4f715f4427e09923aac0997", "submitter": { "id": 23, "url": "http://patches.dpdk.org/api/people/23/?format=api", "name": "Daniel Mrzyglod", "email": "danielx.t.mrzyglod@intel.com" }, "delegate": null, "mbox": "http://patches.dpdk.org/project/dpdk/patch/1446198204-9852-7-git-send-email-danielx.t.mrzyglod@intel.com/mbox/", "series": [], "comments": "http://patches.dpdk.org/api/patches/8344/comments/", "check": "pending", "checks": "http://patches.dpdk.org/api/patches/8344/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@dpdk.org", "Delivered-To": "patchwork@dpdk.org", "Received": [ "from [92.243.14.124] (localhost [IPv6:::1])\n\tby dpdk.org (Postfix) with ESMTP id 762418E68;\n\tFri, 30 Oct 2015 10:49:07 +0100 (CET)", "from mga03.intel.com (mga03.intel.com [134.134.136.65])\n\tby dpdk.org (Postfix) with ESMTP id 1D99F5A50\n\tfor <dev@dpdk.org>; Fri, 30 Oct 2015 10:49:04 +0100 (CET)", "from orsmga002.jf.intel.com ([10.7.209.21])\n\tby orsmga103.jf.intel.com with ESMTP; 30 Oct 2015 02:49:04 -0700", "from unknown ([10.217.248.15])\n\tby orsmga002.jf.intel.com with SMTP; 30 Oct 2015 02:49:02 -0700", "by (sSMTP sendmail emulation); Fri, 30 Oct 2015 10:48:19 +0100" ], "X-ExtLoop1": "1", "X-IronPort-AV": "E=Sophos;i=\"5.20,217,1444719600\"; d=\"scan'208\";a=\"838724161\"", "From": "Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>", "To": "dev@dpdk.org", "Date": "Fri, 30 Oct 2015 10:43:24 +0100", "Message-Id": "<1446198204-9852-7-git-send-email-danielx.t.mrzyglod@intel.com>", "X-Mailer": "git-send-email 2.1.4", "In-Reply-To": "<1446198204-9852-1-git-send-email-danielx.t.mrzyglod@intel.com>", "References": "<1443799208-9408-1-git-send-email-danielx.t.mrzyglod@intel.com>\n\t<1446198204-9852-1-git-send-email-danielx.t.mrzyglod@intel.com>", "Subject": "[dpdk-dev] [PATCH v2 6/6] doc: add a PTPCLIENT sample guide", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.15", "Precedence": "list", "List-Id": "patches and discussions about DPDK <dev.dpdk.org>", "List-Unsubscribe": "<http://dpdk.org/ml/options/dev>,\n\t<mailto:dev-request@dpdk.org?subject=unsubscribe>", "List-Archive": "<http://dpdk.org/ml/archives/dev/>", "List-Post": "<mailto:dev@dpdk.org>", "List-Help": "<mailto:dev-request@dpdk.org?subject=help>", "List-Subscribe": "<http://dpdk.org/ml/listinfo/dev>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>", "Errors-To": "dev-bounces@dpdk.org", "Sender": "\"dev\" <dev-bounces@dpdk.org>" }, "content": "It includes:\n - Add the ptpclient picture with svg format.\n - Add the ptpclient.rst file\n - Change the index.rst file for the above pictures index.\n\nSigned-off-by: Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>\n---\n doc/guides/sample_app_ug/img/ptpclient.svg | 520 +++++++++++++++++++++++++++++\n doc/guides/sample_app_ug/index.rst | 3 +\n doc/guides/sample_app_ug/ptpclient.rst | 324 ++++++++++++++++++\n 3 files changed, 847 insertions(+)\n 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-73,6 +73,7 @@ Sample Applications User Guide\n vm_power_management\n tep_termination\n proc_info\n+ ptpclient\n \n **Figures**\n \n@@ -136,6 +137,8 @@ Sample Applications User Guide\n :numref:`figure_overlay_networking` :ref:`figure_overlay_networking`\n :numref:`figure_tep_termination_arch` :ref:`figure_tep_termination_arch`\n \n+:numref:`figure_ptpclient_highlevel` :ref:`figure_ptpclient_highlevel`\n+\n **Tables**\n \n :numref:`table_qos_metering_1` :ref:`table_qos_metering_1`\ndiff --git a/doc/guides/sample_app_ug/ptpclient.rst b/doc/guides/sample_app_ug/ptpclient.rst\nnew file mode 100644\nindex 0000000..31aa505\n--- /dev/null\n+++ b/doc/guides/sample_app_ug/ptpclient.rst\n@@ -0,0 +1,324 @@\n+.. BSD LICENSE\n+ Copyright(c) 2015 Intel Corporation. All rights reserved.\n+ All rights reserved.\n+\n+ Redistribution and use in source and binary forms, with or without\n+ modification, are permitted provided that the following conditions\n+ are met:\n+\n+ * Redistributions of source code must retain the above copyright\n+ notice, this list of conditions and the following disclaimer.\n+ * Redistributions in binary form must reproduce the above copyright\n+ notice, this list of conditions and the following disclaimer in\n+ the documentation and/or other materials provided with the\n+ distribution.\n+ * Neither the name of Intel Corporation nor the names of its\n+ contributors may be used to endorse or promote products derived\n+ from this software without specific prior written permission.\n+\n+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n+ \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n+\n+\n+PTP Client Sample Application\n+=============================\n+\n+The PTP (Precision Time Protocol) client sample application is a simple\n+example of using the DPDK IEEE1588 API to communicate with a PTP master clock\n+to synchronize the time on the NIC and, optionally, on the Linux system.\n+\n+Note, PTP is a time syncing protocol and cannot be used within DPDK as a\n+time-stamping mechanism. See the following for an explanation of the protocol:\n+`Precision Time Protocol\n+<https://en.wikipedia.org/wiki/Precision_Time_Protocol>`_.\n+\n+\n+Limitations\n+-----------\n+\n+The PTP sample application is intended as a simple reference implementation of\n+a PTP client using the DPDK IEEE1588 API.\n+In order to keep the application simple the following assumptions are made:\n+\n+* The first discovered master is the master for the session.\n+* Only L2 PTP packets are supported.\n+* Only the PTP v2 protocol is supported.\n+* Only the slave clock is implemented.\n+\n+\n+How the Application Works\n+-------------------------\n+\n+.. _figure_ptpclient_highlevel:\n+\n+.. figure:: img/ptpclient.*\n+\n+ PTP Synchronization Protocol\n+\n+The PTP synchronization in the sample application works as follows:\n+\n+* Master sends *Sync* message - the slave saves it as T2.\n+* Master sends *Follow Up* message and sends time of T1.\n+* Slave sends *Delay Request* frame to PTP Master and stores T3.\n+* Master sends *Delay Response* T4 time which is time of received T3.\n+\n+The adjustment for slave can be represented as:\n+\n+ adj = -[(T2-T1)-(T4 - T3)]/2\n+\n+If the command line parameter ``-T 1`` is used the application also\n+synchronizes the PTP PHC clock with the Linux kernel clock.\n+\n+\n+Compiling the Application\n+-------------------------\n+\n+To compile the application, export the path to the DPDK source tree and edit\n+the ``config/common_linuxapp`` configuration file to enable IEEE1588:\n+\n+.. code-block:: console\n+\n+ export RTE_SDK=/path/to/rte_sdk\n+\n+ # Edit common_linuxapp and set the following options:\n+ CONFIG_RTE_LIBRTE_IEEE1588=y\n+\n+Set the target, for example:\n+\n+.. code-block:: console\n+\n+ export RTE_TARGET=x86_64-native-linuxapp-gcc\n+\n+See the *DPDK Getting Started* Guide for possible ``RTE_TARGET`` values.\n+\n+Build the application as follows:\n+\n+.. code-block:: console\n+\n+ # Recompile DPDK.\n+ make install T=$RTE_TARGET\n+\n+ # Compile the application.\n+ cd ${RTE_SDK}/examples/ptpclient\n+ make\n+\n+\n+Running the Application\n+-----------------------\n+\n+To run the example in a ``linuxapp`` environment:\n+\n+.. code-block:: console\n+\n+ ./build/ptpclient -c 2 -n 4 -- -p 0x1 -T 0\n+\n+Refer to *DPDK Getting Started Guide* for general information on running\n+applications and the Environment Abstraction Layer (EAL) options.\n+\n+* ``-p portmask``: Hexadecimal portmask.\n+* ``-T 0``: Update only the PTP slave clock.\n+* ``-T 1``: Update the PTP slave clock and synchronize the Linux Kernel to the PTP clock.\n+\n+\n+Code Explanation\n+----------------\n+\n+The following sections provide an explanation of the main components of the\n+code.\n+\n+All DPDK library functions used in the sample code are prefixed with ``rte_``\n+and are explained in detail in the *DPDK API Documentation*.\n+\n+\n+The Main Function\n+~~~~~~~~~~~~~~~~~\n+\n+The ``main()`` function performs the initialization and calls the execution\n+threads for each lcore.\n+\n+The first task is to initialize the Environment Abstraction Layer (EAL). The\n+``argc`` and ``argv`` arguments are provided to the ``rte_eal_init()``\n+function. The value returned is the number of parsed arguments:\n+\n+.. code-block:: c\n+\n+ int ret = rte_eal_init(argc, argv);\n+ if (ret < 0)\n+ rte_exit(EXIT_FAILURE, \"Error with EAL initialization\\n\");\n+\n+And than we parse application specific arguments\n+\n+.. code-block:: c\n+\n+ argc -= ret;\n+ argv += ret;\n+\n+ ret = ptp_parse_args(argc, argv);\n+ if (ret < 0)\n+ rte_exit(EXIT_FAILURE, \"Error with PTP initialization\\n\");\n+\n+The ``main()`` also allocates a mempool to hold the mbufs (Message Buffers)\n+used by the application:\n+\n+.. code-block:: c\n+\n+ mbuf_pool = rte_mempool_create(\"MBUF_POOL\",\n+ NUM_MBUFS * nb_ports,\n+ MBUF_SIZE,\n+ MBUF_CACHE_SIZE,\n+ sizeof(struct rte_pktmbuf_pool_private),\n+ rte_pktmbuf_pool_init, NULL,\n+ rte_pktmbuf_init, NULL,\n+ rte_socket_id(),\n+ 0);\n+\n+Mbufs are the packet buffer structure used by DPDK. They are explained in\n+detail in the \"Mbuf Library\" section of the *DPDK Programmer's Guide*.\n+\n+The ``main()`` function also initializes all the ports using the user defined\n+``port_init()`` function with portmask provided by user:\n+\n+.. code-block:: c\n+\n+ for (portid = 0; portid < nb_ports; portid++)\n+ if ((ptp_enabled_port_mask & (1 << portid)) != 0) {\n+\n+ if (port_init(portid, mbuf_pool) == 0) {\n+ ptp_enabled_ports[ptp_enabled_port_nb] = portid;\n+ ptp_enabled_port_nb++;\n+ } else {\n+ rte_exit(EXIT_FAILURE, \"Cannot init port %\"PRIu8 \"\\n\",\n+ portid);\n+ }\n+ }\n+\n+\n+Once the initialization is complete, the application is ready to launch a\n+function on an lcore. In this example ``lcore_main()`` is called on a single\n+lcore.\n+\n+.. code-block:: c\n+\n+\tlcore_main();\n+\n+The ``lcore_main()`` function is explained below.\n+\n+\n+The Lcores Main\n+~~~~~~~~~~~~~~~\n+\n+As we saw above the ``main()`` function calls an application function on the\n+available lcores.\n+\n+The main work of the application is done within the loop:\n+\n+.. code-block:: c\n+\n+ for (portid = 0; portid < ptp_enabled_port_nb; portid++) {\n+\n+ portid = ptp_enabled_ports[portid];\n+ nb_rx = rte_eth_rx_burst(portid, 0, &m, 1);\n+\n+ if (ptp_data.kernel_time_set == 1) {\n+ /* Update every KERNEL_UPDATE cycle */\n+ if (i % KERNEL_UPDATE == 0) {\n+ clock_gettime(CLOCK_REALTIME, &ptp_data.systime);\n+\n+ rte_eth_timesync_gettime(ptp_data.current_ptp_port,\n+ &ptp_data.timestamp);\n+\n+ nsec = (int64_t)timespec64_to_ns(&ptp_data.timestamp) -\n+ (int64_t)timespec64_to_ns(&ptp_data.systime);\n+\n+ ptp_data.new_adj = ns_to_timeval(nsec);\n+ adjtime(&ptp_data.new_adj, 0);\n+ }\n+ i++;\n+ }\n+\n+ if (likely(nb_rx == 0))\n+ continue;\n+\n+ if (m->ol_flags & PKT_RX_IEEE1588_PTP)\n+ parse_ptp_frames(portid, m);\n+\n+ rte_pktmbuf_free(m);\n+\n+ }\n+\n+Packets are received one by one on the RX ports and, if required, PTP response\n+packets are transmitted on the TX ports.\n+\n+If the offload flags in the mbuf indicate that the packet is a PTP packet then\n+the packet is parsed to determine which type:\n+\n+.. code-block:: c\n+\n+ if (m->ol_flags & PKT_RX_IEEE1588_PTP)\n+ parse_ptp_frames(portid, m);\n+\n+\n+All packets are freed explicitly using ``rte_pktmbuf_free()``.\n+\n+The forwarding loop can be interrupted and the application closed using\n+``Ctrl-C``.\n+\n+\n+PTP parsing\n+~~~~~~~~~~~\n+\n+The ``parse_ptp_frames()`` function processes PTP packets, implementing slave\n+PTP IEEE1588 L2 functionality.\n+\n+.. code-block:: c\n+\n+ void\n+ parse_ptp_frames(uint8_t portid, struct rte_mbuf *m) {\n+ struct ptp_header *ptp_hdr;\n+ struct ether_hdr *eth_hdr;\n+ uint16_t eth_type;\n+\n+ eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);\n+ eth_type = rte_be_to_cpu_16(eth_hdr->ether_type);\n+\n+ if (eth_type == PTP_PROTOCOL) {\n+ ptp_data.m = m;\n+ ptp_data.portid = portid;\n+ ptp_hdr = (struct ptp_header *)(rte_pktmbuf_mtod(m, char *)\n+ + sizeof(struct ether_hdr));\n+\n+ switch (ptp_hdr->msgtype) {\n+ case SYNC:\n+ parse_sync(&ptp_data);\n+ break;\n+ case FOLLOW_UP:\n+ parse_fup(&ptp_data);\n+ break;\n+ case DELAY_RESP:\n+ parse_drsp(&ptp_data);\n+ print_clock_info(&ptp_data);\n+ break;\n+ default:\n+ break;\n+ }\n+ }\n+ }\n+\n+There are 3 types of packets on the RX path which we must parse to create a minimal\n+implementation of the PTP slave client:\n+\n+* SYNC packet.\n+* FOLLOW UP packet\n+* DELAY RESPONSE packet.\n+\n+When we parse the *FOLLOW UP* packet we also create and send a *DELAY_REQUEST* packet.\n+Also when we parse the *DELAY RESPONSE* packet, and all conditions are met we adjust the PTP slave clock.\n", "prefixes": [ "dpdk-dev", "v2", "6/6" ] }