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GET /api/patches/23801/?format=api
{ "id": 23801, "url": "https://patches.dpdk.org/api/patches/23801/?format=api", "web_url": "https://patches.dpdk.org/project/dpdk/patch/1492768299-84016-4-git-send-email-harry.van.haaren@intel.com/", "project": { "id": 1, "url": "https://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": "<1492768299-84016-4-git-send-email-harry.van.haaren@intel.com>", "list_archive_url": "https://inbox.dpdk.org/dev/1492768299-84016-4-git-send-email-harry.van.haaren@intel.com", "date": "2017-04-21T09:51:39", "name": "[dpdk-dev,3/3] doc: add eventdev library to programmers guide", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": true, "hash": "9cbf83b44ab2a6b8910fc11b73dad4441225f9eb", "submitter": { "id": 317, "url": "https://patches.dpdk.org/api/people/317/?format=api", "name": "Van Haaren, Harry", "email": "harry.van.haaren@intel.com" }, "delegate": { "id": 310, "url": "https://patches.dpdk.org/api/users/310/?format=api", "username": "jerin", "first_name": "Jerin", "last_name": "Jacob", "email": "jerinj@marvell.com" }, "mbox": "https://patches.dpdk.org/project/dpdk/patch/1492768299-84016-4-git-send-email-harry.van.haaren@intel.com/mbox/", "series": [], "comments": "https://patches.dpdk.org/api/patches/23801/comments/", "check": "success", "checks": "https://patches.dpdk.org/api/patches/23801/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 F1D7858F6;\n\tFri, 21 Apr 2017 11:52:37 +0200 (CEST)", "from mga01.intel.com (mga01.intel.com [192.55.52.88])\n\tby dpdk.org (Postfix) with ESMTP id EDACC58D1\n\tfor <dev@dpdk.org>; Fri, 21 Apr 2017 11:52:35 +0200 (CEST)", "from orsmga005.jf.intel.com ([10.7.209.41])\n\tby fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384;\n\t21 Apr 2017 02:52:34 -0700", "from silpixa00398672.ir.intel.com ([10.237.223.128])\n\tby orsmga005.jf.intel.com with ESMTP; 21 Apr 2017 02:52:33 -0700" ], "X-ExtLoop1": "1", "X-IronPort-AV": "E=Sophos;i=\"5.37,229,1488873600\"; d=\"scan'208\";a=\"90572738\"", "From": "Harry van Haaren <harry.van.haaren@intel.com>", "To": "dev@dpdk.org", "Cc": "jerin.jacob@caviumnetworks.com,\n\tHarry van Haaren <harry.van.haaren@intel.com>", "Date": "Fri, 21 Apr 2017 10:51:39 +0100", "Message-Id": "<1492768299-84016-4-git-send-email-harry.van.haaren@intel.com>", "X-Mailer": "git-send-email 2.7.4", "In-Reply-To": "<1492768299-84016-1-git-send-email-harry.van.haaren@intel.com>", "References": "<1492768299-84016-1-git-send-email-harry.van.haaren@intel.com>", "Subject": "[dpdk-dev] [PATCH 3/3] doc: add eventdev library to programmers\n\tguide", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.15", "Precedence": "list", "List-Id": "DPDK patches and discussions <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": "This commit adds an entry in the programmers guide\nexplaining the eventdev library.\n\nThe rte_event struct, queues and ports are explained.\nAn API walktrough of a simple two stage atomic pipeline\nprovides the reader with a step by step overview of the\nexpected usage of the Eventdev API.\n\nSigned-off-by: Harry van Haaren <harry.van.haaren@intel.com>\n---\n doc/guides/prog_guide/eventdev.rst | 365 ++++++++++\n doc/guides/prog_guide/img/eventdev_usage.svg | 994 +++++++++++++++++++++++++++\n doc/guides/prog_guide/index.rst | 1 +\n 3 files changed, 1360 insertions(+)\n create mode 100644 doc/guides/prog_guide/eventdev.rst\n create mode 100644 doc/guides/prog_guide/img/eventdev_usage.svg", "diff": "diff --git a/doc/guides/prog_guide/eventdev.rst b/doc/guides/prog_guide/eventdev.rst\nnew file mode 100644\nindex 0000000..4f6088e\n--- /dev/null\n+++ b/doc/guides/prog_guide/eventdev.rst\n@@ -0,0 +1,365 @@\n+.. BSD LICENSE\n+ Copyright(c) 2017 Intel Corporation. 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+Event Device Library\n+====================\n+\n+The DPDK Event device library is an abstraction that provides the application\n+with features to schedule events. This is achieved using the PMD architecture\n+similar to the ethdev or cryptodev APIs, which may already be familiar to the\n+reader. The eventdev framework is provided as a DPDK library, allowing\n+applications to use it if they wish, but not require its usage.\n+\n+The goal of this library is to enable applications to build processing\n+pipelines where the load balancing and scheduling is handled by the eventdev.\n+Step-by-step instructions of the eventdev design is available in the `API\n+Walktrough`_ section later in this document.\n+\n+Event struct\n+------------\n+\n+The eventdev API represents each event with a generic struct, which contains a\n+payload and metadata required for scheduling by an eventdev. The\n+``rte_event`` struct is a 16 byte C structure, defined in\n+``libs/librte_eventdev/rte_eventdev.h``.\n+\n+Event Metadata\n+~~~~~~~~~~~~~~\n+\n+The rte_event structure contains the following metadata fields, which the\n+application fills in to have the event scheduled as required:\n+\n+* ``flow_id`` - The targeted flow identifier for the enq/deq operation.\n+* ``event_type`` - The source of this event, eg RTE_EVENT_TYPE_ETHDEV or CPU.\n+* ``sub_event_type`` - Distinguishes events inside the application, that have\n+ the same event_type (see above)\n+* ``op`` - This field takes one of the RTE_EVENT_OP_* values, and tells the\n+ eventdev about the status of the event - valid values are NEW, FORWARD or\n+ RELEASE.\n+* ``sched_type`` - Represents the type of scheduling that should be performed\n+ on this event, valid values are the RTE_SCHED_TYPE_ORDERED, ATOMIC and\n+ PARALLEL.\n+* ``queue_id`` - The identifier for the event queue that the event is sent to.\n+* ``priority`` - The priority of this event, see RTE_EVENT_DEV_PRIORITY.\n+\n+Event Payload\n+~~~~~~~~~~~~~\n+\n+The rte_event struct contains a union for payload, allowing flexibility in what\n+the actual event being scheduled is. The payload is a union of the following:\n+\n+* ``uint64_t u64``\n+* ``void *event_ptr``\n+* ``struct rte_mbuf *mbuf``\n+\n+These three items in a union occupy the same 64 bits at the end of the rte_event\n+structure. The application can utilize the 64 bits directly by accessing the\n+u64 variable, while the event_ptr and mbuf are provided as convenience\n+variables. For example the mbuf pointer in the union can used to schedule a\n+DPDK packet.\n+\n+Queues\n+~~~~~~\n+\n+A queue is a logical \"stage\" of a packet processing graph, where each stage\n+has a specified scheduling type. The application configures each queue for a\n+specific type of scheduling, and just enqueues all events to the eventdev.\n+The Eventdev API supports the following scheduling types per queue:\n+\n+* Atomic\n+* Ordered\n+* Parallel\n+\n+Atomic, Ordered and Parallel are load-balanced scheduling types: the output\n+of the queue can be spread out over multiple CPU cores.\n+\n+Atomic scheduling on a queue ensures that a single flow is not present on two\n+different CPU cores at the same time. Ordered allows sending all flows to any\n+core, but the scheduler must ensure that on egress the packets are returned to\n+ingress order. Parallel allows sending all flows to all CPU cores, without any\n+re-ordering guarantees.\n+\n+Single Link Flag\n+^^^^^^^^^^^^^^^^\n+\n+There is a SINGLE_LINK flag which allows an application to indicate that only\n+one port will be connected to a queue. Queues configured with the single-link\n+flag follow a FIFO like structure, maintaining ordering but it is only capable\n+of being linked to a single port (see below for port and queue linking details).\n+\n+\n+Ports\n+~~~~~\n+\n+Ports are the points of contact between worker cores and the eventdev. The\n+general use-case will see one CPU core using one port to enqueue and dequeue\n+events from an eventdev. Ports are linked to queues in order to retrieve events\n+from those queues (more details in `Linking Queues and Ports`_ below).\n+\n+\n+API Walktrough\n+--------------\n+\n+This section will introduce the reader to the eventdev API, showing how to\n+create and configure an eventdev and use it for a two-stage atomic pipeline\n+with a single core for TX. The diagram below shows the final state of the\n+application after this walktrough:\n+\n+.. _figure_eventdev-usage1:\n+\n+.. figure:: img/eventdev_usage.*\n+\n+ Sample eventdev usage, with RX, two atomic stages and a single-link to TX.\n+\n+\n+A high level overview of the setup steps are:\n+\n+* rte_event_dev_configure()\n+* rte_event_queue_setup()\n+* rte_event_port_setup()\n+* rte_event_port_link()\n+* rte_event_dev_start()\n+\n+\n+Init and Config\n+~~~~~~~~~~~~~~~\n+\n+The eventdev library uses vdev options to add devices to the DPDK application.\n+The ``--vdev`` EAL option allows adding eventdev instances to your DPDK\n+application, using the name of the eventdev PMD as an argument.\n+\n+For example, to create an instance of the software eventdev scheduler, the\n+following vdev arguments should be provided to the application EAL command line:\n+\n+.. code-block:: console\n+\n+ ./dpdk_application --vdev=\"event_sw0\"\n+\n+In the following code, we configure eventdev instance with 3 queues\n+and 6 ports as follows. The 3 queues consist of 2 Atomic and 1 Single-Link,\n+while the 6 ports consist of 4 workers, 1 RX and 1 TX.\n+\n+.. code-block:: c\n+\n+ const struct rte_event_dev_config config = {\n+ .nb_event_queues = 3,\n+ .nb_event_ports = 6,\n+ .nb_events_limit = 4096,\n+ .nb_event_queue_flows = 1024,\n+ .nb_event_port_dequeue_depth = 128,\n+ .nb_event_port_enqueue_depth = 128,\n+ };\n+ int err = rte_event_dev_configure(dev_id, &config);\n+\n+The remainder of this walktrough assumes that dev_id is 0.\n+\n+Setting up Queues\n+~~~~~~~~~~~~~~~~~\n+\n+Once the eventdev itself is configured, the next step is to configure queues.\n+This is done by setting the appropriate values in a queue_conf structure, and\n+calling the setup function. Repeat this step for each queue, starting from\n+0 and ending at ``nb_event_queues - 1`` from the event_dev config above.\n+\n+.. code-block:: c\n+\n+ struct rte_event_queue_conf atomic_conf = {\n+ .event_queue_cfg = RTE_EVENT_QUEUE_CFG_ATOMIC_ONLY,\n+ .priority = RTE_EVENT_DEV_PRIORITY_NORMAL,\n+ .nb_atomic_flows = 1024,\n+ .nb_atomic_order_sequences = 1024,\n+ };\n+ int dev_id = 0;\n+ int queue_id = 0;\n+ int err = rte_event_queue_setup(dev_id, queue_id, &atomic_conf);\n+\n+The remainder of this walktrough assumes that the queues are configured as\n+follows:\n+\n+ * id 0, atomic queue #1\n+ * id 1, atomic queue #2\n+ * id 2, single-link queue\n+\n+Setting up Ports\n+~~~~~~~~~~~~~~~~\n+\n+Once queues are set up successfully, create the ports as required. Each port\n+should be set up with its corresponding port_conf type, worker for worker cores,\n+rx and tx for the RX and TX cores:\n+\n+.. code-block:: c\n+\n+ struct rte_event_port_conf rx_conf = {\n+ .dequeue_depth = 128,\n+ .enqueue_depth = 128,\n+ .new_event_threshold = 1024,\n+ };\n+ struct rte_event_port_conf worker_conf = {\n+ .dequeue_depth = 16,\n+ .enqueue_depth = 64,\n+ .new_event_threshold = 4096,\n+ };\n+ struct rte_event_port_conf tx_conf = {\n+ .dequeue_depth = 128,\n+ .enqueue_depth = 128,\n+ .new_event_threshold = 4096,\n+ };\n+ int dev_id = 0;\n+ int port_id = 0;\n+ int err = rte_event_port_setup(dev_id, port_id, &CORE_FUNCTION_conf);\n+\n+It is now assumed that:\n+\n+ * port 0: RX core\n+ * ports 1,2,3,4: Workers\n+ * port 5: TX core\n+\n+Linking Queues and Ports\n+~~~~~~~~~~~~~~~~~~~~~~~~\n+\n+The final step is to \"wire up\" the ports to the queues. After this, the\n+eventdev is capable of scheduling events, and when cores request work to do,\n+the correct events are provided to that core. Note that the RX core takes input\n+from eg: a NIC so it is not linked to any eventdev queues.\n+\n+Linking all workers to atomic queues, and the TX core to the single-link queue\n+can be achieved like this:\n+\n+.. code-block:: c\n+\n+ uint8_t port_id = 0;\n+ uint8_t atomic_qs[] = {0, 1};\n+ uint8_t single_link_q = 2;\n+ uint8_t tx_port_id = 5;\n+ uin8t_t priority = RTE_EVENT_DEV_PRIORITY_NORMAL;\n+\n+ for(int i = 0; i < 4; i++) {\n+ int worker_port = i + 1;\n+ int links_made = rte_event_port_link(dev_id, worker_port, atomic_qs, NULL, 2);\n+ }\n+ int links_made = rte_event_port_link(dev_id, tx_port_id, &single_link_q, &priority, 1);\n+\n+Starting the EventDev\n+~~~~~~~~~~~~~~~~~~~~~\n+\n+A single function call tells the eventdev instance to start processing\n+events. Note that all queues must be linked to for the instance to start, as\n+if any queue is not linked to, enqueuing to that queue will cause the\n+application to backpressure and eventually stall due to no space in the\n+eventdev.\n+\n+.. code-block:: c\n+\n+ int err = rte_event_dev_start(dev_id);\n+\n+Ingress of New Events\n+~~~~~~~~~~~~~~~~~~~~~\n+\n+Now that the eventdev is set up, and ready to receive events, the RX core must\n+enqueue some events into the system for it to schedule. The events to be\n+scheduled are ordinary DPDK packets, received from an eth_rx_burst() as normal.\n+The following code shows how those packets can be enqueued into the eventdev:\n+\n+.. code-block:: c\n+\n+ const uint16_t nb_rx = rte_eth_rx_burst(eth_port, 0, mbufs, BATCH_SIZE);\n+\n+ for (i = 0; i < nb_rx; i++) {\n+ ev[i].flow_id = mbufs[i]->hash.rss;\n+ ev[i].op = RTE_EVENT_OP_NEW;\n+ ev[i].sched_type = RTE_EVENT_QUEUE_CFG_ATOMIC_ONLY;\n+ ev[i].queue_id = 0;\n+ ev[i].event_type = RTE_EVENT_TYPE_CPU;\n+ ev[i].sub_event_type = 0;\n+ ev[i].priority = RTE_EVENT_DEV_PRIORITY_NORMAL;\n+ ev[i].mbuf = mbufs[i];\n+ }\n+\n+ const int nb_tx = rte_event_enqueue_burst(dev_id, port_id, ev, nb_rx);\n+ if (nb_tx != nb_rx) {\n+ for(i = nb_tx; i < nb_rx; i++)\n+ rte_pktmbuf_free(mbufs[i]);\n+ }\n+\n+Forwarding of Events\n+~~~~~~~~~~~~~~~~~~~~\n+\n+Now that the RX core has injected events, there is work to be done by the\n+workers. Note that each worker will dequeue as many events as it can in a burst,\n+process each one individually, and then burst the packets back into the\n+eventdev.\n+\n+The worker can lookup the events source from ``event.queue_id``, which should\n+indicate to the worker what workload needs to be performed on the event.\n+Once done, the worker can update the ``event.queue_id`` to a new value, to send\n+the event to the next stage in the pipeline.\n+\n+.. code-block:: c\n+\n+ int timeout = 0;\n+ struct rte_event events[BATCH_SIZE];\n+ uint16_t nb_rx = rte_event_dequeue_burst(dev_id, worker_port_id, events, BATCH_SIZE, timeout);\n+\n+ for (i = 0; i < nb_rx; i++) {\n+ /* process mbuf using events[i].queue_id as pipeline stage */\n+ struct rte_mbuf *mbuf = events[i].mbuf;\n+ /* Send event to next stage in pipeline */\n+ events[i].queue_id++;\n+ }\n+\n+ uint16_t nb_tx = rte_event_enqueue_burst(dev_id, port_id, events, nb_rx);\n+\n+\n+Egress of Events\n+~~~~~~~~~~~~~~~~\n+\n+Finally, when the packet is ready for egress or needs to be dropped, we need\n+to inform the eventdev that the packet is no longer being handled by the\n+application. This can be done by calling dequeue() or dequeue_burst(), which\n+indicates that the previous burst of packets is no longer in use by the\n+application.\n+\n+.. code-block:: c\n+\n+ struct rte_event events[BATCH_SIZE];\n+ uint16_t n = rte_event_dequeue_burst(dev_id, port_id, events, BATCH_SIZE, 0);\n+ /* burst #1 : now tx or use the packets */\n+ n = rte_event_dequeue_burst(dev_id, port_id, events, BATCH_SIZE, 0);\n+ /* burst #1 is now no longer valid to use in the application, as\n+ the eventdev has dropped any locks or released re-ordered packets */\n+\n+Summary\n+-------\n+\n+The eventdev library allows an application to easily schedule events as it\n+requires, either using a run-to-completion or pipeline processing model. The\n+queues and ports abstract the logical functionality of an eventdev, providing\n+the application with a generic method to schedule events. With the flexible\n+PMD infrastructure applications benefit of improvements in existing eventdevs\n+and additions of new ones without modification.\ndiff --git a/doc/guides/prog_guide/img/eventdev_usage.svg b/doc/guides/prog_guide/img/eventdev_usage.svg\nnew file mode 100644\nindex 0000000..7765649\n--- /dev/null\n+++ b/doc/guides/prog_guide/img/eventdev_usage.svg\n@@ -0,0 +1,994 @@\n+<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n+\n+<svg\n+ xmlns:v=\"http://schemas.microsoft.com/visio/2003/SVGExtensions/\"\n+ xmlns:dc=\"http://purl.org/dc/elements/1.1/\"\n+ xmlns:cc=\"http://creativecommons.org/ns#\"\n+ xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"\n+ xmlns:svg=\"http://www.w3.org/2000/svg\"\n+ xmlns=\"http://www.w3.org/2000/svg\"\n+ xmlns:xlink=\"http://www.w3.org/1999/xlink\"\n+ xmlns:sodipodi=\"http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd\"\n+ xmlns:inkscape=\"http://www.inkscape.org/namespaces/inkscape\"\n+ width=\"683.12061\"\n+ 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id=\"title178-7\">Dynamic connector.28</title><path\n+ d=\"m 0,603 50.38,0\"\n+ class=\"st7\"\n+ id=\"path180-6\"\n+ inkscape:connector-curvature=\"0\"\n+ style=\"stroke:#5b9bd5;stroke-width:1;stroke-linecap:round;stroke-linejoin:round;marker-end:url(#mrkr4-33)\" /></g></g>\n+</svg>\ndiff --git a/doc/guides/prog_guide/index.rst b/doc/guides/prog_guide/index.rst\nindex ef5a02a..7578395 100644\n--- a/doc/guides/prog_guide/index.rst\n+++ b/doc/guides/prog_guide/index.rst\n@@ -57,6 +57,7 @@ Programmer's Guide\n multi_proc_support\n kernel_nic_interface\n thread_safety_dpdk_functions\n+ eventdev\n qos_framework\n power_man\n packet_classif_access_ctrl\n", "prefixes": [ "dpdk-dev", "3/3" ] }