1534cc6ab1
EventDev i.e consumer needs to be started before starting the event producers. Update documentation of EventDev and EventDev adapters. Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com> Reviewed-by: Erik Gabriel Carrillo <erik.g.carrillo@intel.com> Reviewed-by: Abhinandan Gujjar <abhinandan.gujjar@intel.com>
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12 KiB
ReStructuredText
302 lines
12 KiB
ReStructuredText
.. SPDX-License-Identifier: BSD-3-Clause
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Copyright(c) 2018 Intel Corporation. All rights reserved.
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Event Crypto Adapter Library
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============================
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The DPDK :doc:`Eventdev library <eventdev>` provides event driven
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programming model with features to schedule events.
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The :doc:`Cryptodev library <cryptodev_lib>` provides an interface to
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the crypto poll mode drivers which supports different crypto operations.
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The Event Crypto Adapter is one of the adapter which is intended to
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bridge between the event device and the crypto device.
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The packet flow from crypto device to the event device can be accomplished
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using SW and HW based transfer mechanism.
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The Adapter queries an eventdev PMD to determine which mechanism to be used.
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The adapter uses an EAL service core function for SW based packet transfer
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and uses the eventdev PMD functions to configure HW based packet transfer
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between the crypto device and the event device. The crypto adapter uses a new
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event type called ``RTE_EVENT_TYPE_CRYPTODEV`` to indicate the event source.
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The application can choose to submit a crypto operation directly to
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crypto device or send it to the crypto adapter via eventdev based on
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RTE_EVENT_CRYPTO_ADAPTER_CAP_INTERNAL_PORT_OP_FWD capability.
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The first mode is known as the event new(RTE_EVENT_CRYPTO_ADAPTER_OP_NEW)
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mode and the second as the event forward(RTE_EVENT_CRYPTO_ADAPTER_OP_FORWARD)
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mode. The choice of mode can be specified while creating the adapter.
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In the former mode, it is an application responsibility to enable ingress
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packet ordering. In the latter mode, it is the adapter responsibility to
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enable the ingress packet ordering.
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Adapter Mode
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------------
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RTE_EVENT_CRYPTO_ADAPTER_OP_NEW mode
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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In the RTE_EVENT_CRYPTO_ADAPTER_OP_NEW mode, application submits crypto
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operations directly to crypto device. The adapter then dequeues crypto
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completions from crypto device and enqueues them as events to the event device.
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This mode does not ensure ingress ordering, if the application directly
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enqueues to the cryptodev without going through crypto/atomic stage.
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In this mode, events dequeued from the adapter will be treated as new events.
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The application needs to specify event information (response information)
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which is needed to enqueue an event after the crypto operation is completed.
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.. _figure_event_crypto_adapter_op_new:
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.. figure:: img/event_crypto_adapter_op_new.*
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Working model of ``RTE_EVENT_CRYPTO_ADAPTER_OP_NEW`` mode
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RTE_EVENT_CRYPTO_ADAPTER_OP_FORWARD mode
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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In the RTE_EVENT_CRYPTO_ADAPTER_OP_FORWARD mode, if HW supports
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RTE_EVENT_CRYPTO_ADAPTER_CAP_INTERNAL_PORT_OP_FWD capability the application
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can directly submit the crypto operations to the cryptodev.
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If not, application retrieves crypto adapter's event port using
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rte_event_crypto_adapter_event_port_get() API. Then, links its event
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queue to this port and starts enqueuing crypto operations as events
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to the eventdev. The adapter then dequeues the events and submits the
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crypto operations to the cryptodev. After the crypto completions, the
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adapter enqueues events to the event device.
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Application can use this mode, when ingress packet ordering is needed.
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In this mode, events dequeued from the adapter will be treated as
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forwarded events. The application needs to specify the cryptodev ID
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and queue pair ID (request information) needed to enqueue a crypto
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operation in addition to the event information (response information)
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needed to enqueue an event after the crypto operation has completed.
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.. _figure_event_crypto_adapter_op_forward:
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.. figure:: img/event_crypto_adapter_op_forward.*
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Working model of ``RTE_EVENT_CRYPTO_ADAPTER_OP_FORWARD`` mode
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API Overview
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------------
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This section has a brief introduction to the event crypto adapter APIs.
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The application is expected to create an adapter which is associated with
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a single eventdev, then add cryptodev and queue pair to the adapter instance.
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Create an adapter instance
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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An adapter instance is created using ``rte_event_crypto_adapter_create()``. This
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function is called with event device to be associated with the adapter and port
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configuration for the adapter to setup an event port(if the adapter needs to use
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a service function).
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Adapter can be started in ``RTE_EVENT_CRYPTO_ADAPTER_OP_NEW`` or
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``RTE_EVENT_CRYPTO_ADAPTER_OP_FORWARD`` mode.
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.. code-block:: c
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int err;
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uint8_t dev_id, id;
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struct rte_event_dev_info dev_info;
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struct rte_event_port_conf conf;
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enum rte_event_crypto_adapter_mode mode;
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err = rte_event_dev_info_get(id, &dev_info);
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conf.new_event_threshold = dev_info.max_num_events;
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conf.dequeue_depth = dev_info.max_event_port_dequeue_depth;
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conf.enqueue_depth = dev_info.max_event_port_enqueue_depth;
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mode = RTE_EVENT_CRYPTO_ADAPTER_OP_FORWARD;
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err = rte_event_crypto_adapter_create(id, dev_id, &conf, mode);
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If the application desires to have finer control of eventdev port allocation
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and setup, it can use the ``rte_event_crypto_adapter_create_ext()`` function.
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The ``rte_event_crypto_adapter_create_ext()`` function is passed as a callback
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function. The callback function is invoked if the adapter needs to use a
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service function and needs to create an event port for it. The callback is
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expected to fill the ``struct rte_event_crypto_adapter_conf`` structure
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passed to it.
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For RTE_EVENT_CRYPTO_ADAPTER_OP_FORWARD mode, the event port created by adapter
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can be retrieved using ``rte_event_crypto_adapter_event_port_get()`` API.
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Application can use this event port to link with event queue on which it
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enqueues events towards the crypto adapter.
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.. code-block:: c
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uint8_t id, evdev, crypto_ev_port_id, app_qid;
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struct rte_event ev;
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int ret;
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ret = rte_event_crypto_adapter_event_port_get(id, &crypto_ev_port_id);
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ret = rte_event_queue_setup(evdev, app_qid, NULL);
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ret = rte_event_port_link(evdev, crypto_ev_port_id, &app_qid, NULL, 1);
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// Fill in event info and update event_ptr with rte_crypto_op
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memset(&ev, 0, sizeof(ev));
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ev.queue_id = app_qid;
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.
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.
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ev.event_ptr = op;
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ret = rte_event_enqueue_burst(evdev, app_ev_port_id, ev, nb_events);
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Querying adapter capabilities
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The ``rte_event_crypto_adapter_caps_get()`` function allows
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the application to query the adapter capabilities for an eventdev and cryptodev
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combination. This API provides whether cryptodev and eventdev are connected using
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internal HW port or not.
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.. code-block:: c
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rte_event_crypto_adapter_caps_get(dev_id, cdev_id, &cap);
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Adding queue pair to the adapter instance
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Cryptodev device id and queue pair are created using cryptodev APIs.
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For more information see :doc:`here <cryptodev_lib>`.
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.. code-block:: c
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struct rte_cryptodev_config conf;
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struct rte_cryptodev_qp_conf qp_conf;
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uint8_t cdev_id = 0;
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uint16_t qp_id = 0;
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rte_cryptodev_configure(cdev_id, &conf);
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rte_cryptodev_queue_pair_setup(cdev_id, qp_id, &qp_conf);
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These cryptodev id and queue pair are added to the instance using the
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``rte_event_crypto_adapter_queue_pair_add()`` API.
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The same is removed using ``rte_event_crypto_adapter_queue_pair_del()`` API.
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If HW supports RTE_EVENT_CRYPTO_ADAPTER_CAP_INTERNAL_PORT_QP_EV_BIND
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capability, event information must be passed to the add API.
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.. code-block:: c
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uint32_t cap;
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int ret;
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ret = rte_event_crypto_adapter_caps_get(id, evdev, &cap);
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if (cap & RTE_EVENT_CRYPTO_ADAPTER_CAP_INTERNAL_PORT_QP_EV_BIND) {
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struct rte_event event;
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// Fill in event information & pass it to add API
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rte_event_crypto_adapter_queue_pair_add(id, cdev_id, qp_id, &event);
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} else
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rte_event_crypto_adapter_queue_pair_add(id, cdev_id, qp_id, NULL);
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Configure the service function
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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If the adapter uses a service function, the application is required to assign
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a service core to the service function as show below.
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.. code-block:: c
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uint32_t service_id;
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if (rte_event_crypto_adapter_service_id_get(id, &service_id) == 0)
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rte_service_map_lcore_set(service_id, CORE_ID);
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Set event request/response information
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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In the RTE_EVENT_CRYPTO_ADAPTER_OP_FORWARD mode, the application needs
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to specify the cryptodev ID and queue pair ID (request information) in
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addition to the event information (response information) needed to enqueue
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an event after the crypto operation has completed. The request and response
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information are specified in the ``struct rte_crypto_op`` private data or
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session's private data.
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In the RTE_EVENT_CRYPTO_ADAPTER_OP_NEW mode, the application is required
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to provide only the response information.
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The SW adapter or HW PMD uses ``rte_crypto_op::sess_type`` to
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decide whether request/response data is located in the crypto session/
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crypto security session or at an offset in the ``struct rte_crypto_op``.
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The ``rte_crypto_op::private_data_offset`` is used to locate the request/
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response in the ``rte_crypto_op``.
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For crypto session, ``rte_cryptodev_sym_session_set_user_data()`` API
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will be used to set request/response data. The same data will be obtained
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by ``rte_cryptodev_sym_session_get_user_data()`` API. The
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RTE_EVENT_CRYPTO_ADAPTER_CAP_SESSION_PRIVATE_DATA capability indicates
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whether HW or SW supports this feature.
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For security session, ``rte_security_session_set_private_data()`` API
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will be used to set request/response data. The same data will be obtained
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by ``rte_security_session_get_private_data()`` API.
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For session-less it is mandatory to place the request/response data with
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the ``rte_crypto_op``.
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.. code-block:: c
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union rte_event_crypto_metadata m_data;
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struct rte_event ev;
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struct rte_crypto_op *op;
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/* Allocate & fill op structure */
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op = rte_crypto_op_alloc();
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memset(&m_data, 0, sizeof(m_data));
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memset(&ev, 0, sizeof(ev));
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/* Fill event information and update event_ptr to rte_crypto_op */
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ev.event_ptr = op;
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if (op->sess_type == RTE_CRYPTO_OP_WITH_SESSION) {
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/* Copy response information */
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rte_memcpy(&m_data.response_info, &ev, sizeof(ev));
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/* Copy request information */
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m_data.request_info.cdev_id = cdev_id;
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m_data.request_info.queue_pair_id = qp_id;
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/* Call set API to store private data information */
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rte_cryptodev_sym_session_set_user_data(
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op->sym->session,
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&m_data,
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sizeof(m_data));
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} if (op->sess_type == RTE_CRYPTO_OP_SESSIONLESS) {
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uint32_t len = IV_OFFSET + MAXIMUM_IV_LENGTH +
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(sizeof(struct rte_crypto_sym_xform) * 2);
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op->private_data_offset = len;
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/* Copy response information */
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rte_memcpy(&m_data.response_info, &ev, sizeof(ev));
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/* Copy request information */
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m_data.request_info.cdev_id = cdev_id;
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m_data.request_info.queue_pair_id = qp_id;
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/* Store private data information along with rte_crypto_op */
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rte_memcpy(op + len, &m_data, sizeof(m_data));
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}
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Start the adapter instance
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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The application calls ``rte_event_crypto_adapter_start()`` to start the adapter.
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This function calls the start callbacks of the eventdev PMDs for hardware based
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eventdev-cryptodev connections and ``rte_service_run_state_set()`` to enable the
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service function if one exists.
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.. code-block:: c
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rte_event_crypto_adapter_start(id, mode);
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.. Note::
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The eventdev to which the event_crypto_adapter is connected needs to
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be started before calling rte_event_crypto_adapter_start().
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Get adapter statistics
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~~~~~~~~~~~~~~~~~~~~~~
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The ``rte_event_crypto_adapter_stats_get()`` function reports counters defined
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in struct ``rte_event_crypto_adapter_stats``. The received packet and
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enqueued event counts are a sum of the counts from the eventdev PMD callbacks
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if the callback is supported, and the counts maintained by the service function,
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if one exists.
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