.. SPDX-License-Identifier: BSD-3-Clause
Copyright(c) 2017 Intel Corporation.
+ Copyright(c) 2018 Arm Limited.
Event Device Library
====================
application fills in to have the event scheduled as required:
* ``flow_id`` - The targeted flow identifier for the enq/deq operation.
-* ``event_type`` - The source of this event, eg RTE_EVENT_TYPE_ETHDEV or CPU.
+* ``event_type`` - The source of this event, e.g. RTE_EVENT_TYPE_ETHDEV or CPU.
* ``sub_event_type`` - Distinguishes events inside the application, that have
the same event_type (see above)
* ``op`` - This field takes one of the RTE_EVENT_OP_* values, and tells the
This section will introduce the reader to the eventdev API, showing how to
create and configure an eventdev and use it for a two-stage atomic pipeline
-with a single core for TX. The diagram below shows the final state of the
-application after this walk-through:
+with one core each for RX and TX. RX and TX cores are shown here for
+illustration, refer to Eventdev Adapter documentation for further details.
+The diagram below shows the final state of the application after this
+walk-through:
.. _figure_eventdev-usage1:
.nb_atomic_flows = 1024,
.nb_atomic_order_sequences = 1024,
};
+ struct rte_event_queue_conf single_link_conf = {
+ .event_queue_cfg = RTE_EVENT_QUEUE_CFG_SINGLE_LINK,
+ };
int dev_id = 0;
- int queue_id = 0;
- int err = rte_event_queue_setup(dev_id, queue_id, &atomic_conf);
+ int atomic_q_1 = 0;
+ int atomic_q_2 = 1;
+ int single_link_q = 2;
+ int err = rte_event_queue_setup(dev_id, atomic_q_1, &atomic_conf);
+ int err = rte_event_queue_setup(dev_id, atomic_q_2, &atomic_conf);
+ int err = rte_event_queue_setup(dev_id, single_link_q, &single_link_conf);
-The remainder of this walk-through assumes that the queues are configured as
-follows:
+As shown above, queue IDs are as follows:
* id 0, atomic queue #1
* id 1, atomic queue #2
* id 2, single-link queue
+These queues are used for the remainder of this walk-through.
+
Setting up Ports
~~~~~~~~~~~~~~~~
-Once queues are set up successfully, create the ports as required. Each port
-should be set up with its corresponding port_conf type, worker for worker cores,
-rx and tx for the RX and TX cores:
+Once queues are set up successfully, create the ports as required.
.. code-block:: c
.new_event_threshold = 4096,
};
int dev_id = 0;
- int port_id = 0;
- int err = rte_event_port_setup(dev_id, port_id, &CORE_FUNCTION_conf);
+ int rx_port_id = 0;
+ int worker_port_id;
+ int err = rte_event_port_setup(dev_id, rx_port_id, &rx_conf);
+
+ for (worker_port_id = 1; worker_port_id <= 4; worker_port_id++) {
+ int err = rte_event_port_setup(dev_id, worker_port_id, &worker_conf);
+ }
+
+ int tx_port_id = 5;
+ int err = rte_event_port_setup(dev_id, tx_port_id, &tx_conf);
-It is now assumed that:
+As shown above:
* port 0: RX core
* ports 1,2,3,4: Workers
* port 5: TX core
+These ports are used for the remainder of this walk-through.
+
Linking Queues and Ports
~~~~~~~~~~~~~~~~~~~~~~~~
The final step is to "wire up" the ports to the queues. After this, the
eventdev is capable of scheduling events, and when cores request work to do,
the correct events are provided to that core. Note that the RX core takes input
-from eg: a NIC so it is not linked to any eventdev queues.
+from e.g.: a NIC so it is not linked to any eventdev queues.
Linking all workers to atomic queues, and the TX core to the single-link queue
can be achieved like this:
.. code-block:: c
- uint8_t port_id = 0;
+ uint8_t rx_port_id = 0;
+ uint8_t tx_port_id = 5;
uint8_t atomic_qs[] = {0, 1};
uint8_t single_link_q = 2;
- uint8_t tx_port_id = 5;
- uin8t_t priority = RTE_EVENT_DEV_PRIORITY_NORMAL;
+ uint8_t priority = RTE_EVENT_DEV_PRIORITY_NORMAL;
+ int worker_port_id;
- for(int i = 0; i < 4; i++) {
- int worker_port = i + 1;
- int links_made = rte_event_port_link(dev_id, worker_port, atomic_qs, NULL, 2);
+ for (worker_port_id = 1; worker_port_id <= 4; worker_port_id++) {
+ int links_made = rte_event_port_link(dev_id, worker_port_id, atomic_qs, NULL, 2);
}
int links_made = rte_event_port_link(dev_id, tx_port_id, &single_link_q, &priority, 1);
int err = rte_event_dev_start(dev_id);
+.. Note::
+
+ EventDev needs to be started before starting the event producers such
+ as event_eth_rx_adapter, event_timer_adapter and event_crypto_adapter.
+
Ingress of New Events
~~~~~~~~~~~~~~~~~~~~~
ev[i].flow_id = mbufs[i]->hash.rss;
ev[i].op = RTE_EVENT_OP_NEW;
ev[i].sched_type = RTE_SCHED_TYPE_ATOMIC;
- ev[i].queue_id = 0;
+ ev[i].queue_id = atomic_q_1;
ev[i].event_type = RTE_EVENT_TYPE_ETHDEV;
ev[i].sub_event_type = 0;
ev[i].priority = RTE_EVENT_DEV_PRIORITY_NORMAL;
ev[i].mbuf = mbufs[i];
}
- const int nb_tx = rte_event_enqueue_burst(dev_id, port_id, ev, nb_rx);
+ const int nb_tx = rte_event_enqueue_burst(dev_id, rx_port_id, ev, nb_rx);
if (nb_tx != nb_rx) {
for(i = nb_tx; i < nb_rx; i++)
rte_pktmbuf_free(mbufs[i]);
events[i].queue_id++;
}
- uint16_t nb_tx = rte_event_enqueue_burst(dev_id, port_id, events, nb_rx);
+ uint16_t nb_tx = rte_event_enqueue_burst(dev_id, worker_port_id, events, nb_rx);
Egress of Events
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