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35 #ifndef _RTE_EVENTDEV_H_
36 #define _RTE_EVENTDEV_H_
41 * RTE Event Device API
43 * In a polling model, lcores poll ethdev ports and associated rx queues
44 * directly to look for packet. In an event driven model, by contrast, lcores
45 * call the scheduler that selects packets for them based on programmer
46 * specified criteria. Eventdev library adds support for event driven
47 * programming model, which offer applications automatic multicore scaling,
48 * dynamic load balancing, pipelining, packet ingress order maintenance and
49 * synchronization services to simplify application packet processing.
51 * The Event Device API is composed of two parts:
53 * - The application-oriented Event API that includes functions to setup
54 * an event device (configure it, setup its queues, ports and start it), to
55 * establish the link between queues to port and to receive events, and so on.
57 * - The driver-oriented Event API that exports a function allowing
58 * an event poll Mode Driver (PMD) to simultaneously register itself as
59 * an event device driver.
61 * Event device components:
65 * +-------+ | | flow 0 | |
66 * |Packet | | +-------------+ |
67 * |event | | +-------------+ |
68 * | | | | flow 1 | |port_link(port0, queue0)
69 * +-------+ | +-------------+ | | +--------+
70 * +-------+ | +-------------+ o-----v-----o |dequeue +------+
71 * |Crypto | | | flow n | | | event +------->|Core 0|
72 * |work | | +-------------+ o----+ | port 0 | | |
73 * |done ev| | event queue 0 | | +--------+ +------+
74 * +-------+ +-----------------+ |
76 * |Timer | +-----------------+ | +--------+
77 * |expiry | | +-------------+ | +------o |dequeue +------+
78 * |event | | | flow 0 | o-----------o event +------->|Core 1|
79 * +-------+ | +-------------+ | +----o port 1 | | |
80 * Event enqueue | +-------------+ | | +--------+ +------+
81 * o-------------> | | flow 1 | | |
82 * enqueue( | +-------------+ | |
83 * queue_id, | | | +--------+ +------+
84 * flow_id, | +-------------+ | | | |dequeue |Core 2|
85 * sched_type, | | flow n | o-----------o event +------->| |
86 * event_type, | +-------------+ | | | port 2 | +------+
87 * subev_type, | event queue 1 | | +--------+
88 * event) +-----------------+ | +--------+
89 * | | |dequeue +------+
90 * +-------+ +-----------------+ | | event +------->|Core n|
91 * |Core | | +-------------+ o-----------o port n | | |
92 * |(SW) | | | flow 0 | | | +--------+ +--+---+
93 * |event | | +-------------+ | | |
94 * +-------+ | +-------------+ | | |
95 * ^ | | flow 1 | | | |
96 * | | +-------------+ o------+ |
97 * | | +-------------+ | |
99 * | | +-------------+ | |
100 * | | event queue n | |
101 * | +-----------------+ |
103 * +-----------------------------------------------------------+
105 * Event device: A hardware or software-based event scheduler.
107 * Event: A unit of scheduling that encapsulates a packet or other datatype
108 * like SW generated event from the CPU, Crypto work completion notification,
109 * Timer expiry event notification etc as well as metadata.
110 * The metadata includes flow ID, scheduling type, event priority, event_type,
111 * sub_event_type etc.
113 * Event queue: A queue containing events that are scheduled by the event dev.
114 * An event queue contains events of different flows associated with scheduling
115 * types, such as atomic, ordered, or parallel.
117 * Event port: An application's interface into the event dev for enqueue and
118 * dequeue operations. Each event port can be linked with one or more
119 * event queues for dequeue operations.
121 * By default, all the functions of the Event Device API exported by a PMD
122 * are lock-free functions which assume to not be invoked in parallel on
123 * different logical cores to work on the same target object. For instance,
124 * the dequeue function of a PMD cannot be invoked in parallel on two logical
125 * cores to operates on same event port. Of course, this function
126 * can be invoked in parallel by different logical cores on different ports.
127 * It is the responsibility of the upper level application to enforce this rule.
129 * In all functions of the Event API, the Event device is
130 * designated by an integer >= 0 named the device identifier *dev_id*
132 * At the Event driver level, Event devices are represented by a generic
133 * data structure of type *rte_event_dev*.
135 * Event devices are dynamically registered during the PCI/SoC device probing
136 * phase performed at EAL initialization time.
137 * When an Event device is being probed, a *rte_event_dev* structure and
138 * a new device identifier are allocated for that device. Then, the
139 * event_dev_init() function supplied by the Event driver matching the probed
140 * device is invoked to properly initialize the device.
142 * The role of the device init function consists of resetting the hardware or
143 * software event driver implementations.
145 * If the device init operation is successful, the correspondence between
146 * the device identifier assigned to the new device and its associated
147 * *rte_event_dev* structure is effectively registered.
148 * Otherwise, both the *rte_event_dev* structure and the device identifier are
151 * The functions exported by the application Event API to setup a device
152 * designated by its device identifier must be invoked in the following order:
153 * - rte_event_dev_configure()
154 * - rte_event_queue_setup()
155 * - rte_event_port_setup()
156 * - rte_event_port_link()
157 * - rte_event_dev_start()
159 * Then, the application can invoke, in any order, the functions
160 * exported by the Event API to schedule events, dequeue events, enqueue events,
161 * change event queue(s) to event port [un]link establishment and so on.
163 * Application may use rte_event_[queue/port]_default_conf_get() to get the
164 * default configuration to set up an event queue or event port by
165 * overriding few default values.
167 * If the application wants to change the configuration (i.e. call
168 * rte_event_dev_configure(), rte_event_queue_setup(), or
169 * rte_event_port_setup()), it must call rte_event_dev_stop() first to stop the
170 * device and then do the reconfiguration before calling rte_event_dev_start()
171 * again. The schedule, enqueue and dequeue functions should not be invoked
172 * when the device is stopped.
174 * Finally, an application can close an Event device by invoking the
175 * rte_event_dev_close() function.
177 * Each function of the application Event API invokes a specific function
178 * of the PMD that controls the target device designated by its device
181 * For this purpose, all device-specific functions of an Event driver are
182 * supplied through a set of pointers contained in a generic structure of type
184 * The address of the *event_dev_ops* structure is stored in the *rte_event_dev*
185 * structure by the device init function of the Event driver, which is
186 * invoked during the PCI/SoC device probing phase, as explained earlier.
188 * In other words, each function of the Event API simply retrieves the
189 * *rte_event_dev* structure associated with the device identifier and
190 * performs an indirect invocation of the corresponding driver function
191 * supplied in the *event_dev_ops* structure of the *rte_event_dev* structure.
193 * For performance reasons, the address of the fast-path functions of the
194 * Event driver is not contained in the *event_dev_ops* structure.
195 * Instead, they are directly stored at the beginning of the *rte_event_dev*
196 * structure to avoid an extra indirect memory access during their invocation.
198 * RTE event device drivers do not use interrupts for enqueue or dequeue
199 * operation. Instead, Event drivers export Poll-Mode enqueue and dequeue
200 * functions to applications.
202 * The events are injected to event device through *enqueue* operation by
203 * event producers in the system. The typical event producers are ethdev
204 * subsystem for generating packet events, CPU(SW) for generating events based
205 * on different stages of application processing, cryptodev for generating
206 * crypto work completion notification etc
208 * The *dequeue* operation gets one or more events from the event ports.
209 * The application process the events and send to downstream event queue through
210 * rte_event_enqueue_burst() if it is an intermediate stage of event processing,
211 * on the final stage, the application may send to different subsystem like
212 * ethdev to send the packet/event on the wire using ethdev
213 * rte_eth_tx_burst() API.
215 * The point at which events are scheduled to ports depends on the device.
216 * For hardware devices, scheduling occurs asynchronously without any software
217 * intervention. Software schedulers can either be distributed
218 * (each worker thread schedules events to its own port) or centralized
219 * (a dedicated thread schedules to all ports). Distributed software schedulers
220 * perform the scheduling in rte_event_dequeue_burst(), whereas centralized
221 * scheduler logic is located in rte_event_schedule().
222 * The RTE_EVENT_DEV_CAP_DISTRIBUTED_SCHED capability flag is not set
223 * indicates the device is centralized and thus needs a dedicated scheduling
224 * thread that repeatedly calls rte_event_schedule().
226 * An event driven worker thread has following typical workflow on fastpath:
229 * rte_event_dequeue_burst(...);
231 * rte_event_enqueue_burst(...);
241 #include <rte_common.h>
242 #include <rte_memory.h>
243 #include <rte_errno.h>
245 struct rte_mbuf; /* we just use mbuf pointers; no need to include rte_mbuf.h */
247 /* Event device capability bitmap flags */
248 #define RTE_EVENT_DEV_CAP_QUEUE_QOS (1ULL << 0)
249 /**< Event scheduling prioritization is based on the priority associated with
252 * @see rte_event_queue_setup()
254 #define RTE_EVENT_DEV_CAP_EVENT_QOS (1ULL << 1)
255 /**< Event scheduling prioritization is based on the priority associated with
256 * each event. Priority of each event is supplied in *rte_event* structure
257 * on each enqueue operation.
259 * @see rte_event_enqueue_burst()
261 #define RTE_EVENT_DEV_CAP_DISTRIBUTED_SCHED (1ULL << 2)
262 /**< Event device operates in distributed scheduling mode.
263 * In distributed scheduling mode, event scheduling happens in HW or
264 * rte_event_dequeue_burst() or the combination of these two.
265 * If the flag is not set then eventdev is centralized and thus needs a
266 * dedicated scheduling thread that repeatedly calls rte_event_schedule().
268 * @see rte_event_schedule(), rte_event_dequeue_burst()
270 #define RTE_EVENT_DEV_CAP_QUEUE_ALL_TYPES (1ULL << 3)
271 /**< Event device is capable of enqueuing events of any type to any queue.
272 * If this capability is not set, the queue only supports events of the
273 * *RTE_SCHED_TYPE_* type that it was created with.
275 * @see RTE_SCHED_TYPE_* values
277 #define RTE_EVENT_DEV_CAP_BURST_MODE (1ULL << 4)
278 /**< Event device is capable of operating in burst mode for enqueue(forward,
279 * release) and dequeue operation. If this capability is not set, application
280 * still uses the rte_event_dequeue_burst() and rte_event_enqueue_burst() but
281 * PMD accepts only one event at a time.
283 * @see rte_event_dequeue_burst() rte_event_enqueue_burst()
286 /* Event device priority levels */
287 #define RTE_EVENT_DEV_PRIORITY_HIGHEST 0
288 /**< Highest priority expressed across eventdev subsystem
289 * @see rte_event_queue_setup(), rte_event_enqueue_burst()
290 * @see rte_event_port_link()
292 #define RTE_EVENT_DEV_PRIORITY_NORMAL 128
293 /**< Normal priority expressed across eventdev subsystem
294 * @see rte_event_queue_setup(), rte_event_enqueue_burst()
295 * @see rte_event_port_link()
297 #define RTE_EVENT_DEV_PRIORITY_LOWEST 255
298 /**< Lowest priority expressed across eventdev subsystem
299 * @see rte_event_queue_setup(), rte_event_enqueue_burst()
300 * @see rte_event_port_link()
304 * Get the total number of event devices that have been successfully
308 * The total number of usable event devices.
311 rte_event_dev_count(void);
314 * Get the device identifier for the named event device.
317 * Event device name to select the event device identifier.
320 * Returns event device identifier on success.
321 * - <0: Failure to find named event device.
324 rte_event_dev_get_dev_id(const char *name);
327 * Return the NUMA socket to which a device is connected.
330 * The identifier of the device.
332 * The NUMA socket id to which the device is connected or
333 * a default of zero if the socket could not be determined.
334 * -(-EINVAL) dev_id value is out of range.
337 rte_event_dev_socket_id(uint8_t dev_id);
340 * Event device information
342 struct rte_event_dev_info {
343 const char *driver_name; /**< Event driver name */
344 struct rte_device *dev; /**< Device information */
345 uint32_t min_dequeue_timeout_ns;
346 /**< Minimum supported global dequeue timeout(ns) by this device */
347 uint32_t max_dequeue_timeout_ns;
348 /**< Maximum supported global dequeue timeout(ns) by this device */
349 uint32_t dequeue_timeout_ns;
350 /**< Configured global dequeue timeout(ns) for this device */
351 uint8_t max_event_queues;
352 /**< Maximum event_queues supported by this device */
353 uint32_t max_event_queue_flows;
354 /**< Maximum supported flows in an event queue by this device*/
355 uint8_t max_event_queue_priority_levels;
356 /**< Maximum number of event queue priority levels by this device.
357 * Valid when the device has RTE_EVENT_DEV_CAP_QUEUE_QOS capability
359 uint8_t max_event_priority_levels;
360 /**< Maximum number of event priority levels by this device.
361 * Valid when the device has RTE_EVENT_DEV_CAP_EVENT_QOS capability
363 uint8_t max_event_ports;
364 /**< Maximum number of event ports supported by this device */
365 uint8_t max_event_port_dequeue_depth;
366 /**< Maximum number of events can be dequeued at a time from an
367 * event port by this device.
368 * A device that does not support bulk dequeue will set this as 1.
370 uint32_t max_event_port_enqueue_depth;
371 /**< Maximum number of events can be enqueued at a time from an
372 * event port by this device.
373 * A device that does not support bulk enqueue will set this as 1.
375 int32_t max_num_events;
376 /**< A *closed system* event dev has a limit on the number of events it
377 * can manage at a time. An *open system* event dev does not have a
378 * limit and will specify this as -1.
380 uint32_t event_dev_cap;
381 /**< Event device capabilities(RTE_EVENT_DEV_CAP_)*/
385 * Retrieve the contextual information of an event device.
388 * The identifier of the device.
390 * @param[out] dev_info
391 * A pointer to a structure of type *rte_event_dev_info* to be filled with the
392 * contextual information of the device.
395 * - 0: Success, driver updates the contextual information of the event device
396 * - <0: Error code returned by the driver info get function.
400 rte_event_dev_info_get(uint8_t dev_id, struct rte_event_dev_info *dev_info);
403 * The count of ports.
405 #define RTE_EVENT_DEV_ATTR_PORT_COUNT 0
407 * The count of queues.
409 #define RTE_EVENT_DEV_ATTR_QUEUE_COUNT 1
411 * The status of the device, zero for stopped, non-zero for started.
413 #define RTE_EVENT_DEV_ATTR_STARTED 2
416 * Get an attribute from a device.
418 * @param dev_id Eventdev id
419 * @param attr_id The attribute ID to retrieve
420 * @param[out] attr_value A pointer that will be filled in with the attribute
421 * value if successful.
423 * @retval 0 Successfully retrieved attribute value
424 * -EINVAL Invalid device or *attr_id* provided, or *attr_value*
428 rte_event_dev_attr_get(uint8_t dev_id, uint32_t attr_id,
429 uint32_t *attr_value);
432 /* Event device configuration bitmap flags */
433 #define RTE_EVENT_DEV_CFG_PER_DEQUEUE_TIMEOUT (1ULL << 0)
434 /**< Override the global *dequeue_timeout_ns* and use per dequeue timeout in ns.
435 * @see rte_event_dequeue_timeout_ticks(), rte_event_dequeue_burst()
438 /** Event device configuration structure */
439 struct rte_event_dev_config {
440 uint32_t dequeue_timeout_ns;
441 /**< rte_event_dequeue_burst() timeout on this device.
442 * This value should be in the range of *min_dequeue_timeout_ns* and
443 * *max_dequeue_timeout_ns* which previously provided in
444 * rte_event_dev_info_get()
445 * The value 0 is allowed, in which case, default dequeue timeout used.
446 * @see RTE_EVENT_DEV_CFG_PER_DEQUEUE_TIMEOUT
448 int32_t nb_events_limit;
449 /**< In a *closed system* this field is the limit on maximum number of
450 * events that can be inflight in the eventdev at a given time. The
451 * limit is required to ensure that the finite space in a closed system
452 * is not overwhelmed. The value cannot exceed the *max_num_events*
453 * as provided by rte_event_dev_info_get().
454 * This value should be set to -1 for *open system*.
456 uint8_t nb_event_queues;
457 /**< Number of event queues to configure on this device.
458 * This value cannot exceed the *max_event_queues* which previously
459 * provided in rte_event_dev_info_get()
461 uint8_t nb_event_ports;
462 /**< Number of event ports to configure on this device.
463 * This value cannot exceed the *max_event_ports* which previously
464 * provided in rte_event_dev_info_get()
466 uint32_t nb_event_queue_flows;
467 /**< Number of flows for any event queue on this device.
468 * This value cannot exceed the *max_event_queue_flows* which previously
469 * provided in rte_event_dev_info_get()
471 uint32_t nb_event_port_dequeue_depth;
472 /**< Maximum number of events can be dequeued at a time from an
473 * event port by this device.
474 * This value cannot exceed the *max_event_port_dequeue_depth*
475 * which previously provided in rte_event_dev_info_get().
476 * Ignored when device is not RTE_EVENT_DEV_CAP_BURST_MODE capable.
477 * @see rte_event_port_setup()
479 uint32_t nb_event_port_enqueue_depth;
480 /**< Maximum number of events can be enqueued at a time from an
481 * event port by this device.
482 * This value cannot exceed the *max_event_port_enqueue_depth*
483 * which previously provided in rte_event_dev_info_get().
484 * Ignored when device is not RTE_EVENT_DEV_CAP_BURST_MODE capable.
485 * @see rte_event_port_setup()
487 uint32_t event_dev_cfg;
488 /**< Event device config flags(RTE_EVENT_DEV_CFG_)*/
492 * Configure an event device.
494 * This function must be invoked first before any other function in the
495 * API. This function can also be re-invoked when a device is in the
498 * The caller may use rte_event_dev_info_get() to get the capability of each
499 * resources available for this event device.
502 * The identifier of the device to configure.
504 * The event device configuration structure.
507 * - 0: Success, device configured.
508 * - <0: Error code returned by the driver configuration function.
511 rte_event_dev_configure(uint8_t dev_id,
512 const struct rte_event_dev_config *dev_conf);
515 /* Event queue specific APIs */
517 /* Event queue configuration bitmap flags */
518 #define RTE_EVENT_QUEUE_CFG_ALL_TYPES (1ULL << 0)
519 /**< Allow ATOMIC,ORDERED,PARALLEL schedule type enqueue
521 * @see RTE_SCHED_TYPE_ORDERED, RTE_SCHED_TYPE_ATOMIC, RTE_SCHED_TYPE_PARALLEL
522 * @see rte_event_enqueue_burst()
524 #define RTE_EVENT_QUEUE_CFG_SINGLE_LINK (1ULL << 1)
525 /**< This event queue links only to a single event port.
527 * @see rte_event_port_setup(), rte_event_port_link()
530 /** Event queue configuration structure */
531 struct rte_event_queue_conf {
532 uint32_t nb_atomic_flows;
533 /**< The maximum number of active flows this queue can track at any
534 * given time. If the queue is configured for atomic scheduling (by
535 * applying the RTE_EVENT_QUEUE_CFG_ALL_TYPES flag to event_queue_cfg
536 * or RTE_SCHED_TYPE_ATOMIC flag to schedule_type), then the
537 * value must be in the range of [1, nb_event_queue_flows], which was
538 * previously provided in rte_event_dev_configure().
540 uint32_t nb_atomic_order_sequences;
541 /**< The maximum number of outstanding events waiting to be
542 * reordered by this queue. In other words, the number of entries in
543 * this queue’s reorder buffer.When the number of events in the
544 * reorder buffer reaches to *nb_atomic_order_sequences* then the
545 * scheduler cannot schedule the events from this queue and invalid
546 * event will be returned from dequeue until one or more entries are
548 * If the queue is configured for ordered scheduling (by applying the
549 * RTE_EVENT_QUEUE_CFG_ALL_TYPES flag to event_queue_cfg or
550 * RTE_SCHED_TYPE_ORDERED flag to schedule_type), then the value must
551 * be in the range of [1, nb_event_queue_flows], which was
552 * previously supplied to rte_event_dev_configure().
554 uint32_t event_queue_cfg;
555 /**< Queue cfg flags(EVENT_QUEUE_CFG_) */
556 uint8_t schedule_type;
557 /**< Queue schedule type(RTE_SCHED_TYPE_*).
558 * Valid when RTE_EVENT_QUEUE_CFG_ALL_TYPES bit is not set in
562 /**< Priority for this event queue relative to other event queues.
563 * The requested priority should in the range of
564 * [RTE_EVENT_DEV_PRIORITY_HIGHEST, RTE_EVENT_DEV_PRIORITY_LOWEST].
565 * The implementation shall normalize the requested priority to
566 * event device supported priority value.
567 * Valid when the device has RTE_EVENT_DEV_CAP_QUEUE_QOS capability
572 * Retrieve the default configuration information of an event queue designated
573 * by its *queue_id* from the event driver for an event device.
575 * This function intended to be used in conjunction with rte_event_queue_setup()
576 * where caller needs to set up the queue by overriding few default values.
579 * The identifier of the device.
581 * The index of the event queue to get the configuration information.
582 * The value must be in the range [0, nb_event_queues - 1]
583 * previously supplied to rte_event_dev_configure().
584 * @param[out] queue_conf
585 * The pointer to the default event queue configuration data.
587 * - 0: Success, driver updates the default event queue configuration data.
588 * - <0: Error code returned by the driver info get function.
590 * @see rte_event_queue_setup()
594 rte_event_queue_default_conf_get(uint8_t dev_id, uint8_t queue_id,
595 struct rte_event_queue_conf *queue_conf);
598 * Allocate and set up an event queue for an event device.
601 * The identifier of the device.
603 * The index of the event queue to setup. The value must be in the range
604 * [0, nb_event_queues - 1] previously supplied to rte_event_dev_configure().
606 * The pointer to the configuration data to be used for the event queue.
607 * NULL value is allowed, in which case default configuration used.
609 * @see rte_event_queue_default_conf_get()
612 * - 0: Success, event queue correctly set up.
613 * - <0: event queue configuration failed
616 rte_event_queue_setup(uint8_t dev_id, uint8_t queue_id,
617 const struct rte_event_queue_conf *queue_conf);
620 * The priority of the queue.
622 #define RTE_EVENT_QUEUE_ATTR_PRIORITY 0
624 * The number of atomic flows configured for the queue.
626 #define RTE_EVENT_QUEUE_ATTR_NB_ATOMIC_FLOWS 1
628 * The number of atomic order sequences configured for the queue.
630 #define RTE_EVENT_QUEUE_ATTR_NB_ATOMIC_ORDER_SEQUENCES 2
632 * The cfg flags for the queue.
634 #define RTE_EVENT_QUEUE_ATTR_EVENT_QUEUE_CFG 3
637 * Get an attribute from a queue.
639 * @param dev_id Eventdev id
640 * @param queue_id Eventdev queue id
641 * @param attr_id The attribute ID to retrieve
642 * @param[out] attr_value A pointer that will be filled in with the attribute
643 * value if successful
645 * @retval 0 Successfully returned value
646 * -EINVAL invalid device, queue or attr_id provided, or attr_value
650 rte_event_queue_attr_get(uint8_t dev_id, uint8_t queue_id, uint32_t attr_id,
651 uint32_t *attr_value);
653 /* Event port specific APIs */
655 /** Event port configuration structure */
656 struct rte_event_port_conf {
657 int32_t new_event_threshold;
658 /**< A backpressure threshold for new event enqueues on this port.
659 * Use for *closed system* event dev where event capacity is limited,
660 * and cannot exceed the capacity of the event dev.
661 * Configuring ports with different thresholds can make higher priority
662 * traffic less likely to be backpressured.
663 * For example, a port used to inject NIC Rx packets into the event dev
664 * can have a lower threshold so as not to overwhelm the device,
665 * while ports used for worker pools can have a higher threshold.
666 * This value cannot exceed the *nb_events_limit*
667 * which was previously supplied to rte_event_dev_configure().
668 * This should be set to '-1' for *open system*.
670 uint16_t dequeue_depth;
671 /**< Configure number of bulk dequeues for this event port.
672 * This value cannot exceed the *nb_event_port_dequeue_depth*
673 * which previously supplied to rte_event_dev_configure().
674 * Ignored when device is not RTE_EVENT_DEV_CAP_BURST_MODE capable.
676 uint16_t enqueue_depth;
677 /**< Configure number of bulk enqueues for this event port.
678 * This value cannot exceed the *nb_event_port_enqueue_depth*
679 * which previously supplied to rte_event_dev_configure().
680 * Ignored when device is not RTE_EVENT_DEV_CAP_BURST_MODE capable.
685 * Retrieve the default configuration information of an event port designated
686 * by its *port_id* from the event driver for an event device.
688 * This function intended to be used in conjunction with rte_event_port_setup()
689 * where caller needs to set up the port by overriding few default values.
692 * The identifier of the device.
694 * The index of the event port to get the configuration information.
695 * The value must be in the range [0, nb_event_ports - 1]
696 * previously supplied to rte_event_dev_configure().
697 * @param[out] port_conf
698 * The pointer to the default event port configuration data
700 * - 0: Success, driver updates the default event port configuration data.
701 * - <0: Error code returned by the driver info get function.
703 * @see rte_event_port_setup()
707 rte_event_port_default_conf_get(uint8_t dev_id, uint8_t port_id,
708 struct rte_event_port_conf *port_conf);
711 * Allocate and set up an event port for an event device.
714 * The identifier of the device.
716 * The index of the event port to setup. The value must be in the range
717 * [0, nb_event_ports - 1] previously supplied to rte_event_dev_configure().
719 * The pointer to the configuration data to be used for the queue.
720 * NULL value is allowed, in which case default configuration used.
722 * @see rte_event_port_default_conf_get()
725 * - 0: Success, event port correctly set up.
726 * - <0: Port configuration failed
727 * - (-EDQUOT) Quota exceeded(Application tried to link the queue configured
728 * with RTE_EVENT_QUEUE_CFG_SINGLE_LINK to more than one event ports)
731 rte_event_port_setup(uint8_t dev_id, uint8_t port_id,
732 const struct rte_event_port_conf *port_conf);
735 * The queue depth of the port on the enqueue side
737 #define RTE_EVENT_PORT_ATTR_ENQ_DEPTH 0
739 * The queue depth of the port on the dequeue side
741 #define RTE_EVENT_PORT_ATTR_DEQ_DEPTH 1
743 * The new event threshold of the port
745 #define RTE_EVENT_PORT_ATTR_NEW_EVENT_THRESHOLD 2
748 * Get an attribute from a port.
750 * @param dev_id Eventdev id
751 * @param port_id Eventdev port id
752 * @param attr_id The attribute ID to retrieve
753 * @param[out] attr_value A pointer that will be filled in with the attribute
754 * value if successful
756 * @retval 0 Successfully returned value
757 * -EINVAL Invalid device, port or attr_id, or attr_value was NULL
760 rte_event_port_attr_get(uint8_t dev_id, uint8_t port_id, uint32_t attr_id,
761 uint32_t *attr_value);
764 * Start an event device.
766 * The device start step is the last one and consists of setting the event
767 * queues to start accepting the events and schedules to event ports.
769 * On success, all basic functions exported by the API (event enqueue,
770 * event dequeue and so on) can be invoked.
773 * Event device identifier
775 * - 0: Success, device started.
776 * - -ESTALE : Not all ports of the device are configured
777 * - -ENOLINK: Not all queues are linked, which could lead to deadlock.
780 rte_event_dev_start(uint8_t dev_id);
783 * Stop an event device. The device can be restarted with a call to
784 * rte_event_dev_start()
787 * Event device identifier.
790 rte_event_dev_stop(uint8_t dev_id);
793 * Close an event device. The device cannot be restarted!
796 * Event device identifier
799 * - 0 on successfully closing device
800 * - <0 on failure to close device
801 * - (-EAGAIN) if device is busy
804 rte_event_dev_close(uint8_t dev_id);
806 /* Scheduler type definitions */
807 #define RTE_SCHED_TYPE_ORDERED 0
808 /**< Ordered scheduling
810 * Events from an ordered flow of an event queue can be scheduled to multiple
811 * ports for concurrent processing while maintaining the original event order.
812 * This scheme enables the user to achieve high single flow throughput by
813 * avoiding SW synchronization for ordering between ports which bound to cores.
815 * The source flow ordering from an event queue is maintained when events are
816 * enqueued to their destination queue within the same ordered flow context.
817 * An event port holds the context until application call
818 * rte_event_dequeue_burst() from the same port, which implicitly releases
820 * User may allow the scheduler to release the context earlier than that
821 * by invoking rte_event_enqueue_burst() with RTE_EVENT_OP_RELEASE operation.
823 * Events from the source queue appear in their original order when dequeued
824 * from a destination queue.
825 * Event ordering is based on the received event(s), but also other
826 * (newly allocated or stored) events are ordered when enqueued within the same
827 * ordered context. Events not enqueued (e.g. released or stored) within the
828 * context are considered missing from reordering and are skipped at this time
829 * (but can be ordered again within another context).
831 * @see rte_event_queue_setup(), rte_event_dequeue_burst(), RTE_EVENT_OP_RELEASE
834 #define RTE_SCHED_TYPE_ATOMIC 1
835 /**< Atomic scheduling
837 * Events from an atomic flow of an event queue can be scheduled only to a
838 * single port at a time. The port is guaranteed to have exclusive (atomic)
839 * access to the associated flow context, which enables the user to avoid SW
840 * synchronization. Atomic flows also help to maintain event ordering
841 * since only one port at a time can process events from a flow of an
844 * The atomic queue synchronization context is dedicated to the port until
845 * application call rte_event_dequeue_burst() from the same port,
846 * which implicitly releases the context. User may allow the scheduler to
847 * release the context earlier than that by invoking rte_event_enqueue_burst()
848 * with RTE_EVENT_OP_RELEASE operation.
850 * @see rte_event_queue_setup(), rte_event_dequeue_burst(), RTE_EVENT_OP_RELEASE
853 #define RTE_SCHED_TYPE_PARALLEL 2
854 /**< Parallel scheduling
856 * The scheduler performs priority scheduling, load balancing, etc. functions
857 * but does not provide additional event synchronization or ordering.
858 * It is free to schedule events from a single parallel flow of an event queue
859 * to multiple events ports for concurrent processing.
860 * The application is responsible for flow context synchronization and
861 * event ordering (SW synchronization).
863 * @see rte_event_queue_setup(), rte_event_dequeue_burst()
866 /* Event types to classify the event source */
867 #define RTE_EVENT_TYPE_ETHDEV 0x0
868 /**< The event generated from ethdev subsystem */
869 #define RTE_EVENT_TYPE_CRYPTODEV 0x1
870 /**< The event generated from crypodev subsystem */
871 #define RTE_EVENT_TYPE_TIMERDEV 0x2
872 /**< The event generated from timerdev subsystem */
873 #define RTE_EVENT_TYPE_CPU 0x3
874 /**< The event generated from cpu for pipelining.
875 * Application may use *sub_event_type* to further classify the event
877 #define RTE_EVENT_TYPE_ETH_RX_ADAPTER 0x4
878 /**< The event generated from event eth Rx adapter */
879 #define RTE_EVENT_TYPE_MAX 0x10
880 /**< Maximum number of event types */
882 /* Event enqueue operations */
883 #define RTE_EVENT_OP_NEW 0
884 /**< The event producers use this operation to inject a new event to the
887 #define RTE_EVENT_OP_FORWARD 1
888 /**< The CPU use this operation to forward the event to different event queue or
889 * change to new application specific flow or schedule type to enable
892 * This operation must only be enqueued to the same port that the
893 * event to be forwarded was dequeued from.
895 #define RTE_EVENT_OP_RELEASE 2
896 /**< Release the flow context associated with the schedule type.
898 * If current flow's scheduler type method is *RTE_SCHED_TYPE_ATOMIC*
899 * then this function hints the scheduler that the user has completed critical
900 * section processing in the current atomic context.
901 * The scheduler is now allowed to schedule events from the same flow from
902 * an event queue to another port. However, the context may be still held
903 * until the next rte_event_dequeue_burst() call, this call allows but does not
904 * force the scheduler to release the context early.
906 * Early atomic context release may increase parallelism and thus system
907 * performance, but the user needs to design carefully the split into critical
908 * vs non-critical sections.
910 * If current flow's scheduler type method is *RTE_SCHED_TYPE_ORDERED*
911 * then this function hints the scheduler that the user has done all that need
912 * to maintain event order in the current ordered context.
913 * The scheduler is allowed to release the ordered context of this port and
914 * avoid reordering any following enqueues.
916 * Early ordered context release may increase parallelism and thus system
919 * If current flow's scheduler type method is *RTE_SCHED_TYPE_PARALLEL*
920 * or no scheduling context is held then this function may be an NOOP,
921 * depending on the implementation.
923 * This operation must only be enqueued to the same port that the
924 * event to be released was dequeued from.
929 * The generic *rte_event* structure to hold the event attributes
930 * for dequeue and enqueue operation
937 /** Event attributes for dequeue or enqueue operation */
940 /**< Targeted flow identifier for the enqueue and
942 * The value must be in the range of
943 * [0, nb_event_queue_flows - 1] which
944 * previously supplied to rte_event_dev_configure().
946 uint32_t sub_event_type:8;
947 /**< Sub-event types based on the event source.
948 * @see RTE_EVENT_TYPE_CPU
950 uint32_t event_type:4;
951 /**< Event type to classify the event source.
952 * @see RTE_EVENT_TYPE_ETHDEV, (RTE_EVENT_TYPE_*)
955 /**< The type of event enqueue operation - new/forward/
956 * etc.This field is not preserved across an instance
957 * and is undefined on dequeue.
958 * @see RTE_EVENT_OP_NEW, (RTE_EVENT_OP_*)
961 /**< Reserved for future use */
962 uint8_t sched_type:2;
963 /**< Scheduler synchronization type (RTE_SCHED_TYPE_*)
964 * associated with flow id on a given event queue
965 * for the enqueue and dequeue operation.
968 /**< Targeted event queue identifier for the enqueue or
970 * The value must be in the range of
971 * [0, nb_event_queues - 1] which previously supplied to
972 * rte_event_dev_configure().
975 /**< Event priority relative to other events in the
976 * event queue. The requested priority should in the
977 * range of [RTE_EVENT_DEV_PRIORITY_HIGHEST,
978 * RTE_EVENT_DEV_PRIORITY_LOWEST].
979 * The implementation shall normalize the requested
980 * priority to supported priority value.
981 * Valid when the device has
982 * RTE_EVENT_DEV_CAP_EVENT_QOS capability.
985 /**< Implementation specific opaque value.
986 * An implementation may use this field to hold
987 * implementation specific value to share between
988 * dequeue and enqueue operation.
989 * The application should not modify this field.
996 /**< Opaque 64-bit value */
998 /**< Opaque event pointer */
999 struct rte_mbuf *mbuf;
1000 /**< mbuf pointer if dequeued event is associated with mbuf */
1004 /* Ethdev Rx adapter capability bitmap flags */
1005 #define RTE_EVENT_ETH_RX_ADAPTER_CAP_INTERNAL_PORT 0x1
1006 /**< This flag is sent when the packet transfer mechanism is in HW.
1007 * Ethdev can send packets to the event device using internal event port.
1009 #define RTE_EVENT_ETH_RX_ADAPTER_CAP_MULTI_EVENTQ 0x2
1010 /**< Adapter supports multiple event queues per ethdev. Every ethdev
1011 * Rx queue can be connected to a unique event queue.
1013 #define RTE_EVENT_ETH_RX_ADAPTER_CAP_OVERRIDE_FLOW_ID 0x4
1014 /**< The application can override the adapter generated flow ID in the
1015 * event. This flow ID can be specified when adding an ethdev Rx queue
1016 * to the adapter using the ev member of struct rte_event_eth_rx_adapter
1017 * @see struct rte_event_eth_rx_adapter_queue_conf::ev
1018 * @see struct rte_event_eth_rx_adapter_queue_conf::rx_queue_flags
1022 * Retrieve the event device's ethdev Rx adapter capabilities for the
1023 * specified ethernet port
1026 * The identifier of the device.
1028 * @param eth_port_id
1029 * The identifier of the ethernet device.
1032 * A pointer to memory filled with Rx event adapter capabilities.
1035 * - 0: Success, driver provides Rx event adapter capabilities for the
1037 * - <0: Error code returned by the driver function.
1041 rte_event_eth_rx_adapter_caps_get(uint8_t dev_id, uint8_t eth_port_id,
1044 struct rte_eventdev_driver;
1045 struct rte_eventdev_ops;
1046 struct rte_eventdev;
1048 typedef void (*event_schedule_t)(struct rte_eventdev *dev);
1049 /**< @internal Schedule one or more events in the event dev. */
1051 typedef uint16_t (*event_enqueue_t)(void *port, const struct rte_event *ev);
1052 /**< @internal Enqueue event on port of a device */
1054 typedef uint16_t (*event_enqueue_burst_t)(void *port,
1055 const struct rte_event ev[], uint16_t nb_events);
1056 /**< @internal Enqueue burst of events on port of a device */
1058 typedef uint16_t (*event_dequeue_t)(void *port, struct rte_event *ev,
1059 uint64_t timeout_ticks);
1060 /**< @internal Dequeue event from port of a device */
1062 typedef uint16_t (*event_dequeue_burst_t)(void *port, struct rte_event ev[],
1063 uint16_t nb_events, uint64_t timeout_ticks);
1064 /**< @internal Dequeue burst of events from port of a device */
1066 #define RTE_EVENTDEV_NAME_MAX_LEN (64)
1067 /**< @internal Max length of name of event PMD */
1071 * The data part, with no function pointers, associated with each device.
1073 * This structure is safe to place in shared memory to be common among
1074 * different processes in a multi-process configuration.
1076 struct rte_eventdev_data {
1078 /**< Socket ID where memory is allocated */
1080 /**< Device ID for this instance */
1082 /**< Number of event queues. */
1084 /**< Number of event ports. */
1086 /**< Array of pointers to ports. */
1087 struct rte_event_port_conf *ports_cfg;
1088 /**< Array of port configuration structures. */
1089 struct rte_event_queue_conf *queues_cfg;
1090 /**< Array of queue configuration structures. */
1091 uint16_t *links_map;
1092 /**< Memory to store queues to port connections. */
1094 /**< PMD-specific private data */
1095 uint32_t event_dev_cap;
1096 /**< Event device capabilities(RTE_EVENT_DEV_CAP_)*/
1097 struct rte_event_dev_config dev_conf;
1098 /**< Configuration applied to device. */
1101 uint8_t dev_started : 1;
1102 /**< Device state: STARTED(1)/STOPPED(0) */
1104 char name[RTE_EVENTDEV_NAME_MAX_LEN];
1105 /**< Unique identifier name */
1106 } __rte_cache_aligned;
1108 /** @internal The data structure associated with each event device. */
1109 struct rte_eventdev {
1110 event_schedule_t schedule;
1111 /**< Pointer to PMD schedule function. */
1112 event_enqueue_t enqueue;
1113 /**< Pointer to PMD enqueue function. */
1114 event_enqueue_burst_t enqueue_burst;
1115 /**< Pointer to PMD enqueue burst function. */
1116 event_enqueue_burst_t enqueue_new_burst;
1117 /**< Pointer to PMD enqueue burst function(op new variant) */
1118 event_enqueue_burst_t enqueue_forward_burst;
1119 /**< Pointer to PMD enqueue burst function(op forward variant) */
1120 event_dequeue_t dequeue;
1121 /**< Pointer to PMD dequeue function. */
1122 event_dequeue_burst_t dequeue_burst;
1123 /**< Pointer to PMD dequeue burst function. */
1125 struct rte_eventdev_data *data;
1126 /**< Pointer to device data */
1127 const struct rte_eventdev_ops *dev_ops;
1128 /**< Functions exported by PMD */
1129 struct rte_device *dev;
1130 /**< Device info. supplied by probing */
1133 uint8_t attached : 1;
1134 /**< Flag indicating the device is attached */
1135 } __rte_cache_aligned;
1137 extern struct rte_eventdev *rte_eventdevs;
1138 /** @internal The pool of rte_eventdev structures. */
1142 * Schedule one or more events in the event dev.
1144 * An event dev implementation may define this is a NOOP, for instance if
1145 * the event dev performs its scheduling in hardware.
1148 * The identifier of the device.
1151 rte_event_schedule(uint8_t dev_id)
1153 struct rte_eventdev *dev = &rte_eventdevs[dev_id];
1155 (*dev->schedule)(dev);
1158 static __rte_always_inline uint16_t
1159 __rte_event_enqueue_burst(uint8_t dev_id, uint8_t port_id,
1160 const struct rte_event ev[], uint16_t nb_events,
1161 const event_enqueue_burst_t fn)
1163 const struct rte_eventdev *dev = &rte_eventdevs[dev_id];
1165 #ifdef RTE_LIBRTE_EVENTDEV_DEBUG
1166 if (dev_id >= RTE_EVENT_MAX_DEVS || !rte_eventdevs[dev_id].attached) {
1167 rte_errno = -EINVAL;
1171 if (port_id >= dev->data->nb_ports) {
1172 rte_errno = -EINVAL;
1177 * Allow zero cost non burst mode routine invocation if application
1178 * requests nb_events as const one
1181 return (*dev->enqueue)(dev->data->ports[port_id], ev);
1183 return fn(dev->data->ports[port_id], ev, nb_events);
1187 * Enqueue a burst of events objects or an event object supplied in *rte_event*
1188 * structure on an event device designated by its *dev_id* through the event
1189 * port specified by *port_id*. Each event object specifies the event queue on
1190 * which it will be enqueued.
1192 * The *nb_events* parameter is the number of event objects to enqueue which are
1193 * supplied in the *ev* array of *rte_event* structure.
1195 * Event operations RTE_EVENT_OP_FORWARD and RTE_EVENT_OP_RELEASE must only be
1196 * enqueued to the same port that their associated events were dequeued from.
1198 * The rte_event_enqueue_burst() function returns the number of
1199 * events objects it actually enqueued. A return value equal to *nb_events*
1200 * means that all event objects have been enqueued.
1203 * The identifier of the device.
1205 * The identifier of the event port.
1207 * Points to an array of *nb_events* objects of type *rte_event* structure
1208 * which contain the event object enqueue operations to be processed.
1210 * The number of event objects to enqueue, typically number of
1211 * rte_event_port_enqueue_depth() available for this port.
1214 * The number of event objects actually enqueued on the event device. The
1215 * return value can be less than the value of the *nb_events* parameter when
1216 * the event devices queue is full or if invalid parameters are specified in a
1217 * *rte_event*. If the return value is less than *nb_events*, the remaining
1218 * events at the end of ev[] are not consumed and the caller has to take care
1219 * of them, and rte_errno is set accordingly. Possible errno values include:
1220 * - -EINVAL The port ID is invalid, device ID is invalid, an event's queue
1221 * ID is invalid, or an event's sched type doesn't match the
1222 * capabilities of the destination queue.
1223 * - -ENOSPC The event port was backpressured and unable to enqueue
1224 * one or more events. This error code is only applicable to
1226 * @see rte_event_port_enqueue_depth()
1228 static inline uint16_t
1229 rte_event_enqueue_burst(uint8_t dev_id, uint8_t port_id,
1230 const struct rte_event ev[], uint16_t nb_events)
1232 const struct rte_eventdev *dev = &rte_eventdevs[dev_id];
1234 return __rte_event_enqueue_burst(dev_id, port_id, ev, nb_events,
1235 dev->enqueue_burst);
1239 * Enqueue a burst of events objects of operation type *RTE_EVENT_OP_NEW* on
1240 * an event device designated by its *dev_id* through the event port specified
1243 * Provides the same functionality as rte_event_enqueue_burst(), expect that
1244 * application can use this API when the all objects in the burst contains
1245 * the enqueue operation of the type *RTE_EVENT_OP_NEW*. This specialized
1246 * function can provide the additional hint to the PMD and optimize if possible.
1248 * The rte_event_enqueue_new_burst() result is undefined if the enqueue burst
1249 * has event object of operation type != RTE_EVENT_OP_NEW.
1252 * The identifier of the device.
1254 * The identifier of the event port.
1256 * Points to an array of *nb_events* objects of type *rte_event* structure
1257 * which contain the event object enqueue operations to be processed.
1259 * The number of event objects to enqueue, typically number of
1260 * rte_event_port_enqueue_depth() available for this port.
1263 * The number of event objects actually enqueued on the event device. The
1264 * return value can be less than the value of the *nb_events* parameter when
1265 * the event devices queue is full or if invalid parameters are specified in a
1266 * *rte_event*. If the return value is less than *nb_events*, the remaining
1267 * events at the end of ev[] are not consumed and the caller has to take care
1268 * of them, and rte_errno is set accordingly. Possible errno values include:
1269 * - -EINVAL The port ID is invalid, device ID is invalid, an event's queue
1270 * ID is invalid, or an event's sched type doesn't match the
1271 * capabilities of the destination queue.
1272 * - -ENOSPC The event port was backpressured and unable to enqueue
1273 * one or more events. This error code is only applicable to
1275 * @see rte_event_port_enqueue_depth() rte_event_enqueue_burst()
1277 static inline uint16_t
1278 rte_event_enqueue_new_burst(uint8_t dev_id, uint8_t port_id,
1279 const struct rte_event ev[], uint16_t nb_events)
1281 const struct rte_eventdev *dev = &rte_eventdevs[dev_id];
1283 return __rte_event_enqueue_burst(dev_id, port_id, ev, nb_events,
1284 dev->enqueue_new_burst);
1288 * Enqueue a burst of events objects of operation type *RTE_EVENT_OP_FORWARD*
1289 * on an event device designated by its *dev_id* through the event port
1290 * specified by *port_id*.
1292 * Provides the same functionality as rte_event_enqueue_burst(), expect that
1293 * application can use this API when the all objects in the burst contains
1294 * the enqueue operation of the type *RTE_EVENT_OP_FORWARD*. This specialized
1295 * function can provide the additional hint to the PMD and optimize if possible.
1297 * The rte_event_enqueue_new_burst() result is undefined if the enqueue burst
1298 * has event object of operation type != RTE_EVENT_OP_FORWARD.
1301 * The identifier of the device.
1303 * The identifier of the event port.
1305 * Points to an array of *nb_events* objects of type *rte_event* structure
1306 * which contain the event object enqueue operations to be processed.
1308 * The number of event objects to enqueue, typically number of
1309 * rte_event_port_enqueue_depth() available for this port.
1312 * The number of event objects actually enqueued on the event device. The
1313 * return value can be less than the value of the *nb_events* parameter when
1314 * the event devices queue is full or if invalid parameters are specified in a
1315 * *rte_event*. If the return value is less than *nb_events*, the remaining
1316 * events at the end of ev[] are not consumed and the caller has to take care
1317 * of them, and rte_errno is set accordingly. Possible errno values include:
1318 * - -EINVAL The port ID is invalid, device ID is invalid, an event's queue
1319 * ID is invalid, or an event's sched type doesn't match the
1320 * capabilities of the destination queue.
1321 * - -ENOSPC The event port was backpressured and unable to enqueue
1322 * one or more events. This error code is only applicable to
1324 * @see rte_event_port_enqueue_depth() rte_event_enqueue_burst()
1326 static inline uint16_t
1327 rte_event_enqueue_forward_burst(uint8_t dev_id, uint8_t port_id,
1328 const struct rte_event ev[], uint16_t nb_events)
1330 const struct rte_eventdev *dev = &rte_eventdevs[dev_id];
1332 return __rte_event_enqueue_burst(dev_id, port_id, ev, nb_events,
1333 dev->enqueue_forward_burst);
1337 * Converts nanoseconds to *timeout_ticks* value for rte_event_dequeue_burst()
1339 * If the device is configured with RTE_EVENT_DEV_CFG_PER_DEQUEUE_TIMEOUT flag
1340 * then application can use this function to convert timeout value in
1341 * nanoseconds to implementations specific timeout value supplied in
1342 * rte_event_dequeue_burst()
1345 * The identifier of the device.
1347 * Wait time in nanosecond
1348 * @param[out] timeout_ticks
1349 * Value for the *timeout_ticks* parameter in rte_event_dequeue_burst()
1353 * - -ENOTSUP if the device doesn't support timeouts
1354 * - -EINVAL if *dev_id* is invalid or *timeout_ticks* is NULL
1355 * - other values < 0 on failure.
1357 * @see rte_event_dequeue_burst(), RTE_EVENT_DEV_CFG_PER_DEQUEUE_TIMEOUT
1358 * @see rte_event_dev_configure()
1362 rte_event_dequeue_timeout_ticks(uint8_t dev_id, uint64_t ns,
1363 uint64_t *timeout_ticks);
1366 * Dequeue a burst of events objects or an event object from the event port
1367 * designated by its *event_port_id*, on an event device designated
1370 * rte_event_dequeue_burst() does not dictate the specifics of scheduling
1371 * algorithm as each eventdev driver may have different criteria to schedule
1372 * an event. However, in general, from an application perspective scheduler may
1373 * use the following scheme to dispatch an event to the port.
1375 * 1) Selection of event queue based on
1376 * a) The list of event queues are linked to the event port.
1377 * b) If the device has RTE_EVENT_DEV_CAP_QUEUE_QOS capability then event
1378 * queue selection from list is based on event queue priority relative to
1379 * other event queue supplied as *priority* in rte_event_queue_setup()
1380 * c) If the device has RTE_EVENT_DEV_CAP_EVENT_QOS capability then event
1381 * queue selection from the list is based on event priority supplied as
1382 * *priority* in rte_event_enqueue_burst()
1383 * 2) Selection of event
1384 * a) The number of flows available in selected event queue.
1385 * b) Schedule type method associated with the event
1387 * The *nb_events* parameter is the maximum number of event objects to dequeue
1388 * which are returned in the *ev* array of *rte_event* structure.
1390 * The rte_event_dequeue_burst() function returns the number of events objects
1391 * it actually dequeued. A return value equal to *nb_events* means that all
1392 * event objects have been dequeued.
1394 * The number of events dequeued is the number of scheduler contexts held by
1395 * this port. These contexts are automatically released in the next
1396 * rte_event_dequeue_burst() invocation, or invoking rte_event_enqueue_burst()
1397 * with RTE_EVENT_OP_RELEASE operation can be used to release the
1400 * Event operations RTE_EVENT_OP_FORWARD and RTE_EVENT_OP_RELEASE must only be
1401 * enqueued to the same port that their associated events were dequeued from.
1404 * The identifier of the device.
1406 * The identifier of the event port.
1408 * Points to an array of *nb_events* objects of type *rte_event* structure
1409 * for output to be populated with the dequeued event objects.
1411 * The maximum number of event objects to dequeue, typically number of
1412 * rte_event_port_dequeue_depth() available for this port.
1414 * @param timeout_ticks
1415 * - 0 no-wait, returns immediately if there is no event.
1416 * - >0 wait for the event, if the device is configured with
1417 * RTE_EVENT_DEV_CFG_PER_DEQUEUE_TIMEOUT then this function will wait until
1418 * at least one event is available or *timeout_ticks* time.
1419 * if the device is not configured with RTE_EVENT_DEV_CFG_PER_DEQUEUE_TIMEOUT
1420 * then this function will wait until the event available or
1421 * *dequeue_timeout_ns* ns which was previously supplied to
1422 * rte_event_dev_configure()
1425 * The number of event objects actually dequeued from the port. The return
1426 * value can be less than the value of the *nb_events* parameter when the
1427 * event port's queue is not full.
1429 * @see rte_event_port_dequeue_depth()
1431 static inline uint16_t
1432 rte_event_dequeue_burst(uint8_t dev_id, uint8_t port_id, struct rte_event ev[],
1433 uint16_t nb_events, uint64_t timeout_ticks)
1435 struct rte_eventdev *dev = &rte_eventdevs[dev_id];
1437 #ifdef RTE_LIBRTE_EVENTDEV_DEBUG
1438 if (dev_id >= RTE_EVENT_MAX_DEVS || !rte_eventdevs[dev_id].attached) {
1439 rte_errno = -EINVAL;
1443 if (port_id >= dev->data->nb_ports) {
1444 rte_errno = -EINVAL;
1450 * Allow zero cost non burst mode routine invocation if application
1451 * requests nb_events as const one
1454 return (*dev->dequeue)(
1455 dev->data->ports[port_id], ev, timeout_ticks);
1457 return (*dev->dequeue_burst)(
1458 dev->data->ports[port_id], ev, nb_events,
1463 * Link multiple source event queues supplied in *queues* to the destination
1464 * event port designated by its *port_id* with associated service priority
1465 * supplied in *priorities* on the event device designated by its *dev_id*.
1467 * The link establishment shall enable the event port *port_id* from
1468 * receiving events from the specified event queue(s) supplied in *queues*
1470 * An event queue may link to one or more event ports.
1471 * The number of links can be established from an event queue to event port is
1472 * implementation defined.
1474 * Event queue(s) to event port link establishment can be changed at runtime
1475 * without re-configuring the device to support scaling and to reduce the
1476 * latency of critical work by establishing the link with more event ports
1480 * The identifier of the device.
1483 * Event port identifier to select the destination port to link.
1486 * Points to an array of *nb_links* event queues to be linked
1487 * to the event port.
1488 * NULL value is allowed, in which case this function links all the configured
1489 * event queues *nb_event_queues* which previously supplied to
1490 * rte_event_dev_configure() to the event port *port_id*
1493 * Points to an array of *nb_links* service priorities associated with each
1494 * event queue link to event port.
1495 * The priority defines the event port's servicing priority for
1496 * event queue, which may be ignored by an implementation.
1497 * The requested priority should in the range of
1498 * [RTE_EVENT_DEV_PRIORITY_HIGHEST, RTE_EVENT_DEV_PRIORITY_LOWEST].
1499 * The implementation shall normalize the requested priority to
1500 * implementation supported priority value.
1501 * NULL value is allowed, in which case this function links the event queues
1502 * with RTE_EVENT_DEV_PRIORITY_NORMAL servicing priority
1505 * The number of links to establish. This parameter is ignored if queues is
1509 * The number of links actually established. The return value can be less than
1510 * the value of the *nb_links* parameter when the implementation has the
1511 * limitation on specific queue to port link establishment or if invalid
1512 * parameters are specified in *queues*
1513 * If the return value is less than *nb_links*, the remaining links at the end
1514 * of link[] are not established, and the caller has to take care of them.
1515 * If return value is less than *nb_links* then implementation shall update the
1516 * rte_errno accordingly, Possible rte_errno values are
1517 * (-EDQUOT) Quota exceeded(Application tried to link the queue configured with
1518 * RTE_EVENT_QUEUE_CFG_SINGLE_LINK to more than one event ports)
1519 * (-EINVAL) Invalid parameter
1523 rte_event_port_link(uint8_t dev_id, uint8_t port_id,
1524 const uint8_t queues[], const uint8_t priorities[],
1528 * Unlink multiple source event queues supplied in *queues* from the destination
1529 * event port designated by its *port_id* on the event device designated
1532 * The unlink establishment shall disable the event port *port_id* from
1533 * receiving events from the specified event queue *queue_id*
1535 * Event queue(s) to event port unlink establishment can be changed at runtime
1536 * without re-configuring the device.
1539 * The identifier of the device.
1542 * Event port identifier to select the destination port to unlink.
1545 * Points to an array of *nb_unlinks* event queues to be unlinked
1546 * from the event port.
1547 * NULL value is allowed, in which case this function unlinks all the
1548 * event queue(s) from the event port *port_id*.
1551 * The number of unlinks to establish. This parameter is ignored if queues is
1555 * The number of unlinks actually established. The return value can be less
1556 * than the value of the *nb_unlinks* parameter when the implementation has the
1557 * limitation on specific queue to port unlink establishment or
1558 * if invalid parameters are specified.
1559 * If the return value is less than *nb_unlinks*, the remaining queues at the
1560 * end of queues[] are not established, and the caller has to take care of them.
1561 * If return value is less than *nb_unlinks* then implementation shall update
1562 * the rte_errno accordingly, Possible rte_errno values are
1563 * (-EINVAL) Invalid parameter
1567 rte_event_port_unlink(uint8_t dev_id, uint8_t port_id,
1568 uint8_t queues[], uint16_t nb_unlinks);
1571 * Retrieve the list of source event queues and its associated service priority
1572 * linked to the destination event port designated by its *port_id*
1573 * on the event device designated by its *dev_id*.
1576 * The identifier of the device.
1579 * Event port identifier.
1581 * @param[out] queues
1582 * Points to an array of *queues* for output.
1583 * The caller has to allocate *RTE_EVENT_MAX_QUEUES_PER_DEV* bytes to
1584 * store the event queue(s) linked with event port *port_id*
1586 * @param[out] priorities
1587 * Points to an array of *priorities* for output.
1588 * The caller has to allocate *RTE_EVENT_MAX_QUEUES_PER_DEV* bytes to
1589 * store the service priority associated with each event queue linked
1592 * The number of links established on the event port designated by its
1598 rte_event_port_links_get(uint8_t dev_id, uint8_t port_id,
1599 uint8_t queues[], uint8_t priorities[]);
1602 * Dump internal information about *dev_id* to the FILE* provided in *f*.
1605 * The identifier of the device.
1608 * A pointer to a file for output
1615 rte_event_dev_dump(uint8_t dev_id, FILE *f);
1617 /** Maximum name length for extended statistics counters */
1618 #define RTE_EVENT_DEV_XSTATS_NAME_SIZE 64
1621 * Selects the component of the eventdev to retrieve statistics from.
1623 enum rte_event_dev_xstats_mode {
1624 RTE_EVENT_DEV_XSTATS_DEVICE,
1625 RTE_EVENT_DEV_XSTATS_PORT,
1626 RTE_EVENT_DEV_XSTATS_QUEUE,
1630 * A name-key lookup element for extended statistics.
1632 * This structure is used to map between names and ID numbers
1633 * for extended ethdev statistics.
1635 struct rte_event_dev_xstats_name {
1636 char name[RTE_EVENT_DEV_XSTATS_NAME_SIZE];
1640 * Retrieve names of extended statistics of an event device.
1643 * The identifier of the event device.
1645 * The mode of statistics to retrieve. Choices include the device statistics,
1646 * port statistics or queue statistics.
1647 * @param queue_port_id
1648 * Used to specify the port or queue number in queue or port mode, and is
1649 * ignored in device mode.
1650 * @param[out] xstats_names
1651 * Block of memory to insert names into. Must be at least size in capacity.
1652 * If set to NULL, function returns required capacity.
1654 * Block of memory to insert ids into. Must be at least size in capacity.
1655 * If set to NULL, function returns required capacity. The id values returned
1656 * can be passed to *rte_event_dev_xstats_get* to select statistics.
1658 * Capacity of xstats_names (number of names).
1660 * - positive value lower or equal to size: success. The return value
1661 * is the number of entries filled in the stats table.
1662 * - positive value higher than size: error, the given statistics table
1663 * is too small. The return value corresponds to the size that should
1664 * be given to succeed. The entries in the table are not valid and
1665 * shall not be used by the caller.
1666 * - negative value on error:
1667 * -ENODEV for invalid *dev_id*
1668 * -EINVAL for invalid mode, queue port or id parameters
1669 * -ENOTSUP if the device doesn't support this function.
1672 rte_event_dev_xstats_names_get(uint8_t dev_id,
1673 enum rte_event_dev_xstats_mode mode,
1674 uint8_t queue_port_id,
1675 struct rte_event_dev_xstats_name *xstats_names,
1680 * Retrieve extended statistics of an event device.
1683 * The identifier of the device.
1685 * The mode of statistics to retrieve. Choices include the device statistics,
1686 * port statistics or queue statistics.
1687 * @param queue_port_id
1688 * Used to specify the port or queue number in queue or port mode, and is
1689 * ignored in device mode.
1691 * The id numbers of the stats to get. The ids can be got from the stat
1692 * position in the stat list from rte_event_dev_get_xstats_names(), or
1693 * by using rte_eventdev_get_xstats_by_name()
1694 * @param[out] values
1695 * The values for each stats request by ID.
1697 * The number of stats requested
1699 * - positive value: number of stat entries filled into the values array
1700 * - negative value on error:
1701 * -ENODEV for invalid *dev_id*
1702 * -EINVAL for invalid mode, queue port or id parameters
1703 * -ENOTSUP if the device doesn't support this function.
1706 rte_event_dev_xstats_get(uint8_t dev_id,
1707 enum rte_event_dev_xstats_mode mode,
1708 uint8_t queue_port_id,
1709 const unsigned int ids[],
1710 uint64_t values[], unsigned int n);
1713 * Retrieve the value of a single stat by requesting it by name.
1716 * The identifier of the device
1718 * The stat name to retrieve
1720 * If non-NULL, the numerical id of the stat will be returned, so that further
1721 * requests for the stat can be got using rte_eventdev_xstats_get, which will
1722 * be faster as it doesn't need to scan a list of names for the stat.
1723 * If the stat cannot be found, the id returned will be (unsigned)-1.
1725 * - positive value or zero: the stat value
1726 * - negative value: -EINVAL if stat not found, -ENOTSUP if not supported.
1729 rte_event_dev_xstats_by_name_get(uint8_t dev_id, const char *name,
1733 * Reset the values of the xstats of the selected component in the device.
1736 * The identifier of the device
1738 * The mode of the statistics to reset. Choose from device, queue or port.
1739 * @param queue_port_id
1740 * The queue or port to reset. 0 and positive values select ports and queues,
1741 * while -1 indicates all ports or queues.
1743 * Selects specific statistics to be reset. When NULL, all statistics selected
1744 * by *mode* will be reset. If non-NULL, must point to array of at least
1747 * The number of ids available from the *ids* array. Ignored when ids is NULL.
1749 * - zero: successfully reset the statistics to zero
1750 * - negative value: -EINVAL invalid parameters, -ENOTSUP if not supported.
1753 rte_event_dev_xstats_reset(uint8_t dev_id,
1754 enum rte_event_dev_xstats_mode mode,
1755 int16_t queue_port_id,
1756 const uint32_t ids[],
1763 #endif /* _RTE_EVENTDEV_H_ */