1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2017 Cavium, Inc.
3 * Copyright(c) 2017-2018 Intel Corporation.
7 #ifndef __RTE_EVENT_TIMER_ADAPTER_H__
8 #define __RTE_EVENT_TIMER_ADAPTER_H__
13 * RTE Event Timer Adapter
15 * An event timer adapter has the following abstract working model:
21 * +-------+ bkt 0 +----v---+
24 * +---+---+ +---+---+ +---+---+---+---+
26 * | bkt n | | bkt 1 |<-> t0| t1| t2| tn|
28 * +---+---+ +---+---+ +---+---+---+---+
32 * | bkt 4 | | bkt 2 |<--- Current bucket
37 * +------+ bkt 3 +-------+
41 * - It has a virtual monotonically increasing 64-bit timer adapter clock based
42 * on *enum rte_event_timer_adapter_clk_src* clock source. The clock source
43 * could be a CPU clock, or a platform dependent external clock.
45 * - The application creates a timer adapter instance with given the clock
46 * source, the total number of event timers, and a resolution(expressed in ns)
47 * to traverse between the buckets.
49 * - Each timer adapter may have 0 to n buckets based on the configured
50 * max timeout(max_tmo_ns) and resolution(timer_tick_ns). Upon starting the
51 * timer adapter, the adapter starts ticking at *timer_tick_ns* resolution.
53 * - The application arms an event timer that will expire *timer_tick_ns*
56 * - The application can cancel an armed timer and no timer expiry event will be
59 * - If a timer expires then the library injects the timer expiry event in
60 * the designated event queue.
62 * - The timer expiry event will be received through *rte_event_dequeue_burst*.
64 * - The application frees the timer adapter instance.
66 * Multiple timer adapters can be created with a varying level of resolution
67 * for various expiry use cases that run in parallel.
69 * Before using the timer adapter, the application has to create and configure
70 * an event device along with the event port. Based on the event device
71 * capability it might require creating an additional event port to be used
72 * by the timer adapter.
74 * The application creates the event timer adapter using the
75 * ``rte_event_timer_adapter_create()``. The event device id is passed to this
76 * function, inside this function the event device capability is checked,
77 * and if an in-built port is absent the application uses the default
78 * function to create a new producer port.
80 * The application may also use the function
81 * ``rte_event_timer_adapter_create_ext()`` to have granular control over
82 * producer port creation in a case where the in-built port is absent.
84 * After creating the timer adapter, the application has to start it
85 * using ``rte_event_timer_adapter_start()``. The buckets are traversed from
86 * 0 to n; when the adapter ticks, the next bucket is visited. Each time,
87 * the list per bucket is processed, and timer expiry events are sent to the
88 * designated event queue.
90 * The application can arm one or more event timers using the
91 * ``rte_event_timer_arm_burst()``. The *timeout_ticks* represents the number
92 * of *timer_tick_ns* after which the timer has to expire. The timeout at
93 * which the timers expire can be grouped or be independent of each
94 * event timer instance. ``rte_event_timer_arm_tmo_tick_burst()`` addresses the
95 * former case and ``rte_event_timer_arm_burst()`` addresses the latter case.
97 * The application can cancel the timers from expiring using the
98 * ``rte_event_timer_cancel_burst()``.
100 * On the secondary process, ``rte_event_timer_adapter_lookup()`` can be used
101 * to get the timer adapter pointer from its id and use it to invoke fastpath
102 * operations such as arm and cancel.
104 * Some of the use cases of event timer adapter are Beacon Timers,
105 * Generic SW Timeout, Wireless MAC Scheduling, 3G Frame Protocols,
106 * Packet Scheduling, Protocol Retransmission Timers, Supervision Timers.
107 * All these use cases require high resolution and low time drift.
114 #include <rte_spinlock.h>
115 #include <rte_memory.h>
117 #include "rte_eventdev.h"
118 #include "rte_eventdev_trace_fp.h"
121 * Timer adapter clock source
123 enum rte_event_timer_adapter_clk_src {
124 RTE_EVENT_TIMER_ADAPTER_CPU_CLK,
125 /**< Use CPU clock as the clock source. */
126 RTE_EVENT_TIMER_ADAPTER_EXT_CLK0,
127 /**< Platform dependent external clock source 0. */
128 RTE_EVENT_TIMER_ADAPTER_EXT_CLK1,
129 /**< Platform dependent external clock source 1. */
130 RTE_EVENT_TIMER_ADAPTER_EXT_CLK2,
131 /**< Platform dependent external clock source 2. */
132 RTE_EVENT_TIMER_ADAPTER_EXT_CLK3,
133 /**< Platform dependent external clock source 3. */
136 #define RTE_EVENT_TIMER_ADAPTER_F_ADJUST_RES (1ULL << 0)
137 /**< The event timer adapter implementation may have constraints on the
138 * resolution (timer_tick_ns) and maximum timer expiry timeout(max_tmo_ns)
139 * based on the given timer adapter or system. If this flag is set, the
140 * implementation adjusts the resolution and maximum timeout to the best
141 * possible configuration. On successful timer adapter creation, the
142 * application can get the configured resolution and max timeout with
143 * ``rte_event_timer_adapter_get_info()``.
145 * @see struct rte_event_timer_adapter_info::min_resolution_ns
146 * @see struct rte_event_timer_adapter_info::max_tmo_ns
148 #define RTE_EVENT_TIMER_ADAPTER_F_SP_PUT (1ULL << 1)
149 /**< ``rte_event_timer_arm_burst()`` API to be used in single producer mode.
151 * @see struct rte_event_timer_adapter_conf::flags
154 #define RTE_EVENT_TIMER_ADAPTER_F_PERIODIC (1ULL << 2)
155 /**< Flag to configure an event timer adapter in periodic mode; non-periodic
156 * mode is the default. A timer will fire once or periodically until the timer
157 * is cancelled based on the adapter mode.
159 * @see struct rte_event_timer_adapter_conf::flags
163 * Timer adapter configuration structure
165 struct rte_event_timer_adapter_conf {
166 uint8_t event_dev_id;
167 /**< Event device identifier */
168 uint16_t timer_adapter_id;
169 /**< Event timer adapter identifier */
171 /**< Identifier of socket from which to allocate memory for adapter */
172 enum rte_event_timer_adapter_clk_src clk_src;
173 /**< Clock source for timer adapter */
174 uint64_t timer_tick_ns;
175 /**< Timer adapter resolution in ns */
177 /**< Maximum timer timeout(expiry) in ns */
179 /**< Total number of timers per adapter */
181 /**< Timer adapter config flags (RTE_EVENT_TIMER_ADAPTER_F_*) */
185 * Event timer adapter stats structure
187 struct rte_event_timer_adapter_stats {
188 uint64_t evtim_exp_count;
189 /**< Number of event timers that have expired. */
190 uint64_t ev_enq_count;
191 /**< Eventdev enqueue count */
192 uint64_t ev_inv_count;
193 /**< Invalid expiry event count */
194 uint64_t evtim_retry_count;
195 /**< Event timer retry count */
196 uint64_t adapter_tick_count;
197 /**< Tick count for the adapter, at its resolution */
200 struct rte_event_timer_adapter;
203 * Callback function type for producer port creation.
205 typedef int (*rte_event_timer_adapter_port_conf_cb_t)(uint16_t id,
206 uint8_t event_dev_id,
207 uint8_t *event_port_id,
211 * Create an event timer adapter.
213 * This function must be invoked first before any other function in the API.
216 * The event timer adapter configuration structure.
219 * A pointer to the new allocated event timer adapter on success.
220 * NULL on error with rte_errno set appropriately.
221 * Possible rte_errno values include:
222 * - ERANGE: timer_tick_ns is not in supported range.
223 * - ENOMEM: unable to allocate sufficient memory for adapter instances
224 * - EINVAL: invalid event device identifier specified in config
225 * - ENOSPC: maximum number of adapters already created
226 * - EIO: event device reconfiguration and restart error. The adapter
227 * reconfigures the event device with an additional port by default if it is
228 * required to use a service to manage timers. If the device had been started
229 * before this call, this error code indicates an error in restart following
230 * an error in reconfiguration, i.e., a combination of the two error codes.
232 struct rte_event_timer_adapter *
233 rte_event_timer_adapter_create(const struct rte_event_timer_adapter_conf *conf);
236 * Create a timer adapter with the supplied callback.
238 * This function can be used to have a more granular control over the timer
239 * adapter creation. If a built-in port is absent, then the function uses the
240 * callback provided to create and get the port id to be used as a producer
244 * The timer adapter configuration structure
246 * The port config callback function.
248 * Opaque pointer to the argument for the callback function
251 * A pointer to the new allocated event timer adapter on success.
252 * NULL on error with rte_errno set appropriately.
253 * Possible rte_errno values include:
254 * - ERANGE: timer_tick_ns is not in supported range.
255 * - ENOMEM: unable to allocate sufficient memory for adapter instances
256 * - EINVAL: invalid event device identifier specified in config
257 * - ENOSPC: maximum number of adapters already created
259 struct rte_event_timer_adapter *
260 rte_event_timer_adapter_create_ext(
261 const struct rte_event_timer_adapter_conf *conf,
262 rte_event_timer_adapter_port_conf_cb_t conf_cb,
266 * Timer adapter info structure.
268 struct rte_event_timer_adapter_info {
269 uint64_t min_resolution_ns;
270 /**< Minimum timer adapter resolution in ns */
272 /**< Maximum timer timeout(expire) in ns */
273 struct rte_event_timer_adapter_conf conf;
274 /**< Configured timer adapter attributes */
276 /**< Event timer adapter capabilities */
277 int16_t event_dev_port_id;
278 /**< Event device port ID, if applicable */
282 * Retrieve the contextual information of an event timer adapter.
285 * A pointer to the event timer adapter structure.
287 * @param[out] adapter_info
288 * A pointer to a structure of type *rte_event_timer_adapter_info* to be
289 * filled with the contextual information of the adapter.
292 * - 0: Success, driver updates the contextual information of the
294 * - <0: Error code returned by the driver info get function.
295 * - -EINVAL: adapter identifier invalid
297 * @see RTE_EVENT_TIMER_ADAPTER_F_ADJUST_RES,
298 * struct rte_event_timer_adapter_info
302 rte_event_timer_adapter_get_info(
303 const struct rte_event_timer_adapter *adapter,
304 struct rte_event_timer_adapter_info *adapter_info);
307 * Start a timer adapter.
309 * The adapter start step is the last one and consists of setting the timer
310 * adapter to start accepting the timers and schedules to event queues.
312 * On success, all basic functions exported by the API (timer arm,
313 * timer cancel and so on) can be invoked.
316 * A pointer to the event timer adapter structure.
319 * - 0: Success, adapter started.
320 * - <0: Error code returned by the driver start function.
321 * - -EINVAL if adapter identifier invalid
322 * - -ENOENT if software adapter but no service core mapped
323 * - -ENOTSUP if software adapter and more than one service core mapped
324 * - -EALREADY if adapter has already been started
327 * The eventdev to which the event_timer_adapter is connected needs to
328 * be started before calling rte_event_timer_adapter_start().
331 rte_event_timer_adapter_start(
332 const struct rte_event_timer_adapter *adapter);
335 * Stop an event timer adapter.
337 * The adapter can be restarted with a call to
338 * ``rte_event_timer_adapter_start()``.
341 * A pointer to the event timer adapter structure.
344 * - 0: Success, adapter stopped.
345 * - <0: Error code returned by the driver stop function.
346 * - -EINVAL if adapter identifier invalid
349 rte_event_timer_adapter_stop(const struct rte_event_timer_adapter *adapter);
352 * Lookup an event timer adapter using its identifier.
354 * If an event timer adapter was created in another process with the same
355 * identifier, this function will locate its state and set up access to it
356 * so that it can be used in this process.
359 * The event timer adapter identifier.
362 * A pointer to the event timer adapter matching the identifier on success.
363 * NULL on error with rte_errno set appropriately.
364 * Possible rte_errno values include:
365 * - ENOENT - requested entry not available to return.
367 struct rte_event_timer_adapter *
368 rte_event_timer_adapter_lookup(uint16_t adapter_id);
371 * Free an event timer adapter.
373 * Destroy an event timer adapter, freeing all resources.
375 * Before invoking this function, the application must wait for all the
376 * armed timers to expire or cancel the outstanding armed timers.
379 * A pointer to an event timer adapter structure.
382 * - 0: Successfully freed the event timer adapter resources.
383 * - <0: Failed to free the event timer adapter resources.
384 * - -EAGAIN: adapter is busy; timers outstanding
385 * - -EBUSY: stop hasn't been called for this adapter yet
386 * - -EINVAL: adapter id invalid, or adapter invalid
389 rte_event_timer_adapter_free(struct rte_event_timer_adapter *adapter);
392 * Retrieve the service ID of the event timer adapter. If the adapter doesn't
393 * use an rte_service function, this function returns -ESRCH.
396 * A pointer to an event timer adapter.
398 * @param [out] service_id
399 * A pointer to a uint32_t, to be filled in with the service id.
403 * - <0: Error code on failure
404 * - -ESRCH: the adapter does not require a service to operate
407 rte_event_timer_adapter_service_id_get(struct rte_event_timer_adapter *adapter,
408 uint32_t *service_id);
411 * Retrieve statistics for an event timer adapter instance.
414 * A pointer to an event timer adapter structure.
416 * A pointer to a structure to fill with statistics.
419 * - 0: Successfully retrieved.
420 * - <0: Failure; error code returned.
423 rte_event_timer_adapter_stats_get(struct rte_event_timer_adapter *adapter,
424 struct rte_event_timer_adapter_stats *stats);
427 * Reset statistics for an event timer adapter instance.
430 * A pointer to an event timer adapter structure.
433 * - 0: Successfully reset;
434 * - <0: Failure; error code returned.
437 rte_event_timer_adapter_stats_reset(struct rte_event_timer_adapter *adapter);
442 enum rte_event_timer_state {
443 RTE_EVENT_TIMER_NOT_ARMED = 0,
444 /**< Event timer not armed. */
445 RTE_EVENT_TIMER_ARMED = 1,
446 /**< Event timer successfully armed. */
447 RTE_EVENT_TIMER_CANCELED = 2,
448 /**< Event timer successfully canceled. */
449 RTE_EVENT_TIMER_ERROR = -1,
450 /**< Generic event timer error. */
451 RTE_EVENT_TIMER_ERROR_TOOEARLY = -2,
452 /**< Event timer timeout tick value is too small for the adapter to
453 * handle, given its configured resolution.
455 RTE_EVENT_TIMER_ERROR_TOOLATE = -3,
456 /**< Event timer timeout tick is greater than the maximum timeout.*/
460 * The generic *rte_event_timer* structure to hold the event timer attributes
461 * for arm and cancel operations.
464 struct rte_event_timer {
467 * Expiry event attributes. On successful event timer timeout,
468 * the following attributes will be used to inject the expiry event to
470 * - event_queue_id: Targeted event queue id for expiry events.
471 * - event_priority: Event priority of the event expiry event in the
472 * event queue relative to other events.
473 * - sched_type: Scheduling type of the expiry event.
474 * - flow_id: Flow id of the expiry event.
475 * - op: RTE_EVENT_OP_NEW
476 * - event_type: RTE_EVENT_TYPE_TIMER
478 volatile enum rte_event_timer_state state;
479 /**< State of the event timer. */
480 uint64_t timeout_ticks;
481 /**< Expiry timer ticks expressed in number of *timer_ticks_ns* from
483 * @see struct rte_event_timer_adapter_info::adapter_conf::timer_tick_ns
485 uint64_t impl_opaque[2];
486 /**< Implementation-specific opaque data.
487 * An event timer adapter implementation use this field to hold
488 * implementation specific values to share between the arm and cancel
489 * operations. The application should not modify this field.
491 uint8_t user_meta[0];
492 /**< Memory to store user specific metadata.
493 * The event timer adapter implementation should not modify this area.
495 } __rte_cache_aligned;
497 typedef uint16_t (*rte_event_timer_arm_burst_t)(
498 const struct rte_event_timer_adapter *adapter,
499 struct rte_event_timer **tims,
501 /**< @internal Enable event timers to enqueue timer events upon expiry */
502 typedef uint16_t (*rte_event_timer_arm_tmo_tick_burst_t)(
503 const struct rte_event_timer_adapter *adapter,
504 struct rte_event_timer **tims,
505 uint64_t timeout_tick,
507 /**< @internal Enable event timers with common expiration time */
508 typedef uint16_t (*rte_event_timer_cancel_burst_t)(
509 const struct rte_event_timer_adapter *adapter,
510 struct rte_event_timer **tims,
512 /**< @internal Prevent event timers from enqueuing timer events */
515 * @internal Data structure associated with each event timer adapter.
517 struct rte_event_timer_adapter {
518 rte_event_timer_arm_burst_t arm_burst;
519 /**< Pointer to driver arm_burst function. */
520 rte_event_timer_arm_tmo_tick_burst_t arm_tmo_tick_burst;
521 /**< Pointer to driver arm_tmo_tick_burst function. */
522 rte_event_timer_cancel_burst_t cancel_burst;
523 /**< Pointer to driver cancel function. */
524 struct rte_event_timer_adapter_data *data;
525 /**< Pointer to shared adapter data */
526 const struct rte_event_timer_adapter_ops *ops;
527 /**< Functions exported by adapter driver */
530 uint8_t allocated : 1;
531 /**< Flag to indicate that this adapter has been allocated */
532 } __rte_cache_aligned;
534 #define ADAPTER_VALID_OR_ERR_RET(adapter, retval) do { \
535 if (adapter == NULL || !adapter->allocated) \
539 #define FUNC_PTR_OR_ERR_RET(func, errval) do { \
540 if ((func) == NULL) \
544 #define FUNC_PTR_OR_NULL_RET_WITH_ERRNO(func, errval) do { \
545 if ((func) == NULL) { \
546 rte_errno = errval; \
552 * Arm a burst of event timers with separate expiration timeout tick for each
555 * Before calling this function, the application allocates
556 * ``struct rte_event_timer`` objects from mempool or huge page backed
557 * application buffers of desired size. On successful allocation,
558 * application updates the `struct rte_event_timer`` attributes such as
559 * expiry event attributes, timeout ticks from now.
560 * This function submits the event timer arm requests to the event timer adapter
561 * and on expiry, the events will be injected to designated event queue.
562 * Timer expiry events will be generated once or periodically until cancellation
563 * based on the adapter mode.
566 * A pointer to an event timer adapter structure.
568 * Pointer to an array of objects of type *rte_event_timer* structure.
570 * Number of event timers in the supplied array.
573 * The number of successfully armed event timers. The return value can be less
574 * than the value of the *nb_evtims* parameter. If the return value is less
575 * than *nb_evtims*, the remaining event timers at the end of *evtims*
576 * are not consumed, and the caller has to take care of them, and rte_errno
577 * is set accordingly. Possible errno values include:
578 * - EINVAL Invalid timer adapter, expiry event queue ID is invalid, or an
579 * expiry event's sched type doesn't match the capabilities of the
580 * destination event queue.
581 * - EAGAIN Specified timer adapter is not running
582 * - EALREADY A timer was encountered that was already armed
584 * @see RTE_EVENT_TIMER_ADAPTER_F_PERIODIC
587 static inline uint16_t
588 rte_event_timer_arm_burst(const struct rte_event_timer_adapter *adapter,
589 struct rte_event_timer **evtims,
592 #ifdef RTE_LIBRTE_EVENTDEV_DEBUG
593 ADAPTER_VALID_OR_ERR_RET(adapter, -EINVAL);
594 FUNC_PTR_OR_ERR_RET(adapter->arm_burst, -EINVAL);
596 rte_eventdev_trace_timer_arm_burst(adapter, (void **)evtims,
598 return adapter->arm_burst(adapter, evtims, nb_evtims);
602 * Arm a burst of event timers with same expiration timeout tick.
604 * Provides the same functionality as ``rte_event_timer_arm_burst()``, except
605 * that application can use this API when all the event timers have the
606 * same timeout expiration tick. This specialized function can provide the
607 * additional hint to the adapter implementation and optimize if possible.
610 * A pointer to an event timer adapter structure.
612 * Points to an array of objects of type *rte_event_timer* structure.
613 * @param timeout_ticks
614 * The number of ticks in which the timers should expire.
616 * Number of event timers in the supplied array.
619 * The number of successfully armed event timers. The return value can be less
620 * than the value of the *nb_evtims* parameter. If the return value is less
621 * than *nb_evtims*, the remaining event timers at the end of *evtims*
622 * are not consumed, and the caller has to take care of them, and rte_errno
623 * is set accordingly. Possible errno values include:
624 * - EINVAL Invalid timer adapter, expiry event queue ID is invalid, or an
625 * expiry event's sched type doesn't match the capabilities of the
626 * destination event queue.
627 * - EAGAIN Specified event timer adapter is not running
628 * - EALREADY A timer was encountered that was already armed
630 static inline uint16_t
631 rte_event_timer_arm_tmo_tick_burst(
632 const struct rte_event_timer_adapter *adapter,
633 struct rte_event_timer **evtims,
634 const uint64_t timeout_ticks,
635 const uint16_t nb_evtims)
637 #ifdef RTE_LIBRTE_EVENTDEV_DEBUG
638 ADAPTER_VALID_OR_ERR_RET(adapter, -EINVAL);
639 FUNC_PTR_OR_ERR_RET(adapter->arm_tmo_tick_burst, -EINVAL);
641 rte_eventdev_trace_timer_arm_tmo_tick_burst(adapter, timeout_ticks,
642 (void **)evtims, nb_evtims);
643 return adapter->arm_tmo_tick_burst(adapter, evtims, timeout_ticks,
648 * Cancel a burst of event timers from being scheduled to the event device.
651 * A pointer to an event timer adapter structure.
653 * Points to an array of objects of type *rte_event_timer* structure
655 * Number of event timer instances in the supplied array.
658 * The number of successfully canceled event timers. The return value can be
659 * less than the value of the *nb_evtims* parameter. If the return value is
660 * less than *nb_evtims*, the remaining event timers at the end of *evtims*
661 * are not consumed, and the caller has to take care of them, and rte_errno
662 * is set accordingly. Possible errno values include:
663 * - EINVAL Invalid timer adapter identifier
664 * - EAGAIN Specified timer adapter is not running
665 * - EALREADY A timer was encountered that was already canceled
667 static inline uint16_t
668 rte_event_timer_cancel_burst(const struct rte_event_timer_adapter *adapter,
669 struct rte_event_timer **evtims,
672 #ifdef RTE_LIBRTE_EVENTDEV_DEBUG
673 ADAPTER_VALID_OR_ERR_RET(adapter, -EINVAL);
674 FUNC_PTR_OR_ERR_RET(adapter->cancel_burst, -EINVAL);
676 rte_eventdev_trace_timer_cancel_burst(adapter, (void **)evtims,
678 return adapter->cancel_burst(adapter, evtims, nb_evtims);
681 #endif /* __RTE_EVENT_TIMER_ADAPTER_H__ */