1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2017 Intel Corporation.
6 #ifndef _RTE_EVENT_ETH_RX_ADAPTER_
7 #define _RTE_EVENT_ETH_RX_ADAPTER_
12 * RTE Event Ethernet Rx Adapter
14 * An eventdev-based packet processing application enqueues/dequeues mbufs
15 * to/from the event device. Packet flow from the ethernet device to the event
16 * device can be accomplished using either HW or SW mechanisms depending on the
17 * platform and the particular combination of ethernet and event devices. The
18 * event ethernet Rx adapter provides common APIs to configure the packet flow
19 * from the ethernet devices to event devices across both these transfer
22 * The adapter uses a EAL service core function for SW based packet transfer
23 * and uses the eventdev PMD functions to configure HW based packet transfer
24 * between the ethernet device and the event device.
26 * The ethernet Rx event adapter's functions are:
27 * - rte_event_eth_rx_adapter_create_ext()
28 * - rte_event_eth_rx_adapter_create()
29 * - rte_event_eth_rx_adapter_free()
30 * - rte_event_eth_rx_adapter_queue_add()
31 * - rte_event_eth_rx_adapter_queue_del()
32 * - rte_event_eth_rx_adapter_start()
33 * - rte_event_eth_rx_adapter_stop()
34 * - rte_event_eth_rx_adapter_stats_get()
35 * - rte_event_eth_rx_adapter_stats_reset()
36 * - rte_event_eth_rx_adapter_queue_conf_get()
38 * The application creates an ethernet to event adapter using
39 * rte_event_eth_rx_adapter_create_ext() or rte_event_eth_rx_adapter_create()
41 * The adapter needs to know which ethernet rx queues to poll for mbufs as well
42 * as event device parameters such as the event queue identifier, event
43 * priority and scheduling type that the adapter should use when constructing
44 * events. The rte_event_eth_rx_adapter_queue_add() function is provided for
46 * The servicing weight parameter in the rte_event_eth_rx_adapter_queue_conf
47 * is applicable when the Rx adapter uses a service core function and is
48 * intended to provide application control of the frequency of polling ethernet
49 * device receive queues, for example, the application may want to poll higher
50 * priority queues with a higher frequency but at the same time not starve
51 * lower priority queues completely. If this parameter is zero and the receive
52 * interrupt is enabled when configuring the device, the receive queue is
53 * interrupt driven; else, the queue is assigned a servicing weight of one.
55 * The application can start/stop the adapter using the
56 * rte_event_eth_rx_adapter_start() and the rte_event_eth_rx_adapter_stop()
57 * functions. If the adapter uses a rte_service function, then the application
58 * is also required to assign a core to the service function and control the
59 * service core using the rte_service APIs. The
60 * rte_event_eth_rx_adapter_service_id_get() function can be used to retrieve
61 * the service function ID of the adapter in this case.
63 * For SW based packet transfers, i.e., when the
64 * RTE_EVENT_ETH_RX_ADAPTER_CAP_INTERNAL_PORT is not set in the adapter's
65 * capabilities flags for a particular ethernet device, the service function
66 * temporarily enqueues events to an event buffer before batch enqueuing these
67 * to the event device. If the buffer fills up, the service function stops
68 * dequeuing packets from the ethernet device. The application may want to
69 * monitor the buffer fill level and instruct the service function to
70 * selectively buffer events. The application may also use some other
71 * criteria to decide which packets should enter the event device even when
72 * the event buffer fill level is low or may want to enqueue packets to an
73 * internal event port. The rte_event_eth_rx_adapter_cb_register() function
74 * allows the application to register a callback that selects which packets are
75 * enqueued to the event device by the SW adapter. The callback interface is
76 * event based so the callback can also modify the event data if it needs to.
85 #include <rte_service.h>
87 #include "rte_eventdev.h"
89 #define RTE_EVENT_ETH_RX_ADAPTER_MAX_INSTANCE 32
91 /* struct rte_event_eth_rx_adapter_queue_conf flags definitions */
92 #define RTE_EVENT_ETH_RX_ADAPTER_QUEUE_FLOW_ID_VALID 0x1
93 /**< This flag indicates the flow identifier is valid
94 * @see rte_event_eth_rx_adapter_queue_conf::rx_queue_flags
96 #define RTE_EVENT_ETH_RX_ADAPTER_QUEUE_EVENT_VECTOR 0x2
97 /**< This flag indicates that mbufs arriving on the queue need to be vectorized
98 * @see rte_event_eth_rx_adapter_queue_conf::rx_queue_flags
102 * Adapter configuration structure that the adapter configuration callback
103 * function is expected to fill out
104 * @see rte_event_eth_rx_adapter_conf_cb
106 struct rte_event_eth_rx_adapter_conf {
107 uint8_t event_port_id;
108 /**< Event port identifier, the adapter enqueues mbuf events to this
112 /**< The adapter can return early if it has processed at least
113 * max_nb_rx mbufs. This isn't treated as a requirement; batching may
114 * cause the adapter to process more than max_nb_rx mbufs.
119 * Function type used for adapter configuration callback. The callback is
120 * used to fill in members of the struct rte_event_eth_rx_adapter_conf, this
121 * callback is invoked when creating a SW service for packet transfer from
122 * ethdev queues to the event device. The SW service is created within the
123 * rte_event_eth_rx_adapter_queue_add() function if SW based packet transfers
124 * from ethdev queues to the event device are required.
127 * Adapter identifier.
130 * Event device identifier.
133 * Structure that needs to be populated by this callback.
136 * Argument to the callback. This is the same as the conf_arg passed to the
137 * rte_event_eth_rx_adapter_create_ext().
139 typedef int (*rte_event_eth_rx_adapter_conf_cb) (uint8_t id, uint8_t dev_id,
140 struct rte_event_eth_rx_adapter_conf *conf,
144 * Rx queue configuration structure
146 struct rte_event_eth_rx_adapter_queue_conf {
147 uint32_t rx_queue_flags;
148 /**< Flags for handling received packets
149 * @see RTE_EVENT_ETH_RX_ADAPTER_QUEUE_FLOW_ID_VALID
151 uint16_t servicing_weight;
152 /**< Relative polling frequency of ethernet receive queue when the
153 * adapter uses a service core function for ethernet to event device
154 * transfers. If it is set to zero, the Rx queue is interrupt driven
155 * (unless rx queue interrupts are not enabled for the ethernet
160 * The values from the following event fields will be used when
161 * queuing mbuf events:
162 * - event_queue_id: Targeted event queue ID for received packets.
163 * - event_priority: Event priority of packets from this Rx queue in
164 * the event queue relative to other events.
165 * - sched_type: Scheduling type for packets from this Rx queue.
166 * - flow_id: If the RTE_ETH_RX_EVENT_ADAPTER_QUEUE_FLOW_ID_VALID bit
167 * is set in rx_queue_flags, this flow_id is used for all
168 * packets received from this queue. Otherwise the flow ID
169 * is set to the RSS hash of the src and dst IPv4/6
172 * The event adapter sets ev.event_type to RTE_EVENT_TYPE_ETHDEV in the
177 * Indicates the maximum number for mbufs to combine and form a vector.
179 * @see rte_event_eth_rx_adapter_vector_limits::min_vector_sz
180 * @see rte_event_eth_rx_adapter_vector_limits::max_vector_sz
181 * Valid when RTE_EVENT_ETH_RX_ADAPTER_QUEUE_EVENT_VECTOR flag is set in
182 * @see rte_event_eth_rx_adapter_queue_conf::rx_queue_flags
184 uint64_t vector_timeout_ns;
186 * Indicates the maximum number of nanoseconds to wait for receiving
187 * mbufs. Should be within vectorization limits of the
189 * @see rte_event_eth_rx_adapter_vector_limits::min_vector_ns
190 * @see rte_event_eth_rx_adapter_vector_limits::max_vector_ns
191 * Valid when RTE_EVENT_ETH_RX_ADAPTER_QUEUE_EVENT_VECTOR flag is set in
192 * @see rte_event_eth_rx_adapter_queue_conf::rx_queue_flags
194 struct rte_mempool *vector_mp;
196 * Indicates the mempool that should be used for allocating
197 * rte_event_vector container.
198 * Should be created by using `rte_event_vector_pool_create`.
199 * Valid when RTE_EVENT_ETH_RX_ADAPTER_QUEUE_EVENT_VECTOR flag is set in
200 * @see rte_event_eth_rx_adapter_queue_conf::rx_queue_flags.
205 * A structure used to retrieve statistics for an eth rx adapter instance.
207 struct rte_event_eth_rx_adapter_stats {
208 uint64_t rx_poll_count;
209 /**< Receive queue poll count */
211 /**< Received packet count */
212 uint64_t rx_enq_count;
213 /**< Eventdev enqueue count */
214 uint64_t rx_enq_retry;
215 /**< Eventdev enqueue retry count */
217 /**< Received packet dropped count */
218 uint64_t rx_enq_start_ts;
219 /**< Rx enqueue start timestamp */
220 uint64_t rx_enq_block_cycles;
221 /**< Cycles for which the service is blocked by the event device,
222 * i.e, the service fails to enqueue to the event device.
224 uint64_t rx_enq_end_ts;
225 /**< Latest timestamp at which the service is unblocked
226 * by the event device. The start, end timestamps and
227 * block cycles can be used to compute the percentage of
228 * cycles the service is blocked by the event device.
230 uint64_t rx_intr_packets;
231 /**< Received packet count for interrupt mode Rx queues */
235 * A structure used to retrieve eth rx adapter vector limits.
237 struct rte_event_eth_rx_adapter_vector_limits {
239 /**< Minimum vector limit configurable.
240 * @see rte_event_eth_rx_adapter_event_vector_config::vector_sz
243 /**< Maximum vector limit configurable.
244 * @see rte_event_eth_rx_adapter_event_vector_config::vector_sz
247 /**< True if the size configured should be in log2.
248 * @see rte_event_eth_rx_adapter_event_vector_config::vector_sz
250 uint64_t min_timeout_ns;
251 /**< Minimum vector timeout configurable.
252 * @see rte_event_eth_rx_adapter_event_vector_config::vector_timeout_ns
254 uint64_t max_timeout_ns;
255 /**< Maximum vector timeout configurable.
256 * @see rte_event_eth_rx_adapter_event_vector_config::vector_timeout_ns
262 * Callback function invoked by the SW adapter before it continues
263 * to process events. The callback is passed the size of the enqueue
264 * buffer in the SW adapter and the occupancy of the buffer. The
265 * callback can use these values to decide which events are
266 * enqueued to the event device by the SW adapter. The callback may
267 * also enqueue events internally using its own event port. The SW
268 * adapter populates the event information based on the Rx queue
269 * configuration in the adapter. The callback can modify the this event
270 * information for the events to be enqueued by the SW adapter.
272 * The callback return value is the number of events from the
273 * beginning of the event array that are to be enqueued by
274 * the SW adapter. It is the callback's responsibility to arrange
275 * these events at the beginning of the array, if these events are
276 * not contiguous in the original array. The *nb_dropped* parameter is
277 * a pointer to the number of events dropped by the callback, this
278 * number is used by the adapter to indicate the number of dropped packets
279 * as part of its statistics.
282 * Port identifier of the Ethernet device.
284 * Receive queue index.
285 * @param enqueue_buf_size
286 * Total enqueue buffer size.
287 * @param enqueue_buf_count
288 * Event count in enqueue buffer.
292 * Event array length.
295 * @param[out] nb_dropped
296 * Packets dropped by callback.
298 * - The number of events to be enqueued by the SW adapter.
300 typedef uint16_t (*rte_event_eth_rx_adapter_cb_fn)(uint16_t eth_dev_id,
302 uint32_t enqueue_buf_size,
303 uint32_t enqueue_buf_count,
304 struct rte_event *ev,
307 uint16_t *nb_dropped);
310 * Create a new ethernet Rx event adapter with the specified identifier.
313 * The identifier of the ethernet Rx event adapter.
316 * The identifier of the device to configure.
319 * Callback function that fills in members of a
320 * struct rte_event_eth_rx_adapter_conf struct passed into
324 * Argument that is passed to the conf_cb function.
328 * - <0: Error code on failure
330 int rte_event_eth_rx_adapter_create_ext(uint8_t id, uint8_t dev_id,
331 rte_event_eth_rx_adapter_conf_cb conf_cb,
335 * Create a new ethernet Rx event adapter with the specified identifier.
336 * This function uses an internal configuration function that creates an event
337 * port. This default function reconfigures the event device with an
338 * additional event port and setups up the event port using the port_config
339 * parameter passed into this function. In case the application needs more
340 * control in configuration of the service, it should use the
341 * rte_event_eth_rx_adapter_create_ext() version.
344 * The identifier of the ethernet Rx event adapter.
347 * The identifier of the device to configure.
350 * Argument of type *rte_event_port_conf* that is passed to the conf_cb
355 * - <0: Error code on failure
357 int rte_event_eth_rx_adapter_create(uint8_t id, uint8_t dev_id,
358 struct rte_event_port_conf *port_config);
361 * Free an event adapter
364 * Adapter identifier.
368 * - <0: Error code on failure, If the adapter still has Rx queues
369 * added to it, the function returns -EBUSY.
371 int rte_event_eth_rx_adapter_free(uint8_t id);
374 * Add receive queue to an event adapter. After a queue has been
375 * added to the event adapter, the result of the application calling
376 * rte_eth_rx_burst(eth_dev_id, rx_queue_id, ..) is undefined.
379 * Adapter identifier.
382 * Port identifier of Ethernet device.
385 * Ethernet device receive queue index.
386 * If rx_queue_id is -1, then all Rx queues configured for
387 * the device are added. If the ethdev Rx queues can only be
388 * connected to a single event queue then rx_queue_id is
390 * @see RTE_EVENT_ETH_RX_ADAPTER_CAP_MULTI_EVENTQ
393 * Additional configuration structure of type *rte_event_eth_rx_adapter_conf*
396 * - 0: Success, Receive queue added correctly.
397 * - <0: Error code on failure.
398 * - (-EIO) device reconfiguration and restart error. The adapter reconfigures
399 * the event device with an additional port if it is required to use a service
400 * function for packet transfer from the ethernet device to the event device.
401 * If the device had been started before this call, this error code indicates
402 * an error in restart following an error in reconfiguration, i.e., a
403 * combination of the two error codes.
405 int rte_event_eth_rx_adapter_queue_add(uint8_t id,
408 const struct rte_event_eth_rx_adapter_queue_conf *conf);
411 * Delete receive queue from an event adapter.
414 * Adapter identifier.
417 * Port identifier of Ethernet device.
420 * Ethernet device receive queue index.
421 * If rx_queue_id is -1, then all Rx queues configured for
422 * the device are deleted. If the ethdev Rx queues can only be
423 * connected to a single event queue then rx_queue_id is
425 * @see RTE_EVENT_ETH_RX_ADAPTER_CAP_MULTI_EVENTQ
428 * - 0: Success, Receive queue deleted correctly.
429 * - <0: Error code on failure.
431 int rte_event_eth_rx_adapter_queue_del(uint8_t id, uint16_t eth_dev_id,
432 int32_t rx_queue_id);
435 * Start ethernet Rx event adapter
438 * Adapter identifier.
441 * - 0: Success, Adapter started correctly.
442 * - <0: Error code on failure.
445 * The eventdev to which the event_eth_rx_adapter is connected needs to
446 * be started before calling rte_event_eth_rx_adapter_start().
448 int rte_event_eth_rx_adapter_start(uint8_t id);
451 * Stop ethernet Rx event adapter
454 * Adapter identifier.
457 * - 0: Success, Adapter started correctly.
458 * - <0: Error code on failure.
460 int rte_event_eth_rx_adapter_stop(uint8_t id);
463 * Retrieve statistics for an adapter
466 * Adapter identifier.
469 * A pointer to structure used to retrieve statistics for an adapter.
472 * - 0: Success, retrieved successfully.
473 * - <0: Error code on failure.
475 int rte_event_eth_rx_adapter_stats_get(uint8_t id,
476 struct rte_event_eth_rx_adapter_stats *stats);
479 * Reset statistics for an adapter.
482 * Adapter identifier.
485 * - 0: Success, statistics reset successfully.
486 * - <0: Error code on failure.
488 int rte_event_eth_rx_adapter_stats_reset(uint8_t id);
491 * Retrieve the service ID of an adapter. If the adapter doesn't use
492 * a rte_service function, this function returns -ESRCH.
495 * Adapter identifier.
497 * @param [out] service_id
498 * A pointer to a uint32_t, to be filled in with the service id.
502 * - <0: Error code on failure, if the adapter doesn't use a rte_service
503 * function, this function returns -ESRCH.
505 int rte_event_eth_rx_adapter_service_id_get(uint8_t id, uint32_t *service_id);
508 * Register callback to process Rx packets, this is supported for
509 * SW based packet transfers.
510 * @see rte_event_eth_rx_cb_fn
513 * Adapter identifier.
515 * Port identifier of Ethernet device.
522 * - <0: Error code on failure.
524 int rte_event_eth_rx_adapter_cb_register(uint8_t id, uint16_t eth_dev_id,
525 rte_event_eth_rx_adapter_cb_fn cb_fn,
529 * Retrieve vector limits for a given event dev and eth dev pair.
530 * @see rte_event_eth_rx_adapter_vector_limits
533 * Event device identifier.
535 * Port identifier of the ethernet device.
536 * @param [out] limits
537 * A pointer to rte_event_eth_rx_adapter_vector_limits structure that has to
542 * - <0: Error code on failure.
545 int rte_event_eth_rx_adapter_vector_limits_get(
546 uint8_t dev_id, uint16_t eth_port_id,
547 struct rte_event_eth_rx_adapter_vector_limits *limits);
550 * Retrieve Rx queue config information.
553 * Adapter identifier.
556 * Port identifier of Ethernet device.
559 * Ethernet device receive queue index.
561 * @param[out] queue_conf
562 * Pointer to struct rte_event_eth_rx_adapter_queue_conf
565 * - 0: Success, Receive queue added correctly.
566 * - <0: Error code on failure.
569 int rte_event_eth_rx_adapter_queue_conf_get(uint8_t id,
571 uint16_t rx_queue_id,
572 struct rte_event_eth_rx_adapter_queue_conf *queue_conf);
578 #endif /* _RTE_EVENT_ETH_RX_ADAPTER_ */