1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2017-2018 Intel Corporation
5 #ifndef _RTE_COMPRESSDEV_H_
6 #define _RTE_COMPRESSDEV_H_
9 * @file rte_compressdev.h
11 * RTE Compression Device APIs.
15 * All functions in this file may be changed or removed without prior notice.
17 * Defines comp device APIs for the provisioning of compression operations.
24 #include <rte_common.h>
29 * Parameter log base 2 range description.
30 * Final value will be 2^value.
32 struct rte_param_log2_range {
33 uint8_t min; /**< Minimum log2 value */
34 uint8_t max; /**< Maximum log2 value */
36 /**< If a range of sizes are supported,
37 * this parameter is used to indicate
38 * increments in base 2 log byte value
39 * that are supported between the minimum and maximum
43 /** Structure used to capture a capability of a comp device */
44 struct rte_compressdev_capabilities {
45 enum rte_comp_algorithm algo;
46 /* Compression algorithm */
47 uint64_t comp_feature_flags;
48 /**< Bitmask of flags for compression service features */
49 struct rte_param_log2_range window_size;
50 /**< Window size range in base two log byte values */
53 /** Macro used at end of comp PMD list */
54 #define RTE_COMP_END_OF_CAPABILITIES_LIST() \
55 { RTE_COMP_ALGO_UNSPECIFIED }
58 const struct rte_compressdev_capabilities *
59 rte_compressdev_capability_get(uint8_t dev_id,
60 enum rte_comp_algorithm algo);
63 * compression device supported feature flags
65 * @note New features flags should be added to the end of the list
67 * Keep these flags synchronised with rte_compressdev_get_feature_name()
69 #define RTE_COMPDEV_FF_HW_ACCELERATED (1ULL << 0)
70 /**< Operations are off-loaded to an external hardware accelerator */
71 #define RTE_COMPDEV_FF_CPU_SSE (1ULL << 1)
72 /**< Utilises CPU SIMD SSE instructions */
73 #define RTE_COMPDEV_FF_CPU_AVX (1ULL << 2)
74 /**< Utilises CPU SIMD AVX instructions */
75 #define RTE_COMPDEV_FF_CPU_AVX2 (1ULL << 3)
76 /**< Utilises CPU SIMD AVX2 instructions */
77 #define RTE_COMPDEV_FF_CPU_AVX512 (1ULL << 4)
78 /**< Utilises CPU SIMD AVX512 instructions */
79 #define RTE_COMPDEV_FF_CPU_NEON (1ULL << 5)
80 /**< Utilises CPU NEON instructions */
81 #define RTE_COMPDEV_FF_OP_DONE_IN_DEQUEUE (1ULL << 6)
82 /**< A PMD should set this if the bulk of the
83 * processing is done during the dequeue. It should leave it
84 * cleared if the processing is done during the enqueue (default).
85 * Applications can use this as a hint for tuning.
89 * Get the name of a compress device feature flag.
92 * The mask describing the flag
95 * The name of this flag, or NULL if it's not a valid feature flag.
99 rte_compressdev_get_feature_name(uint64_t flag);
101 /** comp device information */
102 struct rte_compressdev_info {
103 const char *driver_name; /**< Driver name. */
104 uint64_t feature_flags; /**< Feature flags */
105 const struct rte_compressdev_capabilities *capabilities;
106 /**< Array of devices supported capabilities */
107 uint16_t max_nb_queue_pairs;
108 /**< Maximum number of queues pairs supported by device.
109 * (If 0, there is no limit in maximum number of queue pairs)
113 /** comp device statistics */
114 struct rte_compressdev_stats {
115 uint64_t enqueued_count;
116 /**< Count of all operations enqueued */
117 uint64_t dequeued_count;
118 /**< Count of all operations dequeued */
120 uint64_t enqueue_err_count;
121 /**< Total error count on operations enqueued */
122 uint64_t dequeue_err_count;
123 /**< Total error count on operations dequeued */
128 * Get the device identifier for the named compress device.
131 * Device name to select the device structure
133 * - Returns compress device identifier on success.
134 * - Return -1 on failure to find named compress device.
138 rte_compressdev_get_dev_id(const char *name);
141 * Get the compress device name given a device identifier.
144 * Compress device identifier
146 * - Returns compress device name.
147 * - Returns NULL if compress device is not present.
151 rte_compressdev_name_get(uint8_t dev_id);
154 * Get the total number of compress devices that have been successfully
158 * - The total number of usable compress devices.
162 rte_compressdev_count(void);
165 * Get number and identifiers of attached comp devices that
166 * use the same compress driver.
171 * Output devices identifiers
173 * Maximal number of devices
176 * Returns number of attached compress devices.
180 rte_compressdev_devices_get(const char *driver_name, uint8_t *devices,
184 * Return the NUMA socket to which a device is connected.
187 * Compress device identifier
189 * The NUMA socket id to which the device is connected or
190 * a default of zero if the socket could not be determined.
191 * -1 if returned is the dev_id value is out of range.
195 rte_compressdev_socket_id(uint8_t dev_id);
197 /** Compress device configuration structure */
198 struct rte_compressdev_config {
200 /**< Socket on which to allocate resources */
201 uint16_t nb_queue_pairs;
202 /**< Total number of queue pairs to configure on a device */
203 uint16_t max_nb_priv_xforms;
204 /**< Max number of private_xforms which will be created on the device */
205 uint16_t max_nb_streams;
206 /**< Max number of streams which will be created on the device */
210 * Configure a device.
212 * This function must be invoked first before any other function in the
213 * API. This function can also be re-invoked when a device is in the
217 * Compress device identifier
219 * The compress device configuration
221 * - 0: Success, device configured.
222 * - <0: Error code returned by the driver configuration function.
226 rte_compressdev_configure(uint8_t dev_id,
227 struct rte_compressdev_config *config);
232 * The device start step is called after configuring the device and setting up
234 * On success, data-path functions exported by the API (enqueue/dequeue, etc)
238 * Compress device identifier
240 * - 0: Success, device started.
241 * - <0: Error code of the driver device start function.
245 rte_compressdev_start(uint8_t dev_id);
248 * Stop a device. The device can be restarted with a call to
249 * rte_compressdev_start()
252 * Compress device identifier
256 rte_compressdev_stop(uint8_t dev_id);
260 * The memory allocated in the device gets freed.
261 * After calling this function, in order to use
262 * the device again, it is required to
263 * configure the device again.
266 * Compress device identifier
269 * - 0 on successfully closing device
270 * - <0 on failure to close device
274 rte_compressdev_close(uint8_t dev_id);
277 * Allocate and set up a receive queue pair for a device.
278 * This should only be called when the device is stopped.
282 * Compress device identifier
283 * @param queue_pair_id
284 * The index of the queue pairs to set up. The
285 * value must be in the range [0, nb_queue_pair - 1]
286 * previously supplied to rte_compressdev_configure()
287 * @param max_inflight_ops
288 * Max number of ops which the qp will have to
289 * accommodate simultaneously
291 * The *socket_id* argument is the socket identifier
292 * in case of NUMA. The value can be *SOCKET_ID_ANY*
293 * if there is no NUMA constraint for the DMA memory
294 * allocated for the receive queue pair
296 * - 0: Success, queue pair correctly set up.
297 * - <0: Queue pair configuration failed
301 rte_compressdev_queue_pair_setup(uint8_t dev_id, uint16_t queue_pair_id,
302 uint32_t max_inflight_ops, int socket_id);
305 * Get the number of queue pairs on a specific comp device
308 * Compress device identifier
310 * - The number of configured queue pairs.
314 rte_compressdev_queue_pair_count(uint8_t dev_id);
318 * Retrieve the general I/O statistics of a device.
321 * The identifier of the device
323 * A pointer to a structure of type
324 * *rte_compressdev_stats* to be filled with the
325 * values of device counters
327 * - Zero if successful.
328 * - Non-zero otherwise.
332 rte_compressdev_stats_get(uint8_t dev_id, struct rte_compressdev_stats *stats);
335 * Reset the general I/O statistics of a device.
338 * The identifier of the device.
342 rte_compressdev_stats_reset(uint8_t dev_id);
345 * Retrieve the contextual information of a device.
348 * Compress device identifier
350 * A pointer to a structure of type *rte_compressdev_info*
351 * to be filled with the contextual information of the device
353 * @note The capabilities field of dev_info is set to point to the first
354 * element of an array of struct rte_compressdev_capabilities.
355 * The element after the last valid element has it's op field set to
356 * RTE_COMP_ALGO_LIST_END.
360 rte_compressdev_info_get(uint8_t dev_id, struct rte_compressdev_info *dev_info);
364 * Dequeue a burst of processed compression operations from a queue on the comp
365 * device. The dequeued operation are stored in *rte_comp_op* structures
366 * whose pointers are supplied in the *ops* array.
368 * The rte_compressdev_dequeue_burst() function returns the number of ops
369 * actually dequeued, which is the number of *rte_comp_op* data structures
370 * effectively supplied into the *ops* array.
372 * A return value equal to *nb_ops* indicates that the queue contained
373 * at least *nb_ops* operations, and this is likely to signify that other
374 * processed operations remain in the devices output queue. Applications
375 * implementing a "retrieve as many processed operations as possible" policy
376 * can check this specific case and keep invoking the
377 * rte_compressdev_dequeue_burst() function until a value less than
378 * *nb_ops* is returned.
380 * The rte_compressdev_dequeue_burst() function does not provide any error
381 * notification to avoid the corresponding overhead.
383 * @note: operation ordering is not maintained within the queue pair.
385 * @note: In case op status = OUT_OF_SPACE_TERMINATED, op.consumed=0 and the
386 * op must be resubmitted with the same input data and a larger output buffer.
387 * op.produced is usually 0, but in decompression cases a PMD may return > 0
388 * and the application may find it useful to inspect that data.
389 * This status is only returned on STATELESS ops.
391 * @note: In case op status = OUT_OF_SPACE_RECOVERABLE, op.produced can be used
392 * and next op in stream should continue on from op.consumed+1 with a fresh
394 * Consumed=0, produced=0 is an unusual but allowed case. There may be useful
395 * state/history stored in the PMD, even though no output was produced yet.
399 * Compress device identifier
401 * The index of the queue pair from which to retrieve
402 * processed operations. The value must be in the range
403 * [0, nb_queue_pair - 1] previously supplied to
404 * rte_compressdev_configure()
406 * The address of an array of pointers to
407 * *rte_comp_op* structures that must be
408 * large enough to store *nb_ops* pointers in it
410 * The maximum number of operations to dequeue
412 * - The number of operations actually dequeued, which is the number
413 * of pointers to *rte_comp_op* structures effectively supplied to the
418 rte_compressdev_dequeue_burst(uint8_t dev_id, uint16_t qp_id,
419 struct rte_comp_op **ops, uint16_t nb_ops);
422 * Enqueue a burst of operations for processing on a compression device.
424 * The rte_compressdev_enqueue_burst() function is invoked to place
425 * comp operations on the queue *qp_id* of the device designated by
428 * The *nb_ops* parameter is the number of operations to process which are
429 * supplied in the *ops* array of *rte_comp_op* structures.
431 * The rte_compressdev_enqueue_burst() function returns the number of
432 * operations it actually enqueued for processing. A return value equal to
433 * *nb_ops* means that all packets have been enqueued.
435 * @note All compression operations are Out-of-place (OOP) operations,
436 * as the size of the output data is different to the size of the input data.
438 * @note The rte_comp_op contains both input and output parameters and is the
439 * vehicle for the application to pass data into and out of the PMD. While an
440 * op is inflight, i.e. once it has been enqueued, the private_xform or stream
441 * attached to it and any mbufs or memory referenced by it should not be altered
442 * or freed by the application. The PMD may use or change some of this data at
443 * any time until it has been returned in a dequeue operation.
445 * @note The flush flag only applies to operations which return SUCCESS.
446 * In OUT_OF_SPACE cases whether STATEFUL or STATELESS, data in dest buffer
447 * is as if flush flag was FLUSH_NONE.
448 * @note flush flag only applies in compression direction. It has no meaning
450 * @note: operation ordering is not maintained within the queue pair.
453 * Compress device identifier
455 * The index of the queue pair on which operations
456 * are to be enqueued for processing. The value
457 * must be in the range [0, nb_queue_pairs - 1]
458 * previously supplied to *rte_compressdev_configure*
460 * The address of an array of *nb_ops* pointers
461 * to *rte_comp_op* structures which contain
462 * the operations to be processed
464 * The number of operations to process
466 * The number of operations actually enqueued on the device. The return
467 * value can be less than the value of the *nb_ops* parameter when the
468 * comp devices queue is full or if invalid parameters are specified in
473 rte_compressdev_enqueue_burst(uint8_t dev_id, uint16_t qp_id,
474 struct rte_comp_op **ops, uint16_t nb_ops);
477 * This should alloc a stream from the device's mempool and initialise it.
478 * The application should call this API when setting up for the stateful
479 * processing of a set of data on a device. The API can be called multiple
480 * times to set up a stream for each data set. The handle returned is only for
481 * use with ops of op_type STATEFUL and must be passed to the PMD
482 * with every op in the data stream
485 * Compress device identifier
489 * Pointer to where PMD's private stream handle should be stored
492 * - 0 if successful and valid stream handle
493 * - <0 in error cases
494 * - Returns -EINVAL if input parameters are invalid.
495 * - Returns -ENOTSUP if comp device does not support STATEFUL operations.
496 * - Returns -ENOTSUP if comp device does not support the comp transform.
497 * - Returns -ENOMEM if the private stream could not be allocated.
502 rte_compressdev_stream_create(uint8_t dev_id,
503 const struct rte_comp_xform *xform,
507 * This should clear the stream and return it to the device's mempool.
510 * Compress device identifier
513 * PMD's private stream data
517 * - <0 in error cases
518 * - Returns -EINVAL if input parameters are invalid.
519 * - Returns -ENOTSUP if comp device does not support STATEFUL operations.
520 * - Returns -EBUSY if can't free stream as there are inflight operations
524 rte_compressdev_stream_free(uint8_t dev_id, void *stream);
527 * This should alloc a private_xform from the device's mempool and initialise
528 * it. The application should call this API when setting up for stateless
529 * processing on a device. If it returns non-shareable, then the appl cannot
530 * share this handle with multiple in-flight ops and should call this API again
531 * to get a separate handle for every in-flight op.
532 * The handle returned is only valid for use with ops of op_type STATELESS.
535 * Compress device identifier
538 * @param private_xform
539 * Pointer to where PMD's private_xform handle should be stored
542 * - if successful returns 0
543 * and valid private_xform handle
544 * - <0 in error cases
545 * - Returns -EINVAL if input parameters are invalid.
546 * - Returns -ENOTSUP if comp device does not support the comp transform.
547 * - Returns -ENOMEM if the private_xform could not be allocated.
551 rte_compressdev_private_xform_create(uint8_t dev_id,
552 const struct rte_comp_xform *xform,
553 void **private_xform);
556 * This should clear the private_xform and return it to the device's mempool.
557 * It is the application's responsibility to ensure that private_xform data
558 * is not cleared while there are still in-flight operations using it.
561 * Compress device identifier
563 * @param private_xform
564 * PMD's private_xform data
568 * - <0 in error cases
569 * - Returns -EINVAL if input parameters are invalid.
573 rte_compressdev_private_xform_free(uint8_t dev_id, void *private_xform);
579 #endif /* _RTE_COMPRESSDEV_H_ */