--- /dev/null
+.. SPDX-License-Identifier: BSD-3-Clause
+ Copyright(c) 2017-2018 Cavium Networks.
+
+Compression Device Library
+===========================
+
+The compression framework provides a generic set of APIs to perform compression services
+as well as to query and configure compression devices both physical(hardware) and virtual(software)
+to perform those services. The framework currently only supports lossless compression schemes:
+Deflate and LZS.
+
+Device Management
+-----------------
+
+Device Creation
+~~~~~~~~~~~~~~~
+
+Physical compression devices are discovered during the bus probe of the EAL function
+which is executed at DPDK initialization, based on their unique device identifier.
+For eg. PCI devices can be identified using PCI BDF (bus/bridge, device, function).
+Specific physical compression devices, like other physical devices in DPDK can be
+white-listed or black-listed using the EAL command line options.
+
+Virtual devices can be created by two mechanisms, either using the EAL command
+line options or from within the application using an EAL API directly.
+
+From the command line using the --vdev EAL option
+
+.. code-block:: console
+
+ --vdev '<pmd name>,socket_id=0'
+
+.. Note::
+
+ * If DPDK application requires multiple software compression PMD devices then required
+ number of ``--vdev`` with appropriate libraries are to be added.
+
+ * An Application with multiple compression device instances exposed by the same PMD must
+ specify a unique name for each device.
+
+ Example: ``--vdev 'pmd0' --vdev 'pmd1'``
+
+Or, by using the rte_vdev_init API within the application code.
+
+.. code-block:: c
+
+ rte_vdev_init("<pmd_name>","socket_id=0")
+
+All virtual compression devices support the following initialization parameters:
+
+* ``socket_id`` - socket on which to allocate the device resources on.
+
+Device Identification
+~~~~~~~~~~~~~~~~~~~~~
+
+Each device, whether virtual or physical is uniquely designated by two
+identifiers:
+
+- A unique device index used to designate the compression device in all functions
+ exported by the compressdev API.
+
+- A device name used to designate the compression device in console messages, for
+ administration or debugging purposes.
+
+Device Configuration
+~~~~~~~~~~~~~~~~~~~~
+
+The configuration of each compression device includes the following operations:
+
+- Allocation of resources, including hardware resources if a physical device.
+- Resetting the device into a well-known default state.
+- Initialization of statistics counters.
+
+The ``rte_compressdev_configure`` API is used to configure a compression device.
+
+The ``rte_compressdev_config`` structure is used to pass the configuration
+parameters.
+
+See *DPDK API Reference* for details.
+
+Configuration of Queue Pairs
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Each compression device queue pair is individually configured through the
+``rte_compressdev_queue_pair_setup`` API.
+
+The ``max_inflight_ops`` is used to pass maximum number of
+rte_comp_op that could be present in a queue at-a-time.
+PMD then can allocate resources accordingly on a specified socket.
+
+See *DPDK API Reference* for details.
+
+Logical Cores, Memory and Queues Pair Relationships
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Library supports NUMA similarly as described in Cryptodev library section.
+
+A queue pair cannot be shared and should be exclusively used by a single processing
+context for enqueuing operations or dequeuing operations on the same compression device
+since sharing would require global locks and hinder performance. It is however possible
+to use a different logical core to dequeue an operation on a queue pair from the logical
+core on which it was enqueued. This means that a compression burst enqueue/dequeue
+APIs are a logical place to transition from one logical core to another in a
+data processing pipeline.
+
+Device Features and Capabilities
+---------------------------------
+
+Compression devices define their functionality through two mechanisms, global device
+features and algorithm features. Global devices features identify device
+wide level features which are applicable to the whole device such as supported hardware
+acceleration and CPU features. List of compression device features can be seen in the
+RTE_COMPDEV_FF_XXX macros.
+
+The algorithm features lists individual algo feature which device supports per-algorithm,
+such as a stateful compression/decompression, checksums operation etc. List of algorithm
+features can be seen in the RTE_COMP_FF_XXX macros.
+
+Capabilities
+~~~~~~~~~~~~
+Each PMD has a list of capabilities, including algorithms listed in
+enum ``rte_comp_algorithm`` and its associated feature flag and
+sliding window range in log base 2 value. Sliding window tells
+the minimum and maximum size of lookup window that algorithm uses
+to find duplicates.
+
+See *DPDK API Reference* for details.
+
+Each Compression poll mode driver defines its array of capabilities
+for each algorithm it supports. See PMD implementation for capability
+initialization.
+
+Capabilities Discovery
+~~~~~~~~~~~~~~~~~~~~~~
+
+PMD capability and features are discovered via ``rte_compressdev_info_get`` function.
+
+The ``rte_compressdev_info`` structure contains all the relevant information for the device.
+
+See *DPDK API Reference* for details.
+
+Compression Operation
+----------------------
+
+DPDK compression supports two types of compression methodologies:
+
+- Stateless, data associated to a compression operation is compressed without any reference
+ to another compression operation.
+
+- Stateful, data in each compression operation is compressed with reference to previous compression
+ operations in the same data stream i.e. history of data is maintained between the operations.
+
+For more explanation, please refer RFC https://www.ietf.org/rfc/rfc1951.txt
+
+Operation Representation
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Compression operation is described via ``struct rte_comp_op``, which contains both input and
+output data. The operation structure includes the operation type (stateless or stateful),
+the operation status and the priv_xform/stream handle, source, destination and checksum buffer
+pointers. It also contains the source mempool from which the operation is allocated.
+PMD updates consumed field with amount of data read from source buffer and produced
+field with amount of data of written into destination buffer along with status of
+operation. See section *Produced, Consumed And Operation Status* for more details.
+
+Compression operations mempool also has an ability to allocate private memory with the
+operation for application's purposes. Application software is responsible for specifying
+all the operation specific fields in the ``rte_comp_op`` structure which are then used
+by the compression PMD to process the requested operation.
+
+
+Operation Management and Allocation
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The compressdev library provides an API set for managing compression operations which
+utilize the Mempool Library to allocate operation buffers. Therefore, it ensures
+that the compression operation is interleaved optimally across the channels and
+ranks for optimal processing.
+
+A ``rte_comp_op`` contains a field indicating the pool it originated from.
+
+``rte_comp_op_alloc()`` and ``rte_comp_op_bulk_alloc()`` are used to allocate
+compression operations from a given compression operation mempool.
+The operation gets reset before being returned to a user so that operation
+is always in a good known state before use by the application.
+
+``rte_comp_op_free()`` is called by the application to return an operation to
+its allocating pool.
+
+See *DPDK API Reference* for details.
+
+Passing source data as mbuf-chain
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+If input data is scattered across several different buffers, then
+Application can either parse through all such buffers and make one
+mbuf-chain and enqueue it for processing or, alternatively, it can
+make multiple sequential enqueue_burst() calls for each of them
+processing them statefully. See *Compression API Stateful Operation*
+for stateful processing of ops.
+
+Operation Status
+~~~~~~~~~~~~~~~~
+Each operation carries a status information updated by PMD after it is processed.
+following are currently supported status:
+
+- RTE_COMP_OP_STATUS_SUCCESS,
+ Operation is successfully completed
+
+- RTE_COMP_OP_STATUS_NOT_PROCESSED,
+ Operation has not yet been processed by the device
+
+- RTE_COMP_OP_STATUS_INVALID_ARGS,
+ Operation failed due to invalid arguments in request
+
+- RTE_COMP_OP_STATUS_ERROR,
+ Operation failed because of internal error
+
+- RTE_COMP_OP_STATUS_INVALID_STATE,
+ Operation is invoked in invalid state
+
+- RTE_COMP_OP_STATUS_OUT_OF_SPACE_TERMINATED,
+ Output buffer ran out of space during processing. Error case,
+ PMD cannot continue from here.
+
+- RTE_COMP_OP_STATUS_OUT_OF_SPACE_RECOVERABLE,
+ Output buffer ran out of space before operation completed, but this
+ is not an error case. Output data up to op.produced can be used and
+ next op in the stream should continue on from op.consumed+1.
+
+Produced, Consumed And Operation Status
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- If status is RTE_COMP_OP_STATUS_SUCCESS,
+ consumed = amount of data read from input buffer, and
+ produced = amount of data written in destination buffer
+- If status is RTE_COMP_OP_STATUS_FAILURE,
+ consumed = produced = 0 or undefined
+- If status is RTE_COMP_OP_STATUS_OUT_OF_SPACE_TERMINATED,
+ consumed = 0 and
+ produced = usually 0, but in decompression cases a PMD may return > 0
+ i.e. amount of data successfully produced until out of space condition
+ hit. Application can consume output data in this case, if required.
+- If status is RTE_COMP_OP_STATUS_OUT_OF_SPACE_RECOVERABLE,
+ consumed = amount of data read, and
+ produced = amount of data successfully produced until
+ out of space condition hit. PMD has ability to recover
+ from here, so application can submit next op from
+ consumed+1 and a destination buffer with available space.
+
+Transforms
+----------
+
+Compression transforms (``rte_comp_xform``) are the mechanism
+to specify the details of the compression operation such as algorithm,
+window size and checksum.
+
+Compression API Hash support
+----------------------------
+
+Compression API allows application to enable digest calculation
+alongside compression and decompression of data. A PMD reflects its
+support for hash algorithms via capability algo feature flags.
+If supported, PMD calculates digest always on plaintext i.e.
+before compression and after decompression.
+
+Currently supported list of hash algos are SHA-1 and SHA2 family
+SHA256.
+
+See *DPDK API Reference* for details.
+
+If required, application should set valid hash algo in compress
+or decompress xforms during ``rte_compressdev_stream_create()``
+or ``rte_compressdev_private_xform_create()`` and pass a valid
+output buffer in ``rte_comp_op`` hash field struct to store the
+resulting digest. Buffer passed should be contiguous and large
+enough to store digest which is 20 bytes for SHA-1 and
+32 bytes for SHA2-256.
+
+Compression API Stateless operation
+------------------------------------
+
+An op is processed stateless if it has
+- op_type set to RTE_COMP_OP_STATELESS
+- flush value set to RTE_FLUSH_FULL or RTE_FLUSH_FINAL
+(required only on compression side),
+- All required input in source buffer
+
+When all of the above conditions are met, PMD initiates stateless processing
+and releases acquired resources after processing of current operation is
+complete. Application can enqueue multiple stateless ops in a single burst
+and must attach priv_xform handle to such ops.
+
+priv_xform in Stateless operation
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+priv_xform is PMD internally managed private data that it maintains to do stateless processing.
+priv_xforms are initialized provided a generic xform structure by an application via making call
+to ``rte_comp_private_xform_create``, at an output PMD returns an opaque priv_xform reference.
+If PMD support SHAREABLE priv_xform indicated via algorithm feature flag, then application can
+attach same priv_xform with many stateless ops at-a-time. If not, then application needs to
+create as many priv_xforms as it expects to have stateless operations in-flight.
+
+.. figure:: img/stateless-op.*
+
+ Stateless Ops using Non-Shareable priv_xform
+
+
+.. figure:: img/stateless-op-shared.*
+
+ Stateless Ops using Shareable priv_xform
+
+
+Application should call ``rte_compressdev_private_xform_create()`` and attach to stateless op before
+enqueuing them for processing and free via ``rte_compressdev_private_xform_free()`` during termination.
+
+An example pseudocode to setup and process NUM_OPS stateless ops with each of length OP_LEN
+using priv_xform would look like:
+
+.. code-block:: c
+
+ /*
+ * pseudocode for stateless compression
+ */
+
+ uint8_t cdev_id = rte_compdev_get_dev_id(<pmd name>);
+
+ /* configure the device. */
+ if (rte_compressdev_configure(cdev_id, &conf) < 0)
+ rte_exit(EXIT_FAILURE, "Failed to configure compressdev %u", cdev_id);
+
+ if (rte_compressdev_queue_pair_setup(cdev_id, 0, NUM_MAX_INFLIGHT_OPS,
+ socket_id()) < 0)
+ rte_exit(EXIT_FAILURE, "Failed to setup queue pair\n");
+
+ if (rte_compressdev_start(cdev_id) < 0)
+ rte_exit(EXIT_FAILURE, "Failed to start device\n");
+
+ /* setup compress transform */
+ struct rte_compress_compress_xform compress_xform = {
+ .type = RTE_COMP_COMPRESS,
+ .compress = {
+ .algo = RTE_COMP_ALGO_DEFLATE,
+ .deflate = {
+ .huffman = RTE_COMP_HUFFMAN_DEFAULT
+ },
+ .level = RTE_COMP_LEVEL_PMD_DEFAULT,
+ .chksum = RTE_COMP_CHECKSUM_NONE,
+ .window_size = DEFAULT_WINDOW_SIZE,
+ .hash_algo = RTE_COMP_HASH_ALGO_NONE
+ }
+ };
+
+ /* create priv_xform and initialize it for the compression device. */
+ void *priv_xform = NULL;
+ rte_compressdev_info_get(cdev_id, &dev_info);
+ if(dev_info.capability->comps_feature_flag & RTE_COMP_FF_SHAREABLE_PRIV_XFORM) {
+ rte_comp_priv_xform_create(cdev_id, &compress_xform, &priv_xform);
+ } else {
+ shareable = 0;
+ }
+
+ /* create operation pool via call to rte_comp_op_pool_create and alloc ops */
+ rte_comp_op_bulk_alloc(op_pool, comp_ops, NUM_OPS);
+
+ /* prepare ops for compression operations */
+ for (i = 0; i < NUM_OPS; i++) {
+ struct rte_comp_op *op = comp_ops[i];
+ if (!shareable)
+ rte_priv_xform_create(cdev_id, &compress_xform, &op->priv_xform)
+ else
+ op->priv_xform = priv_xform;
+ op->type = RTE_COMP_OP_STATELESS;
+ op->flush = RTE_COMP_FLUSH_FINAL;
+
+ op->src.offset = 0;
+ op->dst.offset = 0;
+ op->src.length = OP_LEN;
+ op->input_chksum = 0;
+ setup op->m_src and op->m_dst;
+ }
+ num_enqd = rte_compressdev_enqueue_burst(cdev_id, 0, comp_ops, NUM_OPS);
+ /* wait for this to complete before enqueing next*/
+ do {
+ num_deque = rte_compressdev_dequeue_burst(cdev_id, 0 , &processed_ops, NUM_OPS);
+ } while (num_dqud < num_enqd);
+
+
+Stateless and OUT_OF_SPACE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+OUT_OF_SPACE is a condition when output buffer runs out of space and where PMD
+still has more data to produce. If PMD runs into such condition, then PMD returns
+RTE_COMP_OP_OUT_OF_SPACE_TERMINATED error. In such case, PMD resets itself and can set
+consumed=0 and produced=amount of output it could produce before hitting out_of_space.
+Application would need to resubmit the whole input with a larger output buffer, if it
+wants the operation to be completed.
+
+Hash in Stateless
+~~~~~~~~~~~~~~~~~
+If hash is enabled, digest buffer will contain valid data after op is successfully
+processed i.e. dequeued with status = RTE_COMP_OP_STATUS_SUCCESS.
+
+Checksum in Stateless
+~~~~~~~~~~~~~~~~~~~~~
+If checksum is enabled, checksum will only be available after op is successfully
+processed i.e. dequeued with status = RTE_COMP_OP_STATUS_SUCCESS.
+
+Compression API Stateful operation
+-----------------------------------
+
+Compression API provide RTE_COMP_FF_STATEFUL_COMPRESSION and
+RTE_COMP_FF_STATEFUL_DECOMPRESSION feature flag for PMD to reflect
+its support for Stateful operations.
+
+A Stateful operation in DPDK compression means application invokes enqueue
+burst() multiple times to process related chunk of data because
+application broke data into several ops.
+
+In such case
+- ops are setup with op_type RTE_COMP_OP_STATEFUL,
+- all ops except last set to flush value = RTE_COMP_NO/SYNC_FLUSH
+and last set to flush value RTE_COMP_FULL/FINAL_FLUSH.
+
+In case of either one or all of the above conditions, PMD initiates
+stateful processing and releases acquired resources after processing
+operation with flush value = RTE_COMP_FLUSH_FULL/FINAL is complete.
+Unlike stateless, application can enqueue only one stateful op from
+a particular stream at a time and must attach stream handle
+to each op.
+
+Stream in Stateful operation
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+`stream` in DPDK compression is a logical entity which identifies related set of ops, say, a one large
+file broken into multiple chunks then file is represented by a stream and each chunk of that file is
+represented by compression op `rte_comp_op`. Whenever application wants a stateful processing of such
+data, then it must get a stream handle via making call to ``rte_comp_stream_create()``
+with xform, at an output the target PMD will return an opaque stream handle to application which
+it must attach to all of the ops carrying data of that stream. In stateful processing, every op
+requires previous op data for compression/decompression. A PMD allocates and set up resources such
+as history, states, etc. within a stream, which are maintained during the processing of the related ops.
+
+Unlike priv_xforms, stream is always a NON_SHAREABLE entity. One stream handle must be attached to only
+one set of related ops and cannot be reused until all of them are processed with status Success or failure.
+
+.. figure:: img/stateful-op.*
+
+ Stateful Ops
+
+
+Application should call ``rte_comp_stream_create()`` and attach to op before
+enqueuing them for processing and free via ``rte_comp_stream_free()`` during
+termination. All ops that are to be processed statefully should carry *same* stream.
+
+See *DPDK API Reference* document for details.
+
+An example pseudocode to set up and process a stream having NUM_CHUNKS with each chunk size of CHUNK_LEN would look like:
+
+.. code-block:: c
+
+ /*
+ * pseudocode for stateful compression
+ */
+
+ uint8_t cdev_id = rte_compdev_get_dev_id(<pmd name>);
+
+ /* configure the device. */
+ if (rte_compressdev_configure(cdev_id, &conf) < 0)
+ rte_exit(EXIT_FAILURE, "Failed to configure compressdev %u", cdev_id);
+
+ if (rte_compressdev_queue_pair_setup(cdev_id, 0, NUM_MAX_INFLIGHT_OPS,
+ socket_id()) < 0)
+ rte_exit(EXIT_FAILURE, "Failed to setup queue pair\n");
+
+ if (rte_compressdev_start(cdev_id) < 0)
+ rte_exit(EXIT_FAILURE, "Failed to start device\n");
+
+ /* setup compress transform. */
+ struct rte_compress_compress_xform compress_xform = {
+ .type = RTE_COMP_COMPRESS,
+ .compress = {
+ .algo = RTE_COMP_ALGO_DEFLATE,
+ .deflate = {
+ .huffman = RTE_COMP_HUFFMAN_DEFAULT
+ },
+ .level = RTE_COMP_LEVEL_PMD_DEFAULT,
+ .chksum = RTE_COMP_CHECKSUM_NONE,
+ .window_size = DEFAULT_WINDOW_SIZE,
+ .hash_algo = RTE_COMP_HASH_ALGO_NONE
+ }
+ };
+
+ /* create stream */
+ rte_comp_stream_create(cdev_id, &compress_xform, &stream);
+
+ /* create an op pool and allocate ops */
+ rte_comp_op_bulk_alloc(op_pool, comp_ops, NUM_CHUNKS);
+
+ /* Prepare source and destination mbufs for compression operations */
+ unsigned int i;
+ for (i = 0; i < NUM_CHUNKS; i++) {
+ if (rte_pktmbuf_append(mbufs[i], CHUNK_LEN) == NULL)
+ rte_exit(EXIT_FAILURE, "Not enough room in the mbuf\n");
+ comp_ops[i]->m_src = mbufs[i];
+ if (rte_pktmbuf_append(dst_mbufs[i], CHUNK_LEN) == NULL)
+ rte_exit(EXIT_FAILURE, "Not enough room in the mbuf\n");
+ comp_ops[i]->m_dst = dst_mbufs[i];
+ }
+
+ /* Set up the compress operations. */
+ for (i = 0; i < NUM_CHUNKS; i++) {
+ struct rte_comp_op *op = comp_ops[i];
+ op->stream = stream;
+ op->m_src = src_buf[i];
+ op->m_dst = dst_buf[i];
+ op->type = RTE_COMP_OP_STATEFUL;
+ if(i == NUM_CHUNKS-1) {
+ /* set to final, if last chunk*/
+ op->flush = RTE_COMP_FLUSH_FINAL;
+ } else {
+ /* set to NONE, for all intermediary ops */
+ op->flush = RTE_COMP_FLUSH_NONE;
+ }
+ op->src.offset = 0;
+ op->dst.offset = 0;
+ op->src.length = CHUNK_LEN;
+ op->input_chksum = 0;
+ num_enqd = rte_compressdev_enqueue_burst(cdev_id, 0, &op[i], 1);
+ /* wait for this to complete before enqueing next*/
+ do {
+ num_deqd = rte_compressdev_dequeue_burst(cdev_id, 0 , &processed_ops, 1);
+ } while (num_deqd < num_enqd);
+ /* push next op*/
+ }
+
+
+Stateful and OUT_OF_SPACE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If PMD supports stateful operation, then OUT_OF_SPACE status is not an actual
+error for the PMD. In such case, PMD returns with status
+RTE_COMP_OP_STATUS_OUT_OF_SPACE_RECOVERABLE with consumed = number of input bytes
+read and produced = length of complete output buffer.
+Application should enqueue next op with source starting at consumed+1 and an
+output buffer with available space.
+
+Hash in Stateful
+~~~~~~~~~~~~~~~~
+If enabled, digest buffer will contain valid digest after last op in stream
+(having flush = RTE_COMP_OP_FLUSH_FINAL) is successfully processed i.e. dequeued
+with status = RTE_COMP_OP_STATUS_SUCCESS.
+
+Checksum in Stateful
+~~~~~~~~~~~~~~~~~~~~
+If enabled, checksum will only be available after last op in stream
+(having flush = RTE_COMP_OP_FLUSH_FINAL) is successfully processed i.e. dequeued
+with status = RTE_COMP_OP_STATUS_SUCCESS.
+
+Burst in compression API
+-------------------------
+
+Scheduling of compression operations on DPDK's application data path is
+performed using a burst oriented asynchronous API set. A queue pair on a compression
+device accepts a burst of compression operations using enqueue burst API. On physical
+devices the enqueue burst API will place the operations to be processed
+on the device's hardware input queue, for virtual devices the processing of the
+operations is usually completed during the enqueue call to the compression
+device. The dequeue burst API will retrieve any processed operations available
+from the queue pair on the compression device, from physical devices this is usually
+directly from the devices processed queue, and for virtual device's from a
+``rte_ring`` where processed operations are place after being processed on the
+enqueue call.
+
+A burst in DPDK compression can be a combination of stateless and stateful operations with a condition
+that for stateful ops only one op at-a-time should be enqueued from a particular stream i.e. no-two ops
+should belong to same stream in a single burst. However a burst may contain multiple stateful ops as long
+as each op is attached to a different stream i.e. a burst can look like:
+
++---------------+--------------+--------------+-----------------+--------------+--------------+
+| enqueue_burst | op1.no_flush | op2.no_flush | op3.flush_final | op4.no_flush | op5.no_flush |
++---------------+--------------+--------------+-----------------+--------------+--------------+
+
+Where, op1 .. op5 all belong to different independent data units. op1, op2, op4, op5 must be stateful
+as stateless ops can only use flush full or final and op3 can be of type stateless or stateful.
+Every op with type set to RTE_COMP_OP_TYPE_STATELESS must be attached to priv_xform and
+Every op with type set to RTE_COMP_OP_TYPE_STATEFUL *must* be attached to stream.
+
+Since each operation in a burst is independent and thus can be completed
+out-of-order, applications which need ordering, should setup per-op user data
+area with reordering information so that it can determine enqueue order at
+dequeue.
+
+Also if multiple threads calls enqueue_burst() on same queue pair then it’s
+application onus to use proper locking mechanism to ensure exclusive enqueuing
+of operations.
+
+Enqueue / Dequeue Burst APIs
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The burst enqueue API uses a compression device identifier and a queue pair
+identifier to specify the compression device queue pair to schedule the processing on.
+The ``nb_ops`` parameter is the number of operations to process which are
+supplied in the ``ops`` array of ``rte_comp_op`` structures.
+The enqueue function returns the number of operations it actually enqueued for
+processing, a return value equal to ``nb_ops`` means that all packets have been
+enqueued.
+
+The dequeue API uses the same format as the enqueue API but
+the ``nb_ops`` and ``ops`` parameters are now used to specify the max processed
+operations the user wishes to retrieve and the location in which to store them.
+The API call returns the actual number of processed operations returned, this
+can never be larger than ``nb_ops``.
+
+Sample code
+-----------
+
+There are unit test applications that show how to use the compressdev library inside
+test/test/test_compressdev.c
+
+Compression Device API
+~~~~~~~~~~~~~~~~~~~~~~
+
+The compressdev Library API is described in the *DPDK API Reference* document.
--- /dev/null
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git.droids-corp.org / dpdk.git / commitdiff
