1.. SPDX-License-Identifier: BSD-3-Clause 2 Copyright(c) 2018 Intel Corporation. 3 4Intel(R) QuickAssist (QAT) Compression Poll Mode Driver 5======================================================= 6 7The QAT compression PMD provides poll mode compression & decompression driver 8support for the following hardware accelerator devices: 9 10* ``Intel QuickAssist Technology C62x`` 11* ``Intel QuickAssist Technology C3xxx`` 12* ``Intel QuickAssist Technology DH895x`` 13* ``Intel QuickAssist Technology 300xx`` 14 15 16Features 17-------- 18 19QAT compression PMD has support for: 20 21Compression/Decompression algorithm: 22 23 * DEFLATE - using Fixed and Dynamic Huffman encoding 24 25Window size support: 26 27 * 32K 28 29Checksum generation: 30 31 * CRC32, Adler and combined checksum 32 33Stateful operation: 34 35 * Decompression only 36 37Limitations 38----------- 39 40* Compressdev level 0, no compression, is not supported. 41* Queue-pairs are thread-safe on Intel CPUs but Queues are not (that is, within a single 42 queue-pair all enqueues to the TX queue must be done from one thread and all dequeues 43 from the RX queue must be done from one thread, but enqueues and dequeues may be done 44 in different threads.) 45* No BSD support as BSD QAT kernel driver not available. 46* Stateful compression is not supported. 47 48 49Installation 50------------ 51 52The QAT compression PMD is built by default with a standard DPDK build. 53 54It depends on a QAT kernel driver, see :ref:`building_qat`. 55