1.. SPDX-License-Identifier: BSD-3-Clause 2 Copyright 2020 Mellanox Technologies, Ltd 3 4RegEx Device Library 5==================== 6 7The RegEx library provides a RegEx device framework for management and 8provisioning of hardware and software RegEx poll mode drivers, defining generic 9APIs which support a number of different RegEx operations. 10 11 12Design Principles 13----------------- 14 15The RegEx library follows the same basic principles as those used in DPDK's 16Ethernet Device framework and the Crypto framework. The RegEx framework provides 17a generic Crypto device framework which supports both physical (hardware) 18and virtual (software) RegEx devices as well as a generic RegEx API which allows 19RegEx devices to be managed and configured and supports RegEx operations to be 20provisioned on RegEx poll mode driver. 21 22 23Device Management 24----------------- 25 26Device Creation 27~~~~~~~~~~~~~~~ 28 29Physical RegEx devices are discovered during the PCI probe/enumeration of the 30EAL function which is executed at DPDK initialization, based on 31their PCI device identifier, each unique PCI BDF (bus/bridge, device, 32function). Specific physical ReEx devices, like other physical devices in DPDK 33can be white-listed or black-listed using the EAL command line options. 34 35 36Device Identification 37~~~~~~~~~~~~~~~~~~~~~ 38 39Each device, whether virtual or physical is uniquely designated by two 40identifiers: 41 42- A unique device index used to designate the RegEx device in all functions 43 exported by the regexdev API. 44 45- A device name used to designate the RegEx device in console messages, for 46 administration or debugging purposes. 47 48 49Device Configuration 50~~~~~~~~~~~~~~~~~~~~ 51 52The configuration of each RegEx device includes the following operations: 53 54- Allocation of resources, including hardware resources if a physical device. 55- Resetting the device into a well-known default state. 56- Initialization of statistics counters. 57 58The rte_regexdev_configure API is used to configure a RegEx device. 59 60.. code-block:: c 61 62 int rte_regexdev_configure(uint8_t dev_id, 63 const struct rte_regexdev_config *cfg); 64 65The ``rte_regexdev_config`` structure is used to pass the configuration 66parameters for the RegEx device for example number of queue pairs, number of 67groups, max number of matches and so on. 68 69.. code-block:: c 70 71 struct rte_regexdev_config { 72 uint16_t nb_max_matches; 73 /**< Maximum matches per scan configured on this device. 74 * This value cannot exceed the *max_matches* 75 * which previously provided in rte_regexdev_info_get(). 76 * The value 0 is allowed, in which case, value 1 used. 77 * @see struct rte_regexdev_info::max_matches 78 */ 79 uint16_t nb_queue_pairs; 80 /**< Number of RegEx queue pairs to configure on this device. 81 * This value cannot exceed the *max_queue_pairs* which previously 82 * provided in rte_regexdev_info_get(). 83 * @see struct rte_regexdev_info::max_queue_pairs 84 */ 85 uint32_t nb_rules_per_group; 86 /**< Number of rules per group to configure on this device. 87 * This value cannot exceed the *max_rules_per_group* 88 * which previously provided in rte_regexdev_info_get(). 89 * The value 0 is allowed, in which case, 90 * struct rte_regexdev_info::max_rules_per_group used. 91 * @see struct rte_regexdev_info::max_rules_per_group 92 */ 93 uint16_t nb_groups; 94 /**< Number of groups to configure on this device. 95 * This value cannot exceed the *max_groups* 96 * which previously provided in rte_regexdev_info_get(). 97 * @see struct rte_regexdev_info::max_groups 98 */ 99 const char *rule_db; 100 /**< Import initial set of prebuilt rule database on this device. 101 * The value NULL is allowed, in which case, the device will not 102 * be configured prebuilt rule database. Application may use 103 * rte_regexdev_rule_db_update() or rte_regexdev_rule_db_import() API 104 * to update or import rule database after the 105 * rte_regexdev_configure(). 106 * @see rte_regexdev_rule_db_update(), rte_regexdev_rule_db_import() 107 */ 108 uint32_t rule_db_len; 109 /**< Length of *rule_db* buffer. */ 110 uint32_t dev_cfg_flags; 111 /**< RegEx device configuration flags, See RTE_REGEXDEV_CFG_* */ 112 }; 113 114 115Configuration of Rules Database 116~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 117 118Each Regex device should be configured with the rule database. 119There are two modes of setting the rule database, online or offline. 120The online mode means, that the rule database in being compiled by the 121RegEx PMD while in the offline mode the rule database is compiled by external 122compiler, and is being loaded to the PMD as a buffer. 123The configuration mode is depended on the PMD capabilities. 124 125Online rule configuration is done using the following API functions: 126``rte_regexdev_rule_db_update`` which add / remove rules from the rules 127precomplied list, and ``rte_regexdev_rule_db_compile_activate`` 128which compile the rules and loads them to the RegEx HW. 129 130Offline rule configuration can be done by adding a pointer to the compiled 131rule database in the configuration step, or by using 132``rte_regexdev_rule_db_import`` API. 133 134 135Configuration of Queue Pairs 136~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 137 138Each RegEx device can be configured with number of queue pairs. 139Each queue pair is configured using ``rte_regexdev_queue_pair_setup`` 140 141 142Logical Cores, Memory and Queues Pair Relationships 143~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 144 145Multiple logical cores should never share the same queue pair for enqueuing 146operations or dequeuing operations on the same RegEx device since this would 147require global locks and hinder performance. 148 149 150Device Features and Capabilities 151--------------------------------- 152 153RegEx devices may support different feature set. 154In order to get the supported PMD feature ``rte_regexdev_info_get`` 155API which return the info of the device and it's supported features. 156 157 158Enqueue / Dequeue Burst APIs 159~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 160 161The burst enqueue API uses a RegEx device identifier and a queue pair 162identifier to specify the device queue pair to schedule the processing on. 163The ``nb_ops`` parameter is the number of operations to process which are 164supplied in the ``ops`` array of ``rte_regex_ops`` structures. 165The enqueue function returns the number of operations it actually enqueued for 166processing, a return value equal to ``nb_ops`` means that all packets have been 167enqueued. 168 169Data pointed in each op, should not be released until the dequeue of for that 170op. 171 172The dequeue API uses the same format as the enqueue API of processed but 173the ``nb_ops`` and ``ops`` parameters are now used to specify the max processed 174operations the user wishes to retrieve and the location in which to store them. 175The API call returns the actual number of processed operations returned, this 176can never be larger than ``nb_ops``. 177 178