ceph/src/spdk/dpdk/lib/librte_acl/rte_acl.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #ifndef _RTE_ACL_H_
   6 #define _RTE_ACL_H_
   7
   8 /**
   9  * @file
  10  *
  11  * RTE Classifier.
  12  */
  13
  14 #include <rte_acl_osdep.h>
  15
  16 #ifdef __cplusplus
  17 extern "C" {
  18 #endif
  19
  20 #define RTE_ACL_MAX_CATEGORIES  16
  21
  22 #define RTE_ACL_RESULTS_MULTIPLIER      (XMM_SIZE / sizeof(uint32_t))
  23
  24 #define RTE_ACL_MAX_LEVELS 64
  25 #define RTE_ACL_MAX_FIELDS 64
  26
  27 union rte_acl_field_types {
  28         uint8_t  u8;
  29         uint16_t u16;
  30         uint32_t u32;
  31         uint64_t u64;
  32 };
  33
  34 enum {
  35         RTE_ACL_FIELD_TYPE_MASK = 0,
  36         RTE_ACL_FIELD_TYPE_RANGE,
  37         RTE_ACL_FIELD_TYPE_BITMASK
  38 };
  39
  40 /**
  41  * ACL Field definition.
  42  * Each field in the ACL rule has an associate definition.
  43  * It defines the type of field, its size, its offset in the input buffer,
  44  * the field index, and the input index.
  45  * For performance reasons, the inner loop of the search function is unrolled
  46  * to process four input bytes at a time. This requires the input to be grouped
  47  * into sets of 4 consecutive bytes. The loop processes the first input byte as
  48  * part of the setup and then subsequent bytes must be in groups of 4
  49  * consecutive bytes.
  50  */
  51 struct rte_acl_field_def {
  52         uint8_t  type;        /**< type - RTE_ACL_FIELD_TYPE_*. */
  53         uint8_t  size;        /**< size of field 1,2,4, or 8. */
  54         uint8_t  field_index; /**< index of field inside the rule. */
  55         uint8_t  input_index; /**< 0-N input index. */
  56         uint32_t offset;      /**< offset to start of field. */
  57 };
  58
  59 /**
  60  * ACL build configuration.
  61  * Defines the fields of an ACL trie and number of categories to build with.
  62  */
  63 struct rte_acl_config {
  64         uint32_t num_categories; /**< Number of categories to build with. */
  65         uint32_t num_fields;     /**< Number of field definitions. */
  66         struct rte_acl_field_def defs[RTE_ACL_MAX_FIELDS];
  67         /**< array of field definitions. */
  68         size_t max_size;
  69         /**< max memory limit for internal run-time structures. */
  70 };
  71
  72 /**
  73  * Defines the value of a field for a rule.
  74  */
  75 struct rte_acl_field {
  76         union rte_acl_field_types value;
  77         /**< a 1,2,4, or 8 byte value of the field. */
  78         union rte_acl_field_types mask_range;
  79         /**<
  80          * depending on field type:
  81          * mask -> 1.2.3.4/32 value=0x1020304, mask_range=32,
  82          * range -> 0 : 65535 value=0, mask_range=65535,
  83          * bitmask -> 0x06/0xff value=6, mask_range=0xff.
  84          */
  85 };
  86
  87 enum {
  88         RTE_ACL_TYPE_SHIFT = 29,
  89         RTE_ACL_MAX_INDEX = RTE_LEN2MASK(RTE_ACL_TYPE_SHIFT, uint32_t),
  90         RTE_ACL_MAX_PRIORITY = RTE_ACL_MAX_INDEX,
  91         RTE_ACL_MIN_PRIORITY = 0,
  92 };
  93
  94 #define RTE_ACL_MASKLEN_TO_BITMASK(v, s)        \
  95 ((v) == 0 ? (v) : (typeof(v))((uint64_t)-1 << ((s) * CHAR_BIT - (v))))
  96
  97 /**
  98  * Miscellaneous data for ACL rule.
  99  */
 100 struct rte_acl_rule_data {
 101         uint32_t category_mask; /**< Mask of categories for that rule. */
 102         int32_t  priority;      /**< Priority for that rule. */
 103         uint32_t userdata;      /**< Associated with the rule user data. */
 104 };
 105
 106 /**
 107  * Defines single ACL rule.
 108  * data - miscellaneous data for the rule.
 109  * field[] - value and mask or range for each field.
 110  */
 111 #define RTE_ACL_RULE_DEF(name, fld_num) struct name {\
 112         struct rte_acl_rule_data data;               \
 113         struct rte_acl_field field[fld_num];         \
 114 }
 115
 116 RTE_ACL_RULE_DEF(rte_acl_rule,);
 117
 118 #define RTE_ACL_RULE_SZ(fld_num)        \
 119         (sizeof(struct rte_acl_rule) + sizeof(struct rte_acl_field) * (fld_num))
 120
 121
 122 /** Max number of characters in name.*/
 123 #define RTE_ACL_NAMESIZE                32
 124
 125 /**
 126  * Parameters used when creating the ACL context.
 127  */
 128 struct rte_acl_param {
 129         const char *name;         /**< Name of the ACL context. */
 130         int         socket_id;    /**< Socket ID to allocate memory for. */
 131         uint32_t    rule_size;    /**< Size of each rule. */
 132         uint32_t    max_rule_num; /**< Maximum number of rules. */
 133 };
 134
 135
 136 /**
 137  * Create a new ACL context.
 138  *
 139  * @param param
 140  *   Parameters used to create and initialise the ACL context.
 141  * @return
 142  *   Pointer to ACL context structure that is used in future ACL
 143  *   operations, or NULL on error, with error code set in rte_errno.
 144  *   Possible rte_errno errors include:
 145  *   - EINVAL - invalid parameter passed to function
 146  */
 147 struct rte_acl_ctx *
 148 rte_acl_create(const struct rte_acl_param *param);
 149
 150 /**
 151  * Find an existing ACL context object and return a pointer to it.
 152  *
 153  * @param name
 154  *   Name of the ACL context as passed to rte_acl_create()
 155  * @return
 156  *   Pointer to ACL context or NULL if object not found
 157  *   with rte_errno set appropriately. Possible rte_errno values include:
 158  *    - ENOENT - value not available for return
 159  */
 160 struct rte_acl_ctx *
 161 rte_acl_find_existing(const char *name);
 162
 163 /**
 164  * De-allocate all memory used by ACL context.
 165  *
 166  * @param ctx
 167  *   ACL context to free
 168  */
 169 void
 170 rte_acl_free(struct rte_acl_ctx *ctx);
 171
 172 /**
 173  * Add rules to an existing ACL context.
 174  * This function is not multi-thread safe.
 175  *
 176  * @param ctx
 177  *   ACL context to add patterns to.
 178  * @param rules
 179  *   Array of rules to add to the ACL context.
 180  *   Note that all fields in rte_acl_rule structures are expected
 181  *   to be in host byte order.
 182  *   Each rule expected to be in the same format and not exceed size
 183  *   specified at ACL context creation time.
 184  * @param num
 185  *   Number of elements in the input array of rules.
 186  * @return
 187  *   - -ENOMEM if there is no space in the ACL context for these rules.
 188  *   - -EINVAL if the parameters are invalid.
 189  *   - Zero if operation completed successfully.
 190  */
 191 int
 192 rte_acl_add_rules(struct rte_acl_ctx *ctx, const struct rte_acl_rule *rules,
 193         uint32_t num);
 194
 195 /**
 196  * Delete all rules from the ACL context.
 197  * This function is not multi-thread safe.
 198  * Note that internal run-time structures are not affected.
 199  *
 200  * @param ctx
 201  *   ACL context to delete rules from.
 202  */
 203 void
 204 rte_acl_reset_rules(struct rte_acl_ctx *ctx);
 205
 206 /**
 207  * Analyze set of rules and build required internal run-time structures.
 208  * This function is not multi-thread safe.
 209  *
 210  * @param ctx
 211  *   ACL context to build.
 212  * @param cfg
 213  *   Pointer to struct rte_acl_config - defines build parameters.
 214  * @return
 215  *   - -ENOMEM if couldn't allocate enough memory.
 216  *   - -EINVAL if the parameters are invalid.
 217  *   - Negative error code if operation failed.
 218  *   - Zero if operation completed successfully.
 219  */
 220 int
 221 rte_acl_build(struct rte_acl_ctx *ctx, const struct rte_acl_config *cfg);
 222
 223 /**
 224  * Delete all rules from the ACL context and
 225  * destroy all internal run-time structures.
 226  * This function is not multi-thread safe.
 227  *
 228  * @param ctx
 229  *   ACL context to reset.
 230  */
 231 void
 232 rte_acl_reset(struct rte_acl_ctx *ctx);
 233
 234 /**
 235  *  Available implementations of ACL classify.
 236  */
 237 enum rte_acl_classify_alg {
 238         RTE_ACL_CLASSIFY_DEFAULT = 0,
 239         RTE_ACL_CLASSIFY_SCALAR = 1,  /**< generic implementation. */
 240         RTE_ACL_CLASSIFY_SSE = 2,     /**< requires SSE4.1 support. */
 241         RTE_ACL_CLASSIFY_AVX2 = 3,    /**< requires AVX2 support. */
 242         RTE_ACL_CLASSIFY_NEON = 4,    /**< requires NEON support. */
 243         RTE_ACL_CLASSIFY_ALTIVEC = 5,    /**< requires ALTIVEC support. */
 244         RTE_ACL_CLASSIFY_NUM          /* should always be the last one. */
 245 };
 246
 247 /**
 248  * Perform search for a matching ACL rule for each input data buffer.
 249  * Each input data buffer can have up to *categories* matches.
 250  * That implies that results array should be big enough to hold
 251  * (categories * num) elements.
 252  * Also categories parameter should be either one or multiple of
 253  * RTE_ACL_RESULTS_MULTIPLIER and can't be bigger than RTE_ACL_MAX_CATEGORIES.
 254  * If more than one rule is applicable for given input buffer and
 255  * given category, then rule with highest priority will be returned as a match.
 256  * Note, that it is a caller's responsibility to ensure that input parameters
 257  * are valid and point to correct memory locations.
 258  *
 259  * @param ctx
 260  *   ACL context to search with.
 261  * @param data
 262  *   Array of pointers to input data buffers to perform search.
 263  *   Note that all fields in input data buffers supposed to be in network
 264  *   byte order (MSB).
 265  * @param results
 266  *   Array of search results, *categories* results per each input data buffer.
 267  * @param num
 268  *   Number of elements in the input data buffers array.
 269  * @param categories
 270  *   Number of maximum possible matches for each input buffer, one possible
 271  *   match per category.
 272  * @return
 273  *   zero on successful completion.
 274  *   -EINVAL for incorrect arguments.
 275  */
 276 extern int
 277 rte_acl_classify(const struct rte_acl_ctx *ctx,
 278                  const uint8_t **data,
 279                  uint32_t *results, uint32_t num,
 280                  uint32_t categories);
 281
 282 /**
 283  * Perform search using specified algorithm for a matching ACL rule for
 284  * each input data buffer.
 285  * Each input data buffer can have up to *categories* matches.
 286  * That implies that results array should be big enough to hold
 287  * (categories * num) elements.
 288  * Also categories parameter should be either one or multiple of
 289  * RTE_ACL_RESULTS_MULTIPLIER and can't be bigger than RTE_ACL_MAX_CATEGORIES.
 290  * If more than one rule is applicable for given input buffer and
 291  * given category, then rule with highest priority will be returned as a match.
 292  * Note, that it is a caller's responsibility to ensure that input parameters
 293  * are valid and point to correct memory locations.
 294  *
 295  * @param ctx
 296  *   ACL context to search with.
 297  * @param data
 298  *   Array of pointers to input data buffers to perform search.
 299  *   Note that all fields in input data buffers supposed to be in network
 300  *   byte order (MSB).
 301  * @param results
 302  *   Array of search results, *categories* results per each input data buffer.
 303  * @param num
 304  *   Number of elements in the input data buffers array.
 305  * @param categories
 306  *   Number of maximum possible matches for each input buffer, one possible
 307  *   match per category.
 308  * @param alg
 309  *   Algorithm to be used for the search.
 310  *   It is the caller responsibility to ensure that the value refers to the
 311  *   existing algorithm, and that it could be run on the given CPU.
 312  * @return
 313  *   zero on successful completion.
 314  *   -EINVAL for incorrect arguments.
 315  */
 316 extern int
 317 rte_acl_classify_alg(const struct rte_acl_ctx *ctx,
 318                  const uint8_t **data,
 319                  uint32_t *results, uint32_t num,
 320                  uint32_t categories,
 321                  enum rte_acl_classify_alg alg);
 322
 323 /*
 324  * Override the default classifier function for a given ACL context.
 325  * @param ctx
 326  *   ACL context to change classify function for.
 327  * @param alg
 328  *   New default classify algorithm for given ACL context.
 329  *   It is the caller responsibility to ensure that the value refers to the
 330  *   existing algorithm, and that it could be run on the given CPU.
 331  * @return
 332  *   - -EINVAL if the parameters are invalid.
 333  *   - Zero if operation completed successfully.
 334  */
 335 extern int
 336 rte_acl_set_ctx_classify(struct rte_acl_ctx *ctx,
 337         enum rte_acl_classify_alg alg);
 338
 339 /**
 340  * Dump an ACL context structure to the console.
 341  *
 342  * @param ctx
 343  *   ACL context to dump.
 344  */
 345 void
 346 rte_acl_dump(const struct rte_acl_ctx *ctx);
 347
 348 /**
 349  * Dump all ACL context structures to the console.
 350  */
 351 void
 352 rte_acl_list_dump(void);
 353
 354 #ifdef __cplusplus
 355 }
 356 #endif
 357
 358 #endif /* _RTE_ACL_H_ */