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sys/contrib/dpdk_rte_lpm/rte_lpm.c
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1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2010-2014 Intel Corporation 3 */ 4 5 #include <sys/param.h> 6 #include <sys/ctype.h> 7 #include <sys/systm.h> 8 #include <sys/lock.h> 9 #include <sys/rwlock.h> 10 #include <sys/malloc.h> 11 #include <sys/mbuf.h> 12 #include <sys/socket.h> 13 #include <sys/kernel.h> 14 15 int errno = 0, rte_errno = 0; 16 17 #if 0 18 #include <string.h> 19 #include <stdint.h> 20 #include <errno.h> 21 #include <stdarg.h> 22 #include <stdio.h> 23 #include <sys/queue.h> 24 25 #include <rte_log.h> 26 #include <rte_branch_prediction.h> 27 #include <rte_common.h> 28 #include <rte_memory.h> /* for definition of RTE_CACHE_LINE_SIZE */ 29 #include <rte_malloc.h> 30 #include <rte_eal.h> 31 #include <rte_eal_memconfig.h> 32 #include <rte_per_lcore.h> 33 #include <rte_string_fns.h> 34 #include <rte_errno.h> 35 #include <rte_rwlock.h> 36 #include <rte_spinlock.h> 37 #include <rte_tailq.h> 38 #endif 39 40 #include "rte_shim.h" 41 #include "rte_lpm.h" 42 43 #if 0 44 TAILQ_HEAD(rte_lpm_list, rte_tailq_entry); 45 46 static struct rte_tailq_elem rte_lpm_tailq = { 47 .name = "RTE_LPM", 48 }; 49 EAL_REGISTER_TAILQ(rte_lpm_tailq) 50 #endif 51 52 #define MAX_DEPTH_TBL24 24 53 54 enum valid_flag { 55 INVALID = 0, 56 VALID 57 }; 58 59 /* Macro to enable/disable run-time checks. */ 60 #if defined(RTE_LIBRTE_LPM_DEBUG) 61 #include <rte_debug.h> 62 #define VERIFY_DEPTH(depth) do { \ 63 if ((depth == 0) || (depth > RTE_LPM_MAX_DEPTH)) \ 64 rte_panic("LPM: Invalid depth (%u) at line %d", \ 65 (unsigned)(depth), __LINE__); \ 66 } while (0) 67 #else 68 #define VERIFY_DEPTH(depth) 69 #endif 70 71 /* 72 * Converts a given depth value to its corresponding mask value. 73 * 74 * depth (IN) : range = 1 - 32 75 * mask (OUT) : 32bit mask 76 */ 77 static uint32_t __attribute__((pure)) 78 depth_to_mask(uint8_t depth) 79 { 80 VERIFY_DEPTH(depth); 81 82 /* To calculate a mask start with a 1 on the left hand side and right 83 * shift while populating the left hand side with 1's 84 */ 85 return (int)0x80000000 >> (depth - 1); 86 } 87 88 /* 89 * Converts given depth value to its corresponding range value. 90 */ 91 static uint32_t __attribute__((pure)) 92 depth_to_range(uint8_t depth) 93 { 94 VERIFY_DEPTH(depth); 95 96 /* 97 * Calculate tbl24 range. (Note: 2^depth = 1 << depth) 98 */ 99 if (depth <= MAX_DEPTH_TBL24) 100 return 1 << (MAX_DEPTH_TBL24 - depth); 101 102 /* Else if depth is greater than 24 */ 103 return 1 << (RTE_LPM_MAX_DEPTH - depth); 104 } 105 106 #if 0 107 /* 108 * Find an existing lpm table and return a pointer to it. 109 */ 110 struct rte_lpm * 111 rte_lpm_find_existing(const char *name) 112 { 113 struct rte_lpm *l = NULL; 114 struct rte_tailq_entry *te; 115 struct rte_lpm_list *lpm_list; 116 117 lpm_list = RTE_TAILQ_CAST(rte_lpm_tailq.head, rte_lpm_list); 118 119 rte_mcfg_tailq_read_lock(); 120 TAILQ_FOREACH(te, lpm_list, next) { 121 l = te->data; 122 if (strncmp(name, l->name, RTE_LPM_NAMESIZE) == 0) 123 break; 124 } 125 rte_mcfg_tailq_read_unlock(); 126 127 if (te == NULL) { 128 rte_errno = ENOENT; 129 return NULL; 130 } 131 132 return l; 133 } 134 #endif 135 136 /* 137 * Allocates memory for LPM object 138 */ 139 struct rte_lpm * 140 rte_lpm_create(const char *name, int socket_id, 141 const struct rte_lpm_config *config) 142 { 143 char mem_name[RTE_LPM_NAMESIZE]; 144 struct rte_lpm *lpm = NULL; 145 //struct rte_tailq_entry *te; 146 uint32_t mem_size, rules_size, tbl8s_size; 147 //struct rte_lpm_list *lpm_list; 148 149 //lpm_list = RTE_TAILQ_CAST(rte_lpm_tailq.head, rte_lpm_list); 150 151 RTE_BUILD_BUG_ON(sizeof(struct rte_lpm_tbl_entry) != 4); 152 153 /* Check user arguments. */ 154 if ((name == NULL) || (socket_id < -1) 155 || config->number_tbl8s > RTE_LPM_MAX_TBL8_NUM_GROUPS) { 156 rte_errno = EINVAL; 157 return NULL; 158 } 159 160 snprintf(mem_name, sizeof(mem_name), "LPM_%s", name); 161 162 /* Determine the amount of memory to allocate. */ 163 mem_size = sizeof(*lpm); 164 rules_size = sizeof(struct rte_lpm_rule) * config->max_rules; 165 tbl8s_size = (sizeof(struct rte_lpm_tbl_entry) * 166 RTE_LPM_TBL8_GROUP_NUM_ENTRIES * config->number_tbl8s); 167 168 #if 0 169 rte_mcfg_tailq_write_lock(); 170 171 /* guarantee there's no existing */ 172 TAILQ_FOREACH(te, lpm_list, next) { 173 lpm = te->data; 174 if (strncmp(name, lpm->name, RTE_LPM_NAMESIZE) == 0) 175 break; 176 } 177 178 if (te != NULL) { 179 lpm = NULL; 180 rte_errno = EEXIST; 181 goto exit; 182 } 183 184 /* allocate tailq entry */ 185 te = rte_zmalloc("LPM_TAILQ_ENTRY", sizeof(*te), 0); 186 if (te == NULL) { 187 RTE_LOG(ERR, LPM, "Failed to allocate tailq entry\n"); 188 rte_errno = ENOMEM; 189 goto exit; 190 } 191 #endif 192 193 /* Allocate memory to store the LPM data structures. */ 194 lpm = rte_zmalloc_socket(mem_name, mem_size, 195 RTE_CACHE_LINE_SIZE, socket_id); 196 if (lpm == NULL) { 197 RTE_LOG(ERR, LPM, "LPM memory allocation failed\n"); 198 //rte_free(te); 199 rte_errno = ENOMEM; 200 goto exit; 201 } 202 203 lpm->rules_tbl = rte_zmalloc_socket(NULL, 204 (size_t)rules_size, RTE_CACHE_LINE_SIZE, socket_id); 205 206 if (lpm->rules_tbl == NULL) { 207 RTE_LOG(ERR, LPM, "LPM rules_tbl memory allocation failed\n"); 208 rte_free(lpm); 209 lpm = NULL; 210 //rte_free(te); 211 rte_errno = ENOMEM; 212 goto exit; 213 } 214 215 lpm->tbl8 = rte_zmalloc_socket(NULL, 216 (size_t)tbl8s_size, RTE_CACHE_LINE_SIZE, socket_id); 217 218 if (lpm->tbl8 == NULL) { 219 RTE_LOG(ERR, LPM, "LPM tbl8 memory allocation failed\n"); 220 rte_free(lpm->rules_tbl); 221 rte_free(lpm); 222 lpm = NULL; 223 //rte_free(te); 224 rte_errno = ENOMEM; 225 goto exit; 226 } 227 228 /* Save user arguments. */ 229 lpm->max_rules = config->max_rules; 230 lpm->number_tbl8s = config->number_tbl8s; 231 strlcpy(lpm->name, name, sizeof(lpm->name)); 232 233 //te->data = lpm; 234 235 //TAILQ_INSERT_TAIL(lpm_list, te, next); 236 237 exit: 238 rte_mcfg_tailq_write_unlock(); 239 240 return lpm; 241 } 242 243 /* 244 * Deallocates memory for given LPM table. 245 */ 246 void 247 rte_lpm_free(struct rte_lpm *lpm) 248 { 249 #if 0 250 struct rte_lpm_list *lpm_list; 251 struct rte_tailq_entry *te; 252 253 /* Check user arguments. */ 254 if (lpm == NULL) 255 return; 256 257 lpm_list = RTE_TAILQ_CAST(rte_lpm_tailq.head, rte_lpm_list); 258 259 rte_mcfg_tailq_write_lock(); 260 261 /* find our tailq entry */ 262 TAILQ_FOREACH(te, lpm_list, next) { 263 if (te->data == (void *) lpm) 264 break; 265 } 266 if (te != NULL) 267 TAILQ_REMOVE(lpm_list, te, next); 268 269 rte_mcfg_tailq_write_unlock(); 270 #endif 271 272 rte_free(lpm->tbl8); 273 rte_free(lpm->rules_tbl); 274 rte_free(lpm); 275 //rte_free(te); 276 } 277 278 #if 0 279 /* 280 * Adds a rule to the rule table. 281 * 282 * NOTE: The rule table is split into 32 groups. Each group contains rules that 283 * apply to a specific prefix depth (i.e. group 1 contains rules that apply to 284 * prefixes with a depth of 1 etc.). In the following code (depth - 1) is used 285 * to refer to depth 1 because even though the depth range is 1 - 32, depths 286 * are stored in the rule table from 0 - 31. 287 * NOTE: Valid range for depth parameter is 1 .. 32 inclusive. 288 */ 289 static int32_t 290 rule_add(struct rte_lpm *lpm, uint32_t ip_masked, uint8_t depth, 291 uint32_t next_hop) 292 { 293 uint32_t rule_gindex, rule_index, last_rule; 294 int i; 295 296 VERIFY_DEPTH(depth); 297 298 /* Scan through rule group to see if rule already exists. */ 299 if (lpm->rule_info[depth - 1].used_rules > 0) { 300 301 /* rule_gindex stands for rule group index. */ 302 rule_gindex = lpm->rule_info[depth - 1].first_rule; 303 /* Initialise rule_index to point to start of rule group. */ 304 rule_index = rule_gindex; 305 /* Last rule = Last used rule in this rule group. */ 306 last_rule = rule_gindex + lpm->rule_info[depth - 1].used_rules; 307 308 for (; rule_index < last_rule; rule_index++) { 309 310 /* If rule already exists update next hop and return. */ 311 if (lpm->rules_tbl[rule_index].ip == ip_masked) { 312 313 if (lpm->rules_tbl[rule_index].next_hop 314 == next_hop) 315 return -EEXIST; 316 lpm->rules_tbl[rule_index].next_hop = next_hop; 317 318 return rule_index; 319 } 320 } 321 322 if (rule_index == lpm->max_rules) 323 return -ENOSPC; 324 } else { 325 /* Calculate the position in which the rule will be stored. */ 326 rule_index = 0; 327 328 for (i = depth - 1; i > 0; i--) { 329 if (lpm->rule_info[i - 1].used_rules > 0) { 330 rule_index = lpm->rule_info[i - 1].first_rule 331 + lpm->rule_info[i - 1].used_rules; 332 break; 333 } 334 } 335 if (rule_index == lpm->max_rules) 336 return -ENOSPC; 337 338 lpm->rule_info[depth - 1].first_rule = rule_index; 339 } 340 341 /* Make room for the new rule in the array. */ 342 for (i = RTE_LPM_MAX_DEPTH; i > depth; i--) { 343 if (lpm->rule_info[i - 1].first_rule 344 + lpm->rule_info[i - 1].used_rules == lpm->max_rules) 345 return -ENOSPC; 346 347 if (lpm->rule_info[i - 1].used_rules > 0) { 348 lpm->rules_tbl[lpm->rule_info[i - 1].first_rule 349 + lpm->rule_info[i - 1].used_rules] 350 = lpm->rules_tbl[lpm->rule_info[i - 1].first_rule]; 351 lpm->rule_info[i - 1].first_rule++; 352 } 353 } 354 355 /* Add the new rule. */ 356 lpm->rules_tbl[rule_index].ip = ip_masked; 357 lpm->rules_tbl[rule_index].next_hop = next_hop; 358 359 /* Increment the used rules counter for this rule group. */ 360 lpm->rule_info[depth - 1].used_rules++; 361 362 return rule_index; 363 } 364 365 /* 366 * Delete a rule from the rule table. 367 * NOTE: Valid range for depth parameter is 1 .. 32 inclusive. 368 */ 369 static void 370 rule_delete(struct rte_lpm *lpm, int32_t rule_index, uint8_t depth) 371 { 372 int i; 373 374 VERIFY_DEPTH(depth); 375 376 lpm->rules_tbl[rule_index] = 377 lpm->rules_tbl[lpm->rule_info[depth - 1].first_rule 378 + lpm->rule_info[depth - 1].used_rules - 1]; 379 380 for (i = depth; i < RTE_LPM_MAX_DEPTH; i++) { 381 if (lpm->rule_info[i].used_rules > 0) { 382 lpm->rules_tbl[lpm->rule_info[i].first_rule - 1] = 383 lpm->rules_tbl[lpm->rule_info[i].first_rule 384 + lpm->rule_info[i].used_rules - 1]; 385 lpm->rule_info[i].first_rule--; 386 } 387 } 388 389 lpm->rule_info[depth - 1].used_rules--; 390 } 391 392 /* 393 * Finds a rule in rule table. 394 * NOTE: Valid range for depth parameter is 1 .. 32 inclusive. 395 */ 396 static int32_t 397 rule_find(struct rte_lpm *lpm, uint32_t ip_masked, uint8_t depth) 398 { 399 uint32_t rule_gindex, last_rule, rule_index; 400 401 VERIFY_DEPTH(depth); 402 403 rule_gindex = lpm->rule_info[depth - 1].first_rule; 404 last_rule = rule_gindex + lpm->rule_info[depth - 1].used_rules; 405 406 /* Scan used rules at given depth to find rule. */ 407 for (rule_index = rule_gindex; rule_index < last_rule; rule_index++) { 408 /* If rule is found return the rule index. */ 409 if (lpm->rules_tbl[rule_index].ip == ip_masked) 410 return rule_index; 411 } 412 413 /* If rule is not found return -EINVAL. */ 414 return -EINVAL; 415 } 416 #endif 417 418 /* 419 * Find, clean and allocate a tbl8. 420 */ 421 static int32_t 422 tbl8_alloc(struct rte_lpm_tbl_entry *tbl8, uint32_t number_tbl8s) 423 { 424 uint32_t group_idx; /* tbl8 group index. */ 425 struct rte_lpm_tbl_entry *tbl8_entry; 426 427 /* Scan through tbl8 to find a free (i.e. INVALID) tbl8 group. */ 428 for (group_idx = 0; group_idx < number_tbl8s; group_idx++) { 429 tbl8_entry = &tbl8[group_idx * RTE_LPM_TBL8_GROUP_NUM_ENTRIES]; 430 /* If a free tbl8 group is found clean it and set as VALID. */ 431 if (!tbl8_entry->valid_group) { 432 struct rte_lpm_tbl_entry new_tbl8_entry = { 433 .next_hop = 0, 434 .valid = INVALID, 435 .depth = 0, 436 .valid_group = VALID, 437 }; 438 439 memset(&tbl8_entry[0], 0, 440 RTE_LPM_TBL8_GROUP_NUM_ENTRIES * 441 sizeof(tbl8_entry[0])); 442 443 __atomic_store(tbl8_entry, &new_tbl8_entry, 444 __ATOMIC_RELAXED); 445 446 /* Return group index for allocated tbl8 group. */ 447 return group_idx; 448 } 449 } 450 451 /* If there are no tbl8 groups free then return error. */ 452 return -ENOSPC; 453 } 454 455 static void 456 tbl8_free(struct rte_lpm_tbl_entry *tbl8, uint32_t tbl8_group_start) 457 { 458 /* Set tbl8 group invalid*/ 459 struct rte_lpm_tbl_entry zero_tbl8_entry = {0}; 460 461 __atomic_store(&tbl8[tbl8_group_start], &zero_tbl8_entry, 462 __ATOMIC_RELAXED); 463 } 464 465 static __rte_noinline int32_t 466 add_depth_small(struct rte_lpm *lpm, uint32_t ip, uint8_t depth, 467 uint32_t next_hop) 468 { 469 #define group_idx next_hop 470 uint32_t tbl24_index, tbl24_range, tbl8_index, tbl8_group_end, i, j; 471 472 /* Calculate the index into Table24. */ 473 tbl24_index = ip >> 8; 474 tbl24_range = depth_to_range(depth); 475 476 for (i = tbl24_index; i < (tbl24_index + tbl24_range); i++) { 477 /* 478 * For invalid OR valid and non-extended tbl 24 entries set 479 * entry. 480 */ 481 if (!lpm->tbl24[i].valid || (lpm->tbl24[i].valid_group == 0 && 482 lpm->tbl24[i].depth <= depth)) { 483 484 struct rte_lpm_tbl_entry new_tbl24_entry = { 485 .next_hop = next_hop, 486 .valid = VALID, 487 .valid_group = 0, 488 .depth = depth, 489 }; 490 491 /* Setting tbl24 entry in one go to avoid race 492 * conditions 493 */ 494 __atomic_store(&lpm->tbl24[i], &new_tbl24_entry, 495 __ATOMIC_RELEASE); 496 497 continue; 498 } 499 500 if (lpm->tbl24[i].valid_group == 1) { 501 /* If tbl24 entry is valid and extended calculate the 502 * index into tbl8. 503 */ 504 tbl8_index = lpm->tbl24[i].group_idx * 505 RTE_LPM_TBL8_GROUP_NUM_ENTRIES; 506 tbl8_group_end = tbl8_index + 507 RTE_LPM_TBL8_GROUP_NUM_ENTRIES; 508 509 for (j = tbl8_index; j < tbl8_group_end; j++) { 510 if (!lpm->tbl8[j].valid || 511 lpm->tbl8[j].depth <= depth) { 512 struct rte_lpm_tbl_entry 513 new_tbl8_entry = { 514 .valid = VALID, 515 .valid_group = VALID, 516 .depth = depth, 517 .next_hop = next_hop, 518 }; 519 520 /* 521 * Setting tbl8 entry in one go to avoid 522 * race conditions 523 */ 524 __atomic_store(&lpm->tbl8[j], 525 &new_tbl8_entry, 526 __ATOMIC_RELAXED); 527 528 continue; 529 } 530 } 531 } 532 } 533 #undef group_idx 534 return 0; 535 } 536 537 static __rte_noinline int32_t 538 add_depth_big(struct rte_lpm *lpm, uint32_t ip_masked, uint8_t depth, 539 uint32_t next_hop) 540 { 541 #define group_idx next_hop 542 uint32_t tbl24_index; 543 int32_t tbl8_group_index, tbl8_group_start, tbl8_group_end, tbl8_index, 544 tbl8_range, i; 545 546 tbl24_index = (ip_masked >> 8); 547 tbl8_range = depth_to_range(depth); 548 549 if (!lpm->tbl24[tbl24_index].valid) { 550 /* Search for a free tbl8 group. */ 551 tbl8_group_index = tbl8_alloc(lpm->tbl8, lpm->number_tbl8s); 552 553 /* Check tbl8 allocation was successful. */ 554 if (tbl8_group_index < 0) { 555 return tbl8_group_index; 556 } 557 558 /* Find index into tbl8 and range. */ 559 tbl8_index = (tbl8_group_index * 560 RTE_LPM_TBL8_GROUP_NUM_ENTRIES) + 561 (ip_masked & 0xFF); 562 563 /* Set tbl8 entry. */ 564 for (i = tbl8_index; i < (tbl8_index + tbl8_range); i++) { 565 struct rte_lpm_tbl_entry new_tbl8_entry = { 566 .valid = VALID, 567 .depth = depth, 568 .valid_group = lpm->tbl8[i].valid_group, 569 .next_hop = next_hop, 570 }; 571 __atomic_store(&lpm->tbl8[i], &new_tbl8_entry, 572 __ATOMIC_RELAXED); 573 } 574 575 /* 576 * Update tbl24 entry to point to new tbl8 entry. Note: The 577 * ext_flag and tbl8_index need to be updated simultaneously, 578 * so assign whole structure in one go 579 */ 580 581 struct rte_lpm_tbl_entry new_tbl24_entry = { 582 .group_idx = tbl8_group_index, 583 .valid = VALID, 584 .valid_group = 1, 585 .depth = 0, 586 }; 587 588 /* The tbl24 entry must be written only after the 589 * tbl8 entries are written. 590 */ 591 __atomic_store(&lpm->tbl24[tbl24_index], &new_tbl24_entry, 592 __ATOMIC_RELEASE); 593 594 } /* If valid entry but not extended calculate the index into Table8. */ 595 else if (lpm->tbl24[tbl24_index].valid_group == 0) { 596 /* Search for free tbl8 group. */ 597 tbl8_group_index = tbl8_alloc(lpm->tbl8, lpm->number_tbl8s); 598 599 if (tbl8_group_index < 0) { 600 return tbl8_group_index; 601 } 602 603 tbl8_group_start = tbl8_group_index * 604 RTE_LPM_TBL8_GROUP_NUM_ENTRIES; 605 tbl8_group_end = tbl8_group_start + 606 RTE_LPM_TBL8_GROUP_NUM_ENTRIES; 607 608 /* Populate new tbl8 with tbl24 value. */ 609 for (i = tbl8_group_start; i < tbl8_group_end; i++) { 610 struct rte_lpm_tbl_entry new_tbl8_entry = { 611 .valid = VALID, 612 .depth = lpm->tbl24[tbl24_index].depth, 613 .valid_group = lpm->tbl8[i].valid_group, 614 .next_hop = lpm->tbl24[tbl24_index].next_hop, 615 }; 616 __atomic_store(&lpm->tbl8[i], &new_tbl8_entry, 617 __ATOMIC_RELAXED); 618 } 619 620 tbl8_index = tbl8_group_start + (ip_masked & 0xFF); 621 622 /* Insert new rule into the tbl8 entry. */ 623 for (i = tbl8_index; i < tbl8_index + tbl8_range; i++) { 624 struct rte_lpm_tbl_entry new_tbl8_entry = { 625 .valid = VALID, 626 .depth = depth, 627 .valid_group = lpm->tbl8[i].valid_group, 628 .next_hop = next_hop, 629 }; 630 __atomic_store(&lpm->tbl8[i], &new_tbl8_entry, 631 __ATOMIC_RELAXED); 632 } 633 634 /* 635 * Update tbl24 entry to point to new tbl8 entry. Note: The 636 * ext_flag and tbl8_index need to be updated simultaneously, 637 * so assign whole structure in one go. 638 */ 639 640 struct rte_lpm_tbl_entry new_tbl24_entry = { 641 .group_idx = tbl8_group_index, 642 .valid = VALID, 643 .valid_group = 1, 644 .depth = 0, 645 }; 646 647 /* The tbl24 entry must be written only after the 648 * tbl8 entries are written. 649 */ 650 __atomic_store(&lpm->tbl24[tbl24_index], &new_tbl24_entry, 651 __ATOMIC_RELEASE); 652 653 } else { /* 654 * If it is valid, extended entry calculate the index into tbl8. 655 */ 656 tbl8_group_index = lpm->tbl24[tbl24_index].group_idx; 657 tbl8_group_start = tbl8_group_index * 658 RTE_LPM_TBL8_GROUP_NUM_ENTRIES; 659 tbl8_index = tbl8_group_start + (ip_masked & 0xFF); 660 661 for (i = tbl8_index; i < (tbl8_index + tbl8_range); i++) { 662 663 if (!lpm->tbl8[i].valid || 664 lpm->tbl8[i].depth <= depth) { 665 struct rte_lpm_tbl_entry new_tbl8_entry = { 666 .valid = VALID, 667 .depth = depth, 668 .next_hop = next_hop, 669 .valid_group = lpm->tbl8[i].valid_group, 670 }; 671 672 /* 673 * Setting tbl8 entry in one go to avoid race 674 * condition 675 */ 676 __atomic_store(&lpm->tbl8[i], &new_tbl8_entry, 677 __ATOMIC_RELAXED); 678 679 continue; 680 } 681 } 682 } 683 #undef group_idx 684 return 0; 685 } 686 687 /* 688 * Add a route 689 */ 690 int 691 rte_lpm_add(struct rte_lpm *lpm, uint32_t ip, uint8_t depth, 692 uint32_t next_hop) 693 { 694 int32_t status = 0; 695 uint32_t ip_masked; 696 697 /* Check user arguments. */ 698 if ((lpm == NULL) || (depth < 1) || (depth > RTE_LPM_MAX_DEPTH)) 699 return -EINVAL; 700 701 ip_masked = ip & depth_to_mask(depth); 702 703 #if 0 704 /* Add the rule to the rule table. */ 705 rule_index = rule_add(lpm, ip_masked, depth, next_hop); 706 707 /* Skip table entries update if The rule is the same as 708 * the rule in the rules table. 709 */ 710 if (rule_index == -EEXIST) 711 return 0; 712 713 /* If the is no space available for new rule return error. */ 714 if (rule_index < 0) { 715 return rule_index; 716 } 717 #endif 718 719 if (depth <= MAX_DEPTH_TBL24) { 720 status = add_depth_small(lpm, ip_masked, depth, next_hop); 721 } else { /* If depth > RTE_LPM_MAX_DEPTH_TBL24 */ 722 status = add_depth_big(lpm, ip_masked, depth, next_hop); 723 724 /* 725 * If add fails due to exhaustion of tbl8 extensions delete 726 * rule that was added to rule table. 727 */ 728 if (status < 0) { 729 //rule_delete(lpm, rule_index, depth); 730 731 return status; 732 } 733 } 734 735 return 0; 736 } 737 738 #if 0 739 /* 740 * Look for a rule in the high-level rules table 741 */ 742 int 743 rte_lpm_is_rule_present(struct rte_lpm *lpm, uint32_t ip, uint8_t depth, 744 uint32_t *next_hop) 745 { 746 uint32_t ip_masked; 747 int32_t rule_index; 748 749 /* Check user arguments. */ 750 if ((lpm == NULL) || 751 (next_hop == NULL) || 752 (depth < 1) || (depth > RTE_LPM_MAX_DEPTH)) 753 return -EINVAL; 754 755 /* Look for the rule using rule_find. */ 756 ip_masked = ip & depth_to_mask(depth); 757 rule_index = rule_find(lpm, ip_masked, depth); 758 759 if (rule_index >= 0) { 760 *next_hop = lpm->rules_tbl[rule_index].next_hop; 761 return 1; 762 } 763 764 /* If rule is not found return 0. */ 765 return 0; 766 } 767 768 static int32_t 769 find_previous_rule(struct rte_lpm *lpm, uint32_t ip, uint8_t depth, 770 uint8_t *sub_rule_depth) 771 { 772 int32_t rule_index; 773 uint32_t ip_masked; 774 uint8_t prev_depth; 775 776 for (prev_depth = (uint8_t)(depth - 1); prev_depth > 0; prev_depth--) { 777 ip_masked = ip & depth_to_mask(prev_depth); 778 779 rule_index = rule_find(lpm, ip_masked, prev_depth); 780 781 if (rule_index >= 0) { 782 *sub_rule_depth = prev_depth; 783 return rule_index; 784 } 785 } 786 787 return -1; 788 } 789 #endif 790 791 static int32_t 792 delete_depth_small(struct rte_lpm *lpm, uint32_t ip_masked, 793 uint8_t depth, uint32_t sub_rule_nhop, uint8_t sub_rule_depth) 794 { 795 #define group_idx next_hop 796 uint32_t tbl24_range, tbl24_index, tbl8_group_index, tbl8_index, i, j; 797 798 /* Calculate the range and index into Table24. */ 799 tbl24_range = depth_to_range(depth); 800 tbl24_index = (ip_masked >> 8); 801 struct rte_lpm_tbl_entry zero_tbl24_entry = {0}; 802 803 /* 804 * Firstly check the sub_rule_index. A -1 indicates no replacement rule 805 * and a positive number indicates a sub_rule_index. 806 */ 807 if (sub_rule_nhop == 0) { 808 /* 809 * If no replacement rule exists then invalidate entries 810 * associated with this rule. 811 */ 812 for (i = tbl24_index; i < (tbl24_index + tbl24_range); i++) { 813 814 if (lpm->tbl24[i].valid_group == 0 && 815 lpm->tbl24[i].depth <= depth) { 816 __atomic_store(&lpm->tbl24[i], 817 &zero_tbl24_entry, __ATOMIC_RELEASE); 818 } else if (lpm->tbl24[i].valid_group == 1) { 819 /* 820 * If TBL24 entry is extended, then there has 821 * to be a rule with depth >= 25 in the 822 * associated TBL8 group. 823 */ 824 825 tbl8_group_index = lpm->tbl24[i].group_idx; 826 tbl8_index = tbl8_group_index * 827 RTE_LPM_TBL8_GROUP_NUM_ENTRIES; 828 829 for (j = tbl8_index; j < (tbl8_index + 830 RTE_LPM_TBL8_GROUP_NUM_ENTRIES); j++) { 831 832 if (lpm->tbl8[j].depth <= depth) 833 lpm->tbl8[j].valid = INVALID; 834 } 835 } 836 } 837 } else { 838 /* 839 * If a replacement rule exists then modify entries 840 * associated with this rule. 841 */ 842 843 struct rte_lpm_tbl_entry new_tbl24_entry = { 844 .next_hop = sub_rule_nhop, 845 .valid = VALID, 846 .valid_group = 0, 847 .depth = sub_rule_depth, 848 }; 849 850 struct rte_lpm_tbl_entry new_tbl8_entry = { 851 .valid = VALID, 852 .valid_group = VALID, 853 .depth = sub_rule_depth, 854 .next_hop = sub_rule_nhop, 855 }; 856 857 for (i = tbl24_index; i < (tbl24_index + tbl24_range); i++) { 858 859 if (lpm->tbl24[i].valid_group == 0 && 860 lpm->tbl24[i].depth <= depth) { 861 __atomic_store(&lpm->tbl24[i], &new_tbl24_entry, 862 __ATOMIC_RELEASE); 863 } else if (lpm->tbl24[i].valid_group == 1) { 864 /* 865 * If TBL24 entry is extended, then there has 866 * to be a rule with depth >= 25 in the 867 * associated TBL8 group. 868 */ 869 870 tbl8_group_index = lpm->tbl24[i].group_idx; 871 tbl8_index = tbl8_group_index * 872 RTE_LPM_TBL8_GROUP_NUM_ENTRIES; 873 874 for (j = tbl8_index; j < (tbl8_index + 875 RTE_LPM_TBL8_GROUP_NUM_ENTRIES); j++) { 876 877 if (lpm->tbl8[j].depth <= depth) 878 __atomic_store(&lpm->tbl8[j], 879 &new_tbl8_entry, 880 __ATOMIC_RELAXED); 881 } 882 } 883 } 884 } 885 #undef group_idx 886 return 0; 887 } 888 889 /* 890 * Checks if table 8 group can be recycled. 891 * 892 * Return of -EEXIST means tbl8 is in use and thus can not be recycled. 893 * Return of -EINVAL means tbl8 is empty and thus can be recycled 894 * Return of value > -1 means tbl8 is in use but has all the same values and 895 * thus can be recycled 896 */ 897 static int32_t 898 tbl8_recycle_check(struct rte_lpm_tbl_entry *tbl8, 899 uint32_t tbl8_group_start) 900 { 901 uint32_t tbl8_group_end, i; 902 tbl8_group_end = tbl8_group_start + RTE_LPM_TBL8_GROUP_NUM_ENTRIES; 903 904 /* 905 * Check the first entry of the given tbl8. If it is invalid we know 906 * this tbl8 does not contain any rule with a depth < RTE_LPM_MAX_DEPTH 907 * (As they would affect all entries in a tbl8) and thus this table 908 * can not be recycled. 909 */ 910 if (tbl8[tbl8_group_start].valid) { 911 /* 912 * If first entry is valid check if the depth is less than 24 913 * and if so check the rest of the entries to verify that they 914 * are all of this depth. 915 */ 916 if (tbl8[tbl8_group_start].depth <= MAX_DEPTH_TBL24) { 917 for (i = (tbl8_group_start + 1); i < tbl8_group_end; 918 i++) { 919 920 if (tbl8[i].depth != 921 tbl8[tbl8_group_start].depth) { 922 923 return -EEXIST; 924 } 925 } 926 /* If all entries are the same return the tb8 index */ 927 return tbl8_group_start; 928 } 929 930 return -EEXIST; 931 } 932 /* 933 * If the first entry is invalid check if the rest of the entries in 934 * the tbl8 are invalid. 935 */ 936 for (i = (tbl8_group_start + 1); i < tbl8_group_end; i++) { 937 if (tbl8[i].valid) 938 return -EEXIST; 939 } 940 /* If no valid entries are found then return -EINVAL. */ 941 return -EINVAL; 942 } 943 944 static int32_t 945 delete_depth_big(struct rte_lpm *lpm, uint32_t ip_masked, 946 uint8_t depth, uint32_t sub_rule_nhop, uint8_t sub_rule_depth) 947 { 948 #define group_idx next_hop 949 uint32_t tbl24_index, tbl8_group_index, tbl8_group_start, tbl8_index, 950 tbl8_range, i; 951 int32_t tbl8_recycle_index; 952 953 /* 954 * Calculate the index into tbl24 and range. Note: All depths larger 955 * than MAX_DEPTH_TBL24 are associated with only one tbl24 entry. 956 */ 957 tbl24_index = ip_masked >> 8; 958 959 /* Calculate the index into tbl8 and range. */ 960 tbl8_group_index = lpm->tbl24[tbl24_index].group_idx; 961 tbl8_group_start = tbl8_group_index * RTE_LPM_TBL8_GROUP_NUM_ENTRIES; 962 tbl8_index = tbl8_group_start + (ip_masked & 0xFF); 963 tbl8_range = depth_to_range(depth); 964 965 if (sub_rule_nhop == 0) { 966 /* 967 * Loop through the range of entries on tbl8 for which the 968 * rule_to_delete must be removed or modified. 969 */ 970 for (i = tbl8_index; i < (tbl8_index + tbl8_range); i++) { 971 if (lpm->tbl8[i].depth <= depth) 972 lpm->tbl8[i].valid = INVALID; 973 } 974 } else { 975 /* Set new tbl8 entry. */ 976 struct rte_lpm_tbl_entry new_tbl8_entry = { 977 .valid = VALID, 978 .depth = sub_rule_depth, 979 .valid_group = lpm->tbl8[tbl8_group_start].valid_group, 980 .next_hop = sub_rule_nhop, 981 }; 982 983 /* 984 * Loop through the range of entries on tbl8 for which the 985 * rule_to_delete must be modified. 986 */ 987 for (i = tbl8_index; i < (tbl8_index + tbl8_range); i++) { 988 if (lpm->tbl8[i].depth <= depth) 989 __atomic_store(&lpm->tbl8[i], &new_tbl8_entry, 990 __ATOMIC_RELAXED); 991 } 992 } 993 994 /* 995 * Check if there are any valid entries in this tbl8 group. If all 996 * tbl8 entries are invalid we can free the tbl8 and invalidate the 997 * associated tbl24 entry. 998 */ 999 1000 tbl8_recycle_index = tbl8_recycle_check(lpm->tbl8, tbl8_group_start); 1001 1002 if (tbl8_recycle_index == -EINVAL) { 1003 /* Set tbl24 before freeing tbl8 to avoid race condition. 1004 * Prevent the free of the tbl8 group from hoisting. 1005 */ 1006 lpm->tbl24[tbl24_index].valid = 0; 1007 __atomic_thread_fence(__ATOMIC_RELEASE); 1008 tbl8_free(lpm->tbl8, tbl8_group_start); 1009 } else if (tbl8_recycle_index > -1) { 1010 /* Update tbl24 entry. */ 1011 struct rte_lpm_tbl_entry new_tbl24_entry = { 1012 .next_hop = lpm->tbl8[tbl8_recycle_index].next_hop, 1013 .valid = VALID, 1014 .valid_group = 0, 1015 .depth = lpm->tbl8[tbl8_recycle_index].depth, 1016 }; 1017 1018 /* Set tbl24 before freeing tbl8 to avoid race condition. 1019 * Prevent the free of the tbl8 group from hoisting. 1020 */ 1021 __atomic_store(&lpm->tbl24[tbl24_index], &new_tbl24_entry, 1022 __ATOMIC_RELAXED); 1023 __atomic_thread_fence(__ATOMIC_RELEASE); 1024 tbl8_free(lpm->tbl8, tbl8_group_start); 1025 } 1026 #undef group_idx 1027 return 0; 1028 } 1029 1030 /* 1031 * Deletes a rule 1032 */ 1033 int 1034 rte_lpm_delete(struct rte_lpm *lpm, uint32_t ip, uint8_t depth, 1035 uint8_t sub_rule_depth, uint32_t sub_rule_nhop) 1036 { 1037 //int32_t rule_to_delete_index; 1038 uint32_t ip_masked; 1039 //uint8_t sub_rule_depth; 1040 /* 1041 * Check input arguments. Note: IP must be a positive integer of 32 1042 * bits in length therefore it need not be checked. 1043 */ 1044 if ((lpm == NULL) || (depth < 1) || (depth > RTE_LPM_MAX_DEPTH)) { 1045 return -EINVAL; 1046 } 1047 1048 ip_masked = ip & depth_to_mask(depth); 1049 1050 #if 0 1051 /* 1052 * Find the index of the input rule, that needs to be deleted, in the 1053 * rule table. 1054 */ 1055 rule_to_delete_index = rule_find(lpm, ip_masked, depth); 1056 1057 /* 1058 * Check if rule_to_delete_index was found. If no rule was found the 1059 * function rule_find returns -EINVAL. 1060 */ 1061 if (rule_to_delete_index < 0) 1062 return -EINVAL; 1063 1064 /* Delete the rule from the rule table. */ 1065 rule_delete(lpm, rule_to_delete_index, depth); 1066 #endif 1067 1068 /* 1069 * Find rule to replace the rule_to_delete. If there is no rule to 1070 * replace the rule_to_delete we return -1 and invalidate the table 1071 * entries associated with this rule. 1072 */ 1073 //sub_rule_depth = *psub_rule_depth; 1074 //sub_rule_index = find_previous_rule(lpm, ip, depth, &sub_rule_depth); 1075 1076 /* 1077 * If the input depth value is less than 25 use function 1078 * delete_depth_small otherwise use delete_depth_big. 1079 */ 1080 if (depth <= MAX_DEPTH_TBL24) { 1081 return delete_depth_small(lpm, ip_masked, depth, 1082 sub_rule_nhop, sub_rule_depth); 1083 } else { /* If depth > MAX_DEPTH_TBL24 */ 1084 return delete_depth_big(lpm, ip_masked, depth, sub_rule_nhop, 1085 sub_rule_depth); 1086 } 1087 } 1088 1089 /* 1090 * Delete all rules from the LPM table. 1091 */ 1092 void 1093 rte_lpm_delete_all(struct rte_lpm *lpm) 1094 { 1095 /* Zero rule information. */ 1096 memset(lpm->rule_info, 0, sizeof(lpm->rule_info)); 1097 1098 /* Zero tbl24. */ 1099 memset(lpm->tbl24, 0, sizeof(lpm->tbl24)); 1100 1101 /* Zero tbl8. */ 1102 memset(lpm->tbl8, 0, sizeof(lpm->tbl8[0]) 1103 * RTE_LPM_TBL8_GROUP_NUM_ENTRIES * lpm->number_tbl8s); 1104 1105 /* Delete all rules form the rules table. */ 1106 memset(lpm->rules_tbl, 0, sizeof(lpm->rules_tbl[0]) * lpm->max_rules); 1107 }
Cache object: cc2257d330d5b38bd9d0103df6670622
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