1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
10 * RTE Longest Prefix Match (LPM)
14 #include <sys/queue.h>
17 #include <rte_branch_prediction.h>
18 #include <rte_byteorder.h>
19 #include <rte_config.h>
20 #include <rte_memory.h>
21 #include <rte_common.h>
23 #include <rte_compat.h>
29 /** Max number of characters in LPM name. */
30 #define RTE_LPM_NAMESIZE 32
32 /** Maximum depth value possible for IPv4 LPM. */
33 #define RTE_LPM_MAX_DEPTH 32
35 /** @internal Total number of tbl24 entries. */
36 #define RTE_LPM_TBL24_NUM_ENTRIES (1 << 24)
38 /** @internal Number of entries in a tbl8 group. */
39 #define RTE_LPM_TBL8_GROUP_NUM_ENTRIES 256
41 /** @internal Max number of tbl8 groups in the tbl8. */
42 #define RTE_LPM_MAX_TBL8_NUM_GROUPS (1 << 24)
44 /** @internal Total number of tbl8 groups in the tbl8. */
45 #define RTE_LPM_TBL8_NUM_GROUPS 256
47 /** @internal Total number of tbl8 entries. */
48 #define RTE_LPM_TBL8_NUM_ENTRIES (RTE_LPM_TBL8_NUM_GROUPS * \
49 RTE_LPM_TBL8_GROUP_NUM_ENTRIES)
51 /** @internal Macro to enable/disable run-time checks. */
52 #if defined(RTE_LIBRTE_LPM_DEBUG)
53 #define RTE_LPM_RETURN_IF_TRUE(cond, retval) do { \
54 if (cond) return (retval); \
57 #define RTE_LPM_RETURN_IF_TRUE(cond, retval)
60 /** @internal bitmask with valid and valid_group fields set */
61 #define RTE_LPM_VALID_EXT_ENTRY_BITMASK 0x03000000
63 /** Bitmask used to indicate successful lookup */
64 #define RTE_LPM_LOOKUP_SUCCESS 0x01000000
66 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
67 /** @internal Tbl24 entry structure. */
69 struct rte_lpm_tbl_entry_v20 {
71 * Stores Next hop (tbl8 or tbl24 when valid_group is not set) or
72 * a group index pointing to a tbl8 structure (tbl24 only, when
80 /* Using single uint8_t to store 3 values. */
81 uint8_t valid :1; /**< Validation flag. */
84 * - valid_group == 0: entry stores a next hop
85 * - valid_group == 1: entry stores a group_index pointing to a tbl8
87 * - valid_group indicates whether the current tbl8 is in use or not
89 uint8_t valid_group :1;
90 uint8_t depth :6; /**< Rule depth. */
94 struct rte_lpm_tbl_entry {
96 * Stores Next hop (tbl8 or tbl24 when valid_group is not set) or
97 * a group index pointing to a tbl8 structure (tbl24 only, when
100 uint32_t next_hop :24;
101 /* Using single uint8_t to store 3 values. */
102 uint32_t valid :1; /**< Validation flag. */
105 * - valid_group == 0: entry stores a next hop
106 * - valid_group == 1: entry stores a group_index pointing to a tbl8
108 * - valid_group indicates whether the current tbl8 is in use or not
110 uint32_t valid_group :1;
111 uint32_t depth :6; /**< Rule depth. */
116 struct rte_lpm_tbl_entry_v20 {
118 uint8_t valid_group :1;
127 struct rte_lpm_tbl_entry {
129 uint32_t valid_group :1;
131 uint32_t next_hop :24;
137 /** LPM configuration structure. */
138 struct rte_lpm_config {
139 uint32_t max_rules; /**< Max number of rules. */
140 uint32_t number_tbl8s; /**< Number of tbl8s to allocate. */
141 int flags; /**< This field is currently unused. */
144 /** @internal Rule structure. */
145 struct rte_lpm_rule_v20 {
146 uint32_t ip; /**< Rule IP address. */
147 uint8_t next_hop; /**< Rule next hop. */
150 struct rte_lpm_rule {
151 uint32_t ip; /**< Rule IP address. */
152 uint32_t next_hop; /**< Rule next hop. */
155 /** @internal Contains metadata about the rules table. */
156 struct rte_lpm_rule_info {
157 uint32_t used_rules; /**< Used rules so far. */
158 uint32_t first_rule; /**< Indexes the first rule of a given depth. */
161 /** @internal LPM structure. */
164 char name[RTE_LPM_NAMESIZE]; /**< Name of the lpm. */
165 uint32_t max_rules; /**< Max. balanced rules per lpm. */
166 struct rte_lpm_rule_info rule_info[RTE_LPM_MAX_DEPTH]; /**< Rule info table. */
169 struct rte_lpm_tbl_entry_v20 tbl24[RTE_LPM_TBL24_NUM_ENTRIES]
170 __rte_cache_aligned; /**< LPM tbl24 table. */
171 struct rte_lpm_tbl_entry_v20 tbl8[RTE_LPM_TBL8_NUM_ENTRIES]
172 __rte_cache_aligned; /**< LPM tbl8 table. */
173 struct rte_lpm_rule_v20 rules_tbl[]
174 __rte_cache_aligned; /**< LPM rules. */
179 char name[RTE_LPM_NAMESIZE]; /**< Name of the lpm. */
180 uint32_t max_rules; /**< Max. balanced rules per lpm. */
181 uint32_t number_tbl8s; /**< Number of tbl8s. */
182 struct rte_lpm_rule_info rule_info[RTE_LPM_MAX_DEPTH]; /**< Rule info table. */
185 struct rte_lpm_tbl_entry tbl24[RTE_LPM_TBL24_NUM_ENTRIES]
186 __rte_cache_aligned; /**< LPM tbl24 table. */
187 struct rte_lpm_tbl_entry *tbl8; /**< LPM tbl8 table. */
188 struct rte_lpm_rule *rules_tbl; /**< LPM rules. */
192 * Create an LPM object.
197 * NUMA socket ID for LPM table memory allocation
199 * Structure containing the configuration
201 * Handle to LPM object on success, NULL otherwise with rte_errno set
202 * to an appropriate values. Possible rte_errno values include:
203 * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
204 * - E_RTE_SECONDARY - function was called from a secondary process instance
205 * - EINVAL - invalid parameter passed to function
206 * - ENOSPC - the maximum number of memzones has already been allocated
207 * - EEXIST - a memzone with the same name already exists
208 * - ENOMEM - no appropriate memory area found in which to create memzone
211 rte_lpm_create(const char *name, int socket_id,
212 const struct rte_lpm_config *config);
214 rte_lpm_create_v20(const char *name, int socket_id, int max_rules, int flags);
216 rte_lpm_create_v1604(const char *name, int socket_id,
217 const struct rte_lpm_config *config);
220 * Find an existing LPM object and return a pointer to it.
223 * Name of the lpm object as passed to rte_lpm_create()
225 * Pointer to lpm object or NULL if object not found with rte_errno
226 * set appropriately. Possible rte_errno values include:
227 * - ENOENT - required entry not available to return.
230 rte_lpm_find_existing(const char *name);
232 rte_lpm_find_existing_v20(const char *name);
234 rte_lpm_find_existing_v1604(const char *name);
237 * Free an LPM object.
245 rte_lpm_free(struct rte_lpm *lpm);
247 rte_lpm_free_v20(struct rte_lpm_v20 *lpm);
249 rte_lpm_free_v1604(struct rte_lpm *lpm);
252 * Add a rule to the LPM table.
257 * IP of the rule to be added to the LPM table
259 * Depth of the rule to be added to the LPM table
261 * Next hop of the rule to be added to the LPM table
263 * 0 on success, negative value otherwise
266 rte_lpm_add(struct rte_lpm *lpm, uint32_t ip, uint8_t depth, uint32_t next_hop);
268 rte_lpm_add_v20(struct rte_lpm_v20 *lpm, uint32_t ip, uint8_t depth,
271 rte_lpm_add_v1604(struct rte_lpm *lpm, uint32_t ip, uint8_t depth,
275 * Check if a rule is present in the LPM table,
276 * and provide its next hop if it is.
281 * IP of the rule to be searched
283 * Depth of the rule to searched
285 * Next hop of the rule (valid only if it is found)
287 * 1 if the rule exists, 0 if it does not, a negative value on failure
290 rte_lpm_is_rule_present(struct rte_lpm *lpm, uint32_t ip, uint8_t depth,
293 rte_lpm_is_rule_present_v20(struct rte_lpm_v20 *lpm, uint32_t ip, uint8_t depth,
296 rte_lpm_is_rule_present_v1604(struct rte_lpm *lpm, uint32_t ip, uint8_t depth,
300 * Delete a rule from the LPM table.
305 * IP of the rule to be deleted from the LPM table
307 * Depth of the rule to be deleted from the LPM table
309 * 0 on success, negative value otherwise
312 rte_lpm_delete(struct rte_lpm *lpm, uint32_t ip, uint8_t depth);
314 rte_lpm_delete_v20(struct rte_lpm_v20 *lpm, uint32_t ip, uint8_t depth);
316 rte_lpm_delete_v1604(struct rte_lpm *lpm, uint32_t ip, uint8_t depth);
319 * Delete all rules from the LPM table.
325 rte_lpm_delete_all(struct rte_lpm *lpm);
327 rte_lpm_delete_all_v20(struct rte_lpm_v20 *lpm);
329 rte_lpm_delete_all_v1604(struct rte_lpm *lpm);
332 * Lookup an IP into the LPM table.
337 * IP to be looked up in the LPM table
339 * Next hop of the most specific rule found for IP (valid on lookup hit only)
341 * -EINVAL for incorrect arguments, -ENOENT on lookup miss, 0 on lookup hit
344 rte_lpm_lookup(struct rte_lpm *lpm, uint32_t ip, uint32_t *next_hop)
346 unsigned tbl24_index = (ip >> 8);
348 const uint32_t *ptbl;
350 /* DEBUG: Check user input arguments. */
351 RTE_LPM_RETURN_IF_TRUE(((lpm == NULL) || (next_hop == NULL)), -EINVAL);
353 /* Copy tbl24 entry */
354 ptbl = (const uint32_t *)(&lpm->tbl24[tbl24_index]);
357 /* Copy tbl8 entry (only if needed) */
358 if (unlikely((tbl_entry & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
359 RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
361 unsigned tbl8_index = (uint8_t)ip +
362 (((uint32_t)tbl_entry & 0x00FFFFFF) *
363 RTE_LPM_TBL8_GROUP_NUM_ENTRIES);
365 ptbl = (const uint32_t *)&lpm->tbl8[tbl8_index];
369 *next_hop = ((uint32_t)tbl_entry & 0x00FFFFFF);
370 return (tbl_entry & RTE_LPM_LOOKUP_SUCCESS) ? 0 : -ENOENT;
374 * Lookup multiple IP addresses in an LPM table. This may be implemented as a
375 * macro, so the address of the function should not be used.
380 * Array of IPs to be looked up in the LPM table
382 * Next hop of the most specific rule found for IP (valid on lookup hit only).
383 * This is an array of two byte values. The most significant byte in each
384 * value says whether the lookup was successful (bitmask
385 * RTE_LPM_LOOKUP_SUCCESS is set). The least significant byte is the
388 * Number of elements in ips (and next_hops) array to lookup. This should be a
389 * compile time constant, and divisible by 8 for best performance.
391 * -EINVAL for incorrect arguments, otherwise 0
393 #define rte_lpm_lookup_bulk(lpm, ips, next_hops, n) \
394 rte_lpm_lookup_bulk_func(lpm, ips, next_hops, n)
397 rte_lpm_lookup_bulk_func(const struct rte_lpm *lpm, const uint32_t *ips,
398 uint32_t *next_hops, const unsigned n)
401 unsigned tbl24_indexes[n];
402 const uint32_t *ptbl;
404 /* DEBUG: Check user input arguments. */
405 RTE_LPM_RETURN_IF_TRUE(((lpm == NULL) || (ips == NULL) ||
406 (next_hops == NULL)), -EINVAL);
408 for (i = 0; i < n; i++) {
409 tbl24_indexes[i] = ips[i] >> 8;
412 for (i = 0; i < n; i++) {
413 /* Simply copy tbl24 entry to output */
414 ptbl = (const uint32_t *)&lpm->tbl24[tbl24_indexes[i]];
415 next_hops[i] = *ptbl;
417 /* Overwrite output with tbl8 entry if needed */
418 if (unlikely((next_hops[i] & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
419 RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
421 unsigned tbl8_index = (uint8_t)ips[i] +
422 (((uint32_t)next_hops[i] & 0x00FFFFFF) *
423 RTE_LPM_TBL8_GROUP_NUM_ENTRIES);
425 ptbl = (const uint32_t *)&lpm->tbl8[tbl8_index];
426 next_hops[i] = *ptbl;
432 /* Mask four results. */
433 #define RTE_LPM_MASKX4_RES UINT64_C(0x00ffffff00ffffff)
436 * Lookup four IP addresses in an LPM table.
441 * Four IPs to be looked up in the LPM table
443 * Next hop of the most specific rule found for IP (valid on lookup hit only).
444 * This is an 4 elements array of two byte values.
445 * If the lookup was succesfull for the given IP, then least significant byte
446 * of the corresponding element is the actual next hop and the most
447 * significant byte is zero.
448 * If the lookup for the given IP failed, then corresponding element would
449 * contain default value, see description of then next parameter.
451 * Default value to populate into corresponding element of hop[] array,
452 * if lookup would fail.
455 rte_lpm_lookupx4(const struct rte_lpm *lpm, xmm_t ip, uint32_t hop[4],
458 #if defined(RTE_ARCH_ARM) || defined(RTE_ARCH_ARM64)
459 #include "rte_lpm_neon.h"
460 #elif defined(RTE_ARCH_PPC_64)
461 #include "rte_lpm_altivec.h"
463 #include "rte_lpm_sse.h"
470 #endif /* _RTE_LPM_H_ */