1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2016 Intel Corporation
3 * Copyright(c) 2018 Arm Limited
7 * This file hold Cuckoo Hash private data structures to allows include from
8 * platform specific files like rte_cuckoo_hash_x86.h
11 #ifndef _RTE_CUCKOO_HASH_H_
12 #define _RTE_CUCKOO_HASH_H_
14 #if defined(RTE_ARCH_X86)
15 #include "rte_cmp_x86.h"
18 #if defined(RTE_ARCH_ARM64)
19 #include "rte_cmp_arm64.h"
22 /* Macro to enable/disable run-time checking of function parameters */
23 #if defined(RTE_LIBRTE_HASH_DEBUG)
24 #define RETURN_IF_TRUE(cond, retval) do { \
29 #define RETURN_IF_TRUE(cond, retval)
32 #if defined(RTE_LIBRTE_HASH_DEBUG)
33 #define ERR_IF_TRUE(cond, fmt, args...) do { \
35 RTE_LOG(ERR, HASH, fmt, ##args); \
40 #define ERR_IF_TRUE(cond, fmt, args...)
43 #include <rte_hash_crc.h>
44 #include <rte_jhash.h>
46 #if defined(RTE_ARCH_X86) || defined(RTE_ARCH_ARM64)
48 * All different options to select a key compare function,
49 * based on the key size and custom function.
51 enum cmp_jump_table_case {
66 * Table storing all different key compare functions
67 * (multi-process supported)
69 const rte_hash_cmp_eq_t cmp_jump_table[NUM_KEY_CMP_CASES] = {
83 * All different options to select a key compare function,
84 * based on the key size and custom function.
86 enum cmp_jump_table_case {
93 * Table storing all different key compare functions
94 * (multi-process supported)
96 const rte_hash_cmp_eq_t cmp_jump_table[NUM_KEY_CMP_CASES] = {
104 /** Number of items per bucket. */
105 #define RTE_HASH_BUCKET_ENTRIES 8
107 #if !RTE_IS_POWER_OF_2(RTE_HASH_BUCKET_ENTRIES)
108 #error RTE_HASH_BUCKET_ENTRIES must be a power of 2
111 #define NULL_SIGNATURE 0
115 #define KEY_ALIGNMENT 16
117 #define LCORE_CACHE_SIZE 64
119 #define RTE_HASH_BFS_QUEUE_MAX_LEN 1000
121 #define RTE_XABORT_CUCKOO_PATH_INVALIDED 0x4
123 #define RTE_HASH_TSX_MAX_RETRY 10
126 unsigned len; /**< Cache len */
127 uint32_t objs[LCORE_CACHE_SIZE]; /**< Cache objects */
128 } __rte_cache_aligned;
130 /* Structure that stores key-value pair */
131 struct rte_hash_key {
136 /* Variable key size */
140 /* All different signature compare functions */
141 enum rte_hash_sig_compare_function {
142 RTE_HASH_COMPARE_SCALAR = 0,
143 RTE_HASH_COMPARE_SSE,
144 RTE_HASH_COMPARE_NEON,
148 /** Bucket structure */
149 struct rte_hash_bucket {
150 uint16_t sig_current[RTE_HASH_BUCKET_ENTRIES];
152 uint32_t key_idx[RTE_HASH_BUCKET_ENTRIES];
154 uint8_t flag[RTE_HASH_BUCKET_ENTRIES];
157 } __rte_cache_aligned;
159 /** A hash table structure. */
161 char name[RTE_HASH_NAMESIZE]; /**< Name of the hash. */
162 uint32_t entries; /**< Total table entries. */
163 uint32_t num_buckets; /**< Number of buckets in table. */
165 struct rte_ring *free_slots;
166 /**< Ring that stores all indexes of the free slots in the key table */
168 struct lcore_cache *local_free_slots;
169 /**< Local cache per lcore, storing some indexes of the free slots */
172 struct rte_hash_rcu_config *hash_rcu_cfg;
173 /**< HASH RCU QSBR configuration structure */
174 struct rte_rcu_qsbr_dq *dq; /**< RCU QSBR defer queue. */
176 /* Fields used in lookup */
178 uint32_t key_len __rte_cache_aligned;
179 /**< Length of hash key. */
180 uint8_t hw_trans_mem_support;
181 /**< If hardware transactional memory is used. */
182 uint8_t use_local_cache;
183 /**< If multi-writer support is enabled, use local cache
184 * to allocate key-store slots.
186 uint8_t readwrite_concur_support;
187 /**< If read-write concurrency support is enabled */
188 uint8_t ext_table_support; /**< Enable extendable bucket table */
189 uint8_t no_free_on_del;
190 /**< If key index should be freed on calling rte_hash_del_xxx APIs.
191 * If this is set, rte_hash_free_key_with_position must be called to
192 * free the key index associated with the deleted entry.
193 * This flag is enabled by default.
195 uint8_t readwrite_concur_lf_support;
196 /**< If read-write concurrency lock free support is enabled */
197 uint8_t writer_takes_lock;
198 /**< Indicates if the writer threads need to take lock */
199 rte_hash_function hash_func; /**< Function used to calculate hash. */
200 uint32_t hash_func_init_val; /**< Init value used by hash_func. */
201 rte_hash_cmp_eq_t rte_hash_custom_cmp_eq;
202 /**< Custom function used to compare keys. */
203 enum cmp_jump_table_case cmp_jump_table_idx;
204 /**< Indicates which compare function to use. */
205 enum rte_hash_sig_compare_function sig_cmp_fn;
206 /**< Indicates which signature compare function to use. */
207 uint32_t bucket_bitmask;
208 /**< Bitmask for getting bucket index from hash signature. */
209 uint32_t key_entry_size; /**< Size of each key entry. */
211 void *key_store; /**< Table storing all keys and data */
212 struct rte_hash_bucket *buckets;
213 /**< Table with buckets storing all the hash values and key indexes
216 rte_rwlock_t *readwrite_lock; /**< Read-write lock thread-safety. */
217 struct rte_hash_bucket *buckets_ext; /**< Extra buckets array */
218 struct rte_ring *free_ext_bkts; /**< Ring of indexes of free buckets */
219 /* Stores index of an empty ext bkt to be recycled on calling
220 * rte_hash_del_xxx APIs. When lock free read-write concurrency is
221 * enabled, an empty ext bkt cannot be put into free list immediately
222 * (as readers might be using it still). Hence freeing of the ext bkt
223 * is piggy-backed to freeing of the key index.
225 uint32_t *ext_bkt_to_free;
226 uint32_t *tbl_chng_cnt;
227 /**< Indicates if the hash table changed from last read. */
228 } __rte_cache_aligned;
231 struct rte_hash_bucket *bkt; /* Current bucket on the bfs search */
232 uint32_t cur_bkt_idx;
234 struct queue_node *prev; /* Parent(bucket) in search path */
235 int prev_slot; /* Parent(slot) in search path */
238 /** @internal Default RCU defer queue entries to reclaim in one go. */
239 #define RTE_HASH_RCU_DQ_RECLAIM_MAX 16