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41 #include <sys/queue.h>
42 #include <rte_memory.h>
43 #include <rte_memzone.h>
44 #include <rte_tailq.h>
46 #include <rte_hash_crc.h>
47 #include <rte_malloc.h>
48 #include <rte_common.h>
49 #include <rte_per_lcore.h>
50 #include <rte_errno.h>
51 #include <rte_string_fns.h>
52 #include <rte_cpuflags.h>
55 #include "rte_fbk_hash.h"
56 #include "rte_jhash.h"
57 #include "rte_hash_crc.h"
59 TAILQ_HEAD(rte_fbk_hash_list, rte_fbk_hash_table);
61 /* global list of fbk_hashes (used for debug/dump) */
62 static struct rte_fbk_hash_list *fbk_hash_list = NULL;
64 /* macro to prevent duplication of list creation check code */
65 #define CHECK_FBK_HASH_LIST_CREATED() do { \
66 if (fbk_hash_list == NULL) \
67 if ((fbk_hash_list = RTE_TAILQ_RESERVE("RTE_FBK_HASH", \
68 rte_fbk_hash_list)) == NULL){ \
69 rte_errno = E_RTE_NO_TAILQ; \
76 * Performs a lookup for an existing hash table, and returns a pointer to
80 * Name of the hash table to find
83 * pointer to hash table structure or NULL on error.
85 struct rte_fbk_hash_table *
86 rte_fbk_hash_find_existing(const char *name)
88 struct rte_fbk_hash_table *h;
90 /* check that we have an initialised tail queue */
91 CHECK_FBK_HASH_LIST_CREATED();
93 TAILQ_FOREACH(h, fbk_hash_list, next) {
94 if (strncmp(name, h->name, RTE_FBK_HASH_NAMESIZE) == 0)
103 * Create a new hash table for use with four byte keys.
106 * Parameters used in creation of hash table.
109 * Pointer to hash table structure that is used in future hash table
110 * operations, or NULL on error.
112 struct rte_fbk_hash_table *
113 rte_fbk_hash_create(const struct rte_fbk_hash_params *params)
115 struct rte_fbk_hash_table *ht;
116 char hash_name[RTE_FBK_HASH_NAMESIZE];
117 const uint32_t mem_size =
118 sizeof(*ht) + (sizeof(ht->t[0]) * params->entries);
121 /* check that we have access to create things in shared memory. */
122 if (rte_eal_process_type() == RTE_PROC_SECONDARY){
123 rte_errno = E_RTE_SECONDARY;
127 /* check that we have an initialised tail queue */
128 CHECK_FBK_HASH_LIST_CREATED();
130 /* Error checking of parameters. */
131 if ((!rte_is_power_of_2(params->entries)) ||
132 (!rte_is_power_of_2(params->entries_per_bucket)) ||
133 (params->entries == 0) ||
134 (params->entries_per_bucket == 0) ||
135 (params->entries_per_bucket > params->entries) ||
136 (params->entries > RTE_FBK_HASH_ENTRIES_MAX) ||
137 (params->entries_per_bucket > RTE_FBK_HASH_ENTRIES_MAX)){
142 rte_snprintf(hash_name, sizeof(hash_name), "FBK_%s", params->name);
144 /* Allocate memory for table. */
145 #if defined(RTE_LIBRTE_HASH_USE_MEMZONE)
146 const struct rte_memzone *mz;
147 mz = rte_memzone_reserve(hash_name, mem_size, params->socket_id, 0);
150 ht = (struct rte_fbk_hash_table *)mz->addr;
152 ht = (struct rte_fbk_hash_table *)rte_malloc(hash_name, mem_size, 0);
156 memset(ht, 0, mem_size);
158 /* Set up hash table context. */
159 rte_snprintf(ht->name, sizeof(ht->name), "%s", params->name);
160 ht->entries = params->entries;
161 ht->entries_per_bucket = params->entries_per_bucket;
162 ht->used_entries = 0;
163 ht->bucket_mask = (params->entries / params->entries_per_bucket) - 1;
164 for (ht->bucket_shift = 0, i = 1;
165 (params->entries_per_bucket & i) == 0;
166 ht->bucket_shift++, i <<= 1)
167 ; /* empty loop body */
169 if (params->hash_func != NULL) {
170 ht->hash_func = params->hash_func;
171 ht->init_val = params->init_val;
174 ht->hash_func = RTE_FBK_HASH_FUNC_DEFAULT;
175 ht->init_val = RTE_FBK_HASH_INIT_VAL_DEFAULT;
178 if (ht->hash_func == rte_hash_crc_4byte &&
179 !rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE4_2)) {
180 RTE_LOG(WARNING, HASH, "CRC32 instruction requires SSE4.2, "
181 "which is not supported on this system. "
182 "Falling back to software hash\n.");
183 ht->hash_func = rte_jhash_1word;
186 TAILQ_INSERT_TAIL(fbk_hash_list, ht, next);
191 * Free all memory used by a hash table.
194 * Hash table to deallocate.
197 rte_fbk_hash_free(struct rte_fbk_hash_table *ht)
201 /* No way to deallocate memzones - but can de-allocate from malloc */
202 #if !defined(RTE_LIBRTE_HASH_USE_MEMZONE)
203 TAILQ_REMOVE(fbk_hash_list, ht, next);