460 lines
14 KiB
C
460 lines
14 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _RTE_HASH_H_
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#define _RTE_HASH_H_
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/**
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* @file
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*
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* RTE Hash Table
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*/
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#include <stdint.h>
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** Maximum size of hash table that can be created. */
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#define RTE_HASH_ENTRIES_MAX (1 << 30)
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/** Maximum number of characters in hash name.*/
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#define RTE_HASH_NAMESIZE 32
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/** Maximum number of keys that can be searched for using rte_hash_lookup_bulk. */
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#define RTE_HASH_LOOKUP_BULK_MAX 64
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#define RTE_HASH_LOOKUP_MULTI_MAX RTE_HASH_LOOKUP_BULK_MAX
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/** Enable Hardware transactional memory support. */
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#define RTE_HASH_EXTRA_FLAGS_TRANS_MEM_SUPPORT 0x01
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/** Default behavior of insertion, single writer/multi writer */
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#define RTE_HASH_EXTRA_FLAGS_MULTI_WRITER_ADD 0x02
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/** Signature of key that is stored internally. */
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typedef uint32_t hash_sig_t;
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/** Type of function that can be used for calculating the hash value. */
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typedef uint32_t (*rte_hash_function)(const void *key, uint32_t key_len,
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uint32_t init_val);
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/** Type of function used to compare the hash key. */
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typedef int (*rte_hash_cmp_eq_t)(const void *key1, const void *key2, size_t key_len);
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/**
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* Parameters used when creating the hash table.
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*/
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struct rte_hash_parameters {
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const char *name; /**< Name of the hash. */
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uint32_t entries; /**< Total hash table entries. */
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uint32_t reserved; /**< Unused field. Should be set to 0 */
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uint32_t key_len; /**< Length of hash key. */
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rte_hash_function hash_func; /**< Primary Hash function used to calculate hash. */
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uint32_t hash_func_init_val; /**< Init value used by hash_func. */
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int socket_id; /**< NUMA Socket ID for memory. */
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uint8_t extra_flag; /**< Indicate if additional parameters are present. */
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};
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/** @internal A hash table structure. */
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struct rte_hash;
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/**
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* Create a new hash table.
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*
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* @param params
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* Parameters used to create and initialise the hash table.
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* @return
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* Pointer to hash table structure that is used in future hash table
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* operations, or NULL on error, with error code set in rte_errno.
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* Possible rte_errno errors include:
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* - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
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* - E_RTE_SECONDARY - function was called from a secondary process instance
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* - ENOENT - missing entry
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* - EINVAL - invalid parameter passed to function
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* - ENOSPC - the maximum number of memzones has already been allocated
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* - EEXIST - a memzone with the same name already exists
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* - ENOMEM - no appropriate memory area found in which to create memzone
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*/
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struct rte_hash *
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rte_hash_create(const struct rte_hash_parameters *params);
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/**
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* Set a new hash compare function other than the default one.
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*
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* @note Function pointer does not work with multi-process, so do not use it
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* in multi-process mode.
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*
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* @param h
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* Hash table for which the function is to be changed
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* @param func
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* New compare function
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*/
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void rte_hash_set_cmp_func(struct rte_hash *h, rte_hash_cmp_eq_t func);
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/**
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* Find an existing hash table object and return a pointer to it.
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*
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* @param name
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* Name of the hash table as passed to rte_hash_create()
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* @return
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* Pointer to hash table or NULL if object not found
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* with rte_errno set appropriately. Possible rte_errno values include:
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* - ENOENT - value not available for return
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*/
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struct rte_hash *
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rte_hash_find_existing(const char *name);
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/**
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* De-allocate all memory used by hash table.
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* @param h
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* Hash table to free
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*/
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void
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rte_hash_free(struct rte_hash *h);
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/**
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* Reset all hash structure, by zeroing all entries
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* @param h
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* Hash table to reset
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*/
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void
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rte_hash_reset(struct rte_hash *h);
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/**
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* Add a key-value pair to an existing hash table.
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* This operation is not multi-thread safe
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* and should only be called from one thread.
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*
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* @param h
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* Hash table to add the key to.
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* @param key
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* Key to add to the hash table.
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* @param data
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* Data to add to the hash table.
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* @return
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* - 0 if added successfully
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* - -EINVAL if the parameters are invalid.
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* - -ENOSPC if there is no space in the hash for this key.
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*/
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int
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rte_hash_add_key_data(const struct rte_hash *h, const void *key, void *data);
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/**
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* Add a key-value pair with a pre-computed hash value
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* to an existing hash table.
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* This operation is not multi-thread safe
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* and should only be called from one thread.
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*
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* @param h
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* Hash table to add the key to.
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* @param key
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* Key to add to the hash table.
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* @param sig
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* Precomputed hash value for 'key'
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* @param data
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* Data to add to the hash table.
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* @return
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* - 0 if added successfully
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* - -EINVAL if the parameters are invalid.
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* - -ENOSPC if there is no space in the hash for this key.
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*/
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int32_t
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rte_hash_add_key_with_hash_data(const struct rte_hash *h, const void *key,
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hash_sig_t sig, void *data);
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/**
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* Add a key to an existing hash table. This operation is not multi-thread safe
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* and should only be called from one thread.
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*
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* @param h
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* Hash table to add the key to.
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* @param key
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* Key to add to the hash table.
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* @return
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* - -EINVAL if the parameters are invalid.
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* - -ENOSPC if there is no space in the hash for this key.
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* - A positive value that can be used by the caller as an offset into an
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* array of user data. This value is unique for this key.
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*/
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int32_t
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rte_hash_add_key(const struct rte_hash *h, const void *key);
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/**
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* Add a key to an existing hash table.
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* This operation is not multi-thread safe
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* and should only be called from one thread.
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*
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* @param h
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* Hash table to add the key to.
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* @param key
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* Key to add to the hash table.
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* @param sig
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* Precomputed hash value for 'key'.
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* @return
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* - -EINVAL if the parameters are invalid.
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* - -ENOSPC if there is no space in the hash for this key.
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* - A positive value that can be used by the caller as an offset into an
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* array of user data. This value is unique for this key.
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*/
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int32_t
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rte_hash_add_key_with_hash(const struct rte_hash *h, const void *key, hash_sig_t sig);
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/**
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* Remove a key from an existing hash table.
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* This operation is not multi-thread safe
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* and should only be called from one thread.
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*
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* @param h
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* Hash table to remove the key from.
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* @param key
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* Key to remove from the hash table.
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* @return
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* - -EINVAL if the parameters are invalid.
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* - -ENOENT if the key is not found.
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* - A positive value that can be used by the caller as an offset into an
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* array of user data. This value is unique for this key, and is the same
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* value that was returned when the key was added.
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*/
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int32_t
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rte_hash_del_key(const struct rte_hash *h, const void *key);
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/**
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* Remove a key from an existing hash table.
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* This operation is not multi-thread safe
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* and should only be called from one thread.
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*
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* @param h
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* Hash table to remove the key from.
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* @param key
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* Key to remove from the hash table.
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* @param sig
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* Precomputed hash value for 'key'.
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* @return
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* - -EINVAL if the parameters are invalid.
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* - -ENOENT if the key is not found.
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* - A positive value that can be used by the caller as an offset into an
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* array of user data. This value is unique for this key, and is the same
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* value that was returned when the key was added.
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*/
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int32_t
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rte_hash_del_key_with_hash(const struct rte_hash *h, const void *key, hash_sig_t sig);
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/**
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* Find a key in the hash table given the position.
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* This operation is multi-thread safe.
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*
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* @param h
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* Hash table to get the key from.
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* @param position
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* Position returned when the key was inserted.
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* @param key
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* Output containing a pointer to the key
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* @return
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* - 0 if retrieved successfully
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* - -EINVAL if the parameters are invalid.
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* - -ENOENT if no valid key is found in the given position.
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*/
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int
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rte_hash_get_key_with_position(const struct rte_hash *h, const int32_t position,
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void **key);
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/**
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* Find a key-value pair in the hash table.
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* This operation is multi-thread safe.
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*
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* @param h
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* Hash table to look in.
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* @param key
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* Key to find.
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* @param data
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* Output with pointer to data returned from the hash table.
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* @return
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* - A positive value that can be used by the caller as an offset into an
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* array of user data. This value is unique for this key, and is the same
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* value that was returned when the key was added.
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* - -EINVAL if the parameters are invalid.
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* - -ENOENT if the key is not found.
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*/
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int
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rte_hash_lookup_data(const struct rte_hash *h, const void *key, void **data);
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/**
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* Find a key-value pair with a pre-computed hash value
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* to an existing hash table.
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* This operation is multi-thread safe.
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*
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* @param h
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* Hash table to look in.
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* @param key
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* Key to find.
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* @param sig
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* Precomputed hash value for 'key'
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* @param data
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* Output with pointer to data returned from the hash table.
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* @return
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* - A positive value that can be used by the caller as an offset into an
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* array of user data. This value is unique for this key, and is the same
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* value that was returned when the key was added.
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* - -EINVAL if the parameters are invalid.
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* - -ENOENT if the key is not found.
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*/
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int
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rte_hash_lookup_with_hash_data(const struct rte_hash *h, const void *key,
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hash_sig_t sig, void **data);
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/**
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* Find a key in the hash table.
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* This operation is multi-thread safe.
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*
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* @param h
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* Hash table to look in.
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* @param key
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* Key to find.
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* @return
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* - -EINVAL if the parameters are invalid.
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* - -ENOENT if the key is not found.
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* - A positive value that can be used by the caller as an offset into an
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* array of user data. This value is unique for this key, and is the same
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* value that was returned when the key was added.
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*/
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int32_t
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rte_hash_lookup(const struct rte_hash *h, const void *key);
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/**
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* Find a key in the hash table.
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* This operation is multi-thread safe.
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*
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* @param h
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* Hash table to look in.
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* @param key
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* Key to find.
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* @param sig
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* Hash value to remove from the hash table.
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* @return
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* - -EINVAL if the parameters are invalid.
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* - -ENOENT if the key is not found.
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* - A positive value that can be used by the caller as an offset into an
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* array of user data. This value is unique for this key, and is the same
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* value that was returned when the key was added.
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*/
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int32_t
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rte_hash_lookup_with_hash(const struct rte_hash *h,
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const void *key, hash_sig_t sig);
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/**
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* Calc a hash value by key.
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* This operation is not multi-thread safe.
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*
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* @param h
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* Hash table to look in.
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* @param key
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* Key to find.
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* @return
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* - hash value
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*/
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hash_sig_t
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rte_hash_hash(const struct rte_hash *h, const void *key);
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/**
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* Find multiple keys in the hash table.
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* This operation is multi-thread safe.
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*
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* @param h
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* Hash table to look in.
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* @param keys
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* A pointer to a list of keys to look for.
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* @param num_keys
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* How many keys are in the keys list (less than RTE_HASH_LOOKUP_BULK_MAX).
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* @param hit_mask
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* Output containing a bitmask with all successful lookups.
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* @param data
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* Output containing array of data returned from all the successful lookups.
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* @return
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* -EINVAL if there's an error, otherwise number of successful lookups.
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*/
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int
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rte_hash_lookup_bulk_data(const struct rte_hash *h, const void **keys,
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uint32_t num_keys, uint64_t *hit_mask, void *data[]);
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/**
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* Find multiple keys in the hash table.
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* This operation is multi-thread safe.
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*
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* @param h
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* Hash table to look in.
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* @param keys
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* A pointer to a list of keys to look for.
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* @param num_keys
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* How many keys are in the keys list (less than RTE_HASH_LOOKUP_BULK_MAX).
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* @param positions
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* Output containing a list of values, corresponding to the list of keys that
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* can be used by the caller as an offset into an array of user data. These
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* values are unique for each key, and are the same values that were returned
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* when each key was added. If a key in the list was not found, then -ENOENT
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* will be the value.
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* @return
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* -EINVAL if there's an error, otherwise 0.
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*/
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int
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rte_hash_lookup_bulk(const struct rte_hash *h, const void **keys,
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uint32_t num_keys, int32_t *positions);
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/**
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* Iterate through the hash table, returning key-value pairs.
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*
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* @param h
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* Hash table to iterate
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* @param key
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* Output containing the key where current iterator
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* was pointing at
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* @param data
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* Output containing the data associated with key.
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* Returns NULL if data was not stored.
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* @param next
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* Pointer to iterator. Should be 0 to start iterating the hash table.
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* Iterator is incremented after each call of this function.
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* @return
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* Position where key was stored, if successful.
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* - -EINVAL if the parameters are invalid.
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* - -ENOENT if end of the hash table.
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*/
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int32_t
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rte_hash_iterate(const struct rte_hash *h, const void **key, void **data, uint32_t *next);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RTE_HASH_H_ */
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