#include <stdint.h>
#include <errno.h>
#include <sys/queue.h>
#include <string.h>
#include <rte_jhash.h>

Data Structures
struct	rte_fbk_hash_params
union	rte_fbk_hash_entry
struct	rte_fbk_hash_table

Macros
#define	RTE_FBK_HASH_INIT_VAL_DEFAULT 0xFFFFFFFF
#define	RTE_FBK_HASH_ENTRIES_MAX (1 << 20)
#define	RTE_FBK_HASH_ENTRIES_PER_BUCKET_MAX 256
#define	RTE_FBK_HASH_NAMESIZE 32

Typedefs
typedef uint32_t(*	rte_fbk_hash_fn )(uint32_t key, uint32_t init_val)

Functions
static uint32_t	rte_fbk_hash_get_bucket (const struct rte_fbk_hash_table *ht, uint32_t key)
static int	rte_fbk_hash_add_key_with_bucket (struct rte_fbk_hash_table *ht, uint32_t key, uint16_t value, uint32_t bucket)
static int	rte_fbk_hash_add_key (struct rte_fbk_hash_table *ht, uint32_t key, uint16_t value)
static int	rte_fbk_hash_delete_key_with_bucket (struct rte_fbk_hash_table *ht, uint32_t key, uint32_t bucket)
static int	rte_fbk_hash_delete_key (struct rte_fbk_hash_table *ht, uint32_t key)
static int	rte_fbk_hash_lookup_with_bucket (const struct rte_fbk_hash_table *ht, uint32_t key, uint32_t bucket)
static int	rte_fbk_hash_lookup (const struct rte_fbk_hash_table *ht, uint32_t key)
static void	rte_fbk_hash_clear_all (struct rte_fbk_hash_table *ht)
static double	rte_fbk_hash_get_load_factor (struct rte_fbk_hash_table *ht)
struct rte_fbk_hash_table *	rte_fbk_hash_find_existing (const char *name)
struct rte_fbk_hash_table *	rte_fbk_hash_create (const struct rte_fbk_hash_params *params)
void	rte_fbk_hash_free (struct rte_fbk_hash_table *ht)

Detailed Description

This is a hash table implementation for four byte keys (fbk).

Note that the return value of the add function should always be checked as, if a bucket is full, the key is not added even if there is space in other buckets. This keeps the lookup function very simple and therefore fast.

Macro Definition Documentation

#define RTE_FBK_HASH_ENTRIES_MAX (1 << 20)

The maximum number of entries in the hash table that is supported.

#define RTE_FBK_HASH_ENTRIES_PER_BUCKET_MAX 256

The maximum number of entries in each bucket that is supported.

#define RTE_FBK_HASH_INIT_VAL_DEFAULT 0xFFFFFFFF

Initialising value used when calculating hash.

#define RTE_FBK_HASH_NAMESIZE 32

Maximum size of string for naming the hash.

Typedef Documentation

typedef uint32_t(* rte_fbk_hash_fn)(uint32_t key, uint32_t init_val)

Type of function that can be used for calculating the hash value.

Function Documentation

static int rte_fbk_hash_add_key	(	struct rte_fbk_hash_table *	ht,
		uint32_t	key,
		uint16_t	value
	)

inlinestatic

Add a key to an existing hash table. This operation is not multi-thread safe and should only be called from one thread.

Parameters

ht	Hash table to add the key to.
key	Key to add to the hash table.
value	Value to associate with key.

Returns: 0 if ok, or negative value on error.

static int rte_fbk_hash_add_key_with_bucket	(	struct rte_fbk_hash_table *	ht,
		uint32_t	key,
		uint16_t	value,
		uint32_t	bucket
	)

inlinestatic

Add a key to an existing hash table with bucket id. This operation is not multi-thread safe and should only be called from one thread.

Parameters

ht	Hash table to add the key to.
key	Key to add to the hash table.
value	Value to associate with key.
bucket	Bucket to associate with key.

Returns: 0 if ok, or negative value on error.

static void rte_fbk_hash_clear_all ( struct rte_fbk_hash_table * ht )

inlinestatic

Delete all entries in a hash table. This operation is not multi-thread safe and should only be called from one thread.

Parameters

ht	Hash table to delete entries in.

struct rte_fbk_hash_table* rte_fbk_hash_create ( const struct rte_fbk_hash_params * params )

read

Create a new hash table for use with four byte keys.

Parameters

params Parameters used in creation of hash table.

Returns

Pointer to hash table structure that is used in future hash table operations, or NULL on error with rte_errno set appropriately. Possible rte_errno error values include:

E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
E_RTE_SECONDARY - function was called from a secondary process instance
EINVAL - invalid parameter value passed to function
ENOSPC - the maximum number of memzones has already been allocated
EEXIST - a memzone with the same name already exists
ENOMEM - no appropriate memory area found in which to create memzone

static int rte_fbk_hash_delete_key	(	struct rte_fbk_hash_table *	ht,
		uint32_t	key
	)

inlinestatic

Remove a key from an existing hash table. This operation is not multi-thread safe and should only be called from one thread.

Parameters

ht	Hash table to remove the key from.
key	Key to remove from the hash table.

Returns: 0 if ok, or negative value on error.

static int rte_fbk_hash_delete_key_with_bucket	(	struct rte_fbk_hash_table *	ht,
		uint32_t	key,
		uint32_t	bucket
	)

inlinestatic

Remove a key with a given bucket id from an existing hash table. This operation is not multi-thread safe and should only be called from one thread.

Parameters

ht	Hash table to remove the key from.
key	Key to remove from the hash table.
bucket	Bucket id associate with key.

Returns: 0 if ok, or negative value on error.

struct rte_fbk_hash_table* rte_fbk_hash_find_existing ( const char * name )

read

Performs a lookup for an existing hash table, and returns a pointer to the table if found.

Parameters

name	Name of the hash table to find

Returns

pointer to hash table structure or NULL on error with rte_errno set appropriately. Possible rte_errno values include:

ENOENT - required entry not available to return.

void rte_fbk_hash_free ( struct rte_fbk_hash_table * ht )

Free all memory used by a hash table. Has no effect on hash tables allocated in memory zones

Parameters

ht	Hash table to deallocate.

static uint32_t rte_fbk_hash_get_bucket	(	const struct rte_fbk_hash_table *	ht,
		uint32_t	key
	)

inlinestatic

Find the offset into hash table of the bucket containing a particular key.

Parameters

ht	Pointer to hash table.
key	Key to calculate bucket for.

Returns: Offset into hash table.

static double rte_fbk_hash_get_load_factor ( struct rte_fbk_hash_table * ht )

inlinestatic

Find what fraction of entries are being used.

Parameters

ht	Hash table to find how many entries are being used in.

Returns: Load factor of the hash table, or negative value on error.

static int rte_fbk_hash_lookup	(	const struct rte_fbk_hash_table *	ht,
		uint32_t	key
	)

inlinestatic

Find a key in the hash table. This operation is multi-thread safe.

Parameters

ht	Hash table to look in.
key	Key to find.

Returns: The value that was associated with the key, or negative value on error.

static int rte_fbk_hash_lookup_with_bucket	(	const struct rte_fbk_hash_table *	ht,
		uint32_t	key,
		uint32_t	bucket
	)

inlinestatic

Find a key in the hash table with a given bucketid. This operation is multi-thread safe.

Parameters

ht	Hash table to look in.
key	Key to find.
bucket	Bucket associate to the key.

Returns: The value that was associated with the key, or negative value on error.

Data Structures

Macros

Typedefs

Functions

Detailed Description

Macro Definition Documentation

Typedef Documentation

Function Documentation