lbhash.h File Reference

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Data Structures
struct	lb_hash_bucket_t
struct	lb_hash_t

Macros
#define	LBHASH_ENTRY_PER_BUCKET   4
	vppinfra already includes tons of different hash tables. More...
#define	LB_HASH_DO_NOT_USE_SSE_BUCKETS   0
#define	lb_hash_nbuckets(h)   (((h)->buckets_mask) + 1)
#define	lb_hash_size(h)   ((h)->buckets_mask + LBHASH_ENTRY_PER_BUCKET)
#define	lb_hash_foreach_bucket(h, bucket)
#define	lb_hash_foreach_entry(h, bucket, i)
#define	lb_hash_foreach_valid_entry(h, bucket, i, now)

Functions
static_always_inline lb_hash_t *	lb_hash_alloc (u32 buckets, u32 timeout)
static_always_inline void	lb_hash_free (lb_hash_t *h)
static_always_inline void	lb_hash_prefetch_bucket (lb_hash_t *ht, u32 hash)
static_always_inline void	lb_hash_get (lb_hash_t *ht, u32 hash, u32 vip, u32 time_now, u32 *available_index, u32 *found_value)
static_always_inline u32	lb_hash_available_value (lb_hash_t *h, u32 hash, u32 available_index)
static_always_inline void	lb_hash_put (lb_hash_t *h, u32 hash, u32 value, u32 vip, u32 available_index, u32 time_now)
static_always_inline u32	lb_hash_elts (lb_hash_t *h, u32 time_now)

Macro Definition Documentation

LB_HASH_DO_NOT_USE_SSE_BUCKETS

#define LB_HASH_DO_NOT_USE_SSE_BUCKETS   0

Definition at line 44 of file lbhash.h.

lb_hash_foreach_bucket

#define lb_hash_foreach_bucket	(		h,
			bucket
	)

Value:

for (bucket = (h)->buckets; \
        bucket < (h)->buckets + lb_hash_nbuckets(h); \
        bucket++)

Definition at line 67 of file lbhash.h.

lb_hash_foreach_entry

#define lb_hash_foreach_entry	(		h,
			bucket,
			i
	)

Value:

lb_hash_foreach_bucket(h, bucket) \
      for (i = 0; i < LBHASH_ENTRY_PER_BUCKET; i++)

Definition at line 72 of file lbhash.h.

lb_hash_foreach_valid_entry

#define lb_hash_foreach_valid_entry	(		h,
			bucket,
			i,
			now
	)

Value:

lb_hash_foreach_entry(h, bucket, i) \
       if (!clib_u32_loop_gt((now), bucket->timeout[i]))

Definition at line 76 of file lbhash.h.

lb_hash_nbuckets

#define lb_hash_nbuckets

(

h

)

(((h)->buckets_mask) + 1)

Definition at line 64 of file lbhash.h.

lb_hash_size

#define lb_hash_size

(

h

)

((h)->buckets_mask + LBHASH_ENTRY_PER_BUCKET)

Definition at line 65 of file lbhash.h.

LBHASH_ENTRY_PER_BUCKET

#define LBHASH_ENTRY_PER_BUCKET   4

vppinfra already includes tons of different hash tables.

MagLev flow table is a bit different. It has to be very efficient for both writing and reading operations. But it does not need to be 100% reliable (write can fail). It also needs to recycle old entries in a lazy way.

This hash table is the most dummy hash table you can do. Fixed total size, fixed bucket size. Advantage is that it could be very efficient (maybe).

Definition at line 42 of file lbhash.h.

Function Documentation

lb_hash_alloc()

static_always_inline lb_hash_t* lb_hash_alloc	(	u32	buckets,
		u32	timeout
	)

Definition at line 81 of file lbhash.h.

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lb_hash_available_value()

static_always_inline u32 lb_hash_available_value	(	lb_hash_t *	h,
		u32	hash,
		u32	available_index
	)

Definition at line 168 of file lbhash.h.

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lb_hash_elts()

static_always_inline u32 lb_hash_elts	(	lb_hash_t *	h,
		u32	time_now
	)

Definition at line 185 of file lbhash.h.

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lb_hash_free()

static_always_inline void lb_hash_free

(

lb_hash_t *

h

)

Definition at line 99 of file lbhash.h.

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lb_hash_get()

static_always_inline void lb_hash_get	(	lb_hash_t *	ht,
		u32	hash,
		u32	vip,
		u32	time_now,
		u32 *	available_index,
		u32 *	found_value
	)

Definition at line 113 of file lbhash.h.

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lb_hash_prefetch_bucket()

static_always_inline void lb_hash_prefetch_bucket	(	lb_hash_t *	ht,
		u32	hash
	)

Definition at line 106 of file lbhash.h.

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lb_hash_put()

static_always_inline void lb_hash_put	(	lb_hash_t *	h,
		u32	hash,
		u32	value,
		u32	vip,
		u32	available_index,
		u32	time_now
	)

Definition at line 174 of file lbhash.h.

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