#include <vppinfra/heap.h>
#include <vppinfra/format.h>
#include <vppinfra/pool.h>
+#include <vppinfra/cache.h>
+#include <vppinfra/lock.h>
#ifndef BIHASH_TYPE
#error BIHASH_TYPE not defined
};
} BVT (clib_bihash_value);
-/*
- * This is shared across all uses of the template, so it needs
- * a "personal" #include recursion block
- */
-#ifndef __defined_clib_bihash_bucket_t__
-#define __defined_clib_bihash_bucket_t__
+#define BIHASH_BUCKET_OFFSET_BITS 36
+
typedef struct
{
union
{
struct
{
- u32 offset;
- u8 pad[3];
- u8 log2_pages;
+ u64 offset:BIHASH_BUCKET_OFFSET_BITS;
+ u64 lock:1;
+ u64 linear_search:1;
+ u64 log2_pages:8;
+ i64 refcnt:16;
};
u64 as_u64;
};
-} clib_bihash_bucket_t;
-#endif /* __defined_clib_bihash_bucket_t__ */
+} BVT (clib_bihash_bucket);
+
+STATIC_ASSERT_SIZEOF (BVT (clib_bihash_bucket), sizeof (u64));
typedef struct
{
BVT (clib_bihash_value) * values;
- clib_bihash_bucket_t *buckets;
- volatile u32 *writer_lock;
+ BVT (clib_bihash_bucket) * buckets;
+ volatile u32 *alloc_lock;
BVT (clib_bihash_value) ** working_copies;
- clib_bihash_bucket_t saved_bucket;
+ int *working_copy_lengths;
+ BVT (clib_bihash_bucket) saved_bucket;
u32 nbuckets;
u32 log2_nbuckets;
u8 *name;
+ u64 cache_hits;
+ u64 cache_misses;
+
BVT (clib_bihash_value) ** freelists;
- void *mheap;
+
+ /*
+ * Backing store allocation. Since bihash manages its own
+ * freelists, we simple dole out memory at alloc_arena_next.
+ */
+ uword alloc_arena;
+ uword alloc_arena_next;
+ uword alloc_arena_size;
+
+ /**
+ * A custom format function to print the Key and Value of bihash_key instead of default hexdump
+ */
+ format_function_t *fmt_fn;
} BVT (clib_bihash);
+static inline void BV (clib_bihash_alloc_lock) (BVT (clib_bihash) * h)
+{
+ while (__atomic_test_and_set (h->alloc_lock, __ATOMIC_ACQUIRE))
+ CLIB_PAUSE ();
+}
+
+static inline void BV (clib_bihash_alloc_unlock) (BVT (clib_bihash) * h)
+{
+ __atomic_clear (h->alloc_lock, __ATOMIC_RELEASE);
+}
+
+static inline void BV (clib_bihash_lock_bucket) (BVT (clib_bihash_bucket) * b)
+{
+ BVT (clib_bihash_bucket) unlocked_bucket, locked_bucket;
+
+ do
+ {
+ locked_bucket.as_u64 = unlocked_bucket.as_u64 = b->as_u64;
+ unlocked_bucket.lock = 0;
+ locked_bucket.lock = 1;
+ CLIB_PAUSE ();
+ }
+ while (__atomic_compare_exchange_n (&b->as_u64, &unlocked_bucket.as_u64,
+ locked_bucket.as_u64, 1 /* weak */ ,
+ __ATOMIC_ACQUIRE,
+ __ATOMIC_ACQUIRE) == 0);
+}
+
+static inline void BV (clib_bihash_unlock_bucket)
+ (BVT (clib_bihash_bucket) * b)
+{
+ CLIB_MEMORY_BARRIER ();
+ b->lock = 0;
+}
-static inline void *BV (clib_bihash_get_value) (const BVT (clib_bihash) * h,
+static inline void *BV (clib_bihash_get_value) (BVT (clib_bihash) * h,
uword offset)
{
- u8 *hp = h->mheap;
+ u8 *hp = (u8 *) h->alloc_arena;
u8 *vp = hp + offset;
return (void *) vp;
}
-static inline uword BV (clib_bihash_get_offset) (const BVT (clib_bihash) * h,
+static inline int BV (clib_bihash_bucket_is_empty)
+ (BVT (clib_bihash_bucket) * b)
+{
+ /* Note: applied to locked buckets, test offset */
+ return b->offset == 0;
+}
+
+static inline uword BV (clib_bihash_get_offset) (BVT (clib_bihash) * h,
void *v)
{
u8 *hp, *vp;
- hp = (u8 *) h->mheap;
+ hp = (u8 *) h->alloc_arena;
vp = (u8 *) v;
- ASSERT ((vp - hp) < 0x100000000ULL);
return vp - hp;
}
void BV (clib_bihash_init)
(BVT (clib_bihash) * h, char *name, u32 nbuckets, uword memory_size);
+void BV (clib_bihash_set_kvp_format_fn) (BVT (clib_bihash) * h,
+ format_function_t * fmt_fn);
+
void BV (clib_bihash_free) (BVT (clib_bihash) * h);
int BV (clib_bihash_add_del) (BVT (clib_bihash) * h,
BVT (clib_bihash_kv) * add_v, int is_add);
-int BV (clib_bihash_search) (const BVT (clib_bihash) * h,
+int BV (clib_bihash_search) (BVT (clib_bihash) * h,
BVT (clib_bihash_kv) * search_v,
BVT (clib_bihash_kv) * return_v);
format_function_t BV (format_bihash);
format_function_t BV (format_bihash_kvp);
+format_function_t BV (format_bihash_lru);
-
-static inline int BV (clib_bihash_search_inline)
- (const BVT (clib_bihash) * h, BVT (clib_bihash_kv) * kvp)
+static inline int BV (clib_bihash_search_inline_with_hash)
+ (BVT (clib_bihash) * h, u64 hash, BVT (clib_bihash_kv) * key_result)
{
- u64 hash;
u32 bucket_index;
- uword value_index;
BVT (clib_bihash_value) * v;
- clib_bihash_bucket_t *b;
- int i;
-
- hash = BV (clib_bihash_hash) (kvp);
+ BVT (clib_bihash_bucket) * b;
+ int i, limit;
bucket_index = hash & (h->nbuckets - 1);
b = &h->buckets[bucket_index];
- if (b->offset == 0)
+ if (PREDICT_FALSE (BV (clib_bihash_bucket_is_empty) (b)))
return -1;
+ if (PREDICT_FALSE (b->lock))
+ {
+ volatile BVT (clib_bihash_bucket) * bv = b;
+ while (bv->lock)
+ CLIB_PAUSE ();
+ }
+
hash >>= h->log2_nbuckets;
v = BV (clib_bihash_get_value) (h, b->offset);
- value_index = hash & ((1 << b->log2_pages) - 1);
- v += value_index;
- for (i = 0; i < BIHASH_KVP_PER_PAGE; i++)
+ /* If the bucket has unresolvable collisions, use linear search */
+ limit = BIHASH_KVP_PER_PAGE;
+ v += (b->linear_search == 0) ? hash & ((1 << b->log2_pages) - 1) : 0;
+ if (PREDICT_FALSE (b->linear_search))
+ limit <<= b->log2_pages;
+
+ for (i = 0; i < limit; i++)
{
- if (BV (clib_bihash_key_compare) (v->kvp[i].key, kvp->key))
+ if (BV (clib_bihash_key_compare) (v->kvp[i].key, key_result->key))
{
- *kvp = v->kvp[i];
+ *key_result = v->kvp[i];
return 0;
}
}
return -1;
}
-static inline int BV (clib_bihash_search_inline_2)
- (const BVT (clib_bihash) * h,
- BVT (clib_bihash_kv) * search_key, BVT (clib_bihash_kv) * valuep)
+static inline int BV (clib_bihash_search_inline)
+ (BVT (clib_bihash) * h, BVT (clib_bihash_kv) * key_result)
{
u64 hash;
+
+ hash = BV (clib_bihash_hash) (key_result);
+
+ return BV (clib_bihash_search_inline_with_hash) (h, hash, key_result);
+}
+
+static inline void BV (clib_bihash_prefetch_bucket)
+ (BVT (clib_bihash) * h, u64 hash)
+{
+ u32 bucket_index;
+ BVT (clib_bihash_bucket) * b;
+
+ bucket_index = hash & (h->nbuckets - 1);
+ b = &h->buckets[bucket_index];
+
+ CLIB_PREFETCH (b, CLIB_CACHE_LINE_BYTES, READ);
+}
+
+static inline void BV (clib_bihash_prefetch_data)
+ (BVT (clib_bihash) * h, u64 hash)
+{
u32 bucket_index;
- uword value_index;
BVT (clib_bihash_value) * v;
- clib_bihash_bucket_t *b;
- int i;
+ BVT (clib_bihash_bucket) * b;
- ASSERT (valuep);
+ bucket_index = hash & (h->nbuckets - 1);
+ b = &h->buckets[bucket_index];
- hash = BV (clib_bihash_hash) (search_key);
+ if (PREDICT_FALSE (BV (clib_bihash_bucket_is_empty) (b)))
+ return;
+
+ hash >>= h->log2_nbuckets;
+ v = BV (clib_bihash_get_value) (h, b->offset);
+
+ v += (b->linear_search == 0) ? hash & ((1 << b->log2_pages) - 1) : 0;
+
+ CLIB_PREFETCH (v, CLIB_CACHE_LINE_BYTES, READ);
+}
+
+static inline int BV (clib_bihash_search_inline_2_with_hash)
+ (BVT (clib_bihash) * h,
+ u64 hash, BVT (clib_bihash_kv) * search_key, BVT (clib_bihash_kv) * valuep)
+{
+ u32 bucket_index;
+ BVT (clib_bihash_value) * v;
+ BVT (clib_bihash_bucket) * b;
+ int i, limit;
+
+ ASSERT (valuep);
bucket_index = hash & (h->nbuckets - 1);
b = &h->buckets[bucket_index];
- if (b->offset == 0)
+ if (PREDICT_FALSE (BV (clib_bihash_bucket_is_empty) (b)))
return -1;
- hash >>= h->log2_nbuckets;
+ if (PREDICT_FALSE (b->lock))
+ {
+ volatile BVT (clib_bihash_bucket) * bv = b;
+ while (bv->lock)
+ CLIB_PAUSE ();
+ }
+ hash >>= h->log2_nbuckets;
v = BV (clib_bihash_get_value) (h, b->offset);
- value_index = hash & ((1 << b->log2_pages) - 1);
- v += value_index;
- for (i = 0; i < BIHASH_KVP_PER_PAGE; i++)
+ /* If the bucket has unresolvable collisions, use linear search */
+ limit = BIHASH_KVP_PER_PAGE;
+ v += (b->linear_search == 0) ? hash & ((1 << b->log2_pages) - 1) : 0;
+ if (PREDICT_FALSE (b->linear_search))
+ limit <<= b->log2_pages;
+
+ for (i = 0; i < limit; i++)
{
if (BV (clib_bihash_key_compare) (v->kvp[i].key, search_key->key))
{
return -1;
}
+static inline int BV (clib_bihash_search_inline_2)
+ (BVT (clib_bihash) * h,
+ BVT (clib_bihash_kv) * search_key, BVT (clib_bihash_kv) * valuep)
+{
+ u64 hash;
+
+ hash = BV (clib_bihash_hash) (search_key);
+
+ return BV (clib_bihash_search_inline_2_with_hash) (h, hash, search_key,
+ valuep);
+}
+
#endif /* __included_bihash_template_h__ */