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Diffstat (limited to 'vpp/vppinfra/vppinfra/bihash_template.h')
| -rw-r--r-- | vpp/vppinfra/vppinfra/bihash_template.h | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/vpp/vppinfra/vppinfra/bihash_template.h b/vpp/vppinfra/vppinfra/bihash_template.h new file mode 100644 index 00000000..f70190c6 --- /dev/null +++ b/vpp/vppinfra/vppinfra/bihash_template.h @@ -0,0 +1,214 @@ +/* + Copyright (c) 2014 Cisco and/or its affiliates. + + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. +*/ + +/** @cond DOCUMENTATION_IS_IN_BIHASH_DOC_H */ + +/* + * Note: to instantiate the template multiple times in a single file, + * #undef __included_bihash_template_h__... + */ +#ifndef __included_bihash_template_h__ +#define __included_bihash_template_h__ + +#include <vppinfra/heap.h> +#include <vppinfra/format.h> +#include <vppinfra/pool.h> + +#ifndef BIHASH_TYPE +#error BIHASH_TYPE not defined +#endif + +#define _bv(a,b) a##b +#define __bv(a,b) _bv(a,b) +#define BV(a) __bv(a,BIHASH_TYPE) + +#define _bvt(a,b) a##b##_t +#define __bvt(a,b) _bvt(a,b) +#define BVT(a) __bvt(a,BIHASH_TYPE) + +typedef struct BV (clib_bihash_value) +{ + union + { + BVT (clib_bihash_kv) kvp[BIHASH_KVP_PER_PAGE]; + struct BV (clib_bihash_value) * next_free; + }; +} 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__ +typedef struct +{ + union + { + struct + { + u32 offset; + u8 pad[3]; + u8 log2_pages; + }; + u64 as_u64; + }; +} clib_bihash_bucket_t; +#endif /* __defined_clib_bihash_bucket_t__ */ + +typedef struct +{ + BVT (clib_bihash_value) * values; + clib_bihash_bucket_t *buckets; + volatile u32 *writer_lock; + + BVT (clib_bihash_value) ** working_copies; + clib_bihash_bucket_t saved_bucket; + + u32 nbuckets; + u32 log2_nbuckets; + u8 *name; + + BVT (clib_bihash_value) ** freelists; + void *mheap; + +} BVT (clib_bihash); + + +static inline void *BV (clib_bihash_get_value) (const BVT (clib_bihash) * h, + uword offset) +{ + u8 *hp = h->mheap; + u8 *vp = hp + offset; + + return (void *) vp; +} + +static inline uword BV (clib_bihash_get_offset) (const BVT (clib_bihash) * h, + void *v) +{ + u8 *hp, *vp; + + hp = (u8 *) h->mheap; + 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_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, + BVT (clib_bihash_kv) * search_v, + BVT (clib_bihash_kv) * return_v); + +void BV (clib_bihash_foreach_key_value_pair) (BVT (clib_bihash) * h, + void *callback, void *arg); + +format_function_t BV (format_bihash); +format_function_t BV (format_bihash_kvp); + + +static inline int BV (clib_bihash_search_inline) + (const BVT (clib_bihash) * h, BVT (clib_bihash_kv) * kvp) +{ + 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); + + bucket_index = hash & (h->nbuckets - 1); + b = &h->buckets[bucket_index]; + + if (b->offset == 0) + return -1; + + 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 (BV (clib_bihash_key_compare) (v->kvp[i].key, kvp->key)) + { + *kvp = 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) +{ + u64 hash; + u32 bucket_index; + uword value_index; + BVT (clib_bihash_value) * v; + clib_bihash_bucket_t *b; + int i; + + ASSERT (valuep); + + hash = BV (clib_bihash_hash) (search_key); + + bucket_index = hash & (h->nbuckets - 1); + b = &h->buckets[bucket_index]; + + if (b->offset == 0) + return -1; + + 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 (BV (clib_bihash_key_compare) (v->kvp[i].key, search_key->key)) + { + *valuep = v->kvp[i]; + return 0; + } + } + return -1; +} + + +#endif /* __included_bihash_template_h__ */ + +/** @endcond */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |