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-rw-r--r--src/vppinfra/bihash_template.h206
1 files changed, 183 insertions, 23 deletions
diff --git a/src/vppinfra/bihash_template.h b/src/vppinfra/bihash_template.h
index 4ea14ff0267..feb6fb68797 100644
--- a/src/vppinfra/bihash_template.h
+++ b/src/vppinfra/bihash_template.h
@@ -48,12 +48,10 @@ typedef struct BV (clib_bihash_value)
};
} 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__
+#if BIHASH_KVP_CACHE_SIZE > 5
+#error Requested KVP cache LRU data exceeds 16 bits
+#endif
+
typedef struct
{
union
@@ -62,36 +60,139 @@ typedef struct
{
u32 offset;
u8 linear_search;
- u8 pad[2];
u8 log2_pages;
+ u16 cache_lru;
};
u64 as_u64;
};
-} clib_bihash_bucket_t;
-#endif /* __defined_clib_bihash_bucket_t__ */
+ BVT (clib_bihash_kv) cache[BIHASH_KVP_CACHE_SIZE];
+} BVT (clib_bihash_bucket);
typedef struct
{
BVT (clib_bihash_value) * values;
- clib_bihash_bucket_t *buckets;
+ BVT (clib_bihash_bucket) * buckets;
volatile u32 *writer_lock;
BVT (clib_bihash_value) ** working_copies;
int *working_copy_lengths;
- clib_bihash_bucket_t saved_bucket;
+ BVT (clib_bihash_bucket) saved_bucket;
u32 nbuckets;
u32 log2_nbuckets;
u32 linear_buckets;
u8 *name;
+ u64 cache_hits;
+ u64 cache_misses;
+
BVT (clib_bihash_value) ** freelists;
void *mheap;
} BVT (clib_bihash);
-static inline void *BV (clib_bihash_get_value) (const BVT (clib_bihash) * h,
+static inline void
+BV (clib_bihash_update_lru) (BVT (clib_bihash_bucket) * b, u8 slot)
+{
+ u16 value, tmp, mask;
+ u8 found_lru_pos;
+ u16 save_hi;
+
+ if (BIHASH_KVP_CACHE_SIZE < 2)
+ return;
+
+ ASSERT (slot < BIHASH_KVP_CACHE_SIZE);
+
+ /* First, find the slot in cache_lru */
+ mask = slot;
+ if (BIHASH_KVP_CACHE_SIZE > 1)
+ mask |= slot << 3;
+ if (BIHASH_KVP_CACHE_SIZE > 2)
+ mask |= slot << 6;
+ if (BIHASH_KVP_CACHE_SIZE > 3)
+ mask |= slot << 9;
+ if (BIHASH_KVP_CACHE_SIZE > 4)
+ mask |= slot << 12;
+
+ value = b->cache_lru;
+ tmp = value ^ mask;
+
+ /* Already the most-recently used? */
+ if ((tmp & 7) == 0)
+ return;
+
+ found_lru_pos = ((tmp & (7 << 3)) == 0) ? 1 : 0;
+ if (BIHASH_KVP_CACHE_SIZE > 2)
+ found_lru_pos = ((tmp & (7 << 6)) == 0) ? 2 : found_lru_pos;
+ if (BIHASH_KVP_CACHE_SIZE > 3)
+ found_lru_pos = ((tmp & (7 << 9)) == 0) ? 3 : found_lru_pos;
+ if (BIHASH_KVP_CACHE_SIZE > 4)
+ found_lru_pos = ((tmp & (7 << 12)) == 0) ? 4 : found_lru_pos;
+
+ ASSERT (found_lru_pos);
+
+ /* create a mask to kill bits in or above slot */
+ mask = 0xFFFF << found_lru_pos;
+ mask <<= found_lru_pos;
+ mask <<= found_lru_pos;
+ mask ^= 0xFFFF;
+ tmp = value & mask;
+
+ /* Save bits above slot */
+ mask ^= 0xFFFF;
+ mask <<= 3;
+ save_hi = value & mask;
+
+ value = save_hi | (tmp << 3) | slot;
+
+ b->cache_lru = value;
+}
+
+void
+BV (clib_bihash_update_lru_not_inline) (BVT (clib_bihash_bucket) * b,
+ u8 slot);
+
+static inline u8 BV (clib_bihash_get_lru) (BVT (clib_bihash_bucket) * b)
+{
+ return (b->cache_lru >> (3 * (BIHASH_KVP_CACHE_SIZE - 1))) & 7;
+}
+
+static inline void BV (clib_bihash_reset_cache) (BVT (clib_bihash_bucket) * b)
+{
+ u16 initial_lru_value;
+
+ memset (b->cache, 0xff, sizeof (b->cache));
+
+ /*
+ * We'll want the cache to be loaded from slot 0 -> slot N, so
+ * the initial LRU order is reverse index order.
+ */
+ if (BIHASH_KVP_CACHE_SIZE == 1)
+ initial_lru_value = 0;
+ else if (BIHASH_KVP_CACHE_SIZE == 2)
+ initial_lru_value = (0 << 3) | (1 << 0);
+ else if (BIHASH_KVP_CACHE_SIZE == 3)
+ initial_lru_value = (0 << 6) | (1 << 3) | (2 << 0);
+ else if (BIHASH_KVP_CACHE_SIZE == 4)
+ initial_lru_value = (0 << 9) | (1 << 6) | (2 << 3) | (3 << 0);
+ else if (BIHASH_KVP_CACHE_SIZE == 5)
+ initial_lru_value = (0 << 12) | (1 << 9) | (2 << 6) | (3 << 3) | (4 << 0);
+
+ b->cache_lru = initial_lru_value;
+}
+
+static inline void BV (clib_bihash_cache_enable_disable)
+ (BVT (clib_bihash_bucket) * b, u8 enable)
+{
+ BVT (clib_bihash_bucket) tmp_b;
+ tmp_b.as_u64 = b->as_u64;
+ tmp_b.cache_lru &= 0x7FFF;
+ tmp_b.cache_lru |= enable << 15;
+ b->as_u64 = tmp_b.as_u64;
+}
+
+static inline void *BV (clib_bihash_get_value) (BVT (clib_bihash) * h,
uword offset)
{
u8 *hp = h->mheap;
@@ -100,7 +201,7 @@ static inline void *BV (clib_bihash_get_value) (const BVT (clib_bihash) * h,
return (void *) vp;
}
-static inline uword BV (clib_bihash_get_offset) (const BVT (clib_bihash) * h,
+static inline uword BV (clib_bihash_get_offset) (BVT (clib_bihash) * h,
void *v)
{
u8 *hp, *vp;
@@ -119,7 +220,7 @@ 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);
@@ -128,18 +229,19 @@ void BV (clib_bihash_foreach_key_value_pair) (BVT (clib_bihash) * h,
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)
+ (BVT (clib_bihash) * h, BVT (clib_bihash_kv) * key_result)
{
u64 hash;
u32 bucket_index;
BVT (clib_bihash_value) * v;
- clib_bihash_bucket_t *b;
+ BVT (clib_bihash_bucket) * b;
+ BVT (clib_bihash_kv) * kvp;
int i, limit;
- hash = BV (clib_bihash_hash) (kvp);
+ hash = BV (clib_bihash_hash) (key_result);
bucket_index = hash & (h->nbuckets - 1);
b = &h->buckets[bucket_index];
@@ -147,6 +249,22 @@ static inline int BV (clib_bihash_search_inline)
if (b->offset == 0)
return -1;
+ /* Check the cache, if currently enabled */
+ if (PREDICT_TRUE (b->cache_lru & (1 << 15)))
+ {
+ limit = BIHASH_KVP_CACHE_SIZE;
+ kvp = b->cache;
+ for (i = 0; i < limit; i++)
+ {
+ if (BV (clib_bihash_key_compare) (kvp[i].key, key_result->key))
+ {
+ *key_result = kvp[i];
+ h->cache_hits++;
+ return 0;
+ }
+ }
+ }
+
hash >>= h->log2_nbuckets;
v = BV (clib_bihash_get_value) (h, b->offset);
@@ -159,9 +277,22 @@ static inline int BV (clib_bihash_search_inline)
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];
+ u8 cache_slot;
+ *key_result = v->kvp[i];
+
+ /* Shut off the cache */
+ BV (clib_bihash_cache_enable_disable) (b, 0);
+ CLIB_MEMORY_BARRIER ();
+
+ cache_slot = BV (clib_bihash_get_lru) (b);
+ b->cache[cache_slot] = v->kvp[i];
+ BV (clib_bihash_update_lru) (b, cache_slot);
+
+ /* Reenable the cache */
+ BV (clib_bihash_cache_enable_disable) (b, 1);
+ h->cache_misses++;
return 0;
}
}
@@ -169,13 +300,14 @@ static inline int BV (clib_bihash_search_inline)
}
static inline int BV (clib_bihash_search_inline_2)
- (const BVT (clib_bihash) * h,
+ (BVT (clib_bihash) * h,
BVT (clib_bihash_kv) * search_key, BVT (clib_bihash_kv) * valuep)
{
u64 hash;
u32 bucket_index;
BVT (clib_bihash_value) * v;
- clib_bihash_bucket_t *b;
+ BVT (clib_bihash_bucket) * b;
+ BVT (clib_bihash_kv) * kvp;
int i, limit;
ASSERT (valuep);
@@ -188,6 +320,22 @@ static inline int BV (clib_bihash_search_inline_2)
if (b->offset == 0)
return -1;
+ /* Check the cache, if currently enabled */
+ if (PREDICT_TRUE (b->cache_lru & (1 << 15)))
+ {
+ limit = BIHASH_KVP_CACHE_SIZE;
+ kvp = b->cache;
+ for (i = 0; i < limit; i++)
+ {
+ if (BV (clib_bihash_key_compare) (kvp[i].key, search_key->key))
+ {
+ *valuep = kvp[i];
+ h->cache_hits++;
+ return 0;
+ }
+ }
+ }
+
hash >>= h->log2_nbuckets;
v = BV (clib_bihash_get_value) (h, b->offset);
@@ -201,14 +349,26 @@ static inline int BV (clib_bihash_search_inline_2)
{
if (BV (clib_bihash_key_compare) (v->kvp[i].key, search_key->key))
{
+ u8 cache_slot;
*valuep = v->kvp[i];
+
+ /* Shut off the cache */
+ BV (clib_bihash_cache_enable_disable) (b, 0);
+ CLIB_MEMORY_BARRIER ();
+
+ cache_slot = BV (clib_bihash_get_lru) (b);
+ b->cache[cache_slot] = v->kvp[i];
+ BV (clib_bihash_update_lru) (b, cache_slot);
+
+ /* Reenable the cache */
+ BV (clib_bihash_cache_enable_disable) (b, 1);
+ h->cache_misses++;
return 0;
}
}
return -1;
}
-
#endif /* __included_bihash_template_h__ */
/** @endcond */