hash: fix total entries count

[ upstream commit 52c7abb ]

In rte_hash, with current implementation, it is possible that keys
are stored at indexes greater than the number of total entries.

Currently, in rte_hash_free_key_with_position(), due to incorrect
computation of total_entries, application cannot free keys with
indexes greater than the number of total entries.

This patch fixes this incorrect computation of total_entries.

Bugzilla ID: 261
Fixes: 9d033da ("hash: support no free on delete")

Reported-by: Linfan <zhongdahulinfan@163.com>
Suggested-by: Linfan <zhongdahulinfan@163.com>
Signed-off-by: Dharmik Thakkar <dharmik.thakkar@arm.com>
Acked-by: Yipeng Wang <yipeng1.wang@intel.com>

lib/librte_hash/rte_cuckoo_hash.c

@@ -1543,7 +1543,9 @@ rte_hash_free_key_with_position(const struct rte_hash *h,
 
 	unsigned int lcore_id, n_slots;
 	struct lcore_cache *cached_free_slots;
-	const uint32_t total_entries = h->num_buckets * RTE_HASH_BUCKET_ENTRIES;
+	const uint32_t total_entries = h->use_local_cache ?
+		h->entries + (RTE_MAX_LCORE - 1) * (LCORE_CACHE_SIZE - 1) + 1
+							: h->entries + 1;
 
 	/* Out of bounds */
 	if (key_idx >= total_entries)