[dpdk-dev] [PATCH v4] hash: added a new API to hash to query key id

[Wang, Yipeng1]

>-----Original Message-----
>From: Amber, Kumar
>Sent: Monday, November 25, 2019 6:39 PM
>To: dev at dpdk.org
>Cc: Wang, Yipeng1 <yipeng1.wang at intel.com>
>Subject: [PATCH v4] hash: added a new API to hash to query key id
>
>Adding new API function to query the maximum key ID
>that could possibly be returned by rte_hash_add_key and
>rte_hash_add_key_with_hash. When RTE_HASH_EXTRA_FLAGS_MULTI_WRITER_ADD
>is set, the maximum key id is larger than the entry count specified
>by the user.
>
>Signed-off-by: Kumar Amber <kumar.amber at intel.com>
>---
> lib/librte_hash/rte_cuckoo_hash.c    | 15 +++++++++++++++
> lib/librte_hash/rte_hash.h           | 25 +++++++++++++++++++++++--
> lib/librte_hash/rte_hash_version.map |  1 +
> 3 files changed, 39 insertions(+), 2 deletions(-)
>
>diff --git a/lib/librte_hash/rte_cuckoo_hash.c b/lib/librte_hash/rte_cuckoo_hash.c
>index 87a4c01f2..41a081f10 100644
>--- a/lib/librte_hash/rte_cuckoo_hash.c
>+++ b/lib/librte_hash/rte_cuckoo_hash.c
>@@ -506,6 +506,21 @@ rte_hash_hash(const struct rte_hash *h, const void *key)
> 	return h->hash_func(key, h->key_len, h->hash_func_init_val);
> }
>
>+int32_t
>+rte_hash_max_key_id(const struct rte_hash *h)
>+{
>+	RETURN_IF_TRUE((h == NULL), -EINVAL);
>+	if (h->use_local_cache)
>+		/*
>+		 * Increase number of slots by total number of indices
>+		 * that can be stored in the lcore caches
>+		 */
>+		return (h->entries + ((RTE_MAX_LCORE - 1) *
>+					(LCORE_CACHE_SIZE - 1)));
>+	else
>+		return h->entries;
>+}
>+
> int32_t
> rte_hash_count(const struct rte_hash *h)
> {
>diff --git a/lib/librte_hash/rte_hash.h b/lib/librte_hash/rte_hash.h
>index 0d73370dc..f93203122 100644
>--- a/lib/librte_hash/rte_hash.h
>+++ b/lib/librte_hash/rte_hash.h
>@@ -164,6 +164,23 @@ rte_hash_reset(struct rte_hash *h);
> int32_t
> rte_hash_count(const struct rte_hash *h);
>
>+/**
>+ * @warning
>+ * @b EXPERIMENTAL: this API may change without prior notice
>+ *
>+ * Return the maximum key value ID that could possibly be returned by
>+ * rte_hash_add_key function.
>+ *
>+ * @param h
>+ *  Hash table to query from
>+ * @return
>+ *   - -EINVAL if parameters are invalid
>+ *   - A value indicating the max key of Id key slots present in the table.
>+ */
[Wang, Yipeng] typo: key of id -> key Id of

Other than this:
Acked-by: Yipeng Wang <yipeng1.wang at intel.com>