* A list of rte_kvargs pair of 'key=value'.
* @param key
* The matching key.
-
+ *
* @return
* NULL if no key matches the input,
* a value associated with a matching key otherwise.
* The rte_kvargs structure
* @param key_match
* The key that should match, or NULL to count all associations
-
+ *
* @return
* The number of entries
*/