DPDK hash library offers bulk data lookups with rte_hash_lookup_bulk and rte_hash_lookup_bulk_data. The functions return a bitmask as an argument indicating the hash hits as 1 and miss as 0. I want to know if there are similar keys inside the bulk itself(which needs to be looked up), will they return as hits or misses in the bitmask?
As an example, imagine there are two instances of the same key in the bulk. But that key is not hashed yet. Will both keys will be returned as misses?
In my program, I insert the new key to the hash table when there is a miss(0) in the returned bitmask. But when the bulk has same key more than one time, above logic cannot be used if the lookup returns a miss(0) for each instance of that key in the bulk.