MLX5I_MAX_LOG_PKEY_SUP
struct hlist_head buckets[1 << MLX5I_MAX_LOG_PKEY_SUP];
struct hlist_head *h = &buckets[hash_32(qpn, MLX5I_MAX_LOG_PKEY_SUP)];
u8 key = hash_32(qpn, MLX5I_MAX_LOG_PKEY_SUP);