-Per-port offload configuration is set using ``rte_eth_dev_configure``.
-Per-queue offload configuration is set using ``rte_eth_rx_queue_setup`` and ``rte_eth_tx_queue_setup``.
-To enable per-port offload, the offload should be set on both device configuration and queue setup.
-In case of a mixed configuration the queue setup shall return with an error.
-To enable per-queue offload, the offload can be set only on the queue setup.
-Offloads which are not enabled are disabled by default.
-
-For an application to use the Tx offloads API it should set the ``ETH_TXQ_FLAGS_IGNORE`` flag in the ``txq_flags`` field located in ``rte_eth_txconf`` struct.
-In such cases it is not required to set other flags in ``txq_flags``.
-For an application to use the Rx offloads API it should set the ``ignore_offload_bitfield`` bit in the ``rte_eth_rxmode`` struct.
-In such cases it is not required to set other bitfield offloads in the ``rxmode`` struct.
+Any requested offloading by an application must be within the device capabilities.
+Any offloading is disabled by default if it is not set in the parameter
+``dev_conf->[rt]xmode.offloads`` to ``rte_eth_dev_configure()`` and
+``[rt]x_conf->offloads`` to ``rte_eth_[rt]x_queue_setup()``.
+
+If any offloading is enabled in ``rte_eth_dev_configure()`` by an application,
+it is enabled on all queues no matter whether it is per-queue or
+per-port type and no matter whether it is set or cleared in
+``[rt]x_conf->offloads`` to ``rte_eth_[rt]x_queue_setup()``.
+
+If a per-queue offloading hasn't been enabled in ``rte_eth_dev_configure()``,
+it can be enabled or disabled in ``rte_eth_[rt]x_queue_setup()`` for individual queue.
+A newly added offloads in ``[rt]x_conf->offloads`` to ``rte_eth_[rt]x_queue_setup()`` input by application
+is the one which hasn't been enabled in ``rte_eth_dev_configure()`` and is requested to be enabled
+in ``rte_eth_[rt]x_queue_setup()``. It must be per-queue type, otherwise trigger an error log.