X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=doc%2Fguides%2Fprog_guide%2Fpoll_mode_drv.rst;h=af82352a02aef2b90a549f12b3e536e4408cc8e7;hb=1d339597a17561fb3b285a076100673381bec9a0;hp=e5d01874eb4a85efb9125f329836bf7495c96f50;hpb=5630257fcc30397e7217139ec55da4f301f59fb7;p=dpdk.git diff --git a/doc/guides/prog_guide/poll_mode_drv.rst b/doc/guides/prog_guide/poll_mode_drv.rst index e5d01874eb..af82352a02 100644 --- a/doc/guides/prog_guide/poll_mode_drv.rst +++ b/doc/guides/prog_guide/poll_mode_drv.rst @@ -296,17 +296,37 @@ described in the mbuf API documentation and in the in :ref:`Mbuf Library Per-Port and Per-Queue Offloads ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -In the DPDK offload API, offloads are divided into per-port and per-queue offloads. +In the DPDK offload API, offloads are divided into per-port and per-queue offloads as follows: + +* A per-queue offloading can be enabled on a queue and disabled on another queue at the same time. +* A pure per-port offload is the one supported by device but not per-queue type. +* A pure per-port offloading can't be enabled on a queue and disabled on another queue at the same time. +* A pure per-port offloading must be enabled or disabled on all queues at the same time. +* Any offloading is per-queue or pure per-port type, but can't be both types at same devices. +* Port capabilities = per-queue capabilities + pure per-port capabilities. +* Any supported offloading can be enabled on all queues. + The different offloads capabilities can be queried using ``rte_eth_dev_info_get()``. +The ``dev_info->[rt]x_queue_offload_capa`` returned from ``rte_eth_dev_info_get()`` includes all per-queue offloading capabilities. +The ``dev_info->[rt]x_offload_capa`` returned from ``rte_eth_dev_info_get()`` includes all pure per-port and per-queue offloading capabilities. Supported offloads can be either per-port or per-queue. Offloads are enabled using the existing ``DEV_TX_OFFLOAD_*`` or ``DEV_RX_OFFLOAD_*`` flags. -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. +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. 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``. @@ -345,6 +365,25 @@ Ethernet Device API The Ethernet device API exported by the Ethernet PMDs is described in the *DPDK API Reference*. +Ethernet Device Standard Device Arguments +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Standard Ethernet device arguments allow for a set of commonly used arguments/ +parameters which are applicable to all Ethernet devices to be available to for +specification of specific device and for passing common configuration +parameters to those ports. + +* ``representor`` for a device which supports the creation of representor ports + this argument allows user to specify which switch ports to enable port + representors for.:: + + -w BDBF,representor=0 + -w BDBF,representor=[0,4,6,9] + -w BDBF,representor=[0-31] + +Note: PMDs are not required to support the standard device arguments and users +should consult the relevant PMD documentation to see support devargs. + Extended Statistics API ~~~~~~~~~~~~~~~~~~~~~~~