..  SPDX-License-Identifier: BSD-3-Clause
    Copyright(c) 2017 Intel Corporation.

Features Overview
=================

This section explains the supported features that are listed in the
:doc:`overview`.

As a guide to implementers it also shows the structs where the features are
defined and the APIs that can be use to get/set the values.

Following tags used for feature details, these are from driver point of view:

``[uses]``       : Driver uses some kind of input from the application.

``[implements]`` : Driver implements a functionality.

``[provides]``   : Driver provides some kind of data to the application. It is possible
to provide data by implementing some function, but "provides" is used
for cases where provided data can't be represented simply by a function.

``[related]``    : Related API with that feature.


.. _nic_features_speed_capabilities:

Speed capabilities
------------------

Supports getting the speed capabilities that the current device is capable of.

* **[provides] rte_eth_dev_info**: ``speed_capa:RTE_ETH_LINK_SPEED_*``.
* **[related]  API**: ``rte_eth_dev_info_get()``.


.. _nic_features_link_speeds_config:

Link speed configuration
------------------------

Supports configurating fixed speed and link autonegotiation.

* **[uses]     user config**: ``dev_conf.link_speeds:RTE_ETH_LINK_SPEED_*``.
* **[related]  API**: ``rte_eth_dev_configure()``.


.. _nic_features_link_status:

Link status
-----------

Supports getting the link speed, duplex mode and link state (up/down).

* **[implements] eth_dev_ops**: ``link_update``.
* **[implements] rte_eth_dev_data**: ``dev_link``.
* **[related]    API**: ``rte_eth_link_get()``, ``rte_eth_link_get_nowait()``.


.. _nic_features_link_status_event:

Link status event
-----------------

Supports Link Status Change interrupts.

* **[uses]       user config**: ``dev_conf.intr_conf.lsc``.
* **[uses]       rte_eth_dev_data**: ``dev_flags:RTE_ETH_DEV_INTR_LSC``.
* **[uses]       rte_eth_event_type**: ``RTE_ETH_EVENT_INTR_LSC``.
* **[implements] rte_eth_dev_data**: ``dev_link``.
* **[provides]   rte_pci_driver.drv_flags**: ``RTE_PCI_DRV_INTR_LSC``.
* **[related]    API**: ``rte_eth_link_get()``, ``rte_eth_link_get_nowait()``.


.. _nic_features_removal_event:

Removal event
-------------

Supports device removal interrupts.

* **[uses]     user config**: ``dev_conf.intr_conf.rmv``.
* **[uses]     rte_eth_dev_data**: ``dev_flags:RTE_ETH_DEV_INTR_RMV``.
* **[uses]     rte_eth_event_type**: ``RTE_ETH_EVENT_INTR_RMV``.
* **[provides] rte_pci_driver.drv_flags**: ``RTE_PCI_DRV_INTR_RMV``.


.. _nic_features_queue_status_event:

Queue status event
------------------

Supports queue enable/disable events.

* **[uses] rte_eth_event_type**: ``RTE_ETH_EVENT_QUEUE_STATE``.


.. _nic_features_rx_interrupt:

Rx interrupt
------------

Supports Rx interrupts.

* **[uses]       user config**: ``dev_conf.intr_conf.rxq``.
* **[implements] eth_dev_ops**: ``rx_queue_intr_enable``, ``rx_queue_intr_disable``.
* **[related]    API**: ``rte_eth_dev_rx_intr_enable()``, ``rte_eth_dev_rx_intr_disable()``.


.. _nic_features_lock-free_tx_queue:

Lock-free Tx queue
------------------

If a PMD advertises RTE_ETH_TX_OFFLOAD_MT_LOCKFREE capable, multiple threads can
invoke rte_eth_tx_burst() concurrently on the same Tx queue without SW lock.

* **[uses]    rte_eth_txconf,rte_eth_txmode**: ``offloads:RTE_ETH_TX_OFFLOAD_MT_LOCKFREE``.
* **[provides] rte_eth_dev_info**: ``tx_offload_capa,tx_queue_offload_capa:RTE_ETH_TX_OFFLOAD_MT_LOCKFREE``.
* **[related]  API**: ``rte_eth_tx_burst()``.


.. _nic_features_fast_mbuf_free:

Fast mbuf free
--------------

Supports optimization for fast release of mbufs following successful Tx.
Requires that per queue, all mbufs come from the same mempool and has refcnt = 1.

* **[uses]       rte_eth_txconf,rte_eth_txmode**: ``offloads:RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE``.
* **[provides]   rte_eth_dev_info**: ``tx_offload_capa,tx_queue_offload_capa:RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE``.


.. _nic_features_free_tx_mbuf_on_demand:

Free Tx mbuf on demand
----------------------

Supports freeing consumed buffers on a Tx ring.

* **[implements] eth_dev_ops**: ``tx_done_cleanup``.
* **[related]    API**: ``rte_eth_tx_done_cleanup()``.


.. _nic_features_queue_start_stop:

Queue start/stop
----------------

Supports starting/stopping a specific Rx/Tx queue of a port.
This is required for use deferred start configuration option.

* **[implements] eth_dev_ops**: ``rx_queue_start``, ``rx_queue_stop``, ``tx_queue_start``,
  ``tx_queue_stop``.
* **[related]    API**: ``rte_eth_dev_rx_queue_start()``, ``rte_eth_dev_rx_queue_stop()``,
  ``rte_eth_dev_tx_queue_start()``, ``rte_eth_dev_tx_queue_stop()``.


.. _nic_features_mtu_update:

MTU update
----------

Supports updating port MTU.

* **[implements] eth_dev_ops**: ``mtu_set``.
* **[implements] rte_eth_dev_data**: ``mtu``.
* **[provides]   rte_eth_dev_info**: ``max_rx_pktlen``.
* **[related]    API**: ``rte_eth_dev_set_mtu()``, ``rte_eth_dev_get_mtu()``.


.. _nic_features_scattered_rx:

Scattered Rx
------------

Supports receiving segmented mbufs.

* **[uses]       rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_SCATTER``.
* **[implements] datapath**: ``Scattered Rx function``.
* **[implements] rte_eth_dev_data**: ``scattered_rx``.
* **[provides]   eth_dev_ops**: ``rxq_info_get:scattered_rx``.
* **[related]    eth_dev_ops**: ``rx_pkt_burst``.


.. _nic_features_buffer_split:

Buffer split on Rx
------------------

Scatters the packets being received on specified boundaries to segmented mbufs.

* **[uses]       rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT``.
* **[uses]       rte_eth_rxconf**: ``rx_conf.rx_seg, rx_conf.rx_nseg``.
* **[implements] eth_dev_ops**: ``buffer_split_supported_hdr_ptypes_get``,
* **[implements] datapath**: ``Buffer Split functionality``.
* **[provides]   rte_eth_dev_info**: ``rx_offload_capa:RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT``.
* **[related] API**: ``rte_eth_rx_queue_setup()``, ``rte_eth_buffer_split_get_supported_hdr_ptypes()``.


.. _nic_features_lro:

LRO
---

Supports Large Receive Offload.

* **[uses]       rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_TCP_LRO``.
  ``dev_conf.rxmode.max_lro_pkt_size``.
* **[implements] datapath**: ``LRO functionality``.
* **[implements] rte_eth_dev_data**: ``lro``.
* **[provides]   mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_RX_LRO``, ``mbuf.tso_segsz``.
* **[provides]   rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa:RTE_ETH_RX_OFFLOAD_TCP_LRO``.
* **[provides]   rte_eth_dev_info**: ``max_lro_pkt_size``.


.. _nic_features_tso:

TSO
---

Supports TCP Segmentation Offloading.

* **[uses]       rte_eth_txconf,rte_eth_txmode**: ``offloads:RTE_ETH_TX_OFFLOAD_TCP_TSO``.
* **[uses]       rte_eth_desc_lim**: ``nb_seg_max``, ``nb_mtu_seg_max``.
* **[uses]       mbuf**: ``mbuf.ol_flags:`` ``RTE_MBUF_F_TX_TCP_SEG``, ``RTE_MBUF_F_TX_IPV4``, ``RTE_MBUF_F_TX_IPV6``, ``RTE_MBUF_F_TX_IP_CKSUM``.
* **[uses]       mbuf**: ``mbuf.tso_segsz``, ``mbuf.l2_len``, ``mbuf.l3_len``, ``mbuf.l4_len``.
* **[implements] datapath**: ``TSO functionality``.
* **[provides]   rte_eth_dev_info**: ``tx_offload_capa,tx_queue_offload_capa:RTE_ETH_TX_OFFLOAD_TCP_TSO,RTE_ETH_TX_OFFLOAD_UDP_TSO``.


.. _nic_features_promiscuous_mode:

Promiscuous mode
----------------

Supports enabling/disabling promiscuous mode for a port.

* **[implements] eth_dev_ops**: ``promiscuous_enable``, ``promiscuous_disable``.
* **[implements] rte_eth_dev_data**: ``promiscuous``.
* **[related]    API**: ``rte_eth_promiscuous_enable()``, ``rte_eth_promiscuous_disable()``,
  ``rte_eth_promiscuous_get()``.


.. _nic_features_allmulticast_mode:

Allmulticast mode
-----------------

Supports enabling/disabling receiving multicast frames.

* **[implements] eth_dev_ops**: ``allmulticast_enable``, ``allmulticast_disable``.
* **[implements] rte_eth_dev_data**: ``all_multicast``.
* **[related]    API**: ``rte_eth_allmulticast_enable()``,
  ``rte_eth_allmulticast_disable()``, ``rte_eth_allmulticast_get()``.


.. _nic_features_unicast_mac_filter:

Unicast MAC filter
------------------

Supports adding MAC addresses to enable incoming filtering of packets.

* **[implements] eth_dev_ops**: ``mac_addr_set``, ``mac_addr_add``, ``mac_addr_remove``.
* **[implements] rte_eth_dev_data**: ``mac_addrs``.
* **[related]    API**: ``rte_eth_dev_default_mac_addr_set()``,
  ``rte_eth_dev_mac_addr_add()``, ``rte_eth_dev_mac_addr_remove()``,
  ``rte_eth_macaddr_get()``.


.. _nic_features_multicast_mac_filter:

Multicast MAC filter
--------------------

Supports setting multicast addresses to filter.

* **[implements] eth_dev_ops**: ``set_mc_addr_list``.
* **[related]    API**: ``rte_eth_dev_set_mc_addr_list()``.


.. _nic_features_rss_hash:

RSS hash
--------

Supports RSS hashing on RX.

* **[uses]     user config**: ``dev_conf.rxmode.mq_mode`` = ``RTE_ETH_MQ_RX_RSS_FLAG``.
* **[uses]     user config**: ``rss_conf.rss_hf``.
* **[uses]     rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_RSS_HASH``.
* **[provides] rte_eth_dev_info**: ``flow_type_rss_offloads``.
* **[provides] mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_RX_RSS_HASH``, ``mbuf.rss``.
* **[related]  API**: ``rte_eth_dev_configure()``, ``rte_eth_dev_rss_hash_update``
  ``rte_eth_dev_rss_hash_conf_get()``.

Supports RSS hash algorithm on Rx.

* **[implements] eth_dev_ops**: ``dev_configure``, ``rss_hash_update``, ``rss_hash_conf_get``.
* **[uses]       user config**: ``rss_conf.algorithm``
* **[provides]   rte_eth_dev_info**: ``rss_algo_capa``.
* **[related]    API**: ``rte_eth_dev_configure()``, ``rte_eth_dev_rss_hash_update()``,
  ``rte_eth_dev_rss_hash_conf_get()``.


.. _nic_features_inner_rss:

Inner RSS
---------

Supports RSS hashing on inner headers with flow API.

* **[uses]    rte_flow_action_rss**: ``level``.
* **[uses]    rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_RSS_HASH``.
* **[provides] mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_RX_RSS_HASH``, ``mbuf.rss``.


.. _nic_features_rss_key_update:

RSS key update
--------------

Supports configuration of Receive Side Scaling (RSS) hash computation. Updating
Receive Side Scaling (RSS) hash key.

* **[implements] eth_dev_ops**: ``dev_configure``, ``rss_hash_update``, ``rss_hash_conf_get``.
* **[uses]       user config**: ``rss_conf.rss_key``, ``rss_conf.rss_key_len``.
* **[provides]   rte_eth_dev_info**: ``hash_key_size``.
* **[related]    API**: ``rte_eth_dev_configure()``, ``rte_eth_dev_rss_hash_update()``,
  ``rte_eth_dev_rss_hash_conf_get()``.


.. _nic_features_rss_reta_update:

RSS reta update
---------------

Supports updating Redirection Table of the Receive Side Scaling (RSS).

* **[implements] eth_dev_ops**: ``reta_update``, ``reta_query``.
* **[provides]   rte_eth_dev_info**: ``reta_size``.
* **[related]    API**: ``rte_eth_dev_rss_reta_update()``, ``rte_eth_dev_rss_reta_query()``.


.. _nic_features_vmdq:

VMDq
----

Supports Virtual Machine Device Queues (VMDq).

* **[uses] user config**: ``dev_conf.rxmode.mq_mode`` = ``RTE_ETH_MQ_RX_VMDQ_FLAG``.
* **[uses] user config**: ``dev_conf.rx_adv_conf.vmdq_dcb_conf``.
* **[uses] user config**: ``dev_conf.rx_adv_conf.vmdq_rx_conf``.
* **[uses] user config**: ``dev_conf.tx_adv_conf.vmdq_dcb_tx_conf``.
* **[uses] user config**: ``dev_conf.tx_adv_conf.vmdq_tx_conf``.


.. _nic_features_sriov:

SR-IOV
------

Driver supports creating Virtual Functions.

* **[implements] rte_eth_dev_data**: ``sriov``.

.. _nic_features_dcb:

DCB
---

Supports Data Center Bridging (DCB).

* **[uses]       user config**: ``dev_conf.rxmode.mq_mode`` = ``RTE_ETH_MQ_RX_DCB_FLAG``.
* **[uses]       user config**: ``dev_conf.rx_adv_conf.vmdq_dcb_conf``.
* **[uses]       user config**: ``dev_conf.rx_adv_conf.dcb_rx_conf``.
* **[uses]       user config**: ``dev_conf.tx_adv_conf.vmdq_dcb_tx_conf``.
* **[uses]       user config**: ``dev_conf.tx_adv_conf.vmdq_tx_conf``.
* **[implements] eth_dev_ops**: ``get_dcb_info``.
* **[related]    API**: ``rte_eth_dev_get_dcb_info()``.


.. _nic_features_vlan_filter:

VLAN filter
-----------

Supports filtering of a VLAN Tag identifier.

* **[uses]       rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_VLAN_FILTER``.
* **[implements] eth_dev_ops**: ``vlan_filter_set``.
* **[related]    API**: ``rte_eth_dev_vlan_filter()``.


.. _nic_features_flow_control:

Flow control
------------

Supports configuring link flow control.

* **[implements] eth_dev_ops**: ``flow_ctrl_get``, ``flow_ctrl_set``,
  ``priority_flow_ctrl_set``, ``priority_flow_ctrl_queue_info_get``,
  ``priority_flow_ctrl_queue_configure``
* **[related]    API**: ``rte_eth_dev_flow_ctrl_get()``, ``rte_eth_dev_flow_ctrl_set()``,
  ``rte_eth_dev_priority_flow_ctrl_set()``,
  ``rte_eth_dev_priority_flow_ctrl_queue_info_get()``,
  ``rte_eth_dev_priority_flow_ctrl_queue_configure()``.


.. _nic_features_rate_limitation:

Rate limitation
---------------

Supports Tx rate limitation for a queue.

* **[implements] eth_dev_ops**: ``set_queue_rate_limit``.
* **[related]    API**: ``rte_eth_set_queue_rate_limit()``.


.. _nic_features_inline_crypto_doc:

Inline crypto
-------------

Supports inline crypto processing defined by rte_security library to perform crypto
operations of security protocol while packet is received in NIC. NIC is not aware
of protocol operations. See Security library and PMD documentation for more details.

* **[uses]       rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_SECURITY``,
* **[uses]       rte_eth_txconf,rte_eth_txmode**: ``offloads:RTE_ETH_TX_OFFLOAD_SECURITY``.
* **[uses]       mbuf**: ``mbuf.l2_len``.
* **[implements] rte_security_ops**: ``session_create``, ``session_update``,
  ``session_stats_get``, ``session_destroy``, ``set_pkt_metadata``, ``capabilities_get``.
* **[provides] rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa:RTE_ETH_RX_OFFLOAD_SECURITY``,
  ``tx_offload_capa,tx_queue_offload_capa:RTE_ETH_TX_OFFLOAD_SECURITY``.
* **[provides]   mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_RX_SEC_OFFLOAD``,
  ``mbuf.ol_flags:RTE_MBUF_F_TX_SEC_OFFLOAD``, ``mbuf.ol_flags:RTE_MBUF_F_RX_SEC_OFFLOAD_FAILED``.
* **[provides]   rte_security_ops, capabilities_get**:  ``action: RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO``


.. _nic_features_inline_protocol_doc:

Inline protocol
---------------

Supports inline protocol processing defined by rte_security library to perform
protocol processing for the security protocol (e.g. IPsec, MACSEC) while the
packet is received at NIC. The NIC is capable of understanding the security
protocol operations. See security library and PMD documentation for more details.

* **[uses]       rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_SECURITY``,
* **[uses]       rte_eth_txconf,rte_eth_txmode**: ``offloads:RTE_ETH_TX_OFFLOAD_SECURITY``.
* **[uses]       mbuf**: ``mbuf.l2_len``, ``mbuf.l3_len``, ``mbuf.ol_flags``.
* **[implements] rte_security_ops**: ``session_create``, ``session_update``,
  ``session_stats_get``, ``session_destroy``, ``set_pkt_metadata``,
  ``capabilities_get``.
* **[provides] rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa:RTE_ETH_RX_OFFLOAD_SECURITY``,
  ``tx_offload_capa,tx_queue_offload_capa:RTE_ETH_TX_OFFLOAD_SECURITY``.
* **[provides]   mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_RX_SEC_OFFLOAD``,
  ``mbuf.ol_flags:RTE_MBUF_F_TX_SEC_OFFLOAD``, ``mbuf.ol_flags:RTE_MBUF_F_RX_SEC_OFFLOAD_FAILED``.
* **[provides]   rte_security_ops, capabilities_get**:  ``action: RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL``


.. _nic_features_crc_offload:

CRC offload
-----------

Supports CRC stripping by hardware.
A PMD assumed to support CRC stripping by default. PMD should advertise if it supports keeping CRC.

* **[uses] rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_KEEP_CRC``.


.. _nic_features_vlan_offload:

VLAN offload
------------

Supports VLAN offload to hardware.

* **[uses]       rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_VLAN_STRIP,RTE_ETH_RX_OFFLOAD_VLAN_FILTER,RTE_ETH_RX_OFFLOAD_VLAN_EXTEND``.
* **[uses]       rte_eth_txconf,rte_eth_txmode**: ``offloads:RTE_ETH_TX_OFFLOAD_VLAN_INSERT``.
* **[uses]       mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_TX_VLAN``, ``mbuf.vlan_tci``.
* **[implements] eth_dev_ops**: ``vlan_offload_set``.
* **[provides]   mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_RX_VLAN_STRIPPED``, ``mbuf.ol_flags:RTE_MBUF_F_RX_VLAN`` ``mbuf.vlan_tci``.
* **[provides]   rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa:RTE_ETH_RX_OFFLOAD_VLAN_STRIP``,
  ``tx_offload_capa,tx_queue_offload_capa:RTE_ETH_TX_OFFLOAD_VLAN_INSERT``.
* **[related]    API**: ``rte_eth_dev_set_vlan_offload()``,
  ``rte_eth_dev_get_vlan_offload()``.


.. _nic_features_qinq_offload:

QinQ offload
------------

Supports QinQ (queue in queue) offload.

* **[uses]     rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_QINQ_STRIP``.
* **[uses]     rte_eth_txconf,rte_eth_txmode**: ``offloads:RTE_ETH_TX_OFFLOAD_QINQ_INSERT``.
* **[uses]     mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_TX_QINQ``, ``mbuf.vlan_tci_outer``.
* **[provides] mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_RX_QINQ_STRIPPED``, ``mbuf.ol_flags:RTE_MBUF_F_RX_QINQ``,
  ``mbuf.ol_flags:RTE_MBUF_F_RX_VLAN_STRIPPED``, ``mbuf.ol_flags:RTE_MBUF_F_RX_VLAN``
  ``mbuf.vlan_tci``, ``mbuf.vlan_tci_outer``.
* **[provides] rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa:RTE_ETH_RX_OFFLOAD_QINQ_STRIP``,
  ``tx_offload_capa,tx_queue_offload_capa:RTE_ETH_TX_OFFLOAD_QINQ_INSERT``.


.. _nic_features_fec:

FEC
---

Supports Forward error correction. Forward error correction (FEC) is a bit error correction mode.
It adds error correction information to data packets at the transmit end, and uses the error correction
information to correct the bit errors generated during data packet transmission at the receive end. This
improves signal quality but also brings a delay to signals. This function can be enabled or disabled as required.

* **[implements] eth_dev_ops**: ``fec_get_capability``, ``fec_get``, ``fec_set``.
* **[provides]   rte_eth_fec_capa**: ``speed:RTE_ETH_SPEED_NUM_*``, ``capa:RTE_ETH_FEC_MODE_TO_CAPA()``.
* **[related]    API**: ``rte_eth_fec_get_capability()``, ``rte_eth_fec_get()``, ``rte_eth_fec_set()``.


.. _nic_features_ip_reassembly:

IP reassembly
-------------

Supports IP reassembly in hardware.

* **[provides] eth_dev_ops**: ``ip_reassembly_capability_get``,
  ``ip_reassembly_conf_get``, ``ip_reassembly_conf_set``.
* **[related]    API**: ``rte_eth_ip_reassembly_capability_get()``,
  ``rte_eth_ip_reassembly_conf_get()``, ``rte_eth_ip_reassembly_conf_set()``.


.. _nic_features_l3_checksum_offload:

L3 checksum offload
-------------------

Supports L3 checksum offload.

* **[uses]     rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_IPV4_CKSUM``.
* **[uses]     rte_eth_txconf,rte_eth_txmode**: ``offloads:RTE_ETH_TX_OFFLOAD_IPV4_CKSUM``.
* **[uses]     mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_TX_IP_CKSUM``,
  ``mbuf.ol_flags:RTE_MBUF_F_TX_IPV4`` | ``RTE_MBUF_F_TX_IPV6``.
* **[uses]     mbuf**: ``mbuf.l2_len``, ``mbuf.l3_len``.
* **[provides] mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_RX_IP_CKSUM_UNKNOWN`` |
  ``RTE_MBUF_F_RX_IP_CKSUM_BAD`` | ``RTE_MBUF_F_RX_IP_CKSUM_GOOD`` |
  ``RTE_MBUF_F_RX_IP_CKSUM_NONE``.
* **[provides] rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa:RTE_ETH_RX_OFFLOAD_IPV4_CKSUM``,
  ``tx_offload_capa,tx_queue_offload_capa:RTE_ETH_TX_OFFLOAD_IPV4_CKSUM``.


.. _nic_features_l4_checksum_offload:

L4 checksum offload
-------------------

Supports L4 checksum offload.

* **[uses]     rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_UDP_CKSUM,RTE_ETH_RX_OFFLOAD_TCP_CKSUM,RTE_ETH_RX_OFFLOAD_SCTP_CKSUM``.
* **[uses]     rte_eth_txconf,rte_eth_txmode**: ``offloads:RTE_ETH_TX_OFFLOAD_UDP_CKSUM,RTE_ETH_TX_OFFLOAD_TCP_CKSUM,RTE_ETH_TX_OFFLOAD_SCTP_CKSUM``.
* **[uses]     mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_TX_IPV4`` | ``RTE_MBUF_F_TX_IPV6``,
  ``mbuf.ol_flags:RTE_MBUF_F_TX_L4_NO_CKSUM`` | ``RTE_MBUF_F_TX_TCP_CKSUM`` |
  ``RTE_MBUF_F_TX_SCTP_CKSUM`` | ``RTE_MBUF_F_TX_UDP_CKSUM``.
* **[uses]     mbuf**: ``mbuf.l2_len``, ``mbuf.l3_len``.
* **[provides] mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_RX_L4_CKSUM_UNKNOWN`` |
  ``RTE_MBUF_F_RX_L4_CKSUM_BAD`` | ``RTE_MBUF_F_RX_L4_CKSUM_GOOD`` |
  ``RTE_MBUF_F_RX_L4_CKSUM_NONE``.
* **[provides] rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa:RTE_ETH_RX_OFFLOAD_UDP_CKSUM,RTE_ETH_RX_OFFLOAD_TCP_CKSUM,RTE_ETH_RX_OFFLOAD_SCTP_CKSUM``,
  ``tx_offload_capa,tx_queue_offload_capa:RTE_ETH_TX_OFFLOAD_UDP_CKSUM,RTE_ETH_TX_OFFLOAD_TCP_CKSUM,RTE_ETH_TX_OFFLOAD_SCTP_CKSUM``.

.. _nic_features_hw_timestamp:

Timestamp offload
-----------------

Supports Timestamp.

* **[uses]     rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_TIMESTAMP``.
* **[provides] mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_RX_TIMESTAMP``.
* **[provides] mbuf**: ``mbuf.timestamp``.
* **[provides] rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa: RTE_ETH_RX_OFFLOAD_TIMESTAMP``.
* **[related] eth_dev_ops**: ``read_clock``.

.. _nic_features_macsec_offload:

MACsec offload
--------------

Supports MACsec.

* **[uses]     rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_MACSEC_STRIP``.
* **[uses]     rte_eth_txconf,rte_eth_txmode**: ``offloads:RTE_ETH_TX_OFFLOAD_MACSEC_INSERT``.
* **[uses]     mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_TX_MACSEC``.
* **[provides] rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa:RTE_ETH_RX_OFFLOAD_MACSEC_STRIP``,
  ``tx_offload_capa,tx_queue_offload_capa:RTE_ETH_TX_OFFLOAD_MACSEC_INSERT``.


.. _nic_features_inner_l3_checksum:

Inner L3 checksum
-----------------

Supports inner packet L3 checksum.

* **[uses]     rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_OUTER_IPV4_CKSUM``.
* **[uses]     rte_eth_txconf,rte_eth_txmode**: ``offloads:RTE_ETH_TX_OFFLOAD_OUTER_IPV4_CKSUM``.
* **[uses]     mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_TX_IP_CKSUM``,
  ``mbuf.ol_flags:RTE_MBUF_F_TX_IPV4`` | ``RTE_MBUF_F_TX_IPV6``,
  ``mbuf.ol_flags:RTE_MBUF_F_TX_OUTER_IP_CKSUM``,
  ``mbuf.ol_flags:RTE_MBUF_F_TX_OUTER_IPV4`` | ``RTE_MBUF_F_TX_OUTER_IPV6``.
* **[uses]     mbuf**: ``mbuf.outer_l2_len``, ``mbuf.outer_l3_len``.
* **[provides] mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_RX_OUTER_IP_CKSUM_BAD``.
* **[provides] rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa:RTE_ETH_RX_OFFLOAD_OUTER_IPV4_CKSUM``,
  ``tx_offload_capa,tx_queue_offload_capa:RTE_ETH_TX_OFFLOAD_OUTER_IPV4_CKSUM``.


.. _nic_features_inner_l4_checksum:

Inner L4 checksum
-----------------

Supports inner packet L4 checksum.

* **[uses]     rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_OUTER_UDP_CKSUM``.
* **[provides] mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_RX_OUTER_L4_CKSUM_UNKNOWN`` |
  ``RTE_MBUF_F_RX_OUTER_L4_CKSUM_BAD`` | ``RTE_MBUF_F_RX_OUTER_L4_CKSUM_GOOD`` | ``RTE_MBUF_F_RX_OUTER_L4_CKSUM_INVALID``.
* **[uses]     rte_eth_txconf,rte_eth_txmode**: ``offloads:RTE_ETH_TX_OFFLOAD_OUTER_UDP_CKSUM``.
* **[uses]     mbuf**: ``mbuf.ol_flags:RTE_MBUF_F_TX_OUTER_IPV4`` | ``RTE_MBUF_F_TX_OUTER_IPV6``.
  ``mbuf.ol_flags:RTE_MBUF_F_TX_OUTER_UDP_CKSUM``.
* **[uses]     mbuf**: ``mbuf.outer_l2_len``, ``mbuf.outer_l3_len``.
* **[provides] rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa:RTE_ETH_RX_OFFLOAD_OUTER_UDP_CKSUM``,
  ``tx_offload_capa,tx_queue_offload_capa:RTE_ETH_TX_OFFLOAD_OUTER_UDP_CKSUM``.


.. _nic_features_shared_rx_queue:

Shared Rx queue
---------------

Supports shared Rx queue for ports in same Rx domain of a switch domain.

* **[uses]     rte_eth_dev_info**: ``dev_capa:RTE_ETH_DEV_CAPA_RXQ_SHARE``.
* **[uses]     rte_eth_dev_info，rte_eth_switch_info**: ``rx_domain``, ``domain_id``.
* **[uses]     rte_eth_rxconf**: ``share_group``, ``share_qid``.
* **[provides] mbuf**: ``mbuf.port``.


.. _nic_features_packet_type_parsing:

Packet type parsing
-------------------

Supports packet type parsing and returns a list of supported types.
Allows application to set ptypes it is interested in.

* **[implements] eth_dev_ops**: ``dev_supported_ptypes_get``,
* **[related]    API**: ``rte_eth_dev_get_supported_ptypes()``,
  ``rte_eth_dev_set_ptypes()``, ``dev_ptypes_set``.
* **[provides]   mbuf**: ``mbuf.packet_type``.


.. _nic_features_timesync:

Timesync
--------

Supports IEEE1588/802.1AS timestamping.

* **[implements] eth_dev_ops**: ``timesync_enable``, ``timesync_disable``
  ``timesync_read_rx_timestamp``, ``timesync_read_tx_timestamp``,
  ``timesync_adjust_time``, ``timesync_adjust_freq``,
  ``timesync_read_time``, ``timesync_write_time``.
* **[related]    API**: ``rte_eth_timesync_enable()``, ``rte_eth_timesync_disable()``,
  ``rte_eth_timesync_read_rx_timestamp()``,
  ``rte_eth_timesync_read_tx_timestamp``, ``rte_eth_timesync_adjust_time()``,
  ``rte_eth_timesync_adjust_freq()``,
  ``rte_eth_timesync_read_time()``, ``rte_eth_timesync_write_time()``.


.. _nic_features_rx_descriptor_status:

Rx descriptor status
--------------------

Supports check the status of a Rx descriptor. When ``rx_descriptor_status`` is
used, status can be "Available", "Done" or "Unavailable".

* **[implements] rte_eth_dev**: ``rx_descriptor_status``.
* **[related]    API**: ``rte_eth_rx_descriptor_status()``.


.. _nic_features_tx_descriptor_status:

Tx descriptor status
--------------------

Supports checking the status of a Tx descriptor. Status can be "Full", "Done"
or "Unavailable."

* **[implements] rte_eth_dev**: ``tx_descriptor_status``.
* **[related]    API**: ``rte_eth_tx_descriptor_status()``.


.. _nic_features_tx_queue_count:

Tx queue count
--------------

Supports getting the number of used descriptors of a Tx queue.

* **[implements] eth_dev_ops**: ``tx_queue_count``.
* **[related] API**: ``rte_eth_tx_queue_count()``.


.. _nic_features_basic_stats:

Basic stats
-----------

Support basic statistics such as: ipackets, opackets, ibytes, obytes,
imissed, ierrors, oerrors, rx_nombuf.

These apply to all drivers.

* **[implements] eth_dev_ops**: ``stats_get``, ``stats_reset``.
* **[related]    API**: ``rte_eth_stats_get``, ``rte_eth_stats_reset()``.


.. _nic_features_stats_per_queue:

Stats per queue
---------------

Supports per queue stats: q_ipackets, q_opackets, q_ibytes, q_obytes, q_errors.
Statistics only supplied for first ``RTE_ETHDEV_QUEUE_STAT_CNTRS`` (16) queues.
If driver does not support this feature the per queue stats will be zero.

* **[implements] eth_dev_ops**: ``stats_get``, ``stats_reset``.
* **[related]    API**: ``rte_eth_stats_get``, ``rte_eth_stats_reset()``.

May also support configuring per-queue stat counter mapping.
Used by some drivers to workaround HW limitations.

* **[implements] eth_dev_ops**: ``queue_stats_mapping_set``.
* **[related]    API**: ``rte_eth_dev_set_rx_queue_stats_mapping()``,
  ``rte_eth_dev_set_tx_queue_stats_mapping()``.


.. _nic_features_extended_stats:

Extended stats
--------------

Supports Extended Statistics, changes from driver to driver.

* **[implements] eth_dev_ops**: ``xstats_get``, ``xstats_reset``, ``xstats_get_names``.
* **[implements] eth_dev_ops**: ``xstats_get_by_id``, ``xstats_get_names_by_id``.
* **[related]    API**: ``rte_eth_xstats_get()``, ``rte_eth_xstats_reset()``,
  ``rte_eth_xstats_get_names``, ``rte_eth_xstats_get_by_id()``,
  ``rte_eth_xstats_get_names_by_id()``, ``rte_eth_xstats_get_id_by_name()``.


.. _nic_features_congestion_management:

Congestion management
---------------------

Supports congestion management.

* **[implements] eth_dev_ops**: ``cman_info_get``, ``cman_config_set``, ``cman_config_get``.
* **[related]    API**: ``rte_eth_cman_info_get()``, ``rte_eth_cman_config_init()``,
  ``rte_eth_cman_config_set()``, ``rte_eth_cman_config_get()``.


.. _nic_features_traffic_manager:

Traffic manager
---------------

Supports Traffic manager.

* **[implements] rte_tm_ops**: ``capabilities_get``, ``shaper_profile_add``,
  ``hierarchy_commit`` and so on.
* **[related]    API**: ``rte_tm_capabilities_get()``, ``rte_tm_shaper_profile_add()``,
  ``rte_tm_hierarchy_commit()`` and so on.


.. _nic_features_fw_version:

FW version
----------

Supports getting device hardware firmware information.

* **[implements] eth_dev_ops**: ``fw_version_get``.
* **[related]    API**: ``rte_eth_dev_fw_version_get()``.


.. _nic_features_eeprom_dump:

EEPROM dump
-----------

Supports getting/setting device eeprom data.

* **[implements] eth_dev_ops**: ``get_eeprom_length``, ``get_eeprom``, ``set_eeprom``.
* **[related]    API**: ``rte_eth_dev_get_eeprom_length()``, ``rte_eth_dev_get_eeprom()``,
  ``rte_eth_dev_set_eeprom()``.


.. _nic_features_module_eeprom_dump:

Module EEPROM dump
------------------

Supports getting information and data of plugin module eeprom.

* **[implements] eth_dev_ops**: ``get_module_info``, ``get_module_eeprom``.
* **[related]    API**: ``rte_eth_dev_get_module_info()``, ``rte_eth_dev_get_module_eeprom()``.


.. _nic_features_register_dump:

Registers dump
--------------

Supports retrieving device registers and registering attributes (number of
registers and register size).

* **[implements] eth_dev_ops**: ``get_reg``.
* **[related]    API**: ``rte_eth_dev_get_reg_info()``.


.. _nic_features_led:

LED
---

Supports turning on/off a software controllable LED on a device.

* **[implements] eth_dev_ops**: ``dev_led_on``, ``dev_led_off``.
* **[related]    API**: ``rte_eth_led_on()``, ``rte_eth_led_off()``.


.. _nic_features_multiprocess_aware:

Multiprocess aware
------------------

Driver can be used for primary-secondary process model.


.. _nic_features_freebsd:

FreeBSD
-------

Supports running on FreeBSD.


.. _nic_features_linux:

Linux
-----

Supports running on Linux.


.. _nic_features_windows:

Windows
-------

Supports running on Windows.


.. _nic_features_armv7:

ARMv7
-----

Support armv7 architecture.


.. _nic_features_armv8:

ARMv8
-----

Support armv8a (64bit) architecture.


.. _nic_features_loongarch64:

LoongArch64
-----------

Support 64-bit LoongArch architecture.


.. _nic_features_power8:

Power8
------

Support PowerPC architecture.


.. _nic_features_x86-32:

rv64
----

Support 64-bit RISC-V architecture.


x86-32
------

Support 32bits x86 architecture.


.. _nic_features_x86-64:

x86-64
------

Support 64bits x86 architecture.

.. _nic_features_usage_doc:

Usage doc
---------

Documentation describes usage.

See ``doc/guides/nics/*.rst``


.. _nic_features_design_doc:

Design doc
----------

Documentation describes design.

See ``doc/guides/nics/*.rst``.


.. _nic_features_perf_doc:

Perf doc
--------

Documentation describes performance values.

See ``dpdk.org/doc/perf/*``.

.. _nic_features_runtime_rx_queue_setup:

Runtime Rx queue setup
----------------------

Supports Rx queue setup after device started.

* **[provides] rte_eth_dev_info**: ``dev_capa:RTE_ETH_DEV_CAPA_RUNTIME_RX_QUEUE_SETUP``.
* **[related]  API**: ``rte_eth_dev_info_get()``.

.. _nic_features_runtime_tx_queue_setup:

Runtime Tx queue setup
----------------------

Supports Tx queue setup after device started.

* **[provides] rte_eth_dev_info**: ``dev_capa:RTE_ETH_DEV_CAPA_RUNTIME_TX_QUEUE_SETUP``.
* **[related]  API**: ``rte_eth_dev_info_get()``.

.. _nic_features_burst_mode_info:

Burst mode info
---------------

Supports to get Rx/Tx packet burst mode information.

* **[implements] eth_dev_ops**: ``rx_burst_mode_get``, ``tx_burst_mode_get``.
* **[related] API**: ``rte_eth_rx_burst_mode_get()``, ``rte_eth_tx_burst_mode_get()``.

.. _nic_features_get_monitor_addr:

PMD power management using monitor addresses
--------------------------------------------

Supports getting a monitoring condition to use together with Ethernet PMD power
management (see :doc:`../prog_guide/power_man` for more details).

* **[implements] eth_dev_ops**: ``get_monitor_addr``

.. _nic_features_other:

Other dev ops not represented by a Feature
------------------------------------------

* ``rxq_info_get``
* ``txq_info_get``
* ``vlan_tpid_set``
* ``vlan_strip_queue_set``
* ``vlan_pvid_set``
* ``rx_queue_count``
* ``uc_hash_table_set``
* ``uc_all_hash_table_set``
* ``udp_tunnel_port_add``
* ``udp_tunnel_port_del``
* ``tx_pkt_prepare``
