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-:lastproofread: 2026-02-23
-
-.. _vpp_config_dataplane_interface:
-
-.. include:: /_include/need_improvement.txt
-
-######################################
-VPP Dataplane Interfaces Configuration
-######################################
-
-Only Ethernet interfaces (physical or virtual) can be connected to the
-VPP dataplane. Interfaces configured here act as a bridge between VPP
-and the outside world, allowing VPP to send and receive network
-packets.
-
-
-Interface Configuration Parameters
-==================================
-
-Interfaces connected to the VPP dataplane use the DPDK driver by default,
-providing high performance and low latency.
-
-.. cfgcmd:: set vpp settings interface <interface-name>
-
-Some network interface cards (NICs) may not be compatible with the DPDK driver.
-
-DPDK interface options
-----------------------
-
-This section shows how to configures DPDK-specific settings for an interface.
-
-.. cfgcmd:: set vpp settings interface <interface-name> num-rx-queues <value>
-
-Specifies the number of receive queues for the interface. More queues
-improve performance on multi-core systems by allowing parallel
-processing of incoming packets. Each queue is assigned to a separate
-CPU core.
-
-.. cfgcmd:: set vpp settings interface <interface-name> num-tx-queues <value>
-
-Specifies the number of transmit queues for the interface. Similar to
-receive queues, more transmit queues improve performance by enabling
-parallel processing of outgoing packets. By default, the VPP Dataplane
-has one TX queue per enabled CPU worker, or a single queue if no
-workers are configured.
-
-.. seealso:: :doc:`cpu`
-
-.. cfgcmd:: set vpp settings interface <interface-name> num-rx-desc <value>
-
-Defines the size of each receive queue. Larger queue sizes accommodate
-bursts of incoming traffic and reduce the likelihood of packet drops
-during high traffic periods.
-
-.. cfgcmd:: set vpp settings interface <interface-name> num-tx-desc <value>
-
-Defines the size of each transmit queue. Larger sizes help manage
-bursts of outgoing traffic more effectively.
-
-Global Interface Parameters
-===========================
-
-.. _vpp_config_dataplane_interface_rx_mode:
-
-interface-rx-mode
------------------
-
-The ``interface-rx-mode`` parameter defines how VPP handles incoming
-packets on interfaces. There are several modes available, each with its
-own advantages and use cases:
-
-- ``interrupt``: In this mode, VPP relies on hardware interrupts to
-  notify it of incoming packets. This mode suits low to moderate
-  traffic loads and reduces CPU usage during idle periods. It is not
-  recommended for low-latency processing. Some NICs may not support
-  this mode.
-- ``polling``: In polling mode, VPP continuously checks the interface
-  for incoming packets. This mode is ideal for high-throughput
-  scenarios where low latency is critical, as it minimizes packet
-  waiting time. However, it can increase CPU usage, especially during
-  low traffic periods, as the polling process is always active.
-- ``adaptive``: Adaptive mode combines the benefits of interrupt and
-  polling modes. VPP starts in interrupt mode and switches to polling
-  mode when traffic load increases.
-
-.. cfgcmd:: set vpp settings interface-rx-mode <mode>
-
-Choose an rx-mode based on expected traffic patterns and performance
-requirements of your network.
-
-Potential Issues and Troubleshooting
-====================================
-
-Improper interface configuration can lead to issues such as:
-
-- Failure to initialize the interface
-- Poor performance due to suboptimal driver selection or settings
-
-Indicators of such issues are:
-
-- Failed commits after adding or modifying an interface settings
-- Low throughput or high latency on the interface