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doc/guides/bbdevs/null.rst
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Thomas Monjalon
doc: adjust heading underline lengths
17 июл 2026, 16:37
17 июл 2026, 16:37
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.. SPDX-License-Identifier: BSD-3-Clause Copyright(c) 2017 Intel Corporation BBDEV null Poll Mode Driver =========================== The (**baseband_null**) is a bbdev poll mode driver which provides a minimal implementation of a software bbdev device. As a null device it does not modify the data in the mbuf on which the bbdev operation is to operate and it only works for operation type ``RTE_BBDEV_OP_NONE``. When a burst of mbufs is submitted to a *bbdev null PMD* for processing then each mbuf in the burst will be enqueued in an internal buffer ring to be collected on a dequeue call. Limitations ----------- * In-place operations for Turbo encode and decode are not supported Installation ------------ The *bbdev null PMD* is enabled and built by default in both the Linux and FreeBSD builds. Initialization -------------- To use the PMD in an application, user must: - Call ``rte_vdev_init("baseband_null")`` within the application. - Use ``--vdev="baseband_null"`` in the EAL options, which will call ``rte_vdev_init()`` internally. The following parameters (all optional) can be provided in the previous two calls: * ``socket_id``: Specify the socket where the memory for the device is going to be allocated (by default, *socket_id* will be the socket where the core that is creating the PMD is running on). * ``max_nb_queues``: Specify the maximum number of queues in the device (default is ``RTE_MAX_LCORE``). Example: ~~~~~~~~ .. code-block:: console ./test-bbdev.py -e="--vdev=baseband_null,socket_id=0,max_nb_queues=8"